CN104895540A - A method of using an anti-swelling agent to help a steam flooding in improving the recovery ratio of water-sensitive heavy oil reservoirs - Google Patents
A method of using an anti-swelling agent to help a steam flooding in improving the recovery ratio of water-sensitive heavy oil reservoirs Download PDFInfo
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- CN104895540A CN104895540A CN201410075571.1A CN201410075571A CN104895540A CN 104895540 A CN104895540 A CN 104895540A CN 201410075571 A CN201410075571 A CN 201410075571A CN 104895540 A CN104895540 A CN 104895540A
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- steam
- expansion
- resisting agent
- heavy oil
- oil reservoir
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Abstract
The invention provides a method of using an anti-swelling agent to help a steam flooding in improving the recovery ratio of water-sensitive heavy oil reservoirs. The method comprises the steps of injecting mixed steam and anti-swelling agent solution in a steam injection well of a water-sensitive heavy oil reservoir at the same time and injecting steam in the steam injection well continuously and separately, wherein the anti-swelling agent solution is prepared by diluting a high-concentration mother solution by using preparing water until the concentration is 1% and the mixing ratio of the anti-swelling agent solution to the steam is 1:5. It is needed that the mixed steam and anti-swelling agent solution is injected in the steam injection well continuously for not less than 110 days. The anti-swelling agent is a cationic anti-swelling agent; the injection speed of anti-swelling agent is 1t/h; the injection speed of steam is 5t/h; the degree of dryness of a well bottom must be greater than 40% and the degree of dryness of a well mouth is correspondingly greater than 85%. The effect of heat in the vicinity and prevention in the distance is achieved by using the high temperature steam and the anti-swelling agent, so that the recovery ratio of highly water-sensitive heavy oil reservoirs is improved.
Description
Technical field
The present invention relates to oil extraction in oil field technology, especially a kind of expansion-resisting agent assisted steam flooding improves the method for water sensitivity recovery factor of heavy oil reservoir.
Background technology
2002, Chinese Shengli Oil Field exploration found nearly hundred million tons strong strong retraction heavy crude reservoirs, and at home and abroad still belong to the first time the strong strong retraction heavy crude reservoir on a large scale found.Sensitivity heavy oil reservoir, as a kind of new Oil Reservoir Types, there is no general definition in the world, and after we claim reservoir to meet external injection water, the heavy crude reservoir of permeability reduction is water sensitivity heavy crude reservoir.For strong retraction oil reservoir, begin to take shape that strong retraction oil reservoir is coldly adopted, the heavy oil development supporting technology such as to handle up, but recovery ratio is only 10% ~ 20%, mean that the remaining oil of more than 80% is not plucked out of, substantial oil is detained underground, solves the problem improving recovery factor of heavy oil reservoir how further in the urgent need to new oil recovery technique.
Summary of the invention
The object of the present invention is to provide expansion-resisting agent assisted steam flooding to improve the method for water sensitivity recovery factor of heavy oil reservoir, what realize high-temperature steam and expansion-resisting agent " near-thermal is far anti-" meets effect, thus raising strong retraction recovery factor of heavy oil reservoir.
In order to reach above-mentioned purpose, present invention employs following technical scheme, expansion-resisting agent assisted steam flooding improves the method for water sensitivity recovery factor of heavy oil reservoir, comprises the following steps:
Inject mixed steam and expansion-resisting agent solution in steam injection well in heavy crude reservoir simultaneously;
Continuously separately again in steam injection well, inject steam.
Described expansion-resisting agent solution is, with preparation water, the mother liquor of high concentration is diluted to the expansion-resisting agent solution that concentration is 1%.
Described expansion-resisting agent solution and steam ratio are 1:5.
In steam injection well, inject mixing steam and expansion-resisting agent solution need to inject continuously to be no less than 110 days, expansion-resisting agent used is a kind of cationic expansion-resisting agent, expansion-resisting agent injection rate 1t/h, steam injection speed 5t/h, shaft bottom mass dryness fraction must be greater than 40%, and corresponding well head steam quality is greater than 85%.
During independent injection steam, steam injection speed 6t/h.
Independent injection steam needs 5-10, and vapor (steam) temperature is not less than 300 degree.
Described heavy crude reservoir is that formation pressure is down to below 5MPa, and oil reservoir buried depth 900 ~ 1600m, effective pay thickiness is not less than 6m, and under reservoir condition, viscosity of crude is greater than 100mPas, and permeability is greater than 200 × 10
-3μm
2oil reservoir.
Compared to prior art, the present invention has following beneficial effect:
The present invention is in strong retraction viscous oil field operated by steam process, further raising oil recovery factor provides a kind of new method, be applicable to after formation pressure is down to 5MPa, oil reservoir buried depth 900 ~ 1600m, effective pay thickiness is not less than 6m, under reservoir condition, viscosity of crude is greater than 100mPas, and saturating rate is greater than 200 × 10
-3μm
2oil reservoir.
The method is for strong retraction heavy crude reservoir, and under current technical background, exploitation can increase substantially the new technique of heavy crude reservoir oil recovery factor.The method is in steam-drive process, and adopt the mode of steam companion note to inject expansion-resisting agent in steam injection well, expansion-resisting agent and steam ratio are 1:5, and expansion-resisting agent implantation concentration is 1%.Steam is injected continuously, steam injection speed 6t/h after having noted expansion-resisting agent.What realize high-temperature steam and expansion-resisting agent " near-thermal is far anti-" meets effect, that is: near wellbore zone makes clay make the transition by high-temperature steam, and reduce reservoir water-sensitive degree, swollen technology is prevented in employing deep, well area far away, suppress reservoir water fire extinguishing, thus improve strong retraction recovery factor of heavy oil reservoir.
Accompanying drawing explanation
Fig. 1 is the displacement generalized section of expansion-resisting agent assisted steam flooding method.
Detailed description of the invention
Embodiment: WZ36-5-5 well group steam flooding is tested, and the oil reservoir residing for this well group is oil reservoir buried depth 900 ~ 1600m, and effective pay thickiness is not less than 6m, and under reservoir condition, viscosity of crude is greater than 100mPas, and saturating rate is greater than 200 × 10
-3μm
2oil reservoir.
(1) calculate the injection rate of expansion-resisting agent: WZ36-5-5 well group voids volume is 52.5Ham, and steam flooding swept volume is about about 0.5 times of well group voids volume, the injection rate calculating expansion-resisting agent by 0.5 times of voids volume should be 2625m
3.
(2) with preparation water the mother liquor of high concentration is diluted to that concentration is 1%, volume is 2625m
3expansion-resisting agent solution.
(3) expansion-resisting agent solution and steam are pressed 1:5 mixing and inject oil reservoir by steam injection well, inject 110 days continuously; Expansion-resisting agent used is a kind of cationic expansion-resisting agent, expansion-resisting agent injection rate 1t/h, steam injection speed 5t/h.
(4) steam is injected separately, steam injection speed 6t/h.
(5) according to steam flooding well group Production development, when occurring that vapour such as to alter at the phenomenon, Reasonable adjustment manufacturing parameter or inject chemical agent and adjust stifled.
Can find out that near near-thermal area, steam injection well side be high temperature water-sensitive zone of transformation according to Fig. 1, near producing well, anti-area far away is low temperature water-sensitive district, when steam injection, do not add expansion-resisting agent, the permeability retention rate in anti-area far away is only 12.1%, and after having added expansion-resisting agent, its permeability retention rate is increased to 64.4%, near wellbore zone makes clay make the transition by high-temperature steam, reduce reservoir water-sensitive degree, swollen technology is prevented in employing deep, well area far away, suppresses reservoir water fire extinguishing, thus improves the recovery ratio of strong retraction heavy crude reservoir producing well.
The foregoing is only preferred embodiment of the present invention, be not used to limit the scope of the claims of the present invention, other use the equivalence of patent spirit of the present invention to change, and all should all belong to the scope of the claims of the present invention.
Claims (7)
1. expansion-resisting agent assisted steam flooding improves the method for water sensitivity recovery factor of heavy oil reservoir, comprises the following steps:
Inject mixed steam and expansion-resisting agent solution in steam injection well in heavy crude reservoir simultaneously;
Continuously separately again in steam injection well, inject steam.
2. expansion-resisting agent assisted steam flooding according to claim 1 improves the method for water sensitivity recovery factor of heavy oil reservoir, it is characterized in that, described expansion-resisting agent solution is, with preparation water, the mother liquor of high concentration is diluted to the expansion-resisting agent solution that concentration is 1%.
3. expansion-resisting agent assisted steam flooding according to claim 1 improves the method for water sensitivity recovery factor of heavy oil reservoir, and it is characterized in that, described expansion-resisting agent solution and steam ratio are 1:5.
4. expansion-resisting agent assisted steam flooding according to claim 1 improves the method for water sensitivity recovery factor of heavy oil reservoir, it is characterized in that, in steam injection well, inject mixing steam and expansion-resisting agent solution need to inject continuously to be no less than 110 days, expansion-resisting agent used is a kind of cationic expansion-resisting agent, expansion-resisting agent injection rate 1t/h, steam injection speed 5t/h, shaft bottom mass dryness fraction must be greater than 40%, and corresponding well head steam quality is greater than 85%.
5. expansion-resisting agent assisted steam flooding according to claim 1 improves the method for water sensitivity recovery factor of heavy oil reservoir, it is characterized in that, when injecting separately steam, and steam injection speed 6t/h.
6. expansion-resisting agent assisted steam flooding according to claim 1 improves the method for water sensitivity recovery factor of heavy oil reservoir, it is characterized in that, injecting separately steam needs 5-10, and vapor (steam) temperature is not less than 300 degree.
7. expansion-resisting agent assisted steam flooding according to claim 1 improves the method for water sensitivity recovery factor of heavy oil reservoir, it is characterized in that, described heavy crude reservoir is that formation pressure is down to below 5MPa, oil reservoir buried depth 900 ~ 1600m, effective pay thickiness is not less than 6m, under reservoir condition, viscosity of crude is greater than 100mPas, and permeability is greater than 200 × 10
-3μm
2oil reservoir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410075571.1A CN104895540A (en) | 2014-03-04 | 2014-03-04 | A method of using an anti-swelling agent to help a steam flooding in improving the recovery ratio of water-sensitive heavy oil reservoirs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410075571.1A CN104895540A (en) | 2014-03-04 | 2014-03-04 | A method of using an anti-swelling agent to help a steam flooding in improving the recovery ratio of water-sensitive heavy oil reservoirs |
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| CN104895540A true CN104895540A (en) | 2015-09-09 |
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| CN201410075571.1A Pending CN104895540A (en) | 2014-03-04 | 2014-03-04 | A method of using an anti-swelling agent to help a steam flooding in improving the recovery ratio of water-sensitive heavy oil reservoirs |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115306361A (en) * | 2021-05-08 | 2022-11-08 | 中国石油化工股份有限公司 | Method for optimizing injection parameters of anti-swelling agent during conversion of oil reservoir into thermal chemical steam flooding |
Citations (4)
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|---|---|---|---|---|
| CN101871341A (en) * | 2010-06-13 | 2010-10-27 | 西安石油大学 | Method for improving thick oil recovery ratio |
| CN102644454A (en) * | 2012-04-19 | 2012-08-22 | 山东德仕化工集团有限公司 | Method for increasing recovery ratio of thick oil |
| CN103541708A (en) * | 2012-07-11 | 2014-01-29 | 中国石油化工股份有限公司 | Method for improving super-heavy oil steam flooding recovery efficiency |
| CN103541704A (en) * | 2012-07-11 | 2014-01-29 | 中国石油化工股份有限公司 | Method of improving deep super-thick oil reservoir recovery efficiency |
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2014
- 2014-03-04 CN CN201410075571.1A patent/CN104895540A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101871341A (en) * | 2010-06-13 | 2010-10-27 | 西安石油大学 | Method for improving thick oil recovery ratio |
| CN102644454A (en) * | 2012-04-19 | 2012-08-22 | 山东德仕化工集团有限公司 | Method for increasing recovery ratio of thick oil |
| CN103541708A (en) * | 2012-07-11 | 2014-01-29 | 中国石油化工股份有限公司 | Method for improving super-heavy oil steam flooding recovery efficiency |
| CN103541704A (en) * | 2012-07-11 | 2014-01-29 | 中国石油化工股份有限公司 | Method of improving deep super-thick oil reservoir recovery efficiency |
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| 周维洪等: "水敏性稠油油藏热采防膨剂评价与筛选", 《长江大学学报（自然科学版）》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115306361A (en) * | 2021-05-08 | 2022-11-08 | 中国石油化工股份有限公司 | Method for optimizing injection parameters of anti-swelling agent during conversion of oil reservoir into thermal chemical steam flooding |
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| CB02 | Change of applicant information |
Address after: 257000 Ji'nan Road, Dongying District, Shandong, No. 125, No. Applicant after: Sinopec Corp. Applicant after: Research Institute of Geological Sciences, Sinopec Shengli Oilfield Branch Company Address before: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Applicant before: Sinopec Corp. Applicant before: Research Institute of Geological Sciences, Sinopec Shengli Oilfield Branch Company |
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Application publication date: 20150909 |
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| RJ01 | Rejection of invention patent application after publication |