CN106050209A - Method for improving yield of low-permeability heavy oil well - Google Patents
Method for improving yield of low-permeability heavy oil well Download PDFInfo
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- CN106050209A CN106050209A CN201610474056.XA CN201610474056A CN106050209A CN 106050209 A CN106050209 A CN 106050209A CN 201610474056 A CN201610474056 A CN 201610474056A CN 106050209 A CN106050209 A CN 106050209A
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- heavy oil
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000000295 fuel oil Substances 0.000 title claims abstract description 24
- 239000003129 oil well Substances 0.000 claims abstract description 65
- 239000003921 oil Substances 0.000 claims abstract description 49
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000012216 screening Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims description 27
- 238000006073 displacement reaction Methods 0.000 claims description 23
- 230000000638 stimulation Effects 0.000 claims description 22
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 20
- -1 sulfuric acid ester Chemical class 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 230000035699 permeability Effects 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 11
- 239000004094 surface-active agent Substances 0.000 claims description 11
- 239000008398 formation water Substances 0.000 claims description 10
- 230000003213 activating effect Effects 0.000 claims description 7
- 239000003945 anionic surfactant Substances 0.000 claims description 6
- 241000237858 Gastropoda Species 0.000 claims description 5
- 150000001408 amides Chemical class 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- 150000003871 sulfonates Chemical class 0.000 claims description 4
- 239000002888 zwitterionic surfactant Substances 0.000 claims description 4
- 241001044369 Amphion Species 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- KWIUHFFTVRNATP-UHFFFAOYSA-N Betaine Natural products C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 2
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 229960003237 betaine Drugs 0.000 claims description 2
- 150000007942 carboxylates Chemical class 0.000 claims description 2
- 239000003093 cationic surfactant Substances 0.000 claims description 2
- 125000000623 heterocyclic group Chemical group 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- 150000001450 anions Chemical class 0.000 claims 1
- 150000001768 cations Chemical group 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 11
- 238000011084 recovery Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 10
- 238000010793 Steam injection (oil industry) Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000002736 nonionic surfactant Substances 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 3
- 235000020681 well water Nutrition 0.000 description 3
- 239000002349 well water Substances 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical group [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
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- 150000002148 esters Chemical class 0.000 description 1
- 238000013332 literature search Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 description 1
- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 description 1
- 229920000053 polysorbate 80 Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- JHJUUEHSAZXEEO-UHFFFAOYSA-M sodium;4-dodecylbenzenesulfonate Chemical compound [Na+].CCCCCCCCCCCCC1=CC=C(S([O-])(=O)=O)C=C1 JHJUUEHSAZXEEO-UHFFFAOYSA-M 0.000 description 1
- 239000002699 waste material 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
-
- 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 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
-
- 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
- E21B43/164—Injecting CO2 or carbonated water
Abstract
The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a method for improving the yield of a low-permeability heavy oil well. Specifically, the method comprises the following steps of screening of the oil well, fracture of the oil well, single-well throughput treatment of the oil well, and treatment of a shaft of the oil well. The method has the characteristics of being simple in process and high in operability, and is beneficial for field application and popularization. The method is high in pertinence, a series of technical measures can be selected in a targeted mode according to the characteristics of the low-permeability heavy oil well, accordingly, the yield of the oil well can be greatly improved, the period of validity of the oil well can be greatly prolonged, the oil increase amount of the single well is higher than 1000 tons, the period of validity is longer than 3 years, and the input-output ratio is 1:5. Thus, the method can be widely applied to field tests for yield improvement of the low-permeability heavy oil well.
Description
Technical field
The invention belongs to technical field of tertiary oil recovery, be specifically related to a kind of method improving hyposmosis heavy oil wells yield.
Background technology
Low-permeability oil deposit permeability is less than 10 × 10-3um2, enter high water-cut development after date in oil field, around how to improve
Water drive oil effect, raising well yield, steady oil control water or oil increasing precipitation, raising reservoir water drive recovery ratio, always oil field development
The problem that technical staff studies tackling key problem.Hyposmosis waterflooding reservoir existing waterflooding extraction mode, waterflood recovery efficiency factor is 25%
Hereinafter, still there is substantial amounts of oil in place cannot be converted into crude output, cause the huge waste of petroleum resources.
Viscous crude is high due to asphalt colloid content, and wax content is few, thus viscosity is high, flow difficulties, and exploitation difficulty is very big, mesh
Before, cyclic steam injection tech is the main method of the current thickened oil recovery of China, and it is to gulp down by steam that the whole nation there are about the heavy oil production of 80%
Tell acquisition.But, the problem that cyclic steam injection tech exists the following aspects: it is high that (1) generates steam cost, especially at water
Shortage of resources and the area of water price costliness, water processing cost is high；(2) due to steam injection, oil well heat loss, shake out, casing failure
More serious etc. situation, have influence on the enforcement of the utilization rate of oil wells and technological measure；(3) along with the increase of steam soak round, nearly well
The aqueous rising in area, consumes major part steam heat, and heat energy Quality degree of effective utilization is deteriorated, causes effectiveness to be deteriorated；
(4) heavy oil wells of part non-thermal recovery completion, it is impossible to carry out steam injection.
By literature search, the patent No. " ZL201010205368.3 ", entitled " a kind of low permeability oil field surfactant flooding
Oil preparation ", the present invention relates to the nonionic-anion surfactant oil displacement agent of a kind of low permeability oil field displacement of reservoir oil volume increase；By weight
Percentage ratio is the polyoxyethylene sorbitan monooleate dehydration of 0.1～3%, 4～the dodecylbenzene sodium sulfonate of 7%, 3～5%
2-acrylamide-2-methyl propane sulfonic, 2～4% organic solvent, remaining is water.The present invention has a disadvantage that and not enough: use
Single surface activity oil displacement agent can improve the displacement efficiency of low-permeability oil deposit, but can not be effectively improved oil reservoir involve body
Long-pending, therefore, have impact on the degree improving recovery ratio to a certain extent；Chemical oil displacement agent consumption is big, and chemical oil displacement agent price
Costliness, causes chemical flooding cost of investment higher, and therefore, input-output ratio is relatively low.
Summary of the invention
It is an object of the invention to provide a kind of method improving hyposmosis heavy oil wells yield for the deficiencies in the prior art,
First the method carries out pressure break to hyposmosis heavy oil wells, improves porosity and the permeance property of oil well；Secondly, CO is utilized2, chemistry
Surface activity oil displacement agent and N2The single well stimulation carrying out many rounds processes, and oil well yield is significantly increased；Finally, oil is carried out
The viscosity reduction of well shaft processes, and prevents crude oil owing to the reduction of temperature causes the viscosity drop of crude oil during well wellbore lifts
Low, mobility reduces, thus have impact on the normal production of oil well.The method has that technique is simple, specific aim and workable
Feature, the field test results of hyposmosis heavy oil wells can be effectively improved.
A kind of hyposmosis heavy oil wells improves the method for well yield, it is characterised in that specifically include following steps:
(1) oil well screening
The selection standard of oil well is: reservoir temperature less than 90 DEG C, permeability is less than 50 × 10-3μm2, ground viscosity of crude
5000mPa.s, core intersection are more than 1m.
(2) wellfracturing
Thickness h according to oil reservoir selects the crack quantity of pressure break, a length of 20 ~ 50m in crack, fracture width 2 ~ 5m, oil well pressure
The fracturing fluid split is Emulsified fracturing fluid or foam fracturing fluid.
(3) oil well single well stimulation processes
Utilize high pressure pump truck CO2, chemical surfactant and N2Injecting the oil jacket annular space of oil well after pressure break, injection mode is
Four slugs, the first slug are divided to inject liquid CO2；Second slug injects chemical surfactant；3rd slug injects liquid N2；
4th slug injects formation water displacement fluid, the first slug liquid CO2Injection rate be respectively 6-8m3, the 3rd slug liquid N2Note
Entering amount is 8-10m3, the mass concentration of chemical surfactant is 0.3-0.5%, volume injection rate=(0.2-0.3) × fracture number
Amount × fracture length × fracture width × core intersection, the injection rate of formation water displacement fluid is 6-10m3, displacement fluid is stewing after having noted
Opening well and making production after well 20-30d, the cycle of single well stimulation is 12-18 month, and the number of times of single well stimulation is 2-3 time.
(4) process of well wellbore
During oil well single well stimulation opening well and making production, carry out the process of well wellbore, utilize dosing pump by water solublity thinner from oil
Injecting the pit shaft of oil well in the oil jacket annular space of well, the cycle that adds of water solublity thinner is 20-30d, the dosage of every round is
80-100kg。
The crack quantity 3 of pressure break when the crack quantity of pressure break 1 ~ 2,5m ＜ h ＜ 2m when described crack quantity is h≤2m
~ 5, h >=5m time pressure break crack quantity 6 ~ 8.
Described chemical surfactant is anion surfactant, cationic surfactant, amphion surface
One in activating agent and nonionic surfactant.
Described anion surfactant is the one in metal carboxylate, Sulfonates and sulfuric acid ester, described sun
Ionic surface active agent is the one in amine salt, quaternary ammonium salt and heterocyclic, and described zwitterionic surfactant is phosphorus
One in acid esters type and betaine type, described nonionic surfactant is alkyl polyglycoside type, polyoxyethylene-type and alkanol
One in acid amide type.
Described water solublity thinner is Fatty Alcohol Ether Carboxylate, and mass concentration is respectively 1.0-1.5%.
The present invention is directed to the feature of hyposmosis heavy oil wells, first hyposmosis heavy oil wells is carried out pressure break, improve the hole of oil well
Gap and permeance property；Secondly, injection CO is utilized2, chemical surface activity oil displacement agent and N2Carry out at the single well stimulation of many rounds
Reason, is significantly increased hyposmosis viscous crude well yield；Finally, the viscosity reduction carrying out well wellbore processes, and prevents crude oil at oil well
The reduction of viscosity of crude, mobility is caused to reduce, thus have impact on oil well due to the reduction of temperature during wellbore lift
Normal production.The method has that technique is simple, specific aim and workable feature, can be effectively improved hyposmosis heavy oil wells
Yield, individual well oil increment be more than 1000t, effect duration be more than 3 years.
The medicine have the advantages that
(1) present invention has the feature that technique is simple and workable, beneficially field popularization application；
(2) present invention and the method for heat extraction by steam injection have low cost, risk is low and maintenance cost is low, and do not result in tubing string
Corrosion.
(3) present invention's is with strong points, and the present invention selects series targetedly according to the feature of hyposmosis heavy oil wells
Technological measure, accordingly, it is capable to oil well yield and effect duration are significantly increased, individual well oil increment is more than 1000t, and effect duration is more than
3 years, input-output ratio was 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
The present invention solely for the purpose of illustration, rather than limit the scope of the present invention by any way.
Embodiment 1
Certain oilfield D7, reservoir temperature 83 DEG C, permeability 42 × 10-3μm2, viscosity of crude 3934mPa.s, core intersection
4.5m, this well day oil-producing 6.3t before test, aqueous 93.3%, utilize the method for the present invention at oil well D7Implement scene test, specifically
Implement step as follows:
(1) screening of oil well
The selection standard of oil well is: reservoir temperature less than 90 DEG C, permeability is less than 50 × 10-3μm2, ground viscosity of crude
5000mPa.s, core intersection are more than 1m；Oil well D7Reservoir temperature 83 DEG C, permeability 42 × 10-3μm2, ground viscosity of crude
3934mPa.s, core intersection 4.5m, meet the screening criteria of oil well, can implement the present invention at this well.
(2) pressure break of oil well
The fracturing fluid of wellfracturing is Emulsified fracturing fluid, and crack quantity is 5, a length of 20m in crack, fracture width 3m.
(3) single well stimulation of oil well processes
Utilize high pressure pump truck CO2, Sulfonates anion surfactant and N2After pressure break, the oil jacket annular space of oil well injects,
Injection mode is point four slugs, and the first slug injects liquid CO2；Second slug injects Sulfonates anion surface active
Agent；3rd slug injects liquid N2；4th slug injects formation water displacement fluid, wherein, the first slug liquid CO2With the 3rd slug
Liquid N2Injection rate be respectively 8m3And 10m3, the mass concentration of Sulfonates anion surfactant is 0.5%, volume note
Enter amount=0.2 × 5 × 20 × 3 × 4.5=270m3, the injection rate of formation water displacement fluid is 10m3, after displacement fluid boils in a covered pot over a slow fire well 30d after having noted
Opening well and making production, the cycle of single well stimulation is 18 months, and the number of times of single well stimulation is 2 times.
(4) process of well wellbore
During oil well single well stimulation opening well and making production, carry out the process of well wellbore, utilize dosing pump Fatty Alcohol Ether Carboxylate to be dropped
Stick injects the pit shaft of oil well from the oil jacket annular space of oil well, and the cycle that adds of Fatty Alcohol Ether Carboxylate thinner is 25d, often takes turns
Secondary dosage is 90kg, and described Fatty Alcohol Ether Carboxylate thinner mass concentration is respectively 1.3%.
At oil well D7After implementing the present invention, well water have dropped 7.2 percentage points, and effect duration is 5 years, and averagely increase day by day oil
2.1t, accumulative increasing oil 3833t, input-output ratio is 1:8.2, and field test results is good.
Embodiment 2
Certain oilfield H2, reservoir temperature 74 DEG C, permeability 23 × 10-3μm2, viscosity of crude 4587mPa.s, core intersection
2.8m, this well day oil-producing 3.7t before test, aqueous 93.4%, utilize the method for the present invention at oil well H2Implement scene test, specifically
Implement step as follows:
(1) screening of oil well
The selection standard of oil well is: reservoir temperature less than 90 DEG C, permeability is less than 50 × 10-3μm2, ground viscosity of crude
5000mPa.s, core intersection are more than 1m；Oil well H2Reservoir temperature 74 DEG C, permeability 23 × 10-3μm2, ground viscosity of crude
4587mPa.s, core intersection 2.8m, meet the screening criteria of oil well, can implement the present invention at this well.
(2) pressure break of oil well
The fracturing fluid of wellfracturing is foam fracturing fluid, and crack quantity is 3, a length of 40m in crack, fracture width 2m.
(3) single well stimulation of oil well processes
Utilize high pressure pump truck CO2, phosphate type zwitterionic surfactant and N2After pressure break, the oil jacket annular space of oil well is noted
Entering, injection mode is point four slugs, and the first slug injects liquid CO2；Second slug injects phosphate type amphion surface
Activating agent；3rd slug injects liquid N2；4th slug injects formation water displacement fluid, wherein, the first slug liquid CO2With the 3rd
Slug liquid N2Injection rate be respectively 6m3And 9m3, the mass concentration of phosphate type zwitterionic surfactant is 0.3%, body
Long-pending injection rate=0.3 × 3 × 40 × 2 × 2.8=202m3, the injection rate of formation water displacement fluid is 8m3, displacement fluid is stewing well after having noted
Opening well and making production after 25d, the cycle of single well stimulation is 15 months, and the number of times of single well stimulation is 2 times.
(4) process of well wellbore
During oil well single well stimulation opening well and making production, carry out the process of well wellbore, utilize dosing pump Fatty Alcohol Ether Carboxylate to be dropped
Stick injects the pit shaft of oil well from the oil jacket annular space of oil well, and the cycle that adds of Fatty Alcohol Ether Carboxylate thinner is 30d, often takes turns
Secondary dosage is 100kg, and described Fatty Alcohol Ether Carboxylate thinner mass concentration is respectively 1.5%.
At oil well H2After implementing the present invention, well water have dropped 4.7 percentage points, and effect duration is 4.0 years, averagely increases day by day
Oil 2.2t, accumulative increasing oil 3212t, input-output ratio is 1:8.3, and field test results is good.
Embodiment 3
Certain oilfield K11, reservoir temperature 57 DEG C, permeability 25 × 10-3μm2, viscosity of crude 4207mPa.s, core intersection
1.3m, this well day oil-producing 2.6t before test, aqueous 95.2%, utilize the method for the present invention at oil well K11Implement scene test, specifically
Implement step as follows:
(1) screening of oil well
The selection standard of oil well is: reservoir temperature less than 90 DEG C, permeability is less than 50 × 10-3μm2, ground viscosity of crude
5000mPa.s, core intersection are more than 1m；Oil well K11Reservoir temperature 57 DEG C, permeability 25 × 10-3μm2, ground viscosity of crude
4207mPa.s, core intersection 1.8m, meet the screening criteria of oil well, can implement the present invention at this well.
(2) pressure break of oil well
The fracturing fluid of wellfracturing is Emulsified fracturing fluid, and crack quantity is 2, a length of 50m in crack, fracture width 5m.
(3) single well stimulation of oil well processes
Utilize high pressure pump truck CO2, alkylol amide type nonionic surfactant and N2After pressure break, the oil jacket annular space of oil well is noted
Entering, injection mode is point four slugs, and the first slug injects liquid CO2；Second slug injects alkylol amide type non-ionic surface
Activating agent；3rd slug injects liquid N2；4th slug injects formation water displacement fluid, wherein, the first slug liquid CO2With the 3rd
Slug liquid N2Injection rate be respectively 7m3And 8m3, the mass concentration of alkylol amide type nonionic surfactant is 0.4%, body
Long-pending injection rate=0.25 × 2 × 50 × 5 × 1.3=163m3, the injection rate of formation water displacement fluid is 6m3, displacement fluid is stewing well after having noted
Opening well and making production after 20d, the cycle of single well stimulation is 12 months, and the number of times of single well stimulation is 3 times.
(4) process of well wellbore
During oil well single well stimulation opening well and making production, carry out the process of well wellbore, utilize dosing pump Fatty Alcohol Ether Carboxylate to be dropped
Stick injects the pit shaft of oil well from the oil jacket annular space of oil well, and the cycle that adds of Fatty Alcohol Ether Carboxylate thinner is 20d, often takes turns
Secondary dosage is 80kg, and described Fatty Alcohol Ether Carboxylate thinner mass concentration is respectively 1.0%.
At oil well K11After implementing the present invention, well water have dropped 5.3 percentage points, and effect duration is 4 years, and averagely increase day by day oil
1.7t, accumulative increasing oil 2482t, input-output ratio is 1:7.3, and field test results is good.
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, Er Qie
In the case of the spirit or essential attributes of the present invention, it is possible to realize the present invention in other specific forms.Therefore, no matter
From the point of view of which point, all should regard embodiment as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all by fall in the implication of equivalency and scope of claim
Change is included in the present invention.
Although moreover, it will be appreciated that this specification is been described by according to embodiment, but the most each embodiment only wraps
Containing an independent technical scheme, this narrating mode of description is only that for clarity sake those skilled in the art should
Description can also be formed those skilled in the art through appropriately combined as an entirety, the technical scheme in each embodiment
May be appreciated other embodiments.
Claims (8)
1. the method improving hyposmosis heavy oil wells yield, it is characterised in that specifically include following steps:
(1) oil well screening
The selection standard of oil well is: reservoir temperature less than 90 DEG C, permeability is less than 50 × 10-3μm2, ground viscosity of crude
5000mPa.s, core intersection are more than 1m；
(2) wellfracturing
Thickness h according to oil reservoir selects the crack quantity of pressure break, a length of 20 ~ 50m in crack, fracture width 2 ~ 5m, oil well pressure
The fracturing fluid split is Emulsified fracturing fluid or foam fracturing fluid；
(3) oil well single well stimulation processes
Utilize high pressure pump truck CO2, chemical surfactant and N2Injecting the oil jacket annular space of oil well after pressure break, injection mode is
Four slugs, the first slug are divided to inject liquid CO2；Second slug injects chemical surfactant；3rd slug injects liquid N2；
4th slug injects formation water displacement fluid, the first slug liquid CO2Injection rate be respectively 6-8m3, the 3rd slug liquid N2Note
Entering amount is 8-10m3, the mass concentration of chemical surfactant is 0.3-0.5%, volume injection rate=(0.2-0.3) × fracture number
Amount × fracture length × fracture width × core intersection, the injection rate of formation water displacement fluid is 6-10m3, displacement fluid is stewing after having noted
Opening well and making production after well 20-30d, the cycle of single well stimulation is 12-18 month, and the number of times of single well stimulation is 2-3 time；
(4) process of well wellbore
During oil well single well stimulation opening well and making production, carry out the process of well wellbore, utilize dosing pump by water solublity thinner from oil
Injecting the pit shaft of oil well in the oil jacket annular space of well, the cycle that adds of water solublity thinner is 20-30d, the dosage of every round is
80-100kg。
The method of raising hyposmosis heavy oil wells yield the most according to claim 1, it is characterised in that described crack quantity
For the crack of pressure break when the crack quantity 3 ~ 5 of pressure break, h >=5m when the crack quantity of pressure break 1 ~ 2,5m ＜ h ＜ 2m during h≤2m
Quantity 6 ~ 8.
The method of raising hyposmosis heavy oil wells yield the most according to claim 1 and 2, it is characterised in that described chemical table
Face activating agent is that anion surfactant, cationic surfactant, zwitterionic surfactant and non-ionic surface are lived
One in property agent.
The method of raising hyposmosis heavy oil wells yield the most according to claim 3, it is characterised in that described anion table
Face activating agent is the one in metal carboxylate, Sulfonates and sulfuric acid ester.
The method of raising hyposmosis heavy oil wells yield the most according to claim 4, it is characterised in that described cation form
Face activating agent is the one in amine salt, quaternary ammonium salt and heterocyclic.
The method of raising hyposmosis heavy oil wells yield the most according to claim 5, it is characterised in that described amphion
Surfactant is the one in phosphate type and betaine type.
The method of raising hyposmosis heavy oil wells yield the most according to claim 6, it is characterised in that described nonionic table
Face activating agent is the one in alkyl polyglycoside type, polyoxyethylene-type and alkylol amide type.
The method of raising hyposmosis heavy oil wells yield the most according to claim 1, it is characterised in that described water solublity fall
Stick is Fatty Alcohol Ether Carboxylate, and mass concentration is respectively 1.0-1.5%.
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