CN110792420B - Online preparation and leakage stoppage process for repairing lost circulation gas well - Google Patents
Online preparation and leakage stoppage process for repairing lost circulation gas well Download PDFInfo
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- CN110792420B CN110792420B CN201911041752.1A CN201911041752A CN110792420B CN 110792420 B CN110792420 B CN 110792420B CN 201911041752 A CN201911041752 A CN 201911041752A CN 110792420 B CN110792420 B CN 110792420B
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- guanidine gum
- plugging agent
- fracturing
- liquid
- gum base
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- 238000002360 preparation method Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 title claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 228
- 239000007788 liquid Substances 0.000 claims abstract description 186
- 239000002245 particle Substances 0.000 claims abstract description 92
- 239000000835 fiber Substances 0.000 claims abstract description 70
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 488
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 244
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 244
- 235000015110 jellies Nutrition 0.000 claims description 73
- 239000008274 jelly Substances 0.000 claims description 73
- 239000003431 cross linking reagent Substances 0.000 claims description 36
- 238000005086 pumping Methods 0.000 claims description 36
- 239000012530 fluid Substances 0.000 claims description 29
- 239000000843 powder Substances 0.000 claims description 25
- 239000000243 solution Substances 0.000 claims description 24
- 238000006073 displacement reaction Methods 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 19
- 239000000499 gel Substances 0.000 claims description 16
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 12
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 9
- 239000011707 mineral Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 6
- JDXXTKLHHZMVIO-UHFFFAOYSA-N 2-(3-hydroxypropyl)guanidine Chemical compound NC(=N)NCCCO JDXXTKLHHZMVIO-UHFFFAOYSA-N 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 6
- -1 borate ions Chemical class 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 6
- 238000006731 degradation reaction Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical group O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 5
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 5
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims description 5
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 4
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 230000000379 polymerizing effect Effects 0.000 claims description 3
- 229920005862 polyol Polymers 0.000 claims description 3
- 150000003077 polyols Chemical class 0.000 claims description 3
- 150000007519 polyprotic acids Polymers 0.000 claims description 3
- 150000005846 sugar alcohols Polymers 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 13
- 238000009826 distribution Methods 0.000 abstract description 12
- 239000002002 slurry Substances 0.000 abstract description 12
- 230000008520 organization Effects 0.000 abstract description 6
- 238000001556 precipitation Methods 0.000 abstract description 6
- 239000004576 sand Substances 0.000 abstract 1
- 229920002907 Guar gum Polymers 0.000 description 12
- 239000000665 guar gum Substances 0.000 description 12
- 229960002154 guar gum Drugs 0.000 description 12
- 235000010417 guar gum Nutrition 0.000 description 12
- 239000011259 mixed solution Substances 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002981 blocking agent Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 229920013818 hydroxypropyl guar gum Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000012258 stirred mixture Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention belongs to the technical field of oil and gas field development, and particularly provides an online leak stopping preparation process for a lost circulation gas well, which comprises a fracturing pump truck, a fracturing sand mixer truck, a fracturing instrument truck and a liquid distribution tank, wherein new equipment is not required to be added, and the leak stopping and well killing construction organization is convenient; according to the leakage gas well workover online preparation plugging process, different types of plugging agents can be added online, plugging slurry is prepared and injected into a shaft at the same time, precipitation or layering of the particle type or fiber type plugging agent in a preparation tank after preparation is avoided, and the problems that expansion type temporary plugging agents swell and enlarge fracturing pump trucks and are difficult to pump after absorbing water are solved.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development, and particularly relates to an online preparation and leakage stoppage process for repairing a leakage gas well.
Background
The plugging and killing slurry for repairing the well is usually prepared from degradable plugging materials with different types and different particle sizes into a mixed solution, so that the leakage cracks with different sizes in a production layer are temporarily plugged, and the leakage of the repairing liquid in a shaft to the stratum is prevented. At present, a fluid preparation tank on a well repairing operation site does not have a stirring function, and can only be used as a storage tank for clear water or glue solution, so that the problems of rapid sedimentation of degradable plugging particles in the fluid preparation tank, easy layering of a degradable fiber plugging agent in the fluid preparation tank, difficult pump injection due to expansion and enlargement of an expansion type temporary plugging agent after water absorption and the like exist, and the problems of large preparation difficulty, long uninterrupted circulation time after fluid preparation and the like exist in the case of multi-type and multi-particle-diameter plugging kill-job fluid.
In order to improve the preparation efficiency of the plugging slurry during workover and kill-job, an online preparation and plugging process for the lost-circulation gas well is developed, different types of plugging agents can be added online, the well workover and plugging slurry is prepared and injected into a shaft, the phenomenon that the plugging agents are precipitated or layered in a liquid preparation tank after being prepared is avoided as much as possible, the circulation time after the plugging agents are prepared in the field of workover is reduced to the maximum extent, and the construction efficiency and the plugging success rate of the plugging and kill-job are improved.
Disclosure of Invention
The invention provides an online preparation and plugging process for a repair well of a lost gas well, aiming at overcoming the problems that in the prior art, a liquid preparation tank on a repair operation site has no stirring function and can only be used as a storage tank for clear water or glue solution, degradable plugging particles are quickly settled in the liquid preparation tank, a degradable fiber plugging agent is easily layered in the liquid preparation tank, and an expansion type temporary plugging agent expands after absorbing water to increase the pumping difficulty; the second purpose is to overcome the problems of large preparation difficulty and long uninterrupted circulation time after liquid preparation in the prior art when various and multi-particle-size plugging and killing liquids are used.
Therefore, the invention provides an online preparation and leakage stoppage process for repairing a leakage gas well, which comprises the following steps:
1) stirring and mixing the guanidine gum dry powder and clear water to form a guanidine gum base solution, and storing the prepared guanidine gum base solution in a liquid preparation tank; the weight ratio of the guanidine gum dry powder to the clear water is 0.3 to 1-0.7 to 1;
2) at normal temperature, circulating the guanidine gum base liquid in the liquid preparation tank in the step 1) by the fracturing pump truck until the guanidine gum base liquid is uniformly mixed;
3) the fracturing blender truck sucks the well circulated guanidine gum base liquid in the liquid preparation tank in the step 2), and simultaneously adds a guanidine gum base liquid cross-linking agent on line, and the fracturing blender truck stirs the sucked guanidine gum base liquid and the added guanidine gum base liquid cross-linking agent until guanidine gum gel is formed;
4) preparing the required amount of the guanidine gum jelly in the step 3), adding the particle type temporary plugging agent into the guanidine gum jelly, uniformly stirring, supplying the uniformly stirred mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly to a fracturing pump truck by using a fracturing blender truck, pumping the mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly into a shaft needing plugging by using the fracturing pump truck until the mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly is completely pumped into the shaft needing plugging; the weight ratio of the granular temporary plugging agent to the guanidine gum jelly is 5 to 1-20 to 1;
5) after the step 4), the fracturing blender truck repeats the step 3) to prepare the needed guanidine gum, an expansion type temporary plugging agent is added into the prepared guanidine gum and is uniformly stirred, the uniformly stirred expansion type temporary plugging agent and guanidine gum mixed liquid is supplied to a fracturing pump truck, and the fracturing pump truck pumps the expansion type temporary plugging agent and guanidine gum mixed liquid into the shaft in the step 4) until the expansion type temporary plugging agent and guanidine gum mixed liquid is completely pumped into the shaft in the step 4); the weight ratio of the expansion type temporary plugging agent to the guanidine jelly is 0.3%:1 to 2% of 1;
6) after the step 5) is finished, the fracturing blender truck absorbs the well-circulated guanidine gum base fluid required to be prepared in the fluid preparation tank in the step 2), then the fiber plugging agent is added into the absorbed guanidine gum base fluid and is uniformly stirred, and the fracturing blender truck supplies the uniformly-stirred mixed liquid of the fiber plugging agent and the guanidine gum base fluid to the fracturing pump truck until the fracturing pump truck pumps the mixed liquid of the fiber plugging agent and the guanidine gum base fluid into the well shaft in the step 5); the weight ratio of the fiber plugging agent to the guanidine gum base fluid is 0.3%:1 to 2% of 1;
7) and 6) after the step 6), the fracturing blender truck absorbs clear water in the liquid preparation tank, the fracturing blender truck supplies the absorbed clear water to the fracturing pump truck, the pump is stopped until the clear water amount meets the design requirement of the leaking stoppage well killing, and the leaking stoppage process is finished.
The guanidine gum dry powder in the step 1) is hydroxypropyl guanidine gum dry powder for oil field fracturing.
The guanidine gum base solution crosslinking agent in the step 1) takes organic boron as a main body, and hydroxyl can be chemically crosslinked with borate ions to form guanidine gum.
The standard of the guanidine gum jelly in the step 3) is that a glass rod is used for hanging, and the guanidine gum jelly cannot sink to the bottom within 5min after a particle type temporary plugging agent or an expansion type temporary plugging agent is added.
The particle type temporary plugging agent in the step 4) is characterized in that: the particle size is 3-5 mm, 1-2 mm and 40-60 meshes, the acid dissolution rate is more than 95%, the particle type temporary plugging agent is acid soluble mineral particles, the particle size of the acid soluble mineral particles is 5mm, and the acid soluble mineral particles are calcium carbonate particles.
The intumescent temporary plugging agent in the step 5) is a polymer formed by polymerizing water-soluble polyol and water-soluble polyacid at high temperature and under the action of a catalyst, wherein the high temperature range is 50-80 ℃, and the catalyst is an oxide of a transition element; the expansion type temporary plugging agent is characterized in that: the particle size is 3-5 mm, 1-2 mm and 40-60 meshes, the temperature resistance is 100-120 ℃, the degradation rate is more than 95%, and the expansion multiple is 5-7 times; the water-soluble polyalcohol is polyvinyl alcohol, the water-soluble polybasic acid is acrylic acid, and the oxide of the transition element is chromium oxide Cr2O3Or nickel oxide NiO.
The fiber plugging agent of the step 6) is characterized in that: the average molecular weight is 80000-120000, the temperature resistance is 90-110 ℃, the length is 6-10 mm, the diameter is 20Am, and the fiber plugging agent is polyvinyl alcohol fiber.
And the pump valve box of the fracturing pump truck is a ball type pump valve box.
And 2) circulating the guanidine gum base liquid in the liquid preparation tank in the step 1) by the fracturing pump truck for 20-60 minutes at normal temperature.
And when the guanidine gum base liquid crosslinking agent is added in the step 3) on line, the addition speed of the guanidine gum base liquid crosslinking agent is carried out according to the addition of 0.3-0.4% of the injection displacement of the guanidine gum gel pump.
The invention has the beneficial effects that: the invention provides an on-line preparation and leakage stoppage process for repairing a lost circulation gas well,
it includes the following equipment: the fracturing pump truck is respectively connected with the liquid distribution tank and the fracturing blender truck, and the fracturing blender truck and the fracturing pump truck are respectively connected with the fracturing blender truck; the equipment consists of a fracturing pump truck, a fracturing blender truck, a fracturing instrument truck and a liquid distribution tank, no new equipment is needed, and the plugging and killing construction organization is convenient;
different types of plugging agents can be added on line, plugging slurry is prepared and injected into a shaft at the same time, precipitation or layering of the particle type temporary plugging agent or the fiber plugging agent in a liquid preparation tank after preparation is avoided, the problems that expansion of the expansion type temporary plugging agent is increased after water absorption, the fracturing pump truck is difficult to pump and the like are solved, the circulation time after the plugging agent is prepared in a well repairing operation site is reduced to the maximum extent, and the construction efficiency and the plugging success rate of the plugging and killing operation are improved.
Detailed Description
Example 1:
an on-line preparation and leakage stoppage process for repairing a lost circulation gas well comprises the following equipment: the fracturing pump truck is respectively connected with the liquid distribution tank and the fracturing blender truck, and the fracturing blender truck and the fracturing pump truck are respectively connected with the fracturing blender truck;
the online preparation and plugging process for repairing the lost circulation gas well comprises the following steps:
1) stirring and mixing the guanidine gum dry powder and clear water to form a guanidine gum base solution, and storing the prepared guanidine gum base solution in a liquid preparation tank; the weight ratio of the guanidine gum dry powder to the clear water is 0.3 to 1-0.7 to 1;
2) at normal temperature, circulating the guanidine gum base liquid in the liquid preparation tank in the step 1) by the fracturing pump truck until the guanidine gum base liquid is uniformly mixed;
3) the fracturing blender truck sucks the well circulated guanidine gum base liquid in the liquid preparation tank in the step 2), and simultaneously adds a guanidine gum base liquid cross-linking agent on line, and the fracturing blender truck stirs the sucked guanidine gum base liquid and the added guanidine gum base liquid cross-linking agent until guanidine gum gel is formed;
4) preparing the required amount of the guanidine gum jelly in the step 3), adding the particle type temporary plugging agent into the guanidine gum jelly, uniformly stirring, supplying the uniformly stirred mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly to a fracturing pump truck by using a fracturing blender truck, pumping the mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly into a shaft needing plugging by using the fracturing pump truck until the mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly is completely pumped into the shaft needing plugging; the weight ratio of the granular temporary plugging agent to the guanidine gum jelly is 5 to 1-20 to 1;
5) after the step 4), the fracturing blender truck repeats the step 3) to prepare the needed guanidine gum, an expansion type temporary plugging agent is added into the prepared guanidine gum and is uniformly stirred, the uniformly stirred expansion type temporary plugging agent and guanidine gum mixed liquid is supplied to a fracturing pump truck, and the fracturing pump truck pumps the expansion type temporary plugging agent and guanidine gum mixed liquid into the shaft in the step 4) until the expansion type temporary plugging agent and guanidine gum mixed liquid is completely pumped into the shaft in the step 4); the weight ratio of the expansion type temporary plugging agent to the guanidine jelly is 0.3%:1 to 2% of 1;
6) after the step 5) is finished, the fracturing blender truck absorbs the well-circulated guanidine gum base fluid required to be prepared in the fluid preparation tank in the step 2), then the fiber plugging agent is added into the absorbed guanidine gum base fluid and is uniformly stirred, and the fracturing blender truck supplies the uniformly-stirred mixed liquid of the fiber plugging agent and the guanidine gum base fluid to the fracturing pump truck until the fracturing pump truck pumps the mixed liquid of the fiber plugging agent and the guanidine gum base fluid into the well shaft in the step 5); the weight ratio of the fiber plugging agent to the guanidine gum base fluid is 0.3%:1 to 2% of 1;
7) and 6) after the step 6), the fracturing blender truck absorbs clear water in the liquid preparation tank, the fracturing blender truck supplies the absorbed clear water to the fracturing pump truck, the pump is stopped until the clear water amount meets the design requirement of the leaking stoppage well killing, and the leaking stoppage process is finished.
The granular temporary plugging agent, the fiber plugging agent and the expansion type temporary plugging agent do not generate chemical reaction and precipitate in simulated formation water, wherein the simulated formation water is distilled water, 3.5 percent of NaCl and 0.3 percent of CaCl2+0.2％MgCl2。
The invention provides an on-line preparation and plugging process for repairing a lost-circulation gas well, which comprises the following equipment: the fracturing pump truck is respectively connected with the liquid distribution tank and the fracturing blender truck, and the fracturing blender truck and the fracturing pump truck are respectively connected with the fracturing blender truck; the equipment consists of a fracturing pump truck, a fracturing blender truck, a fracturing instrument truck and a liquid distribution tank, no new equipment is needed, and the plugging and killing construction organization is convenient; different types of plugging agents can be added on line, plugging slurry is prepared and injected into a shaft at the same time, precipitation or layering of the particle type temporary plugging agent or the fiber plugging agent in a liquid preparation tank after preparation is avoided, the problems that expansion of the expansion type temporary plugging agent is increased after water absorption, the fracturing pump truck is difficult to pump and the like are solved, the circulation time after the plugging agent is prepared in a well repairing operation site is reduced to the maximum extent, and the construction efficiency and the plugging success rate of the plugging and killing operation are improved.
The guanidine gum dry powder in the step 1) is hydroxypropyl guanidine gum dry powder for oil field fracturing. Firstly, the guar gum base fluid prepared by using the hydroxypropyl guar gum dry powder can ensure that the fiber plugging agent is uniformly dispersed, and is beneficial to pumping the fracturing pump truck into a shaft; secondly, the guar gum jelly formed by adding the cross-linking agent into the guar gum base liquid prepared from the hydroxypropyl guar gum dry powder has good suspension property, portability and shearing resistance, and the particle type temporary plugging agent and the expansion type temporary plugging agent with different particle diameters can be suspended in the guar gum jelly, so that the particle type temporary plugging agent and the expansion type temporary plugging agent are prevented from sinking in a stirring tank of a fracturing blender truck, and the plugging agent can be pumped into a shaft to enter a leakage well section.
The guanidine gum base solution crosslinking agent in the step 1) takes organic boron as a main body, and hydroxyl can be chemically crosslinked with borate ions to form guanidine gum. The guanidine gum base fluid crosslinking agent can form guanidine gum jelly with better viscoelasticity with guanidine gum base fluid.
The standard of the guanidine gum jelly in the step 3) is that a glass rod is used for hanging, and the guanidine gum jelly cannot sink to the bottom within 5min after a particle type temporary plugging agent or an expansion type temporary plugging agent is added. The guanidine gum jelly has good suspension property, portability and shearing resistance, and the granular temporary plugging agent and the expansive type temporary plugging agent with different grain diameters can be suspended in the guanidine gum jelly, so that the granular temporary plugging agent and the expansive type temporary plugging agent are prevented from sinking in a stirring tank of a fracturing blender truck, and the plugging agent can be pumped into a shaft to enter a leakage well section.
The particle type temporary plugging agent in the step 4) is characterized in that: the particle size is 3-5 mm, 1-2 mm and 40-60 meshes, the acid dissolution rate is more than 95%, the particle type temporary plugging agent is acid soluble mineral particles, the particle size of the acid soluble mineral particles is 5mm, and the acid soluble mineral particles are calcium carbonate particles. The reservoir can be better protected and blocked.
The intumescent temporary plugging agent in the step 5) is a polymer formed by polymerizing water-soluble polyol and water-soluble polyacid at high temperature and under the action of a catalyst, wherein the high temperature range is 50-80 ℃, and the catalyst is an oxide of a transition element; the expansion type temporary plugging agent is characterized in that: the particle size is 3-5 mm, 1-2 mm and 40-60 meshes, the temperature resistance is 100-120 ℃, the degradation rate is more than 95%, and the expansion multiple is 5-7 times; the water-soluble polyalcohol is polyvinyl alcohol, the water-soluble polybasic acid is acrylic acid, and the oxide of the transition element is chromium oxide Cr2O3Or nickel oxide NiO.
The fiber plugging agent of the step 6) is characterized in that: the average molecular weight is 80000-120000, the temperature resistance is 90-110 ℃, the length is 6-10 mm, the diameter is 20Am, and the fiber plugging agent is polyvinyl alcohol fiber. The fiber plugging agent has good dispersibility in the guanidine gum base solution, and is non-toxic and harmless to people and environment. The fiber plugging agent is mixed with the guanidine gum base liquid, so that the problem that the fiber plugging agent is difficult to separate in the guanidine gum jelly is solved, and the problem that the fiber plugging agent is difficult to pump by a pump truck after being mixed with the particle temporary plugging agent and the expansion type plugging agent is solved.
And the pump valve box of the fracturing pump truck is a ball type pump valve box. The granular temporary plugging agent, the expansion type temporary plugging agent and the fiber plugging agent can be pumped and injected.
And 2) circulating the guanidine gum base liquid in the liquid preparation tank in the step 1) by the fracturing pump truck for 20-60 minutes at normal temperature. The guanidine gum base liquid in the fracturing pump truck circulating liquid preparation tank at normal temperature for 20-60 minutes has the following advantages: 1. circulation can ensure that the dry guar gum powder can be fully dissolved in clear water, and the viscosity of the prepared base guar gum solution is more than or equal to 30 mpa.s; 2. the prepared guar gum base liquid can be ensured to be uniform in circulation and consistent in viscosity, and the viscosity difference caused by different addition speeds of the guar gum dry powder is avoided.
And when the guanidine gum base liquid crosslinking agent is added in the step 3) on line, the addition speed of the guanidine gum base liquid crosslinking agent is carried out according to the addition of 0.3-0.4% of the injection displacement of the guanidine gum gel pump. Can form guanidine jelly with better viscoelasticity.
Example 2:
250kg of dry guar gum powder and 50m3Stirring and mixing with clear water to form 0.5 percent guanidine gum base solution with the thickness of 50m3And 50m of prepared guanidine gum base liquid3Is stored at 50m3Preparing liquid in the liquid tank; the guanidine gum dry powder in the step 1) is hydroxypropyl guanidine gum dry powder for oil field fracturing; the guanidine gum base liquid crosslinking agent in the step 1) takes organic boron as a main body, and hydroxyl can be chemically crosslinked with borate ions to form guanidine gum; the formed guanidine jelly has good viscoelasticity.
2) At normal temperature, circulating the guanidine gum base solution in the liquid preparation tank in the step 1) for 60 minutes by using a fracturing pump truck; and the pump valve box of the fracturing pump truck is a ball type pump valve box.
3) The fracturing blender truck sucks the well circulated guanidine gum base liquid in the liquid preparation tank in the step 2), and simultaneously adds a guanidine gum base liquid cross-linking agent on line, and the fracturing blender truck stirs the sucked guanidine gum base liquid and the added guanidine gum base liquid cross-linking agent until guanidine gum gel is formed; the standard of the guanidine gum jelly in the step 3) is that a glass rod is used for hanging, and the guanidine gum jelly cannot sink to the bottom within 5min after a particle type temporary plugging agent or an expansion type temporary plugging agent is added; when the guanidine gum base liquid crosslinking agent is added on line in the step 3), the adding speed of the guanidine gum base liquid crosslinking agent is carried out according to the adding amount of 0.3% of the pumping capacity of the guanidine gum jelly (namely when the pumping capacity of the guanidine gum jelly is 800L/min, the adding speed of the guanidine gum base liquid crosslinking agent is 2.4L/min);
4) preparation of 20m3Adding a particle type temporary plugging agent into the guanidine gum jelly obtained in the step 3) and ensuring that the concentration of the particle type temporary plugging agent is 10% (namely 20 m)32000kg of particle type temporary plugging agent is added into the guanidine jelly glue in total), the fracturing blender truck supplies the uniformly stirred mixed liquid of the particle type temporary plugging agent and the guanidine jelly glue to the fracturing pump truck, and the fracturing pump truck supplies the particle type temporary plugging agent and the guanidine jelly to the fracturing pump truckPumping the mixed liquid of the gel into a shaft to be blocked until the mixed liquid of the granular temporary plugging agent and the guanidine gel is 20m3Pumping all the materials into a well bore needing plugging; the particle type temporary plugging agent in the step 4) is characterized in that: the particle size is 5mm, 2mm and 60 meshes, the acid dissolution rate is more than 95 percent, and the granular temporary plugging agent is calcium carbonate granules. When the particle type temporary plugging agent and the guanidine gum mixed liquid are pumped into the pump, the average pumping displacement is 800L/min, and the specific pumping displacement is increased or reduced according to the high or low wellbore pressure when the particle type temporary plugging agent and the guanidine gum mixed liquid are pumped into the pump.
5) After the step 4), repeating the step 3) to prepare the required 20m by the fracturing blender truck3The expansion type temporary plugging agent is added into the prepared guanidine gel and the concentration of the expansion type temporary plugging agent is ensured to be 2 percent (namely 20 m)3Adding 400kg of expansive type temporary plugging agent in the guanidine gum in total), supplying the uniformly stirred mixture of the expansive type temporary plugging agent and the guanidine gum to a fracturing pump truck by using a fracturing blender truck, and pumping the mixture of the expansive type temporary plugging agent and the guanidine gum into the shaft in the step 4) by using the fracturing pump truck until the mixture of the expansive type temporary plugging agent and the guanidine gum is completely pumped into the shaft in the step 4); the expanded temporary plugging agent in the step 5) is prepared by mixing polyvinyl alcohol and acrylic acid at 50 ℃ and chromium oxide Cr2O3Under the action of (a), said intumescent temporary plugging agent being characterized in that: the grain size is 3mm, 1mm and 40 meshes, the temperature resistance is 100 ℃, the degradation rate is more than 95 percent, and the expansion ratio is 5 times; when the expansion type temporary plugging agent and the guanidine gum jelly are pumped, the average pumping displacement is 600L/min, and the specific pumping displacement is that the injection displacement is increased or reduced according to the high or low wellbore pressure when the particle type temporary plugging agent and the guanidine gum jelly mixed liquid are pumped;
6) after the step 5), the fracturing blender truck sucks 10m3Step 2) preparing the circulating guanidine gum base liquid in the liquid tank, and then adding the fiber plugging agent into the sucked guanidine gum base liquid until the concentration of the fiber plugging agent is 2 percent (namely 10 m)3200kg of fiber plugging agent is added into the guanidine gum base liquid), the uniformly stirred mixed liquid of the fiber plugging agent and the guanidine gum base liquid is supplied to a fracturing pump truck by a fracturing blender truck until 10m is delivered to the fracturing pump truck3Pumping the mixed solution of the fiber plugging agent and the guanidine gum base fluid into the well in the step 5)Inside the cylinder; when the fiber plugging agent and the guanidine gum base liquid are pumped, the average pumping discharge capacity is 500L/min, and the specific pumping discharge capacity is increased or decreased according to the high or low wellbore pressure when the fiber plugging agent and the guanidine gum base liquid mixed liquid are pumped; the fiber plugging agent is characterized in that: the average molecular weight is 80000, the temperature resistance is 90 ℃, the length is 6mm, the diameter is 20Am, and the fiber plugging agent is polyvinyl alcohol fiber.
7) After the step 6), the fracturing blender truck sucks clear water in the liquid preparation tank, the fracturing blender truck supplies the sucked clear water to the fracturing pump truck, and the pump is filled for 50m3And (4) stopping the pump after the plugging slurry in the shaft is completely replaced into the stratum by clean water. And (4) observing the pressure reduction condition of the shaft from the fracturing instrument truck after the pump is stopped, if the pressure slowly reduces after the pump is stopped, indicating that the plugging and well killing operation is successful, and filling clear water into the shaft to perform subsequent well repairing operation.
The invention provides an on-line preparation and plugging process for repairing a lost-circulation gas well, which comprises the following equipment: the fracturing pump truck is respectively connected with the liquid distribution tank and the fracturing blender truck, and the fracturing blender truck and the fracturing pump truck are respectively connected with the fracturing blender truck; the equipment consists of a fracturing pump truck, a fracturing blender truck, a fracturing instrument truck and a liquid distribution tank, no new equipment is needed, and the plugging and killing construction organization is convenient; different types of plugging agents can be added on line, plugging slurry is prepared and injected into a shaft, precipitation or layering of the particle type temporary plugging agent or the fiber plugging agent in a liquid preparation tank after preparation is avoided, the problems that expansion of the expansion type temporary plugging agent is increased after water absorption, the fracturing pump truck is difficult to pump and the like are solved, the circulation time after the plugging agent is prepared in a well repairing operation site is reduced by 50%, and the construction efficiency and the plugging success rate of plugging killing operation are improved.
Example 3:
200kg of guar gum dry powder and 40m3Stirring and mixing with clear water to form 0.5 percent guanidine gum base solution of 40m3And mixing the prepared guar gum base liquid by 40m3Is stored at 40m3Preparing liquid in the liquid tank; the guanidine gum dry powder in the step 1) is hydroxypropyl guanidine gum dry powder for oil field fracturing; the guanidine gum base liquid crosslinking agent in the step 1) takes organic boron as a main body, and hydroxyl can be chemically crosslinked with borate ions to form guanidine gum; formed ofThe guanidine jelly has good viscoelasticity.
2) At normal temperature, circulating the guanidine gum base solution in the liquid preparation tank in the step 1) for 60 minutes by using a fracturing pump truck; and the pump valve box of the fracturing pump truck is a ball type pump valve box.
3) The fracturing blender truck sucks the well circulated guanidine gum base liquid in the liquid preparation tank in the step 2), and simultaneously adds a guanidine gum base liquid cross-linking agent on line, and the fracturing blender truck stirs the sucked guanidine gum base liquid and the added guanidine gum base liquid cross-linking agent until guanidine gum gel is formed; the standard of the guanidine gum jelly in the step 3) is that a glass rod is used for hanging, and the guanidine gum jelly cannot sink to the bottom within 5min after a particle type temporary plugging agent or an expansion type temporary plugging agent is added; when the guanidine gum base liquid crosslinking agent is added in the step 3) on line, the adding speed of the guanidine gum base liquid crosslinking agent is carried out according to the adding amount of 0.4% of the pumping capacity of the guanidine gum jelly (namely, when the pumping capacity of the guanidine gum jelly is 1000L/min, the adding speed of the guanidine gum base liquid crosslinking agent is 4L/min);
4) preparation of 10m3Adding a particle type temporary plugging agent into the guanidine gum jelly obtained in the step 3) and ensuring that the concentration of the particle type temporary plugging agent is 5% (namely 10 m)3500kg of granular temporary plugging agent is added into the guanidine gum jelly in total), the fracturing blender truck supplies the uniformly stirred mixed liquid of the granular temporary plugging agent and the guanidine gum jelly to a fracturing pump truck, the fracturing pump truck pumps the mixed liquid of the granular temporary plugging agent and the guanidine gum jelly into a shaft needing plugging until the mixed liquid of the granular temporary plugging agent and the guanidine gum jelly is 10m3Pumping all the materials into a well bore needing plugging; the particle type temporary plugging agent in the step 4) is characterized in that: the particle size is 4mm, 1.5mm and 50 meshes, the acid solubility is more than 95 percent, and the particle type temporary plugging agent is calcium carbonate particles. When the particle type temporary plugging agent and the guanidine gum mixed liquid are pumped into the pump, the average pumping displacement is 1000L/min, and the specific pumping displacement is increased or reduced according to the high or low wellbore pressure when the particle type temporary plugging agent and the guanidine gum mixed liquid are pumped into the pump.
5) After the step 4), repeating the step 3) to prepare the required 20m by the fracturing blender truck3The guanidine gum jelly is prepared by adding an expansion type temporary plugging agent into the prepared guanidine gum jelly and ensuring that the concentration of the expansion type temporary plugging agent is 1 percent (namely 20 m)3The total addition of 200kg of expansion agent in the guanidine jellyThe fracturing temporary plugging agent) is mixed with the expansion type temporary plugging agent and the guanidine gum jelly, and the mixture is supplied to a fracturing pump truck by the fracturing blender truck, and the fracturing pump truck pumps the mixture into the shaft in the step 4) until the mixture is completely pumped into the shaft in the step 4); the expansion type temporary plugging agent in the step 5) is a polymer polymerized by polyvinyl alcohol and acrylic acid at 75 ℃ under the action of nickel oxide NiO; the expansion type temporary plugging agent is characterized in that: the grain size is 4mm, 1.5mm and 50 meshes, the material can resist 110 ℃, the degradation rate is more than 95 percent, and the expansion ratio is 6 times; when the expansion type temporary plugging agent and the guanidine gum jelly are pumped, average pumping displacement is 800L/min, and the specific pumping displacement is that the injection displacement is increased or reduced according to the high or low wellbore pressure when the particle type temporary plugging agent and the guanidine gum jelly mixed liquid are pumped;
6) after the step 5), the fracturing blender truck sucks 10m3Step 2) preparing the circulating guanidine gum base liquid in the liquid tank, and then adding the fiber plugging agent into the sucked guanidine gum base liquid until the concentration of the fiber plugging agent is 1 percent (namely 10 m)3100kg of fiber plugging agent is added into the guanidine gum base liquid), the uniformly stirred mixed liquid of the fiber plugging agent and the guanidine gum base liquid is supplied to a fracturing pump truck by a fracturing blender truck until the fracturing pump truck takes 20m3Pumping the mixed solution of the fiber plugging agent and the guanidine gum base solution into the shaft in the step 5); when the fiber plugging agent and the guanidine gum base liquid are pumped, the average pumping discharge capacity is 600L/min, and the specific pumping discharge capacity is increased or reduced according to the high or low wellbore pressure when the fiber plugging agent and the guanidine gum base liquid mixed liquid are pumped; the fiber plugging agent is characterized in that: the average molecular weight is 100000, the temperature can be resisted at 100 ℃, the length is 8mm, the diameter is 20Am, and the fiber plugging agent is polyvinyl alcohol fiber.
7) After the step 6), the fracturing blender truck sucks clear water in the liquid preparation tank, the fracturing blender truck supplies the sucked clear water to the fracturing pump truck, and the pump is filled for 50m3And (4) stopping the pump after the plugging slurry in the shaft is completely replaced into the stratum by clean water. And (4) observing the pressure reduction condition of the shaft from the fracturing instrument truck after the pump is stopped, if the pressure slowly reduces after the pump is stopped, indicating that the plugging and well killing operation is successful, and filling clear water into the shaft to perform subsequent well repairing operation.
The invention provides an on-line preparation and plugging process for repairing a lost-circulation gas well, which comprises the following equipment: the fracturing pump truck is respectively connected with the liquid distribution tank and the fracturing blender truck, and the fracturing blender truck and the fracturing pump truck are respectively connected with the fracturing blender truck; the equipment consists of a fracturing pump truck, a fracturing blender truck, a fracturing instrument truck and a liquid distribution tank, no new equipment is needed, and the plugging and killing construction organization is convenient; different types of plugging agents can be added on line, plugging slurry is prepared and injected into a shaft, precipitation or layering of the particle type temporary plugging agent or the fiber plugging agent in a liquid preparation tank after preparation is avoided, the problems that expansion of the expansion type temporary plugging agent is increased after water absorption, the fracturing pump truck is difficult to pump and the like are solved, the circulation time after the plugging agent is prepared in a well repairing operation site is reduced by 55%, and the construction efficiency and the plugging success rate of plugging killing operation are improved.
Example 4:
1) 210kg of dry guar gum powder and 70m3Stirring and mixing with clear water to form 0.3 percent guanidine gum base solution of 70m3And 70m of prepared guanidine gum base liquid3Is stored at 70m3Preparing liquid in the liquid tank; the guanidine gum dry powder in the step 1) is hydroxypropyl guanidine gum dry powder for oil field fracturing; the guanidine gum base liquid crosslinking agent in the step 1) takes organic boron as a main body, and hydroxyl can be chemically crosslinked with borate ions to form guanidine gum; the formed guanidine jelly has good viscoelasticity.
2) At normal temperature, circulating the guanidine gum base solution in the liquid preparation tank in the step 1) for 45 minutes by using a fracturing pump truck; and the pump valve box of the fracturing pump truck is a ball type pump valve box.
3) The fracturing blender truck sucks the well circulated guanidine gum base liquid in the liquid preparation tank in the step 2), and simultaneously adds a guanidine gum base liquid cross-linking agent on line, and the fracturing blender truck stirs the sucked guanidine gum base liquid and the added guanidine gum base liquid cross-linking agent until guanidine gum gel is formed; the standard of the guanidine gum jelly in the step 3) is that a glass rod is used for hanging, and the guanidine gum jelly cannot sink to the bottom within 5min after a particle type temporary plugging agent or an expansion type temporary plugging agent is added; when the guanidine gum base liquid crosslinking agent is added on line in the step 3), the adding speed of the guanidine gum base liquid crosslinking agent is carried out according to the adding amount of 0.4% of the pumping capacity of the guanidine gum jelly (namely when the pumping capacity of the guanidine gum jelly is 900L/min, the adding speed of the guanidine gum base liquid crosslinking agent is 4L/min);
4) preparation of 30m3Adding a particle type temporary plugging agent into the guanidine gum jelly obtained in the step 3) and ensuring that the concentration of the particle type temporary plugging agent is 20% (namely 30 m)36000kg of particle type temporary plugging agent is added into the guanidine gum jelly in total), the fracturing blender truck supplies the evenly stirred mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly to a fracturing pump truck, the fracturing pump truck pumps the mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly into a shaft needing plugging until the mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly is 10m3Pumping all the materials into a well bore needing plugging; the particle type temporary plugging agent in the step 4) is characterized in that: the particle size is 3mm, 1mm and 40 meshes, the acid solubility is more than 95 percent, and the particle type temporary plugging agent is calcium carbonate particles. When the particle type temporary plugging agent and the guanidine gum mixed liquid are pumped, the average pumping displacement is 900L/min, and the specific pumping displacement is increased or reduced according to the high or low wellbore pressure when the particle type temporary plugging agent and the guanidine gum mixed liquid are pumped.
5) After the step 4), repeating the step 3) to prepare the required 20m by the fracturing blender truck3The expansion type temporary plugging agent is added into the prepared guanidine gel and the concentration of the expansion type temporary plugging agent is ensured to be 0.3 percent (namely 20 m)360kg of expansion type temporary plugging agent is added in the guanidine gum gel in total), the uniformly stirred expansion type temporary plugging agent and guanidine gum gel mixed solution is supplied to a fracturing pump truck by a fracturing blender truck, and the fracturing pump truck pumps the expansion type temporary plugging agent and guanidine gum gel mixed solution into the shaft in the step 4) until the expansion type temporary plugging agent and guanidine gum gel mixed solution is completely pumped into the shaft in the step 4); the expanded temporary plugging agent in the step 5) is prepared by mixing polyvinyl alcohol and acrylic acid at 80 ℃ and chromium oxide Cr2O3Under the action of (a), said intumescent temporary plugging agent being characterized in that: the grain diameter is 5mm, 2mm and 60 meshes, the temperature is 120 ℃, the degradation rate is more than 95 percent, and the expansion ratio is 7 times. When the expansion type temporary plugging agent and the guanidine gum jelly are pumped, average pumping displacement is 700L/min, and the specific pumping displacement is that the injection displacement is increased or reduced according to the high or low wellbore pressure when the particle type temporary plugging agent and the guanidine gum jelly mixed liquid are pumped;
6) step by stepAfter the step 5), the fracturing blender truck sucks 20m3Step 2) preparing the circulating guanidine gum base liquid in the liquid tank, and then adding the fiber plugging agent into the sucked guanidine gum base liquid until the concentration of the fiber plugging agent is 0.3 percent (namely 20 m)360kg of fiber plugging agent is added into the guanidine gum base liquid), the uniformly stirred mixed liquid of the fiber plugging agent and the guanidine gum base liquid is supplied to a fracturing pump truck by a fracturing blender truck until the fracturing pump truck takes 20m3Pumping the mixed solution of the fiber plugging agent and the guanidine gum base solution into the shaft in the step 5); when the fiber plugging agent and the guanidine gum base liquid are pumped, the average pumping displacement is 550L/min, and the specific pumping displacement is that the injection displacement is increased or decreased according to the high or low wellbore pressure when the fiber plugging agent and the guanidine gum base liquid mixed liquid are pumped; the fiber plugging agent is characterized in that: the average molecular weight is 120000, the fiber blocking agent can resist 110 ℃, the length is 10mm, the diameter is 20Am, and the fiber blocking agent is polyvinyl alcohol fiber.
7) After the step 6), the fracturing blender truck sucks clear water in the liquid preparation tank, the fracturing blender truck supplies the sucked clear water to the fracturing pump truck, and the pump is filled for 50m3And (4) stopping the pump after the plugging slurry in the shaft is completely replaced into the stratum by clean water. And (4) observing the pressure reduction condition of the shaft from the fracturing instrument truck after the pump is stopped, if the pressure slowly reduces after the pump is stopped, indicating that the plugging and well killing operation is successful, and filling clear water into the shaft to perform subsequent well repairing operation.
The invention provides an on-line preparation and plugging process for repairing a lost-circulation gas well, which comprises the following equipment: the fracturing pump truck is respectively connected with the liquid distribution tank and the fracturing blender truck, and the fracturing blender truck and the fracturing pump truck are respectively connected with the fracturing blender truck; the equipment consists of a fracturing pump truck, a fracturing blender truck, a fracturing instrument truck and a liquid distribution tank, no new equipment is needed, and the plugging and killing construction organization is convenient; different types of plugging agents can be added on line, plugging slurry is prepared and injected into a shaft, precipitation or layering of the particle type temporary plugging agent or the fiber plugging agent in a liquid preparation tank after preparation is avoided, the problems that expansion of the expansion type temporary plugging agent is increased after water absorption, the fracturing pump truck is difficult to pump and the like are solved, the circulation time after the plugging agent is prepared in a well repairing operation site is reduced by 52%, and the construction efficiency and the plugging success rate of plugging killing operation are improved.
The density of the granular temporary plugging agent is 1.3-1.5 g/cm3If the density is higher than that of water, the guanidine gum base solution is in the liquid preparation tank if the guanidine gum base solution is not stirred, the particle temporary plugging agent sinks in the liquid preparation tank, and precipitates at the bottom of the tank within 2 minutes to block a water supply valve at the bottom of the liquid preparation tank, so that the fracturing blender truck cannot absorb the guanidine gum base solution; the density of the fiber plugging agent is 0.5-0.6 g/cm3The density is less than that of water, if the fiber plugging agent is not stirred, the fiber plugging agent gradually floats upwards to generate a layering phenomenon, and floats on the upper part of the liquid level in the tank within 30 minutes and cannot be sucked; the expansion type temporary plugging agent can expand by more than 5 times when absorbing water within 2 hours, the particle size of the expansion type temporary plugging agent with the particle size of 3-5 mm after absorbing water and expanding is 15-30 mm, the volume is too large after absorbing water and exceeds the particle size of the plugging agent which can be pumped by a fracturing pump truck, and the pump truck cannot pump; in conclusion, if the plugging process of on-line preparation of the workover plugging agent is not adopted, the plugging agent needs to be continuously circulated after preparation to avoid the situations, the plugging process of on-line preparation of the workover plugging agent can be adopted to carry out pump injection while being matched, so that the circulation time is saved, and the construction efficiency and the success rate of plugging and killing operations are improved.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. An online preparation and leakage stoppage process for repairing a lost circulation gas well is characterized by comprising the following steps: the method comprises the following steps:
1) stirring and mixing the guanidine gum dry powder and clear water to form a guanidine gum base solution, and storing the prepared guanidine gum base solution in a liquid preparation tank; the weight ratio of the guanidine gum dry powder to the clear water is 0.3 to 1-0.7 to 1;
2) at normal temperature, circulating the guanidine gum base liquid in the liquid preparation tank in the step 1) by the fracturing pump truck until the guanidine gum base liquid is uniformly mixed;
3) the fracturing blender truck sucks the well circulated guanidine gum base liquid in the liquid preparation tank in the step 2), and simultaneously, online adding a guanidine gum base liquid cross-linking agent, and the fracturing blender truck stirs the sucked guanidine gum base liquid and the added guanidine gum base liquid cross-linking agent until guanidine gum jelly is formed; the weight ratio of the guanidine gum base fluid crosslinking agent to the guanidine gum base fluid is 0.3 to 1-0.4 to 1;
4) preparing the required amount of the guanidine gum jelly in the step 3), adding the particle type temporary plugging agent into the guanidine gum jelly, uniformly stirring, supplying the uniformly stirred mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly to a fracturing pump truck by using a fracturing blender truck, pumping the mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly into a shaft needing plugging by using the fracturing pump truck until the mixed liquid of the particle type temporary plugging agent and the guanidine gum jelly is completely pumped into the shaft needing plugging; the weight ratio of the granular temporary plugging agent to the guanidine gum jelly is 5 to 1-20 to 1; the granular temporary plugging agent is characterized in that: the particle size is 3-5 mm, 1-2 mm and 40-60 meshes;
5) after the step 4), the fracturing blender truck repeats the step 3) to prepare the needed guanidine gum, an expansion type temporary plugging agent is added into the prepared guanidine gum and is uniformly stirred, the uniformly stirred expansion type temporary plugging agent and guanidine gum mixed liquid is supplied to a fracturing pump truck, and the fracturing pump truck pumps the expansion type temporary plugging agent and guanidine gum mixed liquid into the shaft in the step 4) until the expansion type temporary plugging agent and guanidine gum mixed liquid is completely pumped into the shaft in the step 4); the weight ratio of the expansion type temporary plugging agent to the guanidine jelly is 0.3%:1 to 2% of 1; the expansion type temporary plugging agent is characterized in that: the particle size is 3-5 mm, 1-2 mm and 40-60 meshes;
6) after the step 5) is finished, the fracturing blender truck absorbs the circulating guanidine gum base fluid in the fluid preparation tank in the step 2), then the fiber plugging agent is added into the absorbed guanidine gum base fluid and is uniformly stirred, and the fracturing blender truck supplies the uniformly stirred mixed liquid of the fiber plugging agent and the guanidine gum base fluid to the fracturing pump truck until the fracturing pump truck pumps the mixed liquid of the fiber plugging agent and the guanidine gum base fluid into the shaft in the step 5); the weight ratio of the fiber plugging agent to the guanidine gum base fluid is 0.3%:1 to 2% of 1; the fiber plugging agent is characterized in that: the average molecular weight is 80000-120000, the temperature resistance is 90-110 ℃, the length is 6-10 mm, and the diameter is 20 Am;
7) and 6) after the step 6), the fracturing blender truck absorbs clear water in the liquid preparation tank, the fracturing blender truck supplies the absorbed clear water to the fracturing pump truck, the pump is stopped until the clear water amount meets the design requirement of the leaking stoppage well killing, and the leaking stoppage process is finished.
2. The lost circulation gas well workover online preparation lost circulation process of claim 1, wherein: the guanidine gum dry powder in the step 1) is hydroxypropyl guanidine gum dry powder for oil field fracturing.
3. The lost circulation gas well workover online preparation lost circulation process of claim 2, wherein: the guanidine gum base solution crosslinking agent in the step 1) takes organic boron as a main body, and hydroxyl can be chemically crosslinked with borate ions to form guanidine gum.
4. The lost circulation gas well workover online preparation lost circulation process of claim 3, wherein: the standard of the guanidine gum jelly in the step 3) is that a glass rod is used for hanging, and the guanidine gum jelly cannot sink to the bottom within 5min after a particle type temporary plugging agent or an expansion type temporary plugging agent is added.
5. The lost circulation gas well workover online preparation lost circulation process of claim 4, wherein: the acid solubility of the granular temporary plugging agent in the step 4) is more than 95%, the granular temporary plugging agent is acid-soluble mineral particles, the particle size of the acid-soluble mineral particles is 5mm, and the acid-soluble mineral particles are calcium carbonate particles.
6. The lost circulation gas well workover online preparation lost circulation process of claim 5, wherein: the intumescent temporary plugging agent in the step 5) is a polymer formed by polymerizing water-soluble polyol and water-soluble polyacid at high temperature and under the action of a catalyst, wherein the high temperature range is 50-80 ℃, and the catalyst is an oxide of a transition element; the expansion type temporary plugging agent is characterized in that: the material can resist the temperature of 100-120 ℃, the degradation rate is more than 95%, and the expansion multiple is 5-7 times; the water-soluble polyalcohol is polyvinyl alcohol, the water-soluble polybasic acid is acrylic acid, and the oxide of the transition element is chromium oxide Cr2O3Or nickel oxide NiO.
7. The lost circulation gas well workover online preparation lost circulation process of claim 6, wherein: the fiber plugging agent in the step 6) is polyvinyl alcohol fiber.
8. The lost circulation gas well workover online preparation lost circulation process of claim 7, wherein: and the pump valve box of the fracturing pump truck is a ball type pump valve box.
9. The lost circulation gas well workover online preparation lost circulation process of claim 8, wherein: and 2) circulating the guanidine gum base liquid in the liquid preparation tank in the step 1) by the fracturing pump truck for 20-60 minutes at normal temperature.
10. The lost circulation gas well workover online preparation lost circulation process of claim 9, wherein: and when the guanidine gum base liquid crosslinking agent is added in the step 3) on line, the addition speed of the guanidine gum base liquid crosslinking agent is carried out according to the addition of 0.3-0.4% of the injection displacement of the guanidine gum gel pump.
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| CN201911041752.1A CN110792420B (en) | 2019-10-30 | 2019-10-30 | Online preparation and leakage stoppage process for repairing lost circulation gas well |
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