CN112443301A - Method for improving crude oil recovery ratio by integrating oil displacement and pressure reduction - Google Patents
Method for improving crude oil recovery ratio by integrating oil displacement and pressure reduction Download PDFInfo
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- CN112443301A CN112443301A CN202011393452.2A CN202011393452A CN112443301A CN 112443301 A CN112443301 A CN 112443301A CN 202011393452 A CN202011393452 A CN 202011393452A CN 112443301 A CN112443301 A CN 112443301A
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- oil displacement
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- 239000003921 oil Substances 0.000 title claims abstract description 175
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 131
- 239000010779 crude oil Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000011084 recovery Methods 0.000 title claims abstract description 24
- 230000009467 reduction Effects 0.000 title claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 122
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 103
- 239000007924 injection Substances 0.000 claims abstract description 64
- 238000002347 injection Methods 0.000 claims abstract description 64
- 230000008961 swelling Effects 0.000 claims abstract description 38
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229940073507 cocamidopropyl betaine Drugs 0.000 claims abstract description 23
- 238000007865 diluting Methods 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000002455 scale inhibitor Substances 0.000 claims abstract description 19
- 238000010790 dilution Methods 0.000 claims description 18
- 239000012895 dilution Substances 0.000 claims description 18
- 230000000536 complexating effect Effects 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 21
- 239000000243 solution Substances 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 8
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000012466 permeate Substances 0.000 abstract description 4
- 238000001556 precipitation Methods 0.000 abstract description 4
- 229960003237 betaine Drugs 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract description 3
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 abstract 1
- 239000004005 microsphere Substances 0.000 description 9
- 239000003129 oil well Substances 0.000 description 7
- 239000009096 changqing Substances 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 5
- 239000011435 rock Substances 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- -1 i.e. Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 230000007794 irritation Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000011882 ultra-fine particle Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- ROSDSFDQCJNGOL-UHFFFAOYSA-N protonated dimethyl amine Natural products CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002888 zwitterionic surfactant Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
Abstract
The invention discloses a method for improving the recovery ratio of crude oil by integrating oil displacement and pressure reduction, which comprises the following steps: s1, preparing an oil displacement agent, and dividing the oil displacement agent into an oil displacement agent A, an oil displacement agent B and an oil displacement agent C, wherein the oil displacement agent comprises cocamidopropyl betaine, a complex scale inhibitor, a swelling reducing agent and a swelling shrinking agent; s2, diluting the oil displacement agent A, and injecting the oil displacement agent A into a perforation section horizon of the water injection well; s3, diluting the oil displacement agent B, and injecting the oil displacement agent B into a perforation section horizon of the water injection well; and S4, diluting the oil displacement agent C, and injecting the oil displacement agent C into the perforation section horizon of the water injection well. After the oil displacement agent is injected, the oil displacement agent can dissolve structural substances blocked in stratum channels to form stable water-soluble compounds, channel blockage is avoided, betaine solution can also rapidly permeate into the structural substances to loosen the structural substances, the dispersed structural substances are dispersed in a solution in a water injection channel, secondary precipitation of scale removing substances is avoided, and the scale removing effect is guaranteed.
Description
Technical Field
The invention relates to the technical field of crude oil recovery, in particular to a method for improving the recovery ratio of crude oil by integrating oil displacement and pressure reduction. The oil extraction method is particularly suitable for oil extraction of long 4+5, long 6 and long 8 oil reservoirs of a three-fold system of the Changqing oil field, wherein 4+5, 6 and 8 are codes of oil layers of the Changqing oil field.
Background
Crude oil, i.e., petroleum, also known as "black gold", is conventionally referred to as crude oil produced directly from an oil well as raw petroleum, which is a dark brown or dark green viscous liquid or semi-solid combustible substance composed of various hydrocarbons.
In the development stage of oil field in China, water injection and oil displacement are carried out, and after long-time water injection, the oil field is basically produced in three exploitation stages of high water content, ultrahigh water content and medium-low water content at present, and in order to excavate the residual oil in the three stages, a technical method for improving the recovery ratio of crude oil is often adopted.
The level of recovery is related to many factors, not only to the natural conditions of reservoir lithology, physical properties, heterogeneity, fluid properties, and drive type, but also to the development scheme adopted in developing the oil field. The crude oil recovery method mainly improves sweep efficiency and oil displacement efficiency, but the conventional water injection well profile control aims at improving the sweep efficiency of injected water and increasing the yield of an oil well, but the method is only suitable for water injection oil fields with high water content and ultrahigh water content, for the oil field with medium and low water content, the water injection pressure is increased due to profile control, so that the effect of improving the crude oil yield of the oil field with medium and low water content is poor, in the later stage of water injection, the water injection channel in the stratum is injected with water for a long time to generate mineral substances such as calcium carbonate and the like in the water injection process, so that the water injection channel is blocked, during the process of continuing water injection, water can be accumulated at a certain position of the stratum, so that the pressure of the stratum is increased, the water injection resistance is increased, and further, the water injection pressure is increased, the purpose of water injection and oil displacement cannot be met, the follow-up water injection is difficult, the requirement of water injection cannot be met, the insufficient injection is caused, and the residual crude oil cannot be effectively displaced.
Disclosure of Invention
The invention aims to provide a method for integrally improving the crude oil recovery rate by oil displacement and pressure reduction, which can dissolve substances blocked in a water injection channel, further reduce the water injection pressure of a medium-high pressure underinjected water injection well, improve the oil displacement efficiency and further improve the oil well yield.
The technical scheme for realizing the purpose of the invention is as follows:
a method for improving the recovery ratio of crude oil by integrating oil displacement and pressure reduction comprises the following steps:
s1, preparing an oil displacement agent, dividing the oil displacement agent into an oil displacement agent A, an oil displacement agent B and an oil displacement agent C, wherein the oil displacement agent comprises cocamidopropyl betaine, a complex scale inhibitor, a swelling reducing agent and a swelling shrinking agent,
70-80% of cocamidopropyl betaine, 10-15% of complexing scale inhibitor, 5-7% of swelling reducing agent and 5-8% of swelling shrinking agent;
s2, diluting the oil displacement agent A into water with the dilution concentration a, and then injecting the diluted oil displacement agent A into the position of a perforation section of the water injection well;
s3, diluting the oil displacement agent B into water with the dilution concentration of B, and then injecting the diluted oil displacement agent B into the position of a perforation section of the water injection well;
s4, diluting the oil displacement agent C into water with the dilution concentration a, and then injecting the diluted oil displacement agent C into the position of a perforation section of the water injection well;
wherein b is a-0.1%.
Further, a is 0.3 to 1.0%.
Furthermore, a is 0.5-0.6%, and the oil displacement agent with the concentration can effectively reduce the tension of an oil-water interface, improve the oil recovery rate and reduce the water injection pressure.
Further, the mass fraction of the cocamidopropyl betaine is 75%, the mass fraction of the complexing scale inhibitor is 13%, the mass fraction of the swelling reducing agent is 6%, and the mass fraction of the swelling shrinking agent is 6%.
Furthermore, the complexing scale inhibitor is organic phosphate, the swelling reducing agent is organic polycationic salt containing nitrogen, phosphorus and sulfur, and the swelling shrinking agent is active inorganic semiconductor ultrafine particles.
Compared with the prior art, the beneficial effects of the invention are as follows:
the cocamidopropyl betaine solution is aqueous solution of cocamidopropyl dimethylamine ethyl lactone with molecular formula of [ RCONH (CH)2)3N+(CH3)2CH2COO-), which is from plants, is a complex macromolecular organic matter, and has the advantages of high viscosity, no irritation, no toxic or side effect, high safety performance, easy biodegradation and good compatibility;
after the oil displacement agent is injected, the oil displacement agent can dissolve structural substances blocked in a stratum channel to form a stable water-soluble compound, so that the channel blockage is avoided, the betaine solution can also quickly permeate into the structural substances to change the structure and the property, so that the structural substances become loose, the dispersed structural substances are further dispersed in a solution in a water injection channel, the descaling substances are prevented from generating secondary precipitation, and the descaling effect is ensured;
the oil displacement agent has the advantages that the cocamidopropyl betaine is a natural plant surfactant, the interfacial tension between an oil phase and a displacement water phase can be reduced, when the plant surfactant solution is diffused in the displacement water phase and reaches an oil-water interface, the ultralow interfacial tension is formed, when the interfacial tension is low enough, the capillary force of an oil film which captures crude oil on a rock can be weakened, the oil film can fall off from the surface of the rock, oil drops can flow under the action of viscous force and gravity, the saturation of residual oil is reduced, and the purpose of oil displacement is achieved; when the residual crude oil is brought out along with the plant surfactant solution, the pressure of the reservoir of the oil field is reduced at the same time, and the water injection pressure is further reduced.
Detailed Description
The present invention is described in detail with reference to the following embodiments, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functional, method, or structural equivalents of these embodiments or substitutions may be made without departing from the scope of the present invention.
The specific embodiment provides a method for integrally improving the recovery ratio of crude oil by oil displacement and pressure reduction, wherein the crude oil in a low-water-content oil field is subjected to oil displacement and recovery by using cocamidopropyl betaine solution. The cocamidopropyl betaine is a zwitterionic surfactant, has excellent stability under acidic and alkaline conditions, presents positive and negative ions respectively, has good compatibility, small irritation, is easy to dissolve in water, is stable to acid and alkali, and soaks, permeates and strips crude oil in oil-containing mud by utilizing the surface activity of the cocamidopropyl betaine, so that the recovery ratio of the crude oil is improved.
A method for improving the recovery ratio of crude oil by integrating oil displacement and pressure reduction comprises the following steps:
s1, preparing an oil displacement agent, dividing the oil displacement agent into an oil displacement agent A, an oil displacement agent B and an oil displacement agent C, wherein the oil displacement agent comprises cocamidopropyl betaine, a complex scale inhibitor, a swelling reducing agent and a swelling shrinking agent,
70-80% of cocamidopropyl betaine, 10-15% of complexing scale inhibitor, 5-7% of swelling reducing agent and 5-8% of swelling shrinking agent;
s2, diluting the oil displacement agent A into water, wherein the dilution concentration is a (after the oil displacement agent is diluted into the water, the concentration of the oil displacement agent is a), and then injecting the diluted oil displacement agent A into a perforation section horizon of the water injection well;
s3, diluting the oil displacement agent B into water to a dilution concentration B (namely after the oil displacement agent is diluted into the water, the concentration of the oil displacement agent is B), and then injecting the diluted oil displacement agent B into a perforation section horizon of the water injection well;
s4, diluting the oil displacement agent C into water with the dilution concentration a, and then injecting the diluted oil displacement agent C into the position of a perforation section of the water injection well;
b is a-0.1%, and in addition, in the process of injecting the diluted oil displacement agent, production data of the water injection well is regularly observed, and the change of water injection pressure is checked; the molecular formula of the cocamidopropyl betaine is [ RCONH (CH)2)3N+(CH3)2CH2COO-】。
When a is 0.3-1.0% (after the oil displacement agent is diluted into water, the concentration of the oil displacement agent is 0.3-1.0%), the tension of an oil-water interface can be further reduced, the oil recovery rate is improved, and the water injection pressure is reduced.
When a is 0.5-0.6%, the oil displacement agent with the concentration can effectively reduce the tension of an oil-water interface, improve the oil recovery rate and reduce the water injection pressure.
The complexing scale inhibitor is organic phosphate, the swelling reducing agent is an organic polycationic salt containing nitrogen, phosphorus and sulfur, the swelling shrinking agent is active inorganic semiconductor ultrafine particles, the mass fraction of the cocamidopropyl betaine is 75%, the mass fraction of the complexing scale inhibitor is 13%, the mass fraction of the swelling reducing agent is 6%, and the mass fraction of the swelling shrinking agent is 6%; the scale removing device can effectively dissolve structural substances blocked in stratum channels, avoids channel blockage, further disperses the dispersed structural substances in the solution in the water injection channel, avoids the scale removing substances from generating secondary precipitation, and ensures the scale removing effect.
Example 1:
the embodiment is described by taking a gunn 269 trunk line 10-port water injection well group of a long8 oil reservoir 271 block in a Changqing oil field in 5 months in 2019 as an example, and comprises the following steps:
a method for improving the recovery ratio of crude oil by integrating oil displacement and pressure reduction comprises the following steps:
s1, preparing an oil displacement agent, dividing the oil displacement agent into an oil displacement agent A, an oil displacement agent B and an oil displacement agent C, wherein the oil displacement agent comprises cocamidopropyl betaine, a complex scale inhibitor, a swelling reducing agent and a swelling shrinking agent,
the mass fraction of the cocamidopropyl betaine is 80%, the mass fraction of the complexing scale inhibitor is 10%, the mass fraction of the swelling reducing agent is 5%, and the mass fraction of the swelling shrinking agent is 5%;
s2, diluting the oil displacement agent A into water, wherein the dilution concentration is 0.3%, and then injecting the diluted oil displacement agent A into the position of a perforation section of the water injection well through a microsphere pump;
s3, diluting the oil displacement agent B into water, wherein the dilution concentration is 0.2%, and then injecting the diluted oil displacement agent B into the perforation section layer of the water injection well through a microsphere pump;
and S4, diluting the oil displacement agent C into water, wherein the dilution concentration is 0.3%, and then injecting the diluted oil displacement agent C into the perforation section layer of the water injection well through a microsphere pump.
In the embodiment, after oil displacement and oil recovery are carried out by using the gunn 269 trunk line 10-port water injection well group in the gunn 271 area of the long 8 oil reservoir in the Ji tableland, the 10-port water injection wells are injected for 233 days in an accumulated manner, the total injected and diluted oil displacement agent is 78000kg, the average water injection pressure of the 10-port water injection wells is reduced from 19.9Mpa to 18.8Mpa, wherein the pressure reduction of 7-port water wells is obvious, and the average water injection pressure is reduced from 20.3Mpa to 18.3 Mpa; the oil yield of 25 corresponding to 44 oil wells is improved, the efficiency is 56.8 percent, the water content is reduced, and the natural decrement is reduced from 10.3 percent to 5.6 percent. The effective period is up to 12 months (still effective at present).
Example 2:
the embodiment takes a well group of 325-97 towns in Changqing oil field Chang8 reservoir town 277 of 7 months in 2019 as an example for introduction, and comprises the following steps:
a method for improving the recovery ratio of crude oil by integrating oil displacement and pressure reduction comprises the following steps:
s1, preparing an oil displacement agent, dividing the oil displacement agent into an oil displacement agent A, an oil displacement agent B and an oil displacement agent C, wherein the oil displacement agent comprises cocamidopropyl betaine, a complex scale inhibitor, a swelling reducing agent and a swelling shrinking agent,
the mass fraction of the cocamidopropyl betaine is 75%, the mass fraction of the complexing scale inhibitor is 13%, the mass fraction of the swelling reducing agent is 6%, and the mass fraction of the swelling shrinking agent is 6%;
s2, diluting the oil displacement agent A into water, wherein the dilution concentration is 0.6%, and then injecting the diluted oil displacement agent A into the position of a perforation section of the water injection well through a microsphere pump;
s3, diluting the oil displacement agent B into water, wherein the dilution concentration is 0.5%, and then injecting the diluted oil displacement agent B into the perforation section layer of the water injection well through a microsphere pump;
and S4, diluting the oil displacement agent C into water, wherein the dilution concentration is 0.6%, and then injecting the diluted oil displacement agent C into the perforation section layer of the water injection well through a microsphere pump.
In the embodiment, after oil displacement and oil extraction are carried out on town 325-97 wells of long 8 oil reservoirs in the Changqing oil field through the steps, cumulative injection is carried out on town 325-97 water injection wells for 198 days, 93000kg of diluted oil displacement agent is injected, the pressure is reduced by 0.5Mpa, corresponding to oil well town 305-81, calm 277-9, daily oil increment is 1.73t, and cumulative oil increment is 238.9t, and the method is still effective at present.
Example 3:
the embodiment takes the well group of 311-777 in the long 8 reservoir town 252 and town 311 of the long Qing oilfield in 12 months in 2019 as an example for introduction, and comprises the following steps:
a method for improving the recovery ratio of crude oil by integrating oil displacement and pressure reduction comprises the following steps:
s1, preparing an oil displacement agent, dividing the oil displacement agent into an oil displacement agent A, an oil displacement agent B and an oil displacement agent C, wherein the oil displacement agent comprises cocamidopropyl betaine, a complex scale inhibitor, a swelling reducing agent and a swelling shrinking agent,
the mass fraction of the cocamidopropyl betaine is 70%, the mass fraction of the complexing scale inhibitor is 15%, the mass fraction of the swelling reducing agent is 7%, and the mass fraction of the swelling shrinking agent is 8%;
s2, diluting the oil displacement agent A into water, wherein the dilution concentration is 1.0%, and then injecting the diluted oil displacement agent A into the position of a perforation section of the water injection well through a microsphere pump;
s3, diluting the oil displacement agent B into water, wherein the dilution concentration is 0.9%, and then injecting the diluted oil displacement agent B into the perforation section layer of the water injection well through a microsphere pump;
and S4, diluting the oil displacement agent C into water, wherein the dilution concentration is 1.0%, and then injecting the diluted oil displacement agent C into the perforation section layer of the water injection well through a microsphere pump.
In the embodiment, after oil displacement and oil recovery are performed by using the town 311-777 well group of the long 8 oil reservoir in the Changqing oil field through the steps, the town 311-777 water injection well is injected for 115 days in an accumulated manner, the diluted oil displacement agent is injected for 6900kg, the pressure is reduced by 0.3MPa, and the oil displacement agent corresponds to the town 310-778 oil reservoir, the daily oil increase is 0.16t, and the accumulated oil increase is 14.4 t.
Through the above embodiments, it is demonstrated that the present invention can effectively reduce the pressure of water injection into the formation, perform better water injection and oil displacement, and further improve the recovery ratio of crude oil, and the effect of embodiment 2 is the best by combining the pressure reduction and oil displacement efficiency of the water injection well and the oil production increase of the oil well in the above three embodiments.
The principle of the invention is as follows:
structural substances blocked in stratum channels can be effectively dissolved by injecting oil displacement agents with different concentrations into the water injection well, stable water-soluble compounds are formed, channel blockage is avoided, betaine solution can also rapidly permeate into the structural substances, the structure and the properties are changed, the structural substances are loosened, the dispersed structural substances are further dispersed in the solution in the water injection channel, secondary precipitation of scale removing substances is avoided, and the scale removing effect is guaranteed;
in addition, the cocamidopropyl betaine in the oil displacement agent is a natural plant surfactant, so that the interfacial tension between an oil phase and a displacement water phase can be reduced, the capillary force of an oil film which captures crude oil on rocks can be weakened, the oil film can fall off from the surfaces of the rocks, oil drops are formed and finally enter an oil well, and the purpose of oil displacement is achieved; when the residual crude oil is brought out along with the plant surfactant solution, the pressure of the reservoir of the oil field is reduced at the same time, and further the water injection pressure is reduced.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A method for improving the recovery ratio of crude oil by integrating oil displacement and pressure reduction is characterized by comprising the following steps:
s1, preparing an oil displacement agent, dividing the oil displacement agent into an oil displacement agent A, an oil displacement agent B and an oil displacement agent C, wherein the oil displacement agent comprises cocamidopropyl betaine, a complex scale inhibitor, a swelling reducing agent and a swelling shrinking agent,
70-80% of cocamidopropyl betaine, 10-15% of complexing scale inhibitor, 5-7% of swelling reducing agent and 5-8% of swelling shrinking agent;
s2, diluting the oil displacement agent A into water with the dilution concentration a, and then injecting the diluted oil displacement agent A into the position of a perforation section of the water injection well;
s3, diluting the oil displacement agent B into water with the dilution concentration of B, and then injecting the diluted oil displacement agent B into the position of a perforation section of the water injection well;
s4, diluting the oil displacement agent C into water with the dilution concentration a, and then injecting the diluted oil displacement agent C into the position of a perforation section of the water injection well;
wherein b is a-0.1%.
2. The method according to claim 1, wherein a in step S4 is 0.3-1.0%.
3. The method of claim 1, wherein a in step S4 is 0.5-0.6%.
4. The method according to claim 1 or 2, wherein the mass fraction of cocamidopropyl betaine, the mass fraction of the complex scale inhibitor, the mass fraction of the swelling reducing agent and the mass fraction of the swelling reducing agent in step S1 are 75%, 13%, 6% and 6%, respectively.
5. The method of claim 4, wherein the complexing scale inhibitor in step S1 is an organic phosphate, the swelling reducing agent is an organic polycationic salt containing nitrogen, phosphorus and sulfur, and the swelling shrinking agent is ultrafine active inorganic semiconductor particles.
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