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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
carbon dioxide
injecting
injection
sleeve
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911238300.2A
Other languages
Chinese (zh)
Inventor
赵金树
康智超
赵萌
胡亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daqing Jinjun Petroleum Technology Development Co ltd
Original Assignee
Daqing Jinjun Petroleum Technology Development Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daqing Jinjun Petroleum Technology Development Co ltd filed Critical Daqing Jinjun Petroleum Technology Development Co ltd
Priority to CN201911238300.2A priority Critical patent/CN111022006A/en
Publication of CN111022006A publication Critical patent/CN111022006A/en
Pending legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/164Injecting CO2 or carbonated water
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/52Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/58Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
    • C09K8/594Compositions 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

Method for improving shale oil well recovery ratio through carbon dioxide composite huff and puff
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%.
CN201911238300.2A 2019-12-06 2019-12-06 Method for improving shale oil well recovery ratio through carbon dioxide composite huff and puff Pending CN111022006A (en)

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

Applications Claiming Priority (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

Publications (1)

Publication Number Publication Date
CN111022006A true CN111022006A (en) 2020-04-17

Family

ID=70208110

Family Applications (1)

Application Number Title Priority Date Filing Date
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

Country Status (1)

Country Link
CN (1) CN111022006A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
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

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070199697A1 (en) * 2006-02-27 2007-08-30 Grant Hocking Enhanced hydrocarbon recovery by steam injection of oil sand formations
CN101240701A (en) * 2007-02-07 2008-08-13 钜力集团有限公司 Non-strong water-sensitive special oil reservoir heating power oil extraction method
CN101438027A (en) * 2006-05-10 2009-05-20 雷斯昂公司 Method and apparatus for capture and sequester of carbon dioxide and extraction of energy from large land masses during and after extraction of hydrocarbon fuels or contaminants using energy and criti
CN101839123A (en) * 2010-03-26 2010-09-22 北京东方亚洲石油技术服务有限公司 Exploitation method for wax precipitation oil reservoir
CN102391847A (en) * 2011-10-07 2012-03-28 李立文 Composite microbe oil displacement agent and use thereof
CN102678096A (en) * 2012-05-08 2012-09-19 中国石油天然气股份有限公司 Method for exploiting high-pour-point oil reservoir through hot water assisted gravity drainage
CN104481475A (en) * 2014-10-10 2015-04-01 赵金树 Oil well carbon dioxide carbonated water throughput production increasing method
CN104632161A (en) * 2013-11-13 2015-05-20 中国石油化工股份有限公司 Multiple thermal fluid composite system oil displacing method
CN106350048A (en) * 2016-07-22 2017-01-25 北京斯迪莱铂油气技术有限公司 Oil washing agent for oil well fracturing as well as preparation method and application of oil washing agent
CN106968652A (en) * 2017-03-27 2017-07-21 姚莉芳 A kind of auxiliary carbon dioxide is handled up new method
CN107288594A (en) * 2017-09-04 2017-10-24 中国石油化工股份有限公司华东油气分公司泰州采油厂 A kind of pressure injection system and method for improving CO_2 stimulation effect
CN109138944A (en) * 2018-09-11 2019-01-04 大庆金军石油科技开发有限公司 A kind of carbon dioxide compound throughput new method
US20190055825A1 (en) * 2017-08-18 2019-02-21 Linde Aktiengesellschaft Unconventional reservoir enhanced or improved oil recovery
CN111088024A (en) * 2018-10-23 2020-05-01 中国石油化工股份有限公司 High-temperature high-salt oil reservoir oil-washing agent, preparation method thereof and carbon dioxide oil displacement method

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070199697A1 (en) * 2006-02-27 2007-08-30 Grant Hocking Enhanced hydrocarbon recovery by steam injection of oil sand formations
CN101438027A (en) * 2006-05-10 2009-05-20 雷斯昂公司 Method and apparatus for capture and sequester of carbon dioxide and extraction of energy from large land masses during and after extraction of hydrocarbon fuels or contaminants using energy and criti
CN101240701A (en) * 2007-02-07 2008-08-13 钜力集团有限公司 Non-strong water-sensitive special oil reservoir heating power oil extraction method
CN101839123A (en) * 2010-03-26 2010-09-22 北京东方亚洲石油技术服务有限公司 Exploitation method for wax precipitation oil reservoir
CN102391847A (en) * 2011-10-07 2012-03-28 李立文 Composite microbe oil displacement agent and use thereof
CN102678096A (en) * 2012-05-08 2012-09-19 中国石油天然气股份有限公司 Method for exploiting high-pour-point oil reservoir through hot water assisted gravity drainage
CN104632161A (en) * 2013-11-13 2015-05-20 中国石油化工股份有限公司 Multiple thermal fluid composite system oil displacing method
CN104481475A (en) * 2014-10-10 2015-04-01 赵金树 Oil well carbon dioxide carbonated water throughput production increasing method
CN106350048A (en) * 2016-07-22 2017-01-25 北京斯迪莱铂油气技术有限公司 Oil washing agent for oil well fracturing as well as preparation method and application of oil washing agent
CN106968652A (en) * 2017-03-27 2017-07-21 姚莉芳 A kind of auxiliary carbon dioxide is handled up new method
US20190055825A1 (en) * 2017-08-18 2019-02-21 Linde Aktiengesellschaft Unconventional reservoir enhanced or improved oil recovery
CN107288594A (en) * 2017-09-04 2017-10-24 中国石油化工股份有限公司华东油气分公司泰州采油厂 A kind of pressure injection system and method for improving CO_2 stimulation effect
CN109138944A (en) * 2018-09-11 2019-01-04 大庆金军石油科技开发有限公司 A kind of carbon dioxide compound throughput new method
CN111088024A (en) * 2018-10-23 2020-05-01 中国石油化工股份有限公司 High-temperature high-salt oil reservoir oil-washing agent, preparation method thereof and carbon dioxide oil displacement method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
《油田开发与开采分册》编写组编: "《英汉石油大辞典 油田开发与开采分册》", 30 June 1995 *
杨服民,耿玉广等: "《华北油田采油工程技术》", 31 March 1998 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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
CN112814669B (en) * 2021-04-02 2023-06-27 中国石油天然气股份有限公司 Shale oil reservoir full life cycle recovery ratio prediction method and system

Similar Documents

Publication Publication Date Title
US10196884B2 (en) Method for enhancing oil recovery in huff-puff oil production of tight oil from a fractured horizontal well
CN107255027B (en) Compound modification method for carbonate rock reservoir
CN101333922A (en) Fracturing process for removing breakdown fluid contamination
CN109209306B (en) Horizontal well CO injection for ultra-low permeability tight oil reservoir2Asynchronous throughput energy supplementing method
CN106837274B (en) Method for injecting oil displacement agent into oil layer by fracturing to improve recovery ratio
CN106593389B (en) Fracturing method for realizing high-angle natural fracture oil reservoir by adopting permanent plugging agent
CN101787864A (en) Water plugging method for fractured water-flooded oil well for water injection development of oil reservoir in low-permeability reservoir
CN103590801A (en) Coal bed methane horizontal well nitrogen foam fracturing mining technology
CN104847317A (en) Method for raising recovery efficiency of super-deep low permeability heavy oil reservoir
CN101158280A (en) Oil well high water-bearing layer pressure blocking method
CN111456693B (en) Method for supplementing formation energy by advanced gas injection and continuous gas injection of tight-shale oil reservoir
CA3000260A1 (en) Methods for performing fracturing and enhanced oil recovery in tight oil reservoirs
CN111022006A (en) Method for improving shale oil well recovery ratio through carbon dioxide composite huff and puff
Chang et al. The use of oil-soluble polymers to enhance oil recovery in hard to recover hydrocarbons reserves
CN112796729B (en) Quasi-dry method liquid supercritical CO 2 Acid fracturing method
CN100485160C (en) Nitrogen foam adjusting-actuating segment plug injection technique
CN105332672A (en) Multi-element composite water-control oil-enhancement method for extracting oil
CN106121613B (en) Temporary stall is to fracturing technology method in a kind of coal bed gas well pit shaft
CN108457633B (en) Intralayer selective fracturing method
CN113969770B (en) High-pressure energy storage-body-to-body release type volumetric water drive development method for side water reservoir water body
CN105089573A (en) Mining method for improving oil displacement efficiency of matrix and micro-fracture by dual-medium reservoir gas injection
CN113356820A (en) Fracturing method
CN113323636A (en) Nitrogen injection amount determining method and oil extraction method for composite water control and oil increase
CN112878954A (en) Design method of adjustment construction slug of underground river oil reservoir flow channel
CN114427428A (en) Method for improving recovery ratio by controlling water under stable pressure in bottom water heavy oil reservoir

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20200417

RJ01 Rejection of invention patent application after publication