CN106437649A - Immoveable pipe column construction process using in-layer gas self-production and yield-increasing method - Google Patents
Immoveable pipe column construction process using in-layer gas self-production and yield-increasing method Download PDFInfo
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- CN106437649A CN106437649A CN201610870704.3A CN201610870704A CN106437649A CN 106437649 A CN106437649 A CN 106437649A CN 201610870704 A CN201610870704 A CN 201610870704A CN 106437649 A CN106437649 A CN 106437649A
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- 238000010276 construction Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title abstract description 14
- 230000008569 process Effects 0.000 title abstract description 9
- 238000005260 corrosion Methods 0.000 claims abstract description 28
- 230000007797 corrosion Effects 0.000 claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 230000001965 increasing effect Effects 0.000 claims abstract description 17
- 239000002253 acid Substances 0.000 claims abstract description 16
- 239000003129 oil well Substances 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003112 inhibitor Substances 0.000 claims abstract description 8
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004202 carbamide Substances 0.000 claims abstract description 7
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 6
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 5
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 5
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 5
- 239000012224 working solution Substances 0.000 claims description 41
- 238000005516 engineering process Methods 0.000 claims description 32
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 12
- -1 imidazoline quaternary ammonium salt Chemical class 0.000 claims description 10
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 9
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical group [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 claims description 5
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 4
- 230000005764 inhibitory process Effects 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 4
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical group [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- 235000019260 propionic acid Nutrition 0.000 claims description 2
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 2
- 239000004317 sodium nitrate Substances 0.000 claims description 2
- 235000010344 sodium nitrate Nutrition 0.000 claims description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims 2
- 235000010288 sodium nitrite Nutrition 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 8
- 230000006378 damage Effects 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 3
- 230000015271 coagulation Effects 0.000 abstract 1
- 238000005345 coagulation Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 38
- 239000007789 gas Substances 0.000 description 31
- 230000000694 effects Effects 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000013043 chemical agent Substances 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000237858 Gastropoda Species 0.000 description 1
- 241000772415 Neovison vison Species 0.000 description 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- PMUIBVMKQVKHBE-UHFFFAOYSA-N [S].NC(N)=O Chemical group [S].NC(N)=O PMUIBVMKQVKHBE-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003196 chaotropic effect Effects 0.000 description 1
- 230000002595 cold damage Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000001179 sorption measurement Methods 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides an immoveable pipe column construction process using an in-layer gas self-production and yield-increasing method, and relates to the technical field of oilfield development. The construction process comprises the steps of injecting gel in an oil well, injecting an anionic surfactant, in-layer gas-producing working liquid and displacing liquid sequentially after coagulation, and performing liquid production by a waterflooding method after shut-in reaction, wherein the step of injecting the in-layer gas-producing working liquid is conducted by three steps of injecting gas-producing working liquid consisting of urea, acid and a corrosion inhibitor, injecting isolating liquid and injecting gas-producing working liquid consisting of nitrate or nitrite and a corrosion inhibitor through oil jacket annular space. According to the construction process, formation plugging can be effectively eliminated, formation energy can be effectively increased and the aims of increasing oil and reducing water are fulfilled; corrosion damage to production of pipe columns, electric pump units and cables can be avoided; and the operation cost, the labor intensity, the construction cycle and the oil layer pollution risk can be reduced.
Description
Technical field
The present invention relates to oil field development technical field.
Background technology
Viscous crude occupies larger proportion in World's Oil and Gas Resources, and current world heavy oil reserves are 100,000,000,000 tons, Chinese viscous crude
Reserves have also reached more than 30,000,000,000 tons.Since eighties of last century sixties, the DP technology technology based on oil reservoir viscosity reduction is
Become one of technical way of thickened oil recovery, wherein thermal recovery, chemical agent is handled up and CO2Technology application of handling up is more general
Time.It is known that no matter using which type of recovery method, noting CO in oil reservoir2Gas is raising single well productivity and crude oil is adopted
One of most efficient method of yield.The method not only can be used for exploiting light oil it is also possible to for exploiting mink cell focus.But
It is that the principal element restricting its application is exactly source of the gas shortage, corrosion and scaling, stratum cold damage, transportation safety and high cost, greenhouse
The problems such as gas discharges.In layer, certainly angry technology is a kind of new technology developed in recent years, and this technology is built upon stratum
Interior generation CO2On gas basis, rather than directly inject CO from ground installation to stratum2Gas.This technology one side can
Retain and note CO toward in stratum2All advantages that gas recovers the oil, on the other hand, can overcome again and note CO from ground2Gas brings
Shortcoming.Under formation temperature and pressure condition, CO2Gas can be single-phase or mixed phase, or show bubble state.This
The core of item technology is to be injected into ground in the layer chemical agent chemical reaction occurs in stratum, forms CO2Gas, and discharge a large amount of
Heat.
In recent years, J oil field researcher explores in development layer and handles up this emerging technology from anger, is extended to ground
The oil well that layer energy is low, infiltration is low, reservoir Crude viscosity is high.There is high cost for such technology, workload is big, be difficult in adapt to
Complicated geology oil well requires, and single chemical huffpuff technology there is also formation damage, de-plugging undesirable the problems such as, scientific research personnel
Creatively propose in layer from angry compound throughput technology, will be combined from angry and chemical huffpuff in layer, work in coordination with
Synergy.In the heavy crude reservoirs such as W5, W8 application 14 well, average individual well increases 426 tons of oil to this technique, and input-output ratio is more than 1: 6.
In order to improve measure effect and reduces cost further, from the fixed tubular column construction work of angry yield-increasing technology in developmental research layer
Skill.Fixed tubular column construction has reduction operating cost, reduces labour intensity, shorten construction period, reduce oil layer pollution risk etc.
Advantage.
In layer from angry single well stimulation work progress, in order to avoid the acid in working solution causes to underground equipment to corrode,
Generally using dynamic tubing string construction, that is, after playing out well Central Plains flow string, under enter special acidifying tubing string injection inorganic agent, construction knot
Shu Hou, recur out acidifying tubing string, under enter original production tubing string, resume production.There is problems with this construction：1）Operational procedure is many,
High labor intensive；2）Change operating tool string and lead to operating cost height, long construction period.
Content of the invention
The present invention seeks to proposing one kind operating cost can be reduced, reduces labour intensity, shorten construction period, reduce oil reservoir
From the fixed tubular column construction technology of angry method for increasing in the layer of pollution risk.
The technical scheme is that：First inject gel to oil well, reinject successively after condensing anion surfactant,
Situ gas generating working solution, displacement fluid, carry out adopting liquid using water drive method after closing well reaction；It is characterized in that：Raw in implanted layer
During gas working solution, carried out in three steps by oil jacket annular space, the angry work that first step injection is made up of urea, acid and corrosion inhibiter
Make liquid, second step injects insulating liquid, the aerogenesis working solution that the 3rd step injection is made up of nitrate or nitrite and corrosion inhibiter.
The present invention actually handle up construction technology by a kind of situ gas generating of oil well production increasing, will change original production in work progress
Tubing string is improved to the construction of original production tubing string, and it is mainly characterized by, on the basis of optimization system is filled a prescription, entering using original production tubing string
Row operation, injects angry working solution, insulating liquid and aerogenesis working solution to oil jacket annular space successively, then reinjects displacement fluid, closing well
Carry out adopting liquid using water drive method after reaction.The present invention have reduction operating cost, reduce labour intensity, shorten construction period,
The advantages of reduce oil layer pollution risk.
The present invention divides three step three formula injection situ gas generating working solutions, particularly inject before injection aerogenesis working solution every
Chaotropic, can be prevented effectively from angry working solution and aerogenesis working solution reacts in pit shaft.
Beneficial effect of the present invention：
1st, effectively release formation blockage, increase stratum energy, reach the purpose of oil increasing precipitation；
2nd, flow string, electric pump unit, cable corrosion injury are avoided；
3rd, reduce operating cost, reduce labour intensity, shorten construction period, reduce oil layer pollution risk etc..
Further, of the present invention anger working solution in acid be organic acid or inorganic acid, example hydrochloric acid, phosphoric acid, acetic acid or
Propionic acid, optimum acid solution is hydrochloric acid, and the mass ratio of urea, hydrochloric acid and inhibition agent composition is 9: 9～27: 0.5～2（Salt in ratio
Acid concentration is commodity concentration）, optimal proportion is 9: 18: 1.
In aerogenesis working solution of the present invention, nitrate is sodium nitrate or ammonium nitrate, and nitrite is natrium nitrosum or nitrous
Sour ammonium, preferably natrium nitrosum, described natrium nitrosum is 10: 1 with the mass ratio of corrosion inhibiter.
Compared with traditional carbonate and acid fluid system, formula of the present invention has the advantage that gas production is big, thermal discharge is high,
The gas flow producing is 2.6 times of document report anger formula system, and the heat of generation can make basal liquid be raised to 94 DEG C by 25 DEG C,
Conventional formulation only makes basal liquid be raised to 60 DEG C by 20 DEG C.
Containing acid, in construction operation, easily cause ground installation, tube rod, pump, electricity due in more than the present invention angry formula
The corrosion phenomenons such as cable.
The present invention still further developed a kind of high-efficient corrosion inhibitor, and described corrosion inhibiter is by water-soluble imidazoline quaternary ammonium salt derivative and sulphur
Urea forms, and the mixed volume of water-soluble imidazoline quaternary ammonium salt derivative and thiocarbamide is than for 1～6: 1.This corrosion inhibiter contains nitrogen, sulphur unit
Element, these element outermost layers contain non-bond electron pair, and the unoccupied orbital that they can enter metal structure forms ligand, in metal
Surface produces the adsorption layer of inhibitor molecular, suppresses metal erosion；In addition, this corrosion inhibiter is to the CO producing2Corrosion equally has
Inhibitory action.
The mixed volume of more preferably described water-soluble imidazoline quaternary ammonium salt derivative and thiocarbamide is than for 5: 1.
In addition, gel of the present invention is made up of acrylamide, ammonium persulfate, organic phenolic aldehyde and polymerization inhibitor ZJ-1.This coagulates
Glue can block high permeability formation, low-permeability layer in making the treatment fluid being subsequently implanted into enter, and improve swept volume, improve oil increasing effect.
Described anion surfactant is surfactant R D-06, can effectively reduce crude oil interfacial tension and crude oil glues
Degree.
The sal-ammoniac that described displacement fluid is 0.4% for mass percent（NH4Cl）The aqueous solution, can be by working solution in pit shaft
Head into oil reservoir, it is to avoid oil jacket tube rod corrosion and scaling, increase working solution in oily in the layer operating radius simultaneously, and have in oil reservoir
Effect plays antiexpanding action.
Brief description
Fig. 1 is prior art anger working solution and gas flow contrast produced by situ gas generating working solution concentration of the present invention
Figure.
Specific embodiment
First, each raw material prepares：
1st, gel：It is made up of acrylamide, ammonium persulfate, organic phenolic aldehyde and polymerization inhibitor ZJ-1.
Wherein acrylamide, the mixing quality of ammonium persulfate, organic phenolic aldehyde and polymerization inhibitor ZJ-1 are than for 4: 0.4: 1.2: 1.
2nd, anion surfactant：Mass percent is 0.6% surfactant R D-06, reaches oil field by Yang Zhourun
The production and sales of Xue Ji Co., Ltd.
3rd, situ gas generating working solution：
1）Angry working solution：The aqueous solution is formulated as according to certain mass ratio by urea, hydrochloric acid and corrosion inhibiter, mass ratio be 9: 9～
27: 0.5～2, optimum proportioning is 9: 18: 1.
2）Aerogenesis working solution：The aqueous solution is formulated as according to certain mass ratio by natrium nitrosum and corrosion inhibiter, mass ratio is 10:
1.
3）Insulating liquid：Using live water, for avoiding angry working solution and aerogenesis working solution to react in pit shaft, injecting
In journey, angry working solution and aerogenesis working solution are separated by injection using isolation slug；And isolation slug is noted than oil pipe during sleeve pipe injection
Fashionable big 1.2 times.
Fig. 1 shows using present invention process with traditional from angry formula（Mixing as sodium acid carbonate and hydrochloric acid composition
System）The comparison diagram of the gas producing respectively is it is seen that the gas flow that the present invention produces is 2.6 times that tradition produces gas flow.
Following table is simulation corrosion inhibition table in oil pipe for the corrosion inhibiter of the present invention, within the temperature range of 50～90 DEG C, delays
Erosion agent C can reach the first class index that professional standard specifies（Corrosion inhibiter method for testing performance is used in SY/ T 5405- 1996 acidifying
And evaluation index）, that is, it is less than 2～3 g/（m3.h）.
For electric submersible pump pumpingh well, the corruption of end to electric pump unit of acid solution in considering to fill a prescription and size flat cable joint
Erosion.Mounted end is put in acid corrosion container, under conditions of 1.5MPa, 85 DEG C, in test layer, inflating medium is to electricity
The corrosion condition of cable end.Result is as follows.
End corrosion test result
As can be seen from the table, under conditions of 1.5MPa, 85 DEG C, corrode 12h, leaky in end, with ohm
Table records its resistance and is more than 1000M Ω, illustrates that acid formula does not result in corrosion failure to end, insulation degree is good.
4th, displacement fluid：Mass percent is 0.4% ammonia chloride water solution.
2nd, optimization of construction technology：
1st, well-flushing：
All should thorough well-flushing before and after construction.1. thorough well-flushing before constructing, can make oil pipe and its oil jacket annular space before note working solution
Hydraulically full, prevent the active acid in working solution from entering annular space, corrode tubing string；2. construction terminates rear well-flushing, can remove raffinate
The not thoroughly interior residue in the raffinate of the row of returning and oil pipe, dead oil, dirt and the materials such as wax after the row of returning, prevent these materials dirty further
Dye stratum（Annular space injection heavy oil wells more it should be noted that）.
2nd, operating process：
First inject gel to oil well, reinject anion surfactant, situ gas generating working solution, replacement after condensing successively
Liquid, carries out adopting liquid using water drive method after closing well reaction.
When injecting situ gas generating working solution, carried out in three steps by oil jacket annular space：The angry work of first step injection
Liquid, second step injects insulating liquid, the 3rd step injection aerogenesis working solution.
3rd, raffinate returns row：
Operation is resumed production after finishing the row's of returning raffinate as early as possible.After construction terminates, in order to prevent from generating precipitation and be suspended in raffinate
Some insoluble substances precipitate blocking duct, the reaction time should be shortened as far as possible, it is discharged as far as possible.Thus, full
The high jig frequency discharge opeing in the case of not shaking out of sufficient stratum, when producing liquid stable performance, switchs to normally produce.
Different oil well raffinates return row's mode and also differ.After common oil well discharge opeing closing well reaction terminates, angry reaction generates
A large amount of gases lead to formation pressure to raise, after driving a well, due to the pressure reduction of oil reservoir and well head, pit shaft raffinate is returned to be drained into well head and enters
Waste liquid treatment tank；Electric immersible pump well is then directly raffinate to be evacuated to well head using electric submersible pump to enter waste liquid treatment tank.
4th, injection mode：
Common bar pumping oil well injects situ gas generating working solution by oil jacket annular space；For electric submersible pump pumpingh well, to oil pipe positive injection
Situ gas generating working solution.Two kinds of injection modes of contrast, oil pipe injection has the advantage that：1. electric pump motor, cable and joint will not
Touch acid solution；2. oil pipe volume is less than oil jacket annular volume, and the therefore liquid measure of injection injects the 83% about of liquid measure for sleeve pipe；
3. working solution enters stratum, instant effect faster；4. displacement fluid dosage few hence it is evident that shorten the activity duration.
3rd, apply：
1st, block reservoir properties are tested：
From angry compound throughput technology in somewhere oil field 5 mouthfuls of oil wells of W5, W8 block successful Application in fixed tubular column layer, W5, W8 block tries
Test the geology of well and fluid properties see table.
Test block characteristics of reservoirs table
Note：μ viscosity of crude,ρOil density, TDS salinity, Ca2++Mg2+Calcium ions and magnesium ions total content
2nd, work progress
1. treatment process
A. injection mode：Oil jacket annular space injects（Tubular column structure is original production tubing string）.
B. operational discharge capacity：When discharge capacity ensures injection inflating medium and gas generating agent system, operation pressure can crush stratum.
C. operation pressure：Less than formation fracture pressure.
2. construction procedure
A. chemical agent is prepared：Prepare including gel, surfactant solution, inflating medium aerogenesis agent solution, displacement fluid etc..
B. well-flushing：Steam well-flushing.
C. injection process
Connect injection pump to converge with Agitation Tank upper hose, open head valve, injection pump outlet valve and manifold, join liquid outlet valve
Door, checks that each slug is injected in errorless rear preparation, controls injection pump pressure, the injection of all slugs requires injection process continuously to put down
Surely, concrete steps：Gel → surfactant → situ gas generating working solution → displacement fluid → closing well reaction.
D. handle up subsequent handling：
After having squeezed replacement slug, closing well, mouth falloff curve of logging well, depending on concrete closed time is according to well head pressure change.Vexed well
Tank is entered from sleeve pipe open flow after end.Then, peg, examination are taken out（First with maximum stroke jig frequency discharge opeing, after turn normal parameter and produce）.
3rd, effect analysis：
Situ gas generating compound throughput technology successfully realizes fixed tubular column construction technology in somewhere oil field W5-7 well, W8-24 well, this work
Skill individual well can reduce and plays lower tubular column work operations amount and 3-4 days construction periods twice.Stimulation is imitated in by the end of February, 2016 for cut-off
Fruit substantially, see table.
Fixed tubular column situ gas generating compound throughput technology effect of field application table
Claims (10)
1., from the fixed tubular column construction technology of angry method for increasing in layer, first inject gel to oil well, note again successively after condensing
Enter anion surfactant, situ gas generating working solution, displacement fluid, carry out adopting liquid using water drive method after closing well reaction；It is special
Levy and be：When injecting situ gas generating working solution, carried out in three steps by oil jacket annular space, the first step is injected by urea, acid
With the angry working solution of corrosion inhibiter composition, second step injection insulating liquid, the 3rd step is injected by nitrate or nitrite and inhibition
The aerogenesis working solution of agent composition.
2. according to claim 1 in layer from the fixed tubular column construction technology of angry method for increasing it is characterised in that：Described life
In gas working solution, acid is hydrochloric acid, phosphoric acid, acetic acid or propionic acid.
3. according to claim 2 in layer from the fixed tubular column construction technology of angry method for increasing it is characterised in that：Described life
In gas working solution, acid is hydrochloric acid, and the mass ratio of urea, hydrochloric acid and inhibition agent composition is 9: 9～27: 0.5～2.
4. according to claim 3 in layer from the fixed tubular column construction technology of angry method for increasing it is characterised in that：Described life
In gas working solution, the mixing quality of urea, hydrochloric acid and corrosion inhibiter is than for 9: 18: 1.
5. according to claim 1 in layer from the fixed tubular column construction technology of angry method for increasing it is characterised in that：Described product
In gas working solution, nitrate is sodium nitrate or ammonium nitrate, and nitrite is natrium nitrosum or ammonium nilrite.
6. according to claim 5 in layer from the fixed tubular column construction technology of angry method for increasing it is characterised in that：Described product
Gas working solution Sodium Nitrite is 10: 1 with the mass ratio of corrosion inhibiter.
7., from the fixed tubular column construction technology of angry method for increasing in claim 1 or 2 or 3 or layer described in 4 or 5, it is special
Levy and be：Described corrosion inhibiter is made up of water-soluble imidazoline quaternary ammonium salt derivative and thiocarbamide, and water-soluble imidazoline quaternary ammonium salt derives
The mixed volume of thing and thiocarbamide is than for 1～6: 1.
8. according to claim 7 in layer from the fixed tubular column construction technology of angry method for increasing it is characterised in that：Described water
The mixed volume of dissolubility imidazoline quaternary ammonium salt derivative and thiocarbamide is than for 5: 1.
9. according to claim 1 in layer from the fixed tubular column construction technology of angry method for increasing it is characterised in that：Described solidifying
Acrylamide, ammonium persulfate, organic phenolic aldehyde and polymerization inhibitor ZJ-1 that glue is 4: 0.4: 1.2: 1 by mass ratio form.
10. according to claim 1 in layer from the fixed tubular column construction technology of angry method for increasing it is characterised in that：Described
Displacement fluid is ammonia chloride water solution.
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| WO2023035416A1 (en) * | 2021-09-08 | 2023-03-16 | 西南石油大学 | Shale gas layer oxidative burst transformation method |
| CN117126654A (en) * | 2022-05-19 | 2023-11-28 | 中国石油天然气股份有限公司 | Blocking remover, preparation method, use method and application |
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Application publication date: 20170222 |