CN104895538A - A method for increasing the strongly water-sensitive heavy oil reservoir recovery ratio - Google Patents
A method for increasing the strongly water-sensitive heavy oil reservoir recovery ratio Download PDFInfo
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- CN104895538A CN104895538A CN201410075570.7A CN201410075570A CN104895538A CN 104895538 A CN104895538 A CN 104895538A CN 201410075570 A CN201410075570 A CN 201410075570A CN 104895538 A CN104895538 A CN 104895538A
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Abstract
The invention provides a method for increasing the strongly water-sensitive heavy oil reservoir recovery ratio. The method comprises the steps of injecting antiswelling solutions in a steam injection well in a heavy oil reservoir, the injection quantity of each period being 3-4t and the injection time being 2 hours; and continuously and independently injecting steam in the steam injection well. The antiswelling solutions are obtained by using preparation water to diluting mother solutions with high concentration until the concentration becomes 10%. The method is characterized in that the antiswelling agents are injected to facilitate steam huff and puff, thereby increasing the strongly water-sensitive heavy oil reservoir recovery ratio. At high temperature, the antiswelling agents can effectively restrain clay swelling, reduce the water sensitivity of reservoir strata, increase the oil layer permeability, increase the swept volume of steam and reduce the viscosity of crude oil, thereby increasing the strongly water-sensitive heavy oil reservoir recovery ratio.
Description
Technical field
The present invention relates to oil extraction in oil field technology, especially a kind of method improving strong retraction recovery factor of heavy oil reservoir.
Background technology
Viscous crude resource is extremely abundant in the world, and compared with wells in conventional heavy oil reservoir development technique, the Development of Viscous Crude Oil investigative technique of strong retraction perception has certain particularity, and Overall Formation Protection Techniques Used is crucial, and development difficulty is much larger than wells in conventional heavy oil reservoir.
Current heavy crude heat extraction mainly based on steam soak development scheme, sensitivity heavy oil reservoir due to clay content high, clay meet water expand, reservoir permeability degradation, cause steam injection makeup energy mode difficulty, production effect is undesirable.
Expansion-resisting agent is a kind of mixture of organic cationic polymer, and chain element contains multiple cation group, with latticed form strong adsorption on the exchange point of clay, and by the effect such as molecular separating force and hydrogen bond force, firmly can be adsorbed on surface of clay.This product has the effect obviously preventing reservoir CLAY MINERALS AND THEIR SIGNIFICANCE hydration swelling and dispersion migration, and the apparent water injectivity index of oil-field flooding is increased substantially.Molecular weight product is suitable, is applicable to height and blends hypotonic oil-gas Layer, and the rigid structures of its uniqueness, clay mineral interlayer can be entered, under the effect of number of chemical power, reach efficient stable effect.
For this reason, we have invented and handle up improve the new method of strong retraction recovery factor of heavy oil reservoir by injecting a kind of SLAS-03 expansion-resisting agent auxiliary steam, solve strong retraction Development of Viscous Crude Oil Problems existing.
Summary of the invention
The object of the present invention is to provide a kind of method improving strong retraction recovery factor of heavy oil reservoir, carry out auxiliary steam by injection expansion-resisting agent to handle up, improve strong retraction recovery factor of heavy oil reservoir, expansion-resisting agent at high temperature effectively can suppress clay swell, reduce reservoir water-sensitive degree, improve reservoir permeability, strengthen the swept volume of steam, reduce viscosity of crude, thus improve strong retraction recovery factor of heavy oil reservoir.
In order to reach above-mentioned purpose, present invention employs following technical scheme, a kind of method improving strong retraction recovery factor of heavy oil reservoir, comprises the following steps:
Expansion-resisting agent solution is injected in steam injection well in heavy crude reservoir; Each cycle injection rate 3 ~ 4t, injection length 2 hours;
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 10%.
Expansion-resisting agent main component in described expansion-resisting agent solution is multi-functional Small molecular organic ammonium salt, synthesizes obtained by organic cationic polymer and Small molecular inorganic ammonium salt.
During independent injection steam, the cyclic steam injection volume of steam soak is 2000-2500t, and the steam injection time is 10 days, steam injection speed is 7t/h ~ 10t/h, Wellhead steam injection mass dryness fraction >=70%, and steam injection terminates rear vexed well 3 days, then drive a well open flow, operation, produces to proceed to next after 1 year and handle up the cycle.
Described heavy crude reservoir 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 100mPa.s, and reservoir permeability is greater than 200 × 10
-3μm
2strong retraction heavy crude reservoir.
Compared to prior art, the present invention has following beneficial effect:
The invention provides a kind of SLAS-03 expansion-resisting agent auxiliary steam to handle up and improve the new method of strong retraction recovery factor of heavy oil reservoir, be applicable to oil reservoir buried depth 900 ~ 1600m, effective pay thickiness is not less than 6m, and under reservoir condition, viscosity of crude is greater than 100mPa.s, and reservoir permeability is greater than 200 × 10
-3μm
2strong retraction heavy crude reservoir.Under expansion-resisting agent normal temperature in the present invention, anti-dilative can reach 88%, and under high temperature, anti-dilative can reach 94%, and has certain governance role to the reservoir after sensitivity.
The method is low for permeability, that clay content is high, water sensitivity is strong strong retraction heavy crude reservoir, and under current technical background, exploitation can increase substantially the technology of recovery factor of heavy oil reservoir.SLAS-03 expansion-resisting agent at high temperature effectively can suppress clay swell, reduces reservoir water-sensitive degree, improves reservoir permeability, strengthen the swept volume of steam, reduce viscosity of crude, thus improve strong retraction recovery factor of heavy oil reservoir.
Detailed description of the invention
Embodiment 1:WZ36-6X1 well note expansion-resisting agent auxiliary steam is handled up, 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 100mPa.s, and reservoir permeability is greater than 200 × 10
-3μm
2strong retraction heavy crude reservoir.
(1) preposed attributives SLAS-03 expansion-resisting agent 3t, expansion-resisting agent concentration is 10%(quality), injection length 2h.
(2) continuous steam injection 10 days, steam injection amount 2000t, steam injection rate 7t/h, steam injection mass dryness fraction 70%.
(3) steam injection terminates rear vexed well 3 days, then open flow, operation.
(4) produce and proceed to next after 1 year and handle up the cycle.
Wherein SLAS-03 expansion-resisting agent main component is multi-functional Small molecular organic ammonium salt, synthesizes obtained by organic cationic polymer and Small molecular inorganic ammonium salt.Under expansion-resisting agent normal temperature in the present invention, anti-dilative can reach 88%, and under high temperature, anti-dilative can reach 94%, and has certain governance role to the reservoir after sensitivity.SLAS-03 expansion-resisting agent at high temperature effectively can suppress clay swell, reduces reservoir water-sensitive degree, improves reservoir permeability, strengthen the swept volume of steam, reduce viscosity of crude, thus improve strong retraction recovery factor of heavy oil reservoir.
Embodiment 2:WZ36-10X9 well note expansion-resisting agent auxiliary steam is handled up, 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 100mPa.s, and reservoir permeability is greater than 200 × 10
-3μm
2strong retraction heavy crude reservoir.
(1) preposition SLAS-03 expansion-resisting agent 3.8t, expansion-resisting agent concentration is 10%(quality), injection length 2.5h.
(2) continuous steam injection 10 days, steam injection amount 2500t, steam injection rate 8t/h, steam injection mass dryness fraction 70%.
(3) steam injection terminates rear vexed well 3 days, then open flow, operation.
(4) produce and proceed to next after 1 year and handle up the cycle.
Under expansion-resisting agent normal temperature in the present invention, anti-dilative can reach 88%, and under high temperature, anti-dilative can reach 94%, and has certain governance role to the reservoir after sensitivity.SLAS-03 expansion-resisting agent at high temperature effectively can suppress clay swell, reduces reservoir water-sensitive degree, improves reservoir permeability, strengthen the swept volume of steam, reduce viscosity of crude, thus improve strong retraction recovery factor of heavy oil reservoir.
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 (5)
1. improve a method for strong retraction recovery factor of heavy oil reservoir, comprise the following steps:
Expansion-resisting agent solution is injected in steam injection well in heavy crude reservoir; Each cycle injection rate 3 ~ 4t, injection length 2 hours;
Continuously separately again in steam injection well, inject steam.
2. a kind of method improving strong retraction recovery factor of heavy oil reservoir according to claim 1, 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 10%.
3. a kind of method improving strong retraction recovery factor of heavy oil reservoir according to claim 1, it is characterized in that, expansion-resisting agent main component in described expansion-resisting agent solution is multi-functional Small molecular organic ammonium salt, synthesizes obtained by organic cationic polymer and Small molecular inorganic ammonium salt.
4. a kind of method improving strong retraction recovery factor of heavy oil reservoir according to claim 1, it is characterized in that, during independent injection steam, the cyclic steam injection volume of steam soak is 2000-2500t, and the steam injection time is 10 days, and steam injection speed is 7t/h ~ 10t/h, Wellhead steam injection mass dryness fraction >=70%, steam injection terminates rear vexed well 3 days, and then drive a well open flow, operation, produces to proceed to next after 1 year and handle up the cycle.
5. a kind of method improving strong retraction recovery factor of heavy oil reservoir according to claim 1, it is characterized in that, described heavy crude reservoir is oil reservoir buried depth 900 ~ 1600m, and effective pay thickiness is not less than 6m, under reservoir condition, viscosity of crude is greater than 100mPa.s, and reservoir permeability is greater than 200 × 10
-3μm
2strong retraction heavy crude reservoir.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735957A (en) * | 2016-03-10 | 2016-07-06 | 胡海军 | Injection method capable of increasing steam huff and puff recovery ratio of heavy oil well |
| CN107956460A (en) * | 2017-10-27 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of method that oil reservoir water-sensitive is reduced using modified function microorganism |
| CN110541692A (en) * | 2019-08-29 | 2019-12-06 | 中国石油化工股份有限公司 | Chemical oil displacement method suitable for super-strong water-sensitive heavy oil reservoir |
| CN113803037A (en) * | 2020-06-12 | 2021-12-17 | 中国石油化工股份有限公司 | Deep low-permeability thickened oil fluidity regulation and control displacement development method |
| CN114059978A (en) * | 2020-08-03 | 2022-02-18 | 中国石油化工股份有限公司 | Chemical cold-production method for strong water-sensitive heavy oil reservoir |
| CN115405281A (en) * | 2021-05-28 | 2022-11-29 | 中国石油化工股份有限公司 | Yield increasing method for medium-low permeability strong water-sensitive thick oil well |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735957A (en) * | 2016-03-10 | 2016-07-06 | 胡海军 | Injection method capable of increasing steam huff and puff recovery ratio of heavy oil well |
| CN107956460A (en) * | 2017-10-27 | 2018-04-24 | 中国石油化工股份有限公司 | A kind of method that oil reservoir water-sensitive is reduced using modified function microorganism |
| CN107956460B (en) * | 2017-10-27 | 2020-07-03 | 中国石油化工股份有限公司 | Method for reducing water sensitivity of oil reservoir by using modified functional microorganisms |
| CN110541692A (en) * | 2019-08-29 | 2019-12-06 | 中国石油化工股份有限公司 | Chemical oil displacement method suitable for super-strong water-sensitive heavy oil reservoir |
| CN113803037A (en) * | 2020-06-12 | 2021-12-17 | 中国石油化工股份有限公司 | Deep low-permeability thickened oil fluidity regulation and control displacement development method |
| CN113803037B (en) * | 2020-06-12 | 2023-03-28 | 中国石油化工股份有限公司 | Deep low-permeability thickened oil fluidity regulation and control displacement development method |
| CN114059978A (en) * | 2020-08-03 | 2022-02-18 | 中国石油化工股份有限公司 | Chemical cold-production method for strong water-sensitive heavy oil reservoir |
| CN115405281A (en) * | 2021-05-28 | 2022-11-29 | 中国石油化工股份有限公司 | Yield increasing method for medium-low permeability strong water-sensitive thick oil well |
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Application publication date: 20150909 |