CN114427376B - Method for enhancing lateral drive between wells of large-bottom water reservoir - Google Patents
Method for enhancing lateral drive between wells of large-bottom water reservoir Download PDFInfo
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- CN114427376B CN114427376B CN202011002770.1A CN202011002770A CN114427376B CN 114427376 B CN114427376 B CN 114427376B CN 202011002770 A CN202011002770 A CN 202011002770A CN 114427376 B CN114427376 B CN 114427376B
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- 238000000034 method Methods 0.000 title claims abstract description 18
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- 238000002347 injection Methods 0.000 claims abstract description 61
- 239000007924 injection Substances 0.000 claims abstract description 61
- 238000006073 displacement reaction Methods 0.000 claims abstract description 58
- 241000237858 Gastropoda Species 0.000 claims abstract description 25
- 239000003129 oil well Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 238000005192 partition Methods 0.000 claims abstract description 14
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000011148 porous material Substances 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 6
- 230000035699 permeability Effects 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 51
- 229920000642 polymer Polymers 0.000 claims description 32
- 239000008398 formation water Substances 0.000 claims description 14
- 230000000903 blocking effect Effects 0.000 claims description 10
- 239000003431 cross linking reagent Substances 0.000 claims description 8
- 238000009472 formulation Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000012752 auxiliary agent Substances 0.000 claims description 6
- 239000010779 crude oil Substances 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 4
- 230000005465 channeling Effects 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 1
- 230000002195 synergetic effect Effects 0.000 claims 1
- 230000009044 synergistic interaction Effects 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 239000002981 blocking agent Substances 0.000 description 3
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
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- 239000007788 liquid Substances 0.000 description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/588—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 polymers
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- 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
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
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Abstract
The invention provides a method for enhancing lateral drive between wells of a large-bottom water reservoir, which comprises the following steps: s1, establishing a three-dimensional bottom water oil reservoir physical model device according to the relative thickness of a stratum and an oil layer where an oil well to be displaced is located, the distance between wells and the relative size of bottom water parameters, and calculating the dosage of a plugging agent; s2, designing a partition board slug, a displacement slug and a displacement slug, and calculating the total injection amount according to the pore volume of the oil reservoir; s3, according to the production pressure gradient and the injection ratio and the stratum permeability, the injection pressure value and the injection displacement of the three-section water plugging plug are respectively calculated by combining the plugging agent dosage calculated in the step S1 and the injection total amount calculated in the step S2 according to the pore volume of the oil reservoir; s4, sequentially injecting three sections of water plugging slugs into the stratum of the oil well to be displaced according to the calculated injection displacement for displacement construction. According to the invention, by combining the front partition plate and the lateral displacement technology, the efficient displacement of the residual oil among the wells is realized, the use of the residual oil among the wells is improved, and the later recovery ratio is greatly improved.
Description
Technical Field
The invention relates to the technical field of petroleum development, in particular to a method for enhancing lateral drive between wells of a large-bottom water reservoir.
Background
The clastic rock oil reservoir of the tower river has the characteristics of 'one super three high': ultra-deep (4200-5100 m), high temperature (90-137 ℃), high salt (total mineralization degree of stratum water 21 x10 4 mg/L, calcium-magnesium particle content 1.2 x10 4 mg/L), and high water-oil system ratio (above 500). With the development of oil reservoirs, as the heterogeneity of the oil reservoirs is strong, the bottom water coning in the development process of clastic rock bottom water oil reservoirs of the tower river oil fields causes serious flooding of the oil wells, and the residual oil is mainly distributed in the seepage sections of wells Zhou Di, the high parts of the oil reservoirs and the inter-well control areas. In the early stage, the bottom water is controlled mainly by adopting an oil well water blocking mode, the potential of residual oil around the well is excavated, but the water blocking effect is rapidly deteriorated after water blocking is performed for a plurality of times. The later recovery ratio direction gradually turns to the well to dig out the residual oil at the top and between wells, but the conventional three-production technology cannot be applied due to the severe oil reservoir conditions.
For example, the paper (Jiuj4 area bottom water reservoir artificial partition board water shutoff technology research, southwest petroleum university [ D ], 2016) combines the geological features of the reservoir with the current development situation, and provides a urea-formaldehyde resin plugging agent system artificial partition board water shutoff technology suitable for the reservoir. The artificial baffle water blocking technology is an effective chemical water blocking control method for coning bottom water, can block coning of bottom water to an oil well, change the seepage direction of the bottom water around a shaft and achieve the effect of dewatering and increasing oil. The urea-formaldehyde resin plugging agent system has the characteristics of low initial viscosity, good injectability and high plugging strength after solidification, has the functions of sand prevention and sand fixation, and has certain applicability to a target oil reservoir. An artificial partition plugging agent system suitable for a nine-4-zone bottom water reservoir is optimized through experiments, and the performance of the plugging agent system is evaluated.
As the technology disclosed in the paper above, most of the prior art is single well residual oil at the earlier stage is dug, the potential of residual oil around the well is dug, and no effective treatment means exist at present for enriching residual oil among bottom water reservoirs during later recovery.
Disclosure of Invention
The invention provides a method for enhancing the lateral drive between wells of a large bottom water oil reservoir, which aims to solve the problem that the enrichment of residual oil between wells of the bottom water oil reservoir in the later harvest is lack of effective treatment means in the prior art.
The technical scheme of the invention is as follows:
the method for enhancing the lateral drive between wells of the large-bottom water reservoir is characterized by comprising the following steps of:
s1, establishing a three-dimensional bottom water reservoir physical model device according to the relative thickness of a stratum and an oil layer where an oil well to be displaced is located, the distance between wells and the relative size of bottom water parameters, and calculating the dosage of a plugging agent;
S2, designing a partition board slug, a displacement slug and a displacement slug, and calculating the total injection amount according to the pore volume of the oil reservoir; the separator slug adopts a first-strength micro-mucus system, the displacement slug adopts a second-strength micro-mucus system, the viscosity of the first-strength micro-mucus system and the viscosity of the second-strength micro-mucus system are both larger than that of crude oil, the first strength is higher than the second strength, and the displacement slug samples formation water;
S3, according to the production pressure gradient and the injection ratio and the stratum permeability, the injection pressure value and the injection displacement of the three-section water plugging plug are respectively calculated by combining the plugging agent dosage calculated in the step S1 and the injection total amount calculated in the step S2 according to the pore volume of the oil reservoir;
S4, sequentially injecting three sections of water plugging slugs into the stratum of the oil well to be displaced according to the calculated injection displacement for displacement construction, wherein the partition slugs are injected into an oil-water interface to spread and solidify so as to block bottom water, and the displacement slugs are laterally displaced above the partition slugs through a lateral displacement technology so as to drive residual oil between large bottom water oil reservoirs.
Preferably, the injection amount of the separator slugs calculated in the step S3 is 55-65% of the total injection amount, and the injection amount of the displacement slugs is 28-43% of the total injection amount; the injection amount of the displacement slug is 4-8% of the total injection amount.
Preferably, the first strength micro-mucus system and the second strength micro-mucus system in the step S2 comprise polymers, a cross-linking agent, an auxiliary agent and formation water, wherein the polymers are high-temperature resistant and high-salt resistant polymers, any one of AP-P3 polymers, AM-AMPS polymers or other salt resistant polymers is adopted, and the cross-linking agent is ZX-1; the auxiliary agent is LGY.
Preferably, the first-strength micro-mucus system and the second-strength micro-mucus system in the step S2 belong to a micro-mucus system, and the formula of each component is as follows: 0.2-0.3% polymer, 0.05-0.075% ZX-1, 0.05-0.5% LGY, and the balance of stratum water; the polymer proportion and the auxiliary agent proportion of the first-strength micro-mucus system are higher than those of the second-strength micro-mucus system.
Preferably, the formulation of the first strength micro-mucus system is: 0.3% of polymer, 0.05% of ZX-1, 0.5% of LGY and the balance of formation water, wherein the first-strength micro-mucus system is used for blocking bottom water and realizing channeling and plugging;
The formula of the second-strength micro-mucus system is 0.2% of polymer, 0.05% of ZX-1, 0.05% of LGY and the balance of formation water, and the second-strength micro-mucus system is used for tackifying displacement and driving residual oil among large-bottom water reservoir wells.
Preferably, the blocking agent dosage calculated in the step S1 is the total dosage of the first strength micro-mucus system and the second strength micro-mucus system, and the total dosage of the first strength micro-mucus system and the second strength micro-mucus system is 0.3-0.4 PV oil layer.
Preferably, the total amount of the first and second strength micro-mucus systems is 0.3PV oil layer.
Preferably, both the first and second strength micro-mucus systems are injected and produced in step S4.
The beneficial effects of the invention are as follows:
aiming at the problems that residual oil between bottom water reservoir wells is enriched and no effective treatment means exists, the invention develops a front baffle plate and lateral water drive technology research, a three-dimensional bottom water reservoir physical model device is built, and after the dosage of a blocking agent is calculated, three sections of water blocking slugs are designed. After the high-strength micro-viscous liquid system is injected, an obvious baffle plate can be formed at an oil-water interface due to the difference of fluidity, injected water is forced to be diverted to displace an upper oil layer of bottom water, the utilization of residual oil between wells is improved, and the recovery condition is obviously better than that of nitrogen injection foam and nitrogen injection.
Drawings
FIG. 1 is a flow chart of the method for enhancing the lateral drive between wells of a large-bottom water reservoir.
FIG. 2 is a construction schematic diagram of the method for enhancing the lateral drive between wells of a large-bottom water reservoir.
Detailed Description
For a clearer understanding of the content of the invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
The invention relates to a method for enhancing lateral drive between wells of a large-bottom water reservoir, which is shown in a figure 1 and comprises the following steps: s1, establishing a three-dimensional bottom water reservoir physical model device according to the relative thickness of a stratum and an oil layer where an oil well to be displaced is located, the distance between wells and the relative size of bottom water parameters, and calculating the dosage of a plugging agent; s2, designing a partition board slug, a displacement slug and a displacement slug, and calculating the total injection amount according to the pore volume of the oil reservoir; the separator slug adopts a first-strength micro-mucus system, the displacement slug adopts a second-strength micro-mucus system, the viscosities of the first-strength micro-mucus system and the second-strength micro-mucus system are both larger than the viscosity of crude oil, the first strength is higher than the second strength, and the displacement slug samples stratum water; s3, according to the production pressure gradient and the injection ratio and the stratum permeability, the injection pressure value and the injection displacement of the three-section water plugging plug are respectively calculated by combining the plugging agent dosage calculated in the step S1 and the injection total amount calculated in the step S2 according to the pore volume of the oil reservoir; s4, sequentially injecting three sections of water plugging slugs into the stratum of the oil well to be displaced according to the calculated injection displacement, and performing displacement construction, wherein the bulkhead slugs are injected into an oil-water interface to spread and solidify to form a bulkhead 1 so as to block bottom water, and the displacement slugs are laterally displaced above the bulkhead slugs (a lateral channel 2 shown in fig. 2) through a lateral displacement technology so as to drive residual oil between large bottom water reservoir wells. That is, after the high-strength micro-viscous liquid system is injected, due to the difference of fluidity, an obvious baffle plate 1 can be formed at the oil-water interface, so that the injected water is forced to be diverted to displace the upper oil layer of the large-bottom water, and the utilization of residual oil between wells is improved. According to the invention, by combining the front partition plate and the lateral displacement technology, the efficient displacement of the residual oil among the wells is realized, the use of the residual oil among the wells is improved, and the later recovery ratio is greatly improved.
Further preferably, the blocking agent calculated in step S1 is used in a total amount of the first and second intensity micro-mucus systems, the total amount of the first and second intensity micro-mucus systems being in the range of 0.3 to 0.4PV oil layer, further preferably in the range of 0.3PV oil layer.
The total injection amount calculated in the step S2 is the amount of displacement slug formation water based on the total amount of the first-intensity micro-mucus system and the second-intensity micro-mucus system calculated in the step S1; s3, respectively calculating injection displacement of three sections of water blocking slugs, and further, calculating the injection quantity of the partition plate slugs which is 55-65% of the total injection quantity, wherein the injection quantity of the displacement slugs is 28-43% of the total injection quantity; the injection amount of the displacement slug is 4-8% of the total injection amount.
The three-section water plugging slugs are a baffle slug, a displacement slug and a displacement slug respectively, and preferably, a first-strength micro-mucus system adopted by the baffle slug and a second-strength micro-mucus system adopted by the displacement slug belong to the micro-mucus system, the viscosity of the micro-mucus system is slightly higher than that of crude oil, the viscosity of the crude oil is 2 mPa.S, and the viscosity of the micro-mucus system can be 5 mPa.S.
Preferably, the micro-mucus system comprises a polymer, a cross-linking agent, an auxiliary agent and formation water, wherein the polymer is a high-temperature resistant and high-salt resistant polymer, any one of an AP-P3 polymer, an AM-AMPS polymer or other salt resistant polymers can be selected, and the cross-linking agent is preferably ZX-1; the adjuvant is preferably LGY. The formulation of each component in the micro-mucus system is as follows: 0.2-0.3% polymer, 0.05-0.075% ZX-1, 0.05-0.5% LGY, and the balance of stratum water; the formula of each component of the first-strength micro-mucus system is higher than that of the second-strength micro-mucus system, and the polymer proportion and the additive proportion of the first-strength micro-mucus system are higher than those of the second-strength micro-mucus system, so that the proportion of the cross-linking agent of the first-strength micro-mucus system and the second-strength micro-mucus system is the same. The first strength is higher than the second strength, i.e. the first strength micro-mucus system may also be referred to as a high strength micro-mucus system, and the second strength micro-mucus system may also be referred to as a low strength micro-mucus system, i.e. the separator slugs employ a high strength micro-mucus system and the displacement slugs employ a low strength micro-mucus system, where high strength and low strength are both relative.
Still further, the formulation of the first strength micro-mucus system is: 0.3% of polymer, 0.05% of ZX-1, 0.5% of LGY and the balance of formation water, wherein the first-strength micro-mucus system is used for blocking bottom water and realizing channeling and plugging. The formula of the second-strength micro-mucus system is 0.2% of polymer, 0.05% of ZX-1, 0.05% of LGY and the balance of formation water, and the second-strength micro-mucus system is used for tackifying and displacing to drive residual oil between large-bottom water reservoir wells.
It should be noted that the above formulation is only a preferred embodiment, and the formulations of the components of the first strength micro-mucus system and the second strength micro-mucus system may be appropriately adjusted.
Furthermore, the invention relates to a method for enhancing lateral drive between wells of a large-bottom water reservoir, wherein oil well injection and oil well production are adopted in the step S4 by a first-strength micro-mucus system and a second-strength micro-mucus system. This is also a substantial distinction from existing displacement concepts that employ well injection and well production.
Taking a Tahe TK202H well as an example, the specific steps are as follows:
s1, establishing a three-dimensional bottom water reservoir physical model device according to the relative thickness of a stratum oil layer where an oil well to be displaced is located, the distance between wells and the relative size of bottom water parameters, calculating the dosage of a plugging agent, and preparing the plugging agent;
S1A, according to a formula: 0.3% of polymer, 0.05% of ZX-1, 0.5% of LGY and the balance of formation water, and stirring to prepare a high-strength micro-mucus system;
S1B, stirring and preparing a low-strength micro-mucus system according to a formula of 0.2% polymer, 0.05% ZX-1, 0.05% LGY and the balance of formation water;
s2, designing a three-section water plugging slug, and designing and injecting an oil layer with total injection amount of 0.3PV according to the pore volume of the oil reservoir;
s3, designing injection pressure values and injection displacement of the plugging agent according to the production pressure gradient, the injection ratio and the stratum permeability;
s4, sequentially carrying out displacement construction on stratum of the oil well to be displaced according to the injection of the three-section water plugging slugs;
S4A, injecting a high-strength micro-mucus system, namely a baffle slug, into the stratum, wherein the injection amount of the high-strength micro-mucus system is 60% of the injection total amount;
S4B, injecting a low-strength micro-mucus system, namely a displacement slug, into the stratum, wherein the injection amount of the displacement slug is 35% of the injection total amount;
S4C, injecting stratum water, namely a displacement slug, into the stratum, wherein the injection amount of the displacement slug is 5% of the injection total amount;
Through two stages of trial injection and formalization, the total quantity of the injected medicament is 8677, wherein: the low-strength micro-mucus (namely the second-strength micro-mucus system adopted by the displacement slug is also called as a low-strength micro-mucus system) 3197 square, the high-strength micro-mucus (namely the first-strength micro-mucus system adopted by the baffle slug is also called as a high-strength micro-mucus system) 5480 square, and the highest pressure is 24.3MPa, so that the recovery ratio is improved by 14%.
It should be noted that the above-described embodiments will enable those skilled in the art to more fully understand the invention, but do not limit it in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that the present invention may be modified or equivalent, and in all cases, all technical solutions and modifications which do not depart from the spirit and scope of the present invention are intended to be included in the scope of the present invention.
Claims (6)
1. The method for enhancing the lateral drive between wells of the large-bottom water reservoir is characterized by comprising the following steps of:
s1, establishing a three-dimensional bottom water reservoir physical model device according to the relative thickness of a stratum and an oil layer where an oil well to be displaced is located, the distance between wells and the relative size of bottom water parameters, and calculating the dosage of a plugging agent;
S2, designing a partition board slug, a displacement slug and a displacement slug, and calculating the total injection amount according to the pore volume of the oil reservoir; the separator slug adopts a first-strength micro-mucus system, the displacement slug adopts a second-strength micro-mucus system, the viscosity of the first-strength micro-mucus system and the viscosity of the second-strength micro-mucus system are both larger than that of crude oil, the first strength is higher than the second strength, and the displacement slug samples formation water; the first strength micro-mucus system and the second strength micro-mucus system belong to a micro-mucus system, the micro-mucus systems comprise polymers, a cross-linking agent, an auxiliary agent and formation water, the polymers are high-temperature resistant and high-salt resistant polymers, any one of an AP-P3 polymer, an AM-AMPS polymer or other salt resistant polymers is adopted, the cross-linking agent is ZX-1, and the auxiliary agent is LGY; the formulation of each component in the micro-mucus system is as follows: 0.2 to 0.3 percent of polymer, 0.05 to 0.075 percent of ZX-1,0.05 to 0.5 percent of LGY and the balance of stratum water; the formula of each component of the first-strength micro-mucus system is compared with that of the second-strength micro-mucus system, the polymer proportion and the additive proportion of the first-strength micro-mucus system are higher than those of the second-strength micro-mucus system, and the proportion of the cross-linking agent of the first-strength micro-mucus system and the second-strength micro-mucus system is the same;
S3, according to the production pressure gradient and the injection ratio, the stratum permeability is combined with the plugging agent consumption calculated in the step S1 and the injection total amount calculated in the step S2 according to the oil reservoir pore volume, and the injection pressure value and the injection displacement of the three-section water plugging slug are calculated respectively;
S4, sequentially injecting three sections of water plugging slugs into the stratum of the oil well to be displaced according to the calculated injection displacement for displacement construction, wherein the partition slugs are injected into an oil-water interface to spread and solidify so as to block bottom water, and the displacement slugs are laterally displaced above the partition slugs through a lateral displacement technology so as to drive residual oil between large bottom water oil reservoirs.
2. The method for enhancing the lateral drive between wells of a large bottom water reservoir according to claim 1, wherein the injection amount of the separator slugs calculated in the step S3 is 55-65% of the total injection amount, and the injection amount of the displacement slugs is 28-43% of the total injection amount; the injection amount of the displacement slug is 4-8% of the total injection amount.
3. The method of synergistic interaction for well-to-well flooding of large bottom water reservoirs of claim 1, wherein the formulation of the first strength micro-viscous fluid system is: 0.3% of polymer, 0.05% of ZX-1, 0.5% of LGY and the balance of formation water, wherein the first-strength micro-mucus system is used for blocking bottom water and realizing channeling and plugging;
The formula of the second-strength micro-mucus system is 0.2% of polymer, 0.05% of ZX-1, 0.05% of LGY and the balance of formation water, and the second-strength micro-mucus system is used for tackifying displacement and driving residual oil among large-bottom water reservoir wells.
4. The method for enhancing the lateral drive between wells of a large-bottom water reservoir according to claim 1, wherein the amount of the plugging agent calculated in the step S1 is the total amount of the first-intensity micro-mucus system and the second-intensity micro-mucus system, and the total amount of the first-intensity micro-mucus system and the second-intensity micro-mucus system is 0.3-0.4 PV oil layer.
5. The method of synergistic well-to-well drive of large bottom water reservoirs of claim 4, in which the total amount of the first and second strength micro-mucus systems is 0.3PV reservoir.
6. The method for enhancing the lateral drive between wells of a large bottom water reservoir according to claim 4, wherein the first strength micro-mucus system and the second strength micro-mucus system are both oil well injection and oil well production in the step S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002770.1A CN114427376B (en) | 2020-09-22 | 2020-09-22 | Method for enhancing lateral drive between wells of large-bottom water reservoir |
Applications Claiming Priority (1)
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