CN109777386A - A kind of selectivity low-density water shutoff agent and its preparation and construction technology - Google Patents
A kind of selectivity low-density water shutoff agent and its preparation and construction technology Download PDFInfo
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- CN109777386A CN109777386A CN201910155353.1A CN201910155353A CN109777386A CN 109777386 A CN109777386 A CN 109777386A CN 201910155353 A CN201910155353 A CN 201910155353A CN 109777386 A CN109777386 A CN 109777386A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 266
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 165
- 238000010276 construction Methods 0.000 title claims abstract description 24
- 238000005516 engineering process Methods 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 34
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 17
- -1 fatty acid esters Chemical class 0.000 claims abstract description 17
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 17
- 239000010703 silicon Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 229920001222 biopolymer Polymers 0.000 claims abstract description 16
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 16
- 229930195729 fatty acid Natural products 0.000 claims abstract description 16
- 239000000194 fatty acid Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 16
- 229920006337 unsaturated polyester resin Polymers 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims description 60
- 239000007924 injection Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229920006305 unsaturated polyester Polymers 0.000 claims 2
- 239000003921 oil Substances 0.000 abstract description 43
- 230000000694 effects Effects 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000006185 dispersion Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000000725 suspension Substances 0.000 abstract description 2
- 231100000331 toxic Toxicity 0.000 abstract description 2
- 230000002588 toxic effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 14
- 230000015572 biosynthetic process Effects 0.000 description 13
- 239000010410 layer Substances 0.000 description 13
- 239000003129 oil well Substances 0.000 description 13
- 238000012360 testing method Methods 0.000 description 13
- 238000007711 solidification Methods 0.000 description 10
- 230000008023 solidification Effects 0.000 description 10
- 239000002283 diesel fuel Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 8
- 239000010779 crude oil Substances 0.000 description 7
- 239000003292 glue Substances 0.000 description 6
- 239000002981 blocking agent Substances 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 235000020681 well water Nutrition 0.000 description 5
- 239000002349 well water Substances 0.000 description 5
- 239000010865 sewage Substances 0.000 description 4
- 239000012267 brine Substances 0.000 description 3
- 239000013043 chemical agent Substances 0.000 description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010793 Steam injection (oil industry) Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- HVCOBJNICQPDBP-UHFFFAOYSA-N 3-[3-[3,5-dihydroxy-6-methyl-4-(3,4,5-trihydroxy-6-methyloxan-2-yl)oxyoxan-2-yl]oxydecanoyloxy]decanoic acid;hydrate Chemical compound O.OC1C(OC(CC(=O)OC(CCCCCCC)CC(O)=O)CCCCCCC)OC(C)C(O)C1OC1C(O)C(O)C(O)C(C)O1 HVCOBJNICQPDBP-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000006424 Flood reaction Methods 0.000 description 1
- 229930186217 Glycolipid Natural products 0.000 description 1
- 238000010795 Steam Flooding Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HBYOLNPZXLHVQA-UHFFFAOYSA-J dicalcium dicarbonate Chemical compound [Ca+2].[Ca+2].[O-]C([O-])=O.[O-]C([O-])=O HBYOLNPZXLHVQA-UHFFFAOYSA-J 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Classifications
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- 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
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- 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
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- 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
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/845—Compositions based on water or polar solvents containing inorganic compounds
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/885—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- Materials Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Sealing Material Composition (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a kind of selective low-density water shutoff agents, in parts by weight, comprising: 100 parts of superfine light calcium carbonate powder, 5-10 parts of silicon substrate unsaturated polyester resin, 2-3 parts of polyhydric fatty acid esters, 1-2 parts of biopolymer, 15-20 parts of high-temperature concretion agent.The water shutoff agent partial size is small, good dispersion, suspension stability are strong in water, density is low, it is easy to prepare and construct, it is able to satisfy the long-time water-blocking operation construction requirement of deep-well and ultradeep well, has the effect of the not stifled oil of water blockoff, it has no toxic and side effect to human body, can be widely used for the water breakthrough between horizontal well selective water plugging, control side water, bottom water coning and reservoir.Also disclose the preparation and construction technology of the water shutoff agent, preparation is simple, can site operation, construction technology is simple, quick, has a wide range of application, economic benefit and environmental benefit are significant.
Description
Technical field
The invention belongs to technical field of oilfield chemistry, it is related to a kind of water shutoff agent and its preparation process, specifically designs one
The selective low-density water shutoff agent of kind and its preparation and construction technology.
Background technique
Well water is that oil field produces the serious problem faced, and the water of oil well output has different sources: first is that coming
Side water between reservoir；Two are derived from the bottom water of reservoir；Three are derived from reservoir water or injection water.Usually pass through water shutoff agent
To control the output of oily well water, the oil content of raising crude oil production well, reduction security risk, the purpose of crude oil production well water blockoff
It is the output of control injection water, Bian Shui or bottom water.
Research for water shutoff agent, foreign countries' starting is more early, has the history in more than 50 years so far, has developed high molecular polymerization
Object chemical water shutoff agent, water-soluble polymer frozen glue class water shutoff agent, inorganic material water shutoff agent and granulated gel water shutoff agent etc..The country exists
The research of this respect is started late, but has fast development in theory and using upper.
Be commonly divided into following two categories from technological angle water shutoff agent: one is to react the nothing for generating sedimentation type in the earth formation
Machine salt chemical agent, its closure principle are two kinds of inorganic chemistry agent solutions that insulating liquid separates to be injected with to single layer, on stratum
It forms precipitating blocking and blocks stratum duct；Another kind is based on the physical clogging with polymer gel and to have absorption concurrently and power is caught
The chemical agent of collection effect, and this structure is included in water in lattice structure and is formed with viscoelastic frozen glue body, this frozen glue
Body forms physical clogging among pore media, and water flow is prevented to pass through or change the direction of a stream of water.Water shutoff agent is according to water shutoff agent to oil
The blocking or so of layer and water layer, and non-selective water shutoff agent and selective water shutoff agent can be divided into.Non-selective water blockoff refers to blocking agent
The chemical agent of energy while reservoir plugging and water layer in oil well layer；Selective water plugging, which refers to, blocks water layer without blocking up oil reservoir, therefore only
It results in blockage and oil reservoir is influenced little in water layer.According to the form of water shutoff agent in the earth formation, five classes: frozen glue can be divided into
Type, resin type, gel-type, sedimentation type and dispersion type.
Oilfield horizontal well is to improve reserves exploitation rate, the important means of recovery ratio and single well productivity, but there are middle and high infiltrations
The problem of oil reservoir High water cut, therefore generally require to carry out water blockoff processing, water plugging of horizontal well technology is related to oil reservoir, technology, blocks up
The many aspects such as aqua, well logging and completion mode.Due to the particularity of horizontal well, operation technique is complicated, and well logging water detection data is few,
In addition the particularity of the complete well of horizontal well fracturing, both increases the difficulty of water blockoff.Water plugging of horizontal well technology is ground both at home and abroad
The serious water breakthrough problem for the bottom water, Bian Shui, injection water that commonly encounter in horizontal well, the production of deep-well oil/gas well is studied carefully, for water
The research of horizontal well chemical plugging agent is at the early-stage, due to Horizontal Well segment length, and usually with naked eye or the complete well of cutting seam sieve tube, to chemistry
The injection of blocking agent brings difficulty.The injection technology of horizontal well blocking agent still continues to use straight well operation technique at present, therefore leads to measure
Effect is poor, and water blockoff low efficiency, crude output cannot improve.
Summary of the invention
For this purpose, the present invention exactly will solve above-mentioned technical problem, thus the choosing for proposing that a kind of water blockoff is high-efficient, being easy to construct
Selecting property low-density water shutoff agent and its preparation and construction technology.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
The present invention provides a kind of selective low-density water shutoff agent, and in parts by weight, the water shutoff agent includes: superthin light carbon
100 parts of sour calcium powder, 5-10 parts of silicon substrate unsaturated polyester resin, 2-3 parts of polyhydric fatty acid esters, 1-2 parts of biopolymer, high temperature is solid
Agent 15-20 parts of knot.
Preferably, the average grain diameter of the superfine light calcium carbonate powder is not more than 15 μm, the superfine light calcium carbonate
Calcium carbonate content is not less than 95wt% in powder.
Preferably, solid content is greater than 60% in the silicon substrate unsaturated polyester resin.
Preferably, the polyhydric fatty acid esters average grain diameter is not more than 15 μm, wherein substance content is not less than 80%.
Preferably, the biopolymer average grain diameter is not more than 15 μm, viscosity is not less than 100mpa.s.
The present invention also provides a kind of techniques for preparing the selective low-density water shutoff agent comprising following steps:
S1, superfine light calcium carbonate powder and silicon substrate unsaturated polyester resin are mixed in proportion, is crushed to after drying
Required partial size；
S2, biopolymer, polyhydric fatty acid esters, high-temperature concretion agent are mixed in proportion, is crushed to required partial size；
S3, the product for obtaining step S1, S2 are uniformly mixed up to water shutoff agent.
Preferably, water shutoff agent obtained in water additional amount be not less than 10% when, liquid volume increase by 5% or more, it is close
Degree is less than 0.95g/cm3。
The present invention also provides a kind of construction technologies of selective low-density water shutoff agent comprising following steps:
S1, under stirring, by the water shutoff agent be added prepare base fluid in, obtain water shutoff agent and prepare base fluid mixing
Object, the mass percent of water shutoff agent is 5-35% in the mixture；
S2, continue stirring to required viscosity and density is reached, obtain water shutoff agent fluid system；
S3, by the water shutoff agent fluid system Injection Level well, carry out water blockoff.
Preferably, mixing speed is that 50-500 turns/min in the step S1, the addition speed of water shutoff agent is 25-
50kg/min；Mixing time is no less than 30min in the step S2.
Preferably, the apparent viscosity of the water shutoff agent fluid system is 15-50mpa.s, density is 0.75~0.95g/
cm3。
The above technical solution of the present invention has the following advantages over the prior art:
(1) selective low-density water shutoff agent of the present invention, in parts by weight, the water shutoff agent includes: superthin light
100 parts of Paris white, 5-10 parts of silicon substrate unsaturated polyester resin, 2-3 parts of polyhydric fatty acid esters, 1-2 parts of biopolymer, high temperature
15-20 parts of consolidating agent.The water shutoff agent partial size is small, good dispersion, suspension stability are strong in water, density is low, can grow at room temperature
Time keeps stablizing, and is easy to prepare and construct, when temperature is higher than 50 DEG C or more, crosslinks curing reaction, and viscosity gradually rises,
Solid is changed by liquid, blocks the generation of water breakthrough, plays the role of blocking for a long time, is able to satisfy the long-time of deep-well and ultradeep well
Water-blocking operation construction requirement, for water shutoff agent system in crude oil, silicon substrate unsaturated-resin, polyhydric fatty acid esters etc. cannot be solid with high temperature
Knot agent reacts, and keeps flow regime, will not block oil reservoir seepage channel, achievees the purpose that the not stifled oil of water blockoff.The water blockoff
Agent has no toxic and side effect to human body, and ensure that construction personnel's is healthy and safe.The water shutoff agent can be widely used for horizontal well selective blocking
Water breakthrough between water, control side water, bottom water coning and reservoir.
(2) construction technology of selective low-density water shutoff agent of the present invention by water shutoff agent and is prepared with preparation base fluid
After being mixed to prepare water shutoff agent fluid system, can site operation, construction technology is simple, quick, prepare base fluid can be selected industry water,
Stratum sewage, high-salinity brine etc., low in cost, the fluid system good fluidity, viscosity and density are low, be easy to pump note and
Indepth plugging, since the viscosity differences of well Crude Oil and water flooding are big, water shutoff agent fluid optionally enters the water in oil well
Channelling road, under the promotion of rear injection fluid, water shutoff agent fluid enters the deep in water breakthrough channel, in formation temperature greater than 50 DEG C
Under environment, water shutoff agent crosslinks reaction, and viscosity quickly improves, and forms induration, to play the effect of long-term water blockoff, this is stifled
Aqua fluid system is lower to preparation base fluid requirement, and the profile control and water plugging construction that can be widely used for the regions such as ocean, desert oil well is made
Industry and drilling leakage blockage, the low-density of the fluid system make the water shutoff agent can be widely applied to low pressure reservoir, bottom water reservoir again
Equal plug water constructions, economic benefit and environmental benefit are significant.
Detailed description of the invention
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and combines
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is to put down the production song that 44 wells are constructed to 601- using selective low-density water shutoff agent in experimental example of the present invention
Line chart；
Fig. 2 is the production song constructed using selective low-density water shutoff agent to HZ19-3-9 well in experimental example of the present invention
Line comparison diagram.
Specific embodiment
Embodiment 1
The present embodiment provides a kind of selective low-density water shutoff agents, and in parts by weight, the water shutoff agent includes: superthin light
100 parts of Paris white, 10 parts of silicon substrate unsaturated polyester resin, 3 parts of polyhydric fatty acid esters, 2 parts of biopolymer, high-temperature concretion agent
20 parts.
Wherein, the average grain diameter of the ultra fine calcium carbonate powder is not more than 15 μm, calcium carbonate in superfine light calcium carbonate powder
Content is not less than 95wt%.The silicon substrate unsaturated polyester resin can be high temperature modification silicon substrate epoxy resin, and wherein solid content is big
In 60%.The polyhydric fatty acid esters average grain diameter is not more than 15 μm, and wherein substance content is not less than 80%, the present embodiment
In, the polyhydric aliphatic acid is grease by product-glycolipid BS after biological respinse, and main component is acetylated glycolipid.It is described
Biopolymer is xc biopolymer etc., and average grain diameter is not more than 15 μm, and viscosity is not less than 100mpa.s.The hot setting
Agent is aromatic polyamine etc..
The present embodiment also provides a kind of technique for preparing the selective low-density water shutoff agent comprising following steps:
S1, superfine light calcium carbonate powder is uniformly mixed according to the above ratio with silicon substrate unsaturated polyester resin, at 100 DEG C
Required partial size is crushed to after drying (no more than 15 μm)；
S2, biopolymer, polyhydric fatty acid esters, high-temperature concretion agent are mixed in proportion, is crushed to required partial size
(being not more than 15 μm)；
S3, the product for obtaining step S1, S2 are uniformly mixed up to water shutoff agent.
Water shutoff agent obtained can make liquid volume increase by 5% or more, and make to obtain when additional amount is not less than 10% in water
Water shutoff agent and water mixture density be less than 0.95g/cm3。
The present embodiment also provides a kind of technique constructed using above-mentioned water shutoff agent, includes the following steps:
S1, under the mixing speed of 50 turns/min, the water shutoff agent is added with the charging rate of 25kg/min and prepares base
In liquid, obtains water shutoff agent and prepare the mixture of base fluid, the mass percent of water shutoff agent is 5% in the mixture, described to match
Base fluid processed can obtain aqueous based systems for industrial water, stratum sewage, high-salinity brine etc., or preparing base fluid can be with
The oily matters such as diesel oil are added on the basis of aqueous based systems, obtain oil based system, wherein the total salinity of high-salinity brine
Less than 200,000 mg/L.It is unaffected with selective low-density water shutoff agent fluid system performance using the oil well of the above liquid dosage,
Water plugging property index can meet construction operation requirement.
S2, continue to stir 30min to reach required viscosity and density up to mixture, obtain water shutoff agent fluid system, block up
The apparent viscosity of aqua fluid system is 15-50mpa.s, and density is 0.75~0.95g/cm3；When apparent viscosity is lower than
When 15mpa.s, increase the additional amount of water shutoff agent, until reaching viscosity requirement, when viscosity is higher than 50mpa.s, increases and prepare water consumption,
To viscosity requirement is reached, density is higher than 0.95g/cm3When, mixing speed is improved, by Auto-regulating System of Density of Heavy Medium to 0.95g/cm3Hereinafter, obtaining
The water shutoff agent fluid system of low viscosity, density.
S3, will in the water shutoff agent fluid system Injection Level well, carry out water blockoff, water shutoff agent fluid system due to viscosity compared with
Low, density is low, can be rapidly injected in water blockoff well, since the viscosity differences of crude oil and water flooding are big, blocking agent fluid selectivity
The water breakthrough channel in oil well is entered, under the promotion of rear injection fluid, water shutoff agent fluid enters the deep in water breakthrough channel, on ground
Layer temperature is greater than in the environment of 50 DEG C, and selective low-density water shutoff agent crosslinks reaction under the excitation of high temperature, and viscosity is quick
Rise, forms induration, the generation of water breakthrough is blocked, to play the effect blocked for a long time.
Embodiment 2
The present embodiment provides a kind of selective low-density water shutoff agents, and in parts by weight, the water shutoff agent includes: superthin light
100 parts of Paris white, 5 parts of silicon substrate unsaturated polyester resin, 2 parts of polyhydric fatty acid esters, 1 part of biopolymer, high-temperature concretion agent
15 parts.
Wherein, the average grain diameter of the ultra fine calcium carbonate powder is not more than 15 μm, calcium carbonate in superfine light calcium carbonate powder
Content is not less than 95wt%.Solid content is greater than 60% in the silicon substrate unsaturated polyester resin.The polyhydric fatty acid esters are flat
Equal partial size is not more than 15 μm, and wherein substance content is not less than 80%.The biopolymer average grain diameter is not more than 15 μm, glues
Degree is not less than 100mpa.s.
The present embodiment also provides a kind of technique constructed using above-mentioned water shutoff agent, includes the following steps:
S1, under the mixing speed of 500 turns/min, it is dirty that with the charging rate of 50kg/min stratum is added in the water shutoff agent
In water, the mixture of water shutoff agent and water is obtained, the mass percent of water shutoff agent is 35% in the mixture, and water is used in the preparation
For stratum sewage.
S2, continue to stir 30min to reach required viscosity and density up to mixture, obtain water shutoff agent fluid system, block up
The apparent viscosity of aqua fluid system is 15-50mpa.s, and density is 0.75~0.95g/cm3。
S3, by the water shutoff agent fluid system Injection Level well, carry out water blockoff.
Embodiment 3
The present embodiment provides a kind of selective low-density water shutoff agents, and in parts by weight, the water shutoff agent includes: superthin light
100 parts of Paris white, 8 parts of silicon substrate unsaturated polyester resin, 2.5 parts of polyhydric fatty acid esters, 1.5 parts of biopolymer, high temperature is solid
18 parts of agent of knot.
Wherein, the average grain diameter of the ultra fine calcium carbonate powder is not more than 15 μm, calcium carbonate in superfine light calcium carbonate powder
Content is not less than 95wt%.Solid content is greater than 60% in the silicon substrate unsaturated polyester resin.The polyhydric fatty acid esters are flat
Equal partial size is not more than 15 μm, and wherein substance content is not less than 80%.The biopolymer average grain diameter is not more than 15 μm, glues
Degree is not less than 100mpa.s.
The present embodiment also provides a kind of technique constructed using above-mentioned water shutoff agent, includes the following steps:
S1, under the mixing speed of 300 turns/min, the water shutoff agent is added with the charging rate of 35kg/min industrial
In water, the mixture of water shutoff agent and water is obtained, the mass percent of water shutoff agent is 20% in the mixture, and water is used in the preparation
For stratum sewage.
S2, continue to stir 30min to reach required viscosity and density up to mixture, obtain water shutoff agent fluid system, block up
The apparent viscosity of aqua fluid system is 15-50mpa.s, and density is 0.75~0.95g/cm3。
S3, by the water shutoff agent fluid system Injection Level well, carry out water blockoff.
Experimental example 1
1, test preparation be separately added into water mass percent be 5%, 10%, 15%, 20%, 25%, 30%,
The water shutoff agent fluid system that oil well is obtained with selective low-density water shutoff agent in 35% embodiment 1 at room temperature apparent is glued
Degree, density parameter, the results are shown in Table 1.
Table 1
2, the fluid system of above-mentioned different water blockoff agent contents is stood at 50 DEG C, under confined conditions after constant temperature 72h, is cooled to
Room temperature stirs 2h respectively, measures apparent viscosity, density parameter, the results are shown in Table 2.
Table 2
Above-mentioned test result shows that the selective low-density water shutoff agent can keep good when additional amount is lower than 20%
Good mobility is suitable for deep plugging adjustment, and after constant temperature is kept at 50 DEG C, selective low-density water shutoff agent is higher than in additional amount
It is cured when 20%.
3, by the fluid system of above-mentioned different water blockoff agent contents at 150 DEG C closed standing, be cooled to room after constant temperature 48h
Temperature is observed, the solidification situation of measurement system respectively, and the results are shown in Table 3.
Table 3
Above-mentioned test result shows that the additional amount of water shutoff agent should be controlled 15% under conditions of formation temperature is 150 DEG C
Hereinafter, it is made to keep preferable mobility, achieve the purpose that deep plugging adjustment.
4, by the fluid system of above-mentioned different water blockoff agent contents at 250 DEG C closed standing, be cooled to room after constant temperature 48h
Temperature is observed, the solidification situation of measurement system respectively, and the results are shown in Table 4.
Table 4
The above results show formation temperature be 250 DEG C under conditions of, the additional amount of water shutoff agent should control 15% with
Under, so that it is kept preferable mobility, achievees the purpose that deep plugging adjustment.
5, by the fluid system of above-mentioned different water blockoff agent contents, closed standing, constant temperature are cooled to room afterwards for 24 hours at 360 DEG C
Temperature is observed, the solidification situation of measurement system respectively, and the results are shown in Table 5.
Table 5
The above results show formation temperature be 360 DEG C under conditions of, the additional amount of water shutoff agent should control 15% with
Under, so that it is kept preferable mobility, achievees the purpose that deep plugging adjustment.
6, it is 5%, 10%, 15%, 20%, 25%, 30%, 35% that water shutoff agent mass percent is separately added into diesel oil
The selective low-density water shutoff agent fluid system of oil well, oil base selectivity low-density water shutoff agent system is obtained, by the oil base
Selective low-density water shutoff agent system closed standing at 360 DEG C, constant temperature are cooled to room temperature afterwards for 24 hours, respectively observation, measurement system
Solidification situation, the results are shown in Table 6.
Table 6
Above-mentioned test result shows to use oil base selectivity low-density water shutoff agent system in formation temperature for 360 DEG C of item
Under part, when the additional amount of water shutoff agent reaches 35%, preferable mobility can be still kept, achievees the purpose that water blockoff, not stifled oil.
7, different amounts of diesel oil, stirring is added in the selective low-density water shutoff agent fluid system that water blockoff agent content is 35%
Uniformly, the closed standing at 360 DEG C, after constant temperature is kept for 24 hours, after being cooled to room temperature, the oil based system that observes and measures respectively
Solidification situation, the results are shown in Table 7.
Table 7
Above-mentioned test result shows that not same amount is added in the fluid system that selective low-density water blockoff agent content is 35%
Diesel oil, formation temperature be 360 DEG C under conditions of, when diesel oil amount reaches 30% or more, water blockoff system is not cured reaction, can
Good mobility is kept, cannot not achieve the effect that stifledly oil.
8, the water shutoff agent fluid system that test water shutoff agent additional amount is 25% stir normal after 30min under different mixing speeds
Viscosity, density parameter under temperature, test result are as shown in table 8.
Table 8
The above results show the raising with mixing speed, and fluid system density reduces, and viscosity slightly improves, will be above-mentioned
The fluid system obtained under different mixing speeds, constant temperature keeps 48h at 150 DEG C, is all cured, and needle penetration is less than 3mm.
Experimental example 2
1, test preparation be separately added into water mass percent be 5%, 10%, 15%, 20%, 25%, 30%,
The water shutoff agent fluid system that oil well is obtained with selective low-density water shutoff agent in 35% embodiment 2 at room temperature apparent is glued
Degree, density parameter, the results are shown in Table 9.
Table 9
2, the fluid system of above-mentioned different water blockoff agent contents is stood at 50 DEG C, under confined conditions after constant temperature 72h, is cooled to
Room temperature stirs 2h respectively, measures apparent viscosity, density parameter, the results are shown in Table 10.
Table 10
Above-mentioned test result shows that the selective low-density water shutoff agent can keep good when additional amount is lower than 25%
Good mobility is suitable for deep plugging adjustment, and after constant temperature is kept at 50 DEG C, selective low-density water shutoff agent is higher than in additional amount
It is cured when 25%.
3, by the fluid system of above-mentioned different water blockoff agent contents at 150 DEG C closed standing, be cooled to room after constant temperature 48h
Temperature is observed, the solidification situation of measurement system, as a result as shown in table 11 respectively.
Table 11
Above-mentioned test result shows that the additional amount of water shutoff agent should be controlled 20% under conditions of formation temperature is 150 DEG C
Hereinafter, it is made to keep preferable mobility, achieve the purpose that deep plugging adjustment.
4, by the fluid system of above-mentioned different water blockoff agent contents at 250 DEG C closed standing, be cooled to room after constant temperature 48h
Temperature is observed, the solidification situation of measurement system, as a result as shown in table 12 respectively.
Table 12
The above results show formation temperature be 250 DEG C under conditions of, the additional amount of water shutoff agent should control 20% with
Under, so that it is kept preferable mobility, achievees the purpose that deep plugging adjustment.
5, by the fluid system of above-mentioned different water blockoff agent contents, closed standing, constant temperature are cooled to room afterwards for 24 hours at 360 DEG C
Temperature is observed, the solidification situation of measurement system, as a result as shown in table 13 respectively.
Table 13
The above results show formation temperature be 360 DEG C under conditions of, the additional amount of water shutoff agent should control 20% with
Under, so that it is kept preferable mobility, achievees the purpose that deep plugging adjustment.
6, it is 5%, 10%, 15%, 20%, 25%, 30%, 35% that water shutoff agent mass percent is separately added into diesel oil
The selective low-density water shutoff agent fluid system of oil well, oil base selectivity low-density water shutoff agent system is obtained, by the oil base
Selective low-density water shutoff agent system closed standing at 360 DEG C, constant temperature are cooled to room temperature afterwards for 24 hours, respectively observation, measurement system
Solidification situation, as a result as shown in table 14.
Table 14
Above-mentioned test result shows to use oil base selectivity low-density water shutoff agent system in formation temperature for 360 DEG C of item
Under part, when the additional amount of water shutoff agent reaches 35%, preferable mobility can be still kept, achievees the purpose that water blockoff, not stifled oil.
7, different amounts of diesel oil, stirring is added in the selective low-density water shutoff agent fluid system that water blockoff agent content is 35%
Uniformly, the closed standing at 360 DEG C, after constant temperature is kept for 24 hours, after being cooled to room temperature, the oil based system that observes and measures respectively
Solidification situation, as a result as shown in Table 15.
Table 15
Above-mentioned test result shows that not same amount is added in the fluid system that selective low-density water blockoff agent content is 35%
Diesel oil, formation temperature be 360 DEG C under conditions of, when diesel oil amount reaches 30% or more, water blockoff system is not cured reaction, can
Good mobility is kept, cannot not achieve the effect that stifledly oil.
Comparative example 1 and water shutoff agent as described in example 2, water shutoff agent dosage described in embodiment 1 is few, water plugging effect compared with
Good, dosage needed for water shutoff agent as described in example 2 is larger, higher cost.
Experimental example 3
Water plugging of horizontal well scene service condition:
1,44 wells, flat 45 wells, flat 60 wells, flat 64 well, 4 mouthfuls of water horizontal wells are put down in Xinjiang 601-, due to leaning near side (ns) water, after operation
Soon the coning that severe edge water occurs, leads to serious water logging, aqueous to rise rapidly to 100% by 10%, is forced within 2012 long-term
It closes a well in.
Using selective low-density water shutoff agent fluid system described in the present embodiment 1 to Xinjiang 601- put down 44 wells, flat 45 wells,
4 mouthfuls of water horizontal wells such as 60 wells, 64 wells carry out selective water plugging construction, and 601- puts down 44 wells and injects selective low-density water blockoff system
200m3, flat 45 wells inject selective low-density water blockoff system 240m3, flat 60 wells inject selective low-density water blockoff system 180m3、
Flat 64 wells inject selective low-density water blockoff system 200m3.After selective low-density water blockoff envelope alters construction, 4 mouthfuls of wells are all extensive
Demutation produces, and average oil output per well is more than 1200 tons.10 tons of daily oil production or more, water content is down to 60% hereinafter, selectivity is low
Density water plugging effect is significant, good in economic efficiency.
601- put down 44 wells through water shutoff agent fluid system production curve before and after the processing as shown in Figure 1, wherein curve a is represented
Liquid output, unit m3/ d, curve b represent oil production, unit m3/ d, curve c represent water content, unit %, curve d generation
Table outlet temperature, unit be DEG C, test result show using water shutoff agent fluid system handle after, oil production is obviously improved, is aqueous
Amount is remarkably decreased.
2, CNOOC eastern South China Sea Huizhou Oilfield horizontal well HZ19-3-9 water blockoff example:
HZ19-3-9 is a bite horizontal well positioned at eastern South China Sea, 366 meters of horizontal section length, crude oil ground lower density
0.8668, underground viscosity 24mpa.s belong to light oil, paraffin content bottom, bubble point pressure 102psi, underground dnapl oil-gas ratio
0.1m3/m3, underground crude oil air content are lower.4260 barrel/day of Liquid output before water-blocking operation, aqueous 97.7%, 94 barrels of oil-producing/
It, producing pressure differential 100psi.1032 barrel/day of liquid, day are produced daily after in August, 2018 is using selective low-density blocking agent system operation
145 barrel/day of oil-producing, aqueous 86%, compared with declining 11.8% before measure, increase day by day oily 51 barrels/day, and 3228 barrel/day of descending liquid reduces simultaneously
Defeated back pressure outside extra large pipe, releases the other high yield well capacities of Huizhou 19-3 platform, realizes in offshore oil horizontal well chemistry
Important breakthrough in water blockoff field.Production curve is as shown in Figure 2 before and after HZ19-3-9 well water blockoff.
3, the water blockoff example of side water water logging dead well:
C puts down 17 wells: development layer position shop one, net horizontal section perforating length 150m, which is in side waterside edge.The well
Steam injection in July, 2005, after opening well and making production 153 days, water content rises to 100% by 56%, is forced to stop production.Stop production day before yesterday liquid
83.1t/d, day oil 0t/d, aqueous 100%.Being analyzed the well is influenced by the block south water coning, horizontal segment multi-stage outlet.
On December 1st, 2015 17 wells are put down to C and carry out inhibiting side water plug water construction, inject water shutoff agent system 280m altogether3, discharge capacity 10-20m3/
H, injection pressure are increased to 6.5MPa from 4MPa.On December 20th, 2015, after steam injection is gone into operation, 10.2 tons of oil-producing of initial stage day, at present
5.0 tons of oil-producing or so of day, water content 70% is hereinafter, continuous production nearly two year, water layer are effectively blocked.
4, oil reservoir bottom water water logging oilwell water shutoff example:
M-X16 well 2009 go into operation, until in December, 2010 tire out 1700 tons of oil-producing, because of oil reservoir bottom water coning, water content by
The 22% of producing initial stage, is quickly increased to 100%, is forced long-term shutdowns.In July, 2016 uses low-density water blockoff of the present invention
The construction of agent system implementation bottom water plugging, the well inject high temperature low-density water blockoff system 150m altogether3, after operation, produce liquid peak daily
Phase 36.2t/d, day oil 18.4t/d, aqueous 49.2%.To in June, 2017, well day oil-producing 7.6t/d, aqueous 78%.
So far, more than 80 mouth oil wells of selective low-density water shutoff agent system construction, job execution success rate 100% are former
Oil volume increase well account for 95% or more, no oil increasing effect well 5% hereinafter, average moisture content reduce by 15% or more, incremental oil production 40% with
On.
The plug water construction under following complex situations can be widely applied in the selective low-density water shutoff agent system of the oil well:
(1) side water is quick-fried floods water exit interval water blockoff；(2) the quick-fried waterflooding of bottom water section water blockoff layer by layer；(3) macropore water layer section water blockoff；(4) viscous crude heat
Adopt multi-cycle stimulation well water exit interval water blockoff；(5) steam drives section has channeling layer and blocks；(6) high, middle infiltration water-yielding stratum water blockoff；(7) casing
Damaged loss horizon blocks；(8) Carbonate Karst Cave, crack block.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of selectivity low-density water shutoff agent, which is characterized in that in parts by weight, the water shutoff agent includes: superthin light carbon
100 parts of sour calcium powder, 5-10 parts of silicon substrate unsaturated polyester resin, 2-3 parts of polyhydric fatty acid esters, 1-2 parts of biopolymer, high temperature is solid
Agent 15-20 parts of knot.
2. selectivity low-density water shutoff agent according to claim 1, which is characterized in that the superfine light calcium carbonate powder
Average grain diameter is not more than 15 μm, and calcium carbonate content is not less than 95wt% in the superfine light calcium carbonate powder.
3. selectivity low-density water shutoff agent according to claim 1 or 2, which is characterized in that the silicon substrate unsaturated polyester (UP)
Solid content is greater than 60% in resin.
4. selectivity low-density water shutoff agent according to claim 3, which is characterized in that the polyhydric fatty acid esters are averaged grain
Diameter is not more than 15 μm, and wherein substance content is not less than 80%.
5. selectivity low-density water shutoff agent according to claim 4, which is characterized in that the biopolymer average grain diameter
No more than 15 μm, viscosity is not less than 100mpa.s.
6. a kind of technique for preparing selective low-density water shutoff agent as described in any one in claim 1-5, which is characterized in that packet
Include following steps:
S1, superfine light calcium carbonate powder and silicon substrate unsaturated polyester resin are mixed in proportion, needed for being crushed to after drying
Partial size；
S2, biopolymer, polyhydric fatty acid esters, high-temperature concretion agent are mixed in proportion, is crushed to required partial size；
S3, the product for obtaining step S1, S2 are uniformly mixed up to water shutoff agent.
7. preparation process according to claim 6, which is characterized in that additional amount is not less than water shutoff agent obtained in water
When 10%, liquid volume increases by 5% or more, and density is less than 0.95g/cm3。
8. a kind of construction technology of selective low-density water shutoff agent as described in any one in claim 1-5, which is characterized in that packet
Include following steps:
S1, under stirring, by the water shutoff agent be added prepare base fluid in, obtain water shutoff agent and prepare base fluid mixture,
The mass percent of water shutoff agent is 5-35% in the mixture；
S2, continue stirring to required viscosity and density is reached, obtain water shutoff agent fluid system；
S3, by the water shutoff agent fluid system Injection Level well, carry out water blockoff.
9. construction technology according to claim 8, which is characterized in that in the step S1 mixing speed be 50-500 turn/
Min, the addition speed of water shutoff agent are 25-50kg/min；Mixing time is no less than 30min in the step S2.
10. construction technology according to claim 9, which is characterized in that the apparent viscosity of the water shutoff agent fluid system is
15-50mpa.s, density are 0.75~0.95g/cm3。
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| CN118754712A (en) * | 2024-07-18 | 2024-10-11 | 四川兰冠能源科技有限公司 | A selective water plugging agent and preparation method thereof |
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| SU1059132A1 (en) * | 1971-02-04 | 1983-12-07 | Читинское Геологическое Управление | Plugging composition for eliminating flushing fluid absorption zones when drilling a well |
| CN104774602B (en) * | 2014-01-14 | 2018-06-12 | 中国石油化工股份有限公司 | A kind of high temperature resistant sealing agent, preparation method and application |
| CN107739599A (en) * | 2017-10-13 | 2018-02-27 | 东营威固石油技术有限公司 | A kind of high temperature low-density water shutoff agent and preparation method thereof and onsite application method |
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