CN111022006A - Method for improving shale oil well recovery ratio through carbon dioxide composite huff and puff - Google Patents
Method for improving shale oil well recovery ratio through carbon dioxide composite huff and puff Download PDFInfo
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- CN111022006A CN111022006A CN201911238300.2A CN201911238300A CN111022006A CN 111022006 A CN111022006 A CN 111022006A CN 201911238300 A CN201911238300 A CN 201911238300A CN 111022006 A CN111022006 A CN 111022006A
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- carbon dioxide
- injecting
- injection
- sleeve
- pressure
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 26
- 239000003079 shale oil Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000011084 recovery Methods 0.000 title claims abstract description 12
- 239000002131 composite material Substances 0.000 title claims abstract description 7
- 238000002347 injection Methods 0.000 claims abstract description 35
- 239000007924 injection Substances 0.000 claims abstract description 35
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005406 washing Methods 0.000 claims abstract description 16
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 8
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 8
- 230000002579 anti-swelling effect Effects 0.000 claims abstract description 8
- 238000005086 pumping Methods 0.000 claims abstract description 7
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 4
- 238000005485 electric heating Methods 0.000 claims abstract description 4
- 239000001103 potassium chloride Substances 0.000 claims abstract description 4
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 4
- 239000003208 petroleum Substances 0.000 claims description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 4
- 230000000638 stimulation Effects 0.000 claims 1
- 239000003921 oil Substances 0.000 description 19
- 239000010779 crude oil Substances 0.000 description 11
- 230000035699 permeability Effects 0.000 description 9
- 239000012535 impurity Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002925 chemical effect Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- -1 polyoxyethylene octyl phenol Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention relates to a method for improving the recovery ratio of a shale oil well by carbon dioxide composite huff and puff, which comprises the following steps: firstly, 200kg of oil washing agent is added from the sleeve, and then 20-30 m of oil washing agent is added from the sleeve3The well is closed after the pumping unit normally operates for 48 hours under the condition of hot water with the temperature of more than 70 ℃; (II) injecting 10-20% of anti-swelling agent liquid ammonium chloride or potassium chloride from the sleeve in a natural pressure injection mode; injecting liquid carbon dioxide from the sleeve, injecting the liquid carbon dioxide into the sleeve through an electric heating pipe, keeping the injection temperature of the liquid carbon dioxide above 10 ℃, keeping the injection pressure not more than 15MPa, and slowly injecting at low pressure, wherein the injection amount is 1.5 times of the effective thickness of the stratum; (IV) stewing: and stewing for 30 days.
Description
Technical Field
The method relates to a method for improving the crude oil recovery rate of a shale oil well, in particular to a method for improving the crude oil recovery rate of the shale oil well by carbon dioxide combined huff and puff.
Background
Shale oil wells mainly exploit shale oil layers, generally adopt horizontal well drilling and large-scale volume fracturing to increase single well yield, and mainly exploit the self energy failure of strata. Because the shale oil reservoir has low permeability and strong water sensitivity, the single-well yield is reduced quickly, and the conventional water drive can not be utilized to supplement energy, the shale oil well recovery rate is generally low. As shale wells continue to produce, some heavy crude oil components are deposited around the near well, which is an unavoidable reality of all wells during production, and shale oil is more prone to this phenomenon, mainly because as the formation pressure continues to decrease, the crude oil is gradually degassed, the viscosity of the oil increases, and the process is not reversed, so that the pore permeability around part of the near well deteriorates year after year, which is also an important cause of the reduction of the well production.
The invention content is as follows:
in order to solve the technical problems in the background technology, the invention provides a method for improving the recovery ratio of a shale oil well by carbon dioxide composite huff and puff, and by adopting the technical scheme of the invention, 80% of impurity components around a near well can be quickly brought to the ground, so that secondary pollution is prevented, the permeability around the near well can be improved, the viscosity of crude oil can be reduced by more than 50%, and the permeability is improved by more than 30%.
The technical scheme of the invention is as follows: a method for improving the recovery ratio of a shale oil well by carbon dioxide composite huff and puff comprises the following steps:
firstly, when the pumping unit normally operates, 200kg of oil washing agent is added from a sleeve, and then 20-30 m of oil washing agent is added from the sleeve3The well is closed after the pumping unit normally operates for 48 hours under the condition of hot water with the temperature of more than 70 ℃; wherein the oil washing agent consists of OP-10 with the mass concentration of 5%, petroleum sulfonate with the mass concentration of 25% and water with the mass concentration of 70%;
(II) injecting 10-20% of anti-swelling agent liquid ammonium chloride or potassium chloride from the casing pipe, wherein the injection amount is 3-5t per meter of oil layer, the injection mode is mainly natural pressure injection, and if the natural injection pressure injection amount can reach the design amount, the natural injection pressure is used; if the designed amount is not reached, injecting by using a plunger pump to reach the minimum injection amount;
injecting liquid carbon dioxide from the sleeve, injecting the liquid carbon dioxide into the sleeve through an electric heating pipe, keeping the injection temperature of the liquid carbon dioxide above 10 ℃, keeping the injection pressure not more than 15MPa, slowly injecting at low pressure, wherein the injection amount is 50-75 t, and is preferably 1.5 times of the effective thickness of the stratum;
(IV) stewing: the time is 30 days, after the well is stewed for 30 days, the casing pressure is still larger than 4MPa, and the well is stewed continuously until the casing pressure is smaller than 4 MPa.
The oil washing agent consists of OP-10 with the mass concentration of 5%, petroleum sulfonate with the mass concentration of 25% and water with the mass concentration of 70%.
The invention has the following beneficial effects: after the oil well is mined for a long time, a large amount of heavy components can be precipitated in a shaft and a stratum around the shaft due to degassing reasons and adsorption, once the heavy components enter a micropore throat, the stratum permeability can be obviously reduced, 80 percent of impurity components can be quickly brought to the ground through well washing by a surfactant, and secondary pollution is prevented. Generally, the viscosity of crude oil can be reduced by more than 50%, and the permeability can be improved by more than 30%.
The specific implementation mode is as follows:
the invention is further illustrated by the following examples:
a method for improving the recovery ratio of a shale oil well by carbon dioxide composite huff and puff comprises the following steps:
firstly, when the pumping unit normally operates, 200kg of oil washing agent is added from a sleeve, and then 20-30 m of oil washing agent is added from the sleeve3Hot water with the temperature of more than 70 ℃ circulates in a shaft, a shale oil well is mainly produced in a depletion mode by utilizing self energy of a stratum, and hot water is injected from a sleeve under normal pressure for supplementing energy to supplement energy, so that the recovery rate is improved. Closing the well after the pumping unit normally operates for 48 hours; wherein the oil washing agent consists of polyoxyethylene octyl phenol ether-10 (OP-10) with the mass concentration of 5 percent, petroleum sulfonate with the mass concentration of 25 percent and water with the mass concentration of 70 percent; shale belongs to the viscous oil, and the shale oil after degasification is easier to deposit some crude oil heavy components around the near well in the process of exploitation, is easy to form blockage, so that the hole seepage around the near well can be worsened year by year, and 80% of impurity components are quickly brought to the ground through the oil washing agent and the hot water, so that the secondary pollution is prevented.
The shale oil well mainly comprises mudstone which is high in water sensitivity and water-swellable, and in order to solve the problem, the anti-swelling agent is injected before huffing and puff to effectively inhibit the mudstone swelling without influencing the physical property of a reservoir stratum. Injecting 10-20% of anti-swelling agent liquid ammonium chloride or potassium chloride from the casing with the injection amount of 3-5t per meter of oil layer, wherein the injection mode is mainly natural pressure injection, and if the natural injection pressure injection amount can reach the effective thickness treatment radius of the stratum of 0.5 meter, the natural injection pressure is used; if the effective thickness of the stratum cannot reach the treatment radius of 0.5 m, injecting by using a plunger pump to reach the minimum injection amount; a certain amount of hot water needs to be injected by flushing a well with a surfactant, and a part of water is also produced in a stratum, so that a certain amount of expansion-preventing agent needs to be added to prevent the stratum from expanding after meeting water and reduce the effective permeability of the stratum in consideration of poor physical properties of the reservoir stratum and high clay components, and the liquid water is easy to cause clay expansion, and the expansion-preventing rate of the expansion-preventing agent can reach more than 85%.
Injecting liquid carbon dioxide from the sleeve, injecting the liquid carbon dioxide into the sleeve through an electric heating pipe, keeping the injection temperature of the liquid carbon dioxide above 10 ℃, keeping the injection pressure not more than 15MPa, slowly injecting at low pressure, wherein the injection amount is 50-75 t, and is preferably 1.5 times of the effective thickness of the stratum; the temperature of carbon dioxide injected conventionally is lower than-20 ℃, so that the viscosity of crude oil around a near well is easily increased, and heavy components are separated out. The liquid formed by the injected carbon dioxide and water and having pH value equal to 4 also has the function of anti-swelling, the acidic liquid also has the function of anti-swelling, the dual function plays a role of displacement, the water absorption capacity of the shale oil is stronger than the oil absorption capacity, which is equivalent to forming a displacement reaction, and the oil is extracted.
(IV) stewing: and (5) stewing for 30 days, wherein the casing pressure is still higher than 4MPa after the casing is stewed for 30 days, and stewing is continued until the casing pressure is lower than 4 MPa. The purpose of soaking is to promote injected medicament, carbon dioxide and formation crude oil to be fully mixed, and after multiple contact and phase mixing, physical and chemical effects are generated, so that the purposes of reducing the viscosity of the crude oil and improving the permeability around a near well are achieved, generally, the viscosity of the crude oil can be reduced by more than 50%, and the permeability can be improved by more than 30%. Soaking is a very important process parameter.
The application is applied to a Ye-1 well, and 200kg of oil washing agent and 28m of oil washing agent are injected3Hot water, 15% mass concentration anti-swelling agent liquid 4t and liquid carbon dioxide 65m3The average injection pressure of the liquid carbon dioxide is kept at about 12.5MPa, the well is opened for production after 30 days of soaking, the average daily oil increase is 2.8 tons, the cumulative oil increase is 512 tons, and the measure oil increase effect is obvious.
Claims (2)
1. A method for improving the recovery ratio of a shale oil well by carbon dioxide composite huff and puff comprises the following steps:
firstly, when the pumping unit normally operates, 200kg of oil washing agent is added from a sleeve, and then 20-30 m of oil washing agent is added from the sleeve3The well is closed after the pumping unit normally operates for 48 hours under the condition of hot water with the temperature of more than 70 ℃;
secondly, injecting 10-20% of anti-swelling agent liquid ammonium chloride or potassium chloride from the casing, wherein the injection amount is 3-5t per meter of oil layer, the injection mode is mainly natural pressure injection, and if the natural injection pressure injection amount can reach the effective thickness treatment radius of the stratum of 0.5 meter, the natural injection pressure is used; if the effective thickness of the stratum cannot reach the treatment radius of 0.5 m, injecting by using a plunger pump to reach the minimum injection amount;
injecting liquid carbon dioxide from the sleeve, injecting the liquid carbon dioxide into the sleeve through an electric heating pipe, keeping the injection temperature of the liquid carbon dioxide above 10 ℃, keeping the injection pressure not more than 15MPa, slowly injecting at low pressure, and preferably injecting 50-75 t of the injection amount which is 1.5 times of the effective thickness of the stratum;
(IV) stewing: and (5) stewing for 30 days, wherein the casing pressure is still higher than 4MPa after the casing is stewed for 30 days, and stewing is continued until the casing pressure is lower than 4 MPa.
2. The method of carbon dioxide stimulation enhanced shale oil well recovery as claimed in claim 1, wherein: wherein the oil washing agent consists of OP-10 with the mass concentration of 5%, petroleum sulfonate with the mass concentration of 25% and water with the mass concentration of 70%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911238300.2A CN111022006A (en) | 2019-12-06 | 2019-12-06 | Method for improving shale oil well recovery ratio through carbon dioxide composite huff and puff |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911238300.2A CN111022006A (en) | 2019-12-06 | 2019-12-06 | Method for improving shale oil well recovery ratio through carbon dioxide composite huff and puff |
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| CN111022006A true CN111022006A (en) | 2020-04-17 |
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| CN201911238300.2A Pending CN111022006A (en) | 2019-12-06 | 2019-12-06 | Method for improving shale oil well recovery ratio through carbon dioxide composite huff and puff |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112814669A (en) * | 2021-04-02 | 2021-05-18 | 中国石油天然气股份有限公司 | Shale oil reservoir full life cycle recovery rate prediction method and system |
| CN115075783A (en) * | 2021-03-10 | 2022-09-20 | 中国石油天然气股份有限公司 | Displacement experiment device and method |
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| CN115075783A (en) * | 2021-03-10 | 2022-09-20 | 中国石油天然气股份有限公司 | Displacement experiment device and method |
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