CN105781511A - Method for increasing yield of middle and high permeability oil reservoirs - Google Patents
Method for increasing yield of middle and high permeability oil reservoirs Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000035699 permeability Effects 0.000 title claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 186
- 239000007924 injection Substances 0.000 claims abstract description 186
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000004094 surface-active agent Substances 0.000 claims abstract description 71
- 229920000642 polymer Polymers 0.000 claims abstract description 60
- 238000012360 testing method Methods 0.000 claims abstract description 35
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 238000012216 screening Methods 0.000 claims abstract description 14
- 238000011156 evaluation Methods 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims description 33
- 239000004698 Polyethylene Substances 0.000 claims description 14
- -1 polyethylene Polymers 0.000 claims description 14
- 229920000573 polyethylene Polymers 0.000 claims description 14
- 238000006116 polymerization reaction Methods 0.000 claims description 14
- JHJUUEHSAZXEEO-UHFFFAOYSA-M sodium;4-dodecylbenzenesulfonate Chemical compound [Na+].CCCCCCCCCCCCC1=CC=C(S([O-])(=O)=O)C=C1 JHJUUEHSAZXEEO-UHFFFAOYSA-M 0.000 claims description 14
- 230000001419 dependent effect Effects 0.000 claims description 10
- 239000008398 formation water Substances 0.000 claims description 10
- 239000003208 petroleum Substances 0.000 claims description 8
- 229920002401 polyacrylamide Polymers 0.000 claims description 8
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 51
- 238000006073 displacement reaction Methods 0.000 description 7
- 239000002349 well water Substances 0.000 description 7
- 239000003129 oil well Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000158728 Meliaceae Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003876 biosurfactant Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
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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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- 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
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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
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
-
- 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
- E21B43/164—Injecting CO2 or carbonated water
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- Geochemistry & Mineralogy (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a method for increasing the yield of middle and high permeability oil reservoirs. The method specifically comprises the following steps of screening of the oil reservoirs, determination of polymer injection wells and surfactant injection wells of the target oil reservoirs, the injection stage of polymer, the injection stage of a surfactant, the water normal injection stage and the field test effect evaluation stage. The method has the characteristics of being low in investment cost and high in field test recovery rate increase degree, the field test recovery rate is increased by 15% or more, and the input-output ratio is greater than 1:5. The method has the characteristics of being simple in process and high in pertinence and operability. Accordingly, the method can be widely applied to field tests for increasing the yield of the middle and high permeability oil reservoirs.
Description
Technical field
The invention belongs to technical field of tertiary oil recovery, the method being specifically related to the volume increase of a kind of medium to high permeable oil reservoir.
Background technology
Fast development along with China's economy, the demand of oil is increased day by day, the shortage of oil is increasingly severe, and at present crude oil in China recovery percent of reserves less than 40%, remaining recoverable oil reserves is huge, particularly medium to high permeable oil reservoir, according to statistics, medium to high permeable oil reservoir resource accounts for more than the 60% of total resources, and medium to high permeable oil reservoir, through long-term waterflooding development, has arrived high water-cut stage middle and late stage, production decline is serious, stable yields difficulty is big, therefore, in the urgent need to the new technology improving medium to high permeable oil recovery.
Medium to high permeable oil reservoir is developed due to long-period water drive, define local macropore, conventional water drive is difficult to improve recovery ratio further, therefore, generally first with polymer, oil reservoir is carried out deep currently for middle and high infiltration oil reservoir enforcement microbial oil displacement and block up tune, after carry out surfactant flooding, utilize deep profile controlling to improve the swept volume of oil reservoir on the one hand, utilize chemical flooding to improve the displacement efficiency of oil reservoir on the other hand.But the method adopts the concurrently injected mode of all wells at test block injection of polymer and surfactant, the oil reservoir of different well correspondence difference permeabilities, therefore, the polymer injecting the relatively low oil reservoir of permeability causes the blocking of such oil reservoir, cause on the one hand the waste of polymer and biosurfactant, on the other hand impact test block entirety recovery ratio degree significantly.
Summary of the invention
A kind of method that it is an object of the invention to provide medium to high permeable oil reservoir to increase production for the deficiencies in the prior art, first the method determines polymer injection well and note surfactant well；Secondly chemical polymerization thing is injected from polymer injection well, reach effective profile control effect；Again, from note surfactant well, chemical surfactant and CO are injected2, the CO of injection2Being effectively improved the swept volume of chemical surfactant, chemical surfactant improves the displacement efficiency of oil reservoir；Finally, from the test all water injection wells of block, inject formation water, improve waterflooding effect further, the feature that the method is pointed and workable, can not only being effectively improved the field test results of medium to high permeable oil reservoir, and can be effectively reduced cost of investment, input-output ratio is high.
The method of a kind of medium to high permeable oil reservoir volume increase, it is characterised in that specifically include following steps:
(1) screening of oil reservoir
The screening criteria of medium to high permeable oil reservoir be reservoir temperature less than 80 DEG C, Reservoir Permeability is more than 1500 × 10-3μm2, viscosity of crude lower than 1200mPa.s and formation water salinity lower than 50000mg/L.
(2) determination of target reservoir polymer injection well and note surfactant well
The water injection well of target reservoir is divided into polymer injection well and note surfactant well by the size according to water injection well injection pressure, the well that water injection pressure is low is polymer injection well, the well that water injection pressure is high is note surfactant well, it is 30～50% that the quantity of polymer injection well accounts for the ratio of total water injection well quantity, and remaining well is note surfactant well.
(3) the injection stage of polymer
Injecting chemical polymerization thing from polymer injection well, the total injection of chemical polymerization thing is 0.01～0.03PV, and the amount of polymer injection well injection chemical polymerization thing accounts for the ratio-dependent of the total water injection rate of polymer injection well according to its water injection rate.
(4) the injection stage of surfactant
The injection stage of polymer injects chemical surfactant and CO after completing from note surfactant well2, the total injection of chemical surfactant is 0.1～0.3PV, and note surfactant well injects the amount of chemical surfactant and accounts for the ratio-dependent of the note total water injection rate of surfactant well, CO according to its water injection rate2Injection rate and chemical surfactant injection rate ratio are gas liquid ratio 5～10:1 under mark condition.
(5) the normal water filling stage
The injection stage of surfactant enters the normal water filling stage after completing, and the water injection rate of every mouthful of water injection well is the water injection rate before test, on-the-spot off-test after normal water filling 12～24 months.
(6) field test results evaluation phase
The normal water filling stage calculates oil increment, improves recovery ratio degree and input-output ratio after completing.
As preferably, the mass concentration of described chemical polymerization thing is 0.1～0.3%, molecular weight is 1～5 × 106。
As preferably, described chemical polymerization thing is polyacrylamide or polyethylene.
As preferably, described chemical surfactant is petroleum sulfonate or dodecylbenzene sodium sulfonate, mass concentration is 0.2～0.5%.
The speed of the normal water filling of described water injection well is 30～200m3/d。
The present invention is directed to the feature of medium to high permeable water-drive pool, water injection well is divided into polymer injection well and note surfactant well；Secondly chemical polymerization thing is injected from polymer injection well, oil reservoir is played effective profile control effect；Again, from note surfactant well, chemical surfactant and CO are injected2, the CO of injection2Being effectively improved the swept volume of chemical surfactant, the chemical surfactant of injection can be effectively improved displacement efficiency；Finally, from the test all water injection wells of block, inject formation water, improve waterflood efficiency further, the feature that the method is pointed and workable, the field test results of medium to high permeable oil reservoir can not only be effectively improved, improve recovery ratio more than 15%；And the consumption of chemical polymerization thing and chemical surfactant can be efficiently reduced, cost of investment is less significantly, and input-output ratio is high, more than 1:5.
The medicine have the advantages that
(1) present invention have that technique is simple, specific aim and workable feature, be conducive to field popularization application；
(2) the oil reservoir scope that the present invention is suitable for is wide, is applicable not only to middle and high infiltration water-drive pool, is equally applicable to higher temperature reservoirs；
(3) present invention adopts part well to inject chemical polymerization thing and the method for another part well injection chemical surfactant, the method can give full play to the respective profile control of injecting and washing oil function, the consumption of injecting can be effectively saved again, the degree that on-the-spot test simultaneously improves recovery ratio is high, on-the-spot test improves recovery ratio more than 15%, and input-output ratio is more than 1:5.
Detailed description of the invention
Below in conjunction with specific embodiment, and with reference to data, the present invention is described in further detail.Should be understood that these embodiments present invention solely for the purpose of illustration, but not the scope being intended to limit the present invention in any manner.
Embodiment 1
Certain oil field block D, reservoir temperature 68 DEG C, reservoir pressure 11.3MPa, porosity 38.9%, pore volume 7.2 × 104m3, permeability 2700 × 10-3μm2, oil in place 3.5 × 104T, ground viscosity of crude 1150mPa.s, formation water salinity is 15680mg/L, and block on average moisture 96.3% before test, oil well 12 mouthfuls, 6 mouthfuls of well, well water injection pressure and daily water-injection rate are in Table 1.The method utilizing the present invention implements on-the-spot oil displacement test at block D, is embodied as step as follows:
The water injection pressure of table 1 block D well and daily water-injection rate
(1) screening of oil reservoir
The screening criteria of oil reservoir be reservoir temperature less than 80 DEG C, Reservoir Permeability is more than 1500 × 10-3μm2, viscosity of crude lower than 1200mPa.s and formation water salinity lower than 50000mg/L, block D meets the screening criteria of oil reservoir, it is possible to implement the present invention at this block.
(2) determination of target reservoir polymer injection well and note surfactant well
The water injection well of target reservoir is divided into polymer injection well and note surfactant well by the size according to injection pressure, the well that water injection pressure is low is polymer injection well, the well that water injection pressure is high is note surfactant well, it is 50% that the quantity of polymer injection well accounts for the ratio of total water injection well quantity, it is 3 mouthfuls, respectively D2、D4And D6, the quantity of note surfactant well is 3 mouthfuls, respectively D1、D3And D5。
(3) the injection stage of polymer
Injecting polyacrylamide from polymer injection well, polyacrylamide molecular weight is 1～2 × 106, the mass concentration of polyacrylamide is 0.1%, the total injection of polyacrylamide is 0.01PV, for 720m3, the amount of polymer injection well injection polyacrylamide accounts for the ratio-dependent of the total water injection rate of polymer injection well, D according to its water injection rate2、D4And D6Well water injection rate accounts for the total water injection rate 330m of polymer injection well3Ratio respectively 95/330=28.8%, 110/330=33.3%, 125/330=37.9%, D2、D4And D6The amount respectively 720 × 28.8%=207.3m of well note polyacrylamide3, 720 × 33.3%=239.8m3With 720 × 37.9%=272.9m3。
(4) the injection stage of surfactant
The injection stage of polymer injects petroleum sulfonate and CO after completing from note surfactant well2, petroleum sulfonate mass concentration is 0.2%, and the total injection of petroleum sulfonate is 0.2PV, is 1.44 × 104m3, the amount of polymer injection well injection petroleum sulfonate accounts for the ratio-dependent of the total water injection rate of polymer injection well, D according to its water injection rate1、D3And D5Well water injection rate accounts for the note total water injection rate 186m of mahogany acid salt well3Ratio respectively 72/186=38.7%, 46/186=24.7% and 68/186=36.6%, D1、D3And D5The amount respectively 1.44 × 10 of well note petroleum sulfonate4× 38.7%=5573m3、1.44×104× 24.7%=3557m3With 1.44 × 104× 36.6%=5270m3, CO2The injection rate ratio of injection rate and petroleum sulfonate is gas liquid ratio 5:1, D under mark condition1、D3And D5Well injects CO2Amount respectively 2.7865 × 104Nm3(mark side), 1.7785 × 104Nm3With 2.635 × 104Nm3。
(5) the normal water filling stage
The injection stage of surfactant enters normal water filling stage, D after completing1、D2、D3、D4、D5、D6The water injection rate of well is the water injection rate before test, respectively 72m3、95m3、46m3、110m3、68m3And 125m3, on-the-spot off-test after normal water filling 18 months.
(6) field test results evaluation phase
The normal water filling stage adds up to increase oil 0.55 × 10 after completing4T, improves recovery ratio 15.7%, and input-output ratio is 1:5.8, moisture have dropped 9.0 percentage points, and the present invention achieves obvious field test results at this block.
Embodiment 2
Certain oil field block E, reservoir temperature 73 DEG C, reservoir pressure 13.5MPa, porosity 39.2%, pore volume 9.0 × 104m3, permeability 3200 × 10-3μm2, oil in place 4.5 × 104T, ground viscosity of crude 1020mPa.s, formation water salinity is 8650mg/L, and block on average moisture 98.3% before test, oil well 8 mouthfuls, 5 mouthfuls of well, well daily water-injection rate and water injection pressure are in Table 2.The method utilizing the present invention implements on-the-spot oil displacement test at block B, is embodied as step as follows:
The water injection pressure of table 2 block E well and daily water-injection rate
(1) screening of oil reservoir
The screening criteria of oil reservoir be reservoir temperature less than 80 DEG C, Reservoir Permeability is more than 1000 × 10-3μm2, viscosity of crude lower than 1200mPa.s and formation water salinity lower than 50000mg/L, block E meets the screening criteria of oil reservoir, it is possible to this block implements the present invention.
(2) determination of target reservoir polymer injection well and note surfactant well
The water injection well of target reservoir is divided into polymer injection well and note surfactant well by the size according to injection pressure, the well that water injection pressure is low is polymer injection well, the well that water injection pressure is high is note surfactant well, it is 40% that the quantity of polymer injection well accounts for the ratio of total water injection well quantity, it is 2 mouthfuls, respectively E1And E4, the well quantity of note surfactant is 3 mouthfuls, respectively E2、E3And E5。
(3) the injection stage of polymer
Injecting polyethylene from polymer injection well, molecular weight of polyethylene is 3～5 × 106, the mass concentration of polyethylene is 0.3%, the total injection of polyethylene is 0.03PV, for 2700m3, the amount of polymer injection well injection polyethylene accounts for the ratio-dependent of the total water injection rate of polymer injection well, E according to its water injection rate1And E4Well water injection rate accounts for the total water injection rate 220m of polymer injection well3Ratio respectively 120/220=54.5%, 100/220=45.5%, E1And E4The amount respectively 2700 × 54.5%=1472m of well note polyethylene3With 2700 × 45.5%=1228m3。
(4) the injection stage of surfactant
The injection stage of polymer injects dodecylbenzene sodium sulfonate and CO after completing from note surfactant well2, dodecylbenzene sodium sulfonate mass concentration is 0.5%, and the total injection of dodecylbenzene sodium sulfonate is 0.10PV, is 9.0 × 103m3, note surfactant well injects the amount of dodecylbenzene sodium sulfonate and accounts for the ratio-dependent of the note total water injection rate of surfactant well, E according to its water injection rate2、E3And E5Well water injection rate accounts for the note total water injection rate 210m of surfactant well3Ratio respectively 70/210=33.3%, 90/210=42.9% and 50/210=23.8%, E2、E3And E5The amount respectively 9.0 × 10 of well note dodecylbenzene sodium sulfonate3× 33.3%=2997m3、9.0×103× 42.9%=3861m3With 9.0 × 103× 23.8%=2142m3, CO2The injection rate ratio of injection rate and dodecylbenzene sodium sulfonate is gas liquid ratio 10:1, E under mark condition2、E3And E5Well injects CO2Amount respectively 2.997 × 104Nm3、3.861×104Nm3With 2.142 × 104Nm3。
(5) the normal water filling stage
The injection stage of surfactant enters normal water filling stage, E after completing1、E2、E3、E4、E5The water injection rate of well is the water injection rate before test, respectively 120m3、70m3、90m3、100m3And 50m3, on-the-spot off-test after normal water filling 24 months.
(6) field test results evaluation phase
The normal water filling stage adds up to increase oil 0.80 × 10 after completing4T, improves recovery ratio 17.8%, and input-output ratio is 1:6.2, moisture have dropped 10.3 percentage points, and the present invention achieves obvious field test results at this block.
Embodiment 3
Certain oil field block G, reservoir temperature 55 DEG C, reservoir pressure 13.2MPa, porosity 37.2%, pore volume 6.5 × 104m3, permeability 2600 × 10-3μm2, oil in place 3.8 × 104T, ground viscosity of crude 850mPa.s, formation water salinity is 7560mg/L, and block on average moisture 96.3% before test, oil well 15 mouthfuls, 7 mouthfuls of well, well daily water-injection rate and water injection pressure are in Table 3.The method utilizing the present invention implements on-the-spot oil displacement test at block G, is embodied as step as follows:
The day water yield and water injection pressure of table 3 block G well
(1) screening of oil reservoir
The screening criteria of oil reservoir be reservoir temperature less than 80 DEG C, Reservoir Permeability is more than 1000 × 10-3μm2, viscosity of crude lower than 1200mPa.s and formation water salinity lower than 50000mg/L, block G meets the screening criteria of oil reservoir, it is possible to implement the present invention at this block.
(2) determination of target reservoir polymer injection well and note surfactant well
The water injection well of target reservoir is divided into polymer injection well and note surfactant well by the size according to injection pressure, the well that water injection pressure is low is polymer injection well, the well that water injection pressure is high is note surfactant well, it is 30% that the quantity of polymer injection well accounts for the ratio of total water injection well quantity, it is 2 mouthfuls, respectively G3And G5, note surfactant well quantity is 5 mouthfuls, respectively G1、G2、G4、G6And G7。
(3) the injection stage of polymer
Injecting polyethylene from polymer injection well, molecular weight of polyethylene is 2～3 × 106, the mass concentration of polyethylene is 0.2%, the total injection of polyethylene is 0.02PV, for 1300m3, the amount of polymer injection well injection polyethylene accounts for the ratio-dependent of the total water injection rate of polymer injection well, G according to its water injection rate3And G5Well water injection rate accounts for the total water injection rate 250m of polymer injection well3Ratio respectively 130/250=52.0% and 120/250=48.0%, G3And G5The amount respectively 1300 × 52.0%=676m of well note polyethylene3With 1300 × 48.0%=624m3。
(4) the injection stage of surfactant
The injection stage of polymer injects dodecylbenzene sodium sulfonate and CO after completing from note surfactant well2, dodecylbenzene sodium sulfonate mass concentration is 0.3%, and the total injection of dodecylbenzene sodium sulfonate is 0.3PV, is 1.95 × 104m3, note surfactant well injects the amount of dodecylbenzene sodium sulfonate and accounts for the ratio-dependent of the note total water injection rate of surfactant well, G according to its water injection rate1、G2、G4、G6And G7Well water injection rate accounts for the note total water injection rate 405m of surfactant well3Ratio respectively 60/405=14.8%, 105/405=25.9%, 80/405=19.8%, 90/405=22.2% and 70/405=17.3%, G1、G2、G4、G6And G7The amount respectively 1.95 × 10 of well note dodecylbenzene sodium sulfonate4× 14.8%=2886m3、1.95×104× 25.9%=5050m3、1.95×104× 19.8%=3861m3、1.95×104× 22.2%=4329m3With 1.95 × 104× 17.3%=3374m3, CO2The injection rate ratio of injection rate and dodecylbenzene sodium sulfonate is gas liquid ratio 8:1, G under mark condition1、G2、G4、G6And G7Well injects CO2Amount respectively 2.31 × 104Nm3、4.04×104Nm3、3.09×104Nm3、3.46×104Nm3With 2.70 × 104Nm3。
(5) the normal water filling stage
The injection stage of surfactant enters normal water filling stage, G after completing1、G2、G3、G4、G5、G6And G7The water injection rate of well is the water injection rate before test, respectively 60m3、105m3、130m3、80m3、120m3、 90m3And 70m3, on-the-spot off-test after normal water filling 12 months.
(6) field test results evaluation phase
The normal water filling stage adds up to increase oil 0.62 × 10 after completing4T, improves recovery ratio 16.3%, and input-output ratio is 1:7.3, moisture have dropped 12.8 percentage points, and the present invention achieves obvious field test results at this block.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when without departing substantially from the spirit of the present invention or basic feature, it is possible to realize the present invention in other specific forms.Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the invention rather than described above limits, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in the present invention.
In addition, it is to be understood that, although this specification is been described by according to embodiment, but not each embodiment only comprises an independent technical scheme, this narrating mode of description is only for clarity sake, description should be made as a whole by those skilled in the art, and the technical scheme in each embodiment through appropriately combined, can also form other embodiments that it will be appreciated by those skilled in the art that.
Claims (4)
1. the method for a medium to high permeable oil reservoir volume increase, it is characterised in that specifically include following steps:
(1) screening of oil reservoir
The screening criteria of medium to high permeable oil reservoir be reservoir temperature less than 80 DEG C, Reservoir Permeability is more than 1500 × 10-3μm2, viscosity of crude lower than 1200mPa.s and formation water salinity lower than 50000mg/L；
(2) determination of target reservoir polymer injection well and note surfactant well
The water injection well of target reservoir is divided into polymer injection well and note surfactant well by the size according to water injection well injection pressure, the well that water injection pressure is low is polymer injection well, the well that water injection pressure is high is note surfactant well, it is 30～50% that the quantity of polymer injection well accounts for the ratio of total water injection well quantity, and remaining well is note surfactant well；
(3) the injection stage of polymer
Injecting chemical polymerization thing from polymer injection well, the total injection of chemical polymerization thing is 0.01～0.03PV, and the amount of polymer injection well injection chemical polymerization thing accounts for the ratio-dependent of the total water injection rate of polymer injection well according to its water injection rate；
(4) the injection stage of surfactant
The injection stage of polymer injects chemical surfactant and CO after completing from note surfactant well2, the total injection of chemical surfactant is 0.1～0.3PV, and note surfactant well injects the amount of chemical surfactant and accounts for the ratio-dependent of the note total water injection rate of surfactant well, CO according to its water injection rate2Injection rate and chemical surfactant injection rate ratio are gas liquid ratio 5～10:1 under mark condition；
(5) the normal water filling stage
The injection stage of surfactant enters the normal water filling stage after completing, and the water injection rate of every mouthful of water injection well is the water injection rate before test, on-the-spot off-test after normal water filling 12～24 months；
(6) field test results evaluation phase
The normal water filling stage calculates oil increment, improves recovery ratio degree and input-output ratio after completing.
2. the method for a kind of medium to high permeable oil reservoir according to claim 1 volume increase, it is characterised in that the mass concentration of described chemical polymerization thing is 0.1～0.3%, molecular weight is 1～5 × 106。
3. the method for a kind of medium to high permeable oil reservoir according to claim 2 volume increase, it is characterised in that described chemical polymerization thing is polyacrylamide or polyethylene.
4. the method for a kind of medium to high permeable oil reservoir according to claim 1 volume increase, it is characterised in that described chemical surfactant is petroleum sulfonate or dodecylbenzene sodium sulfonate, mass concentration is 0.2～0.5%.
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