CN104847322A - Method for improving recovery efficiency for deep common thickened oil water drive-converting into-steam flooding - Google Patents
Method for improving recovery efficiency for deep common thickened oil water drive-converting into-steam flooding Download PDFInfo
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- CN104847322A CN104847322A CN201410054218.5A CN201410054218A CN104847322A CN 104847322 A CN104847322 A CN 104847322A CN 201410054218 A CN201410054218 A CN 201410054218A CN 104847322 A CN104847322 A CN 104847322A
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Classifications
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- 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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- 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
- E21B43/20—Displacing by water
Abstract
The invention discloses a method for improving recovery efficiency for deep common thickened oil water drive-converting into-steam flooding. The method comprises stopping injecting water into a water injection well after water drive for a thickened oil reservoir inner well and common thickened oil water-containing reaching 90%, then transferring into producing well regular production, encrypting a new thermal production well on a water drive bypass line for steam huff and puff exploitation, and continuously injecting steam into an oil layer by a steam injection well after oil layer pressure decreased under 9 MPa. The steam injected by the steam injection well is high dry steam with outlet dry degree more than 95% and produced by a high dry boiler; the steam injection well employs a high efficient heat-insulating pipe column with thermal loss per kilometer of 5%; and shaft bottom dry degree is no less than 60%. Unfavorable effects on steam drive by high water-containing rate and high pressure of the stratum after water drive are overcome via flow line conversion and high dry degree steam, so effective steam drive of common thickened oil reservoir after water drive can be achieved even with high water-containing rate (no less than 90%) and high pressure (7 to 9MPa); limitations to steam drive due to high pressure and high water-containing rate of deep water drive thickened oil stratum can be eliminated; and common thickened oil reservoir crude oil recovery efficiency after water drive can be greatly improved.
Description
Technical field
The present invention relates to oil extraction in oil field technology, turn steam flooding after especially a kind of deep layer common heavy oil water drive and improve recovery ratio method.
Background technology
Domestic have abundant common heavy oil resource (formation condition viscosity >50mPas), immature in early days due to thermal recovery technology, based on waterflooding extraction, by the impact of viscosity of crude, water drive common heavy oil recovery ratio is low, as oil viscosity >150mPas, and the general <20% of recovery ratio, mean that more than 80% crude oil is detained underground, improve the recovery ratio of such oil reservoir in the urgent need to conversion development scheme.
Just heat extraction by steam injection is applied in the exploitation of thin oil or heavy crude reservoir after water drive, to improve its recovery ratio since the external sixties.The water drive abroad implemented at present turns steam flooding heavy crude reservoir and is shallow-layer, and reservoir buried depth is generally at 300 ~ 800m, and the most shallow only has 142m, the general <5MPa of reservoir pressure.Compared with external reservoir condition, domestic water drive common heavy oil reservoir is mostly deep layer, the general >900m of reservoir buried depth, strata pressure high (> 10MPa), moisture height (comprehensive water cut is generally more than 90%) after water drive, add the development difficulty turning steam flooding, after also there is no deep layer common heavy oil water drive both at home and abroad at present, turn the correlative study of steam flooding.
Summary of the invention
Turn steam flooding after the object of the present invention is to provide deep layer common heavy oil water drive and improve recovery ratio method, overcome the moisture height in stratum, the high adverse effect to steam flooding of pressure after water drive, realize the effective steam flooding under comparatively High water cut (>=90%) and elevated pressures (7 ~ 9MPa) condition of common heavy oil reservoir after water drive, having broken high, the moisture height of deep layer water drive viscous crude strata pressure can not the constraint of steam flooding, can increase substantially common heavy oil reservoir oil recovery factor after water drive.
In order to reach above-mentioned purpose, present invention employs following technical scheme, turning steam flooding after deep layer common heavy oil water drive and improving recovery ratio method, comprising the following steps:
After in heavy crude reservoir, well pattern carries out water drive, common heavy oil is moisture to be reached after 90%, and water injection well stops water filling, transfers Production Wells to, encrypts new thermal production well simultaneously, carry out cyclic steam stimulation on water drive shunt line;
Treat that formation pressure is down to below 9MPa, inject steam to oil reservoir continuously by steam injection well.
Described steam injection well injects the high-quality steam that steam is the outlet mass dryness fraction more than 95% that high mass dryness fraction boiler produces.
Described steam injection well uses effectively insulating tubing string, and km heat loss rate is 5%, shaft bottom steam quality >=60%.
As water injection well and the OW employing usual manner completion of water drive, and casing strength is lower, holds and can't stand high-temperature steam, can not as steam injection well, and steam injection can only use the thermal production well of new encryption and can not use water injection well or the inside steam injection of OW.
Control Discharge rate can be used as producing well utilize according to adopt liquid temp when steam flooding as the water injection well of water drive and OW.
Described water drive shunt line is the shunt line formed between old well and OW, encrypts new thermal production well in shunt line centre.
Described heavy crude reservoir be remaining oil saturation more than 0.4, more than effective thickness 4.5m, pure always than more than 0.36, water oil volume than lower than 5, the sluggish water drive common heavy oil reservoir of edge-bottom water.
Compared to prior art, the present invention has following beneficial effect:
The present invention can provide one significantly to improve oil recovery factor method for deep water drives common heavy oil reservoir development late stage, be applicable to remaining oil saturation more than 0.4, more than effective thickness 4.5m, pure always than more than 0.36, water oil volume than lower than 5, the sluggish water drive common heavy oil reservoir of edge-bottom water.
Relatively traditional steam flooding technology, because shaft bottom steam flooding mass dryness fraction can only reach 40%, require when therefore implementing steam flooding that strata pressure is lower than 5MPa, the invention provides a kind of high steam and drive method, the steam of mass dryness fraction more than 60% is injected by high mass dryness fraction boiler, can obtain under 7MPa and 40% mass dryness fraction, specific volume (vapor chamber) identical under 5MPa and higher steam enthalpy.Simultaneously by encrypting at water drive shunt line, realize unsteady flow line displacement in plane, avoid High water cut region, thus the moisture height in stratum, the high adverse effect to steam flooding of pressure after overcoming water drive, realize the effective steam flooding under comparatively High water cut (>=90%) and elevated pressures (7 ~ 9MPa) condition of common heavy oil reservoir after water drive, having broken high, the moisture height of deep layer water drive viscous crude strata pressure can not the constraint of steam flooding, can increase substantially common heavy oil reservoir oil recovery factor more than 20% after water drive.
Accompanying drawing explanation
Fig. 1 is that water drive turns different steam flooding well network plane streamline transformation schematic diagram.
In figure, 1, OW; 2, old well; 3, newly thermal production well is bored.
Detailed description of the invention
The present invention provides anti-9 Pattern Well Networks and turns steam flooding embodiment, is explained below in conjunction with accompanying drawing.
Embodiment 1
When to describe common heavy oil water drive well pattern in figure be anti-9 area well groups of a 200 × 283m, prediction water drive ultimate recovery is 23.2%.Water drive moisture to 90% after, central water flooding well stops water filling, transfer Production Wells to, conventional OW still keeps producing, the horizontal well that encryption 4 mouthfuls is new on water drive shunt line simultaneously, form the horizontal well inverted five spot thermal recovery well pattern of a 141 × 200m, the horizontal well thermal recovery cyclic steam stimulation of encryption, adopt high vacuum insulation pipe, the heat insulation box cupling sealer of instlated tubular, force the totally-enclosed of deblocking packer, heat insulation compensator without focus steam injection technology.Because old well stops, stratum noenergy is supplemented, the genus blowdown and the horizontal well steam injection of newly encrypting is handled up, and horizontal well lifting rate is larger, stratum energy can constantly decline, treat that formation pressure is down to about 7MPa, adopt high mass dryness fraction boiler continuously to 4 mouthfuls of water horizontal wells inject outlet mass dryness fractions up to more than 95% steam.Predict that this horizontal well inverted five spot well pattern steam flooding ultimate recovery can reach 41.2%, improve 18% than water drive, gas oil ratio 0.17.
Embodiment 2
Anti-9 area water drive well group water drives moisture to 90% after, central water flooding well stops water filling, transfer Production Wells to, conventional OW still keeps producing, the straight well that encryption 4 mouthfuls is new on water drive shunt line simultaneously, form the inverted five spot thermal recovery well pattern of a 141 × 200m, the horizontal well thermal recovery cyclic steam stimulation of encryption, adopt high vacuum insulation pipe, the heat insulation box cupling sealer of instlated tubular, force the totally-enclosed of deblocking packer, heat insulation compensator without focus steam injection technology.Because old well stops, stratum noenergy is supplemented, the genus blowdown and the horizontal well steam injection of newly encrypting is handled up, and horizontal well lifting rate is larger, stratum energy can constantly decline, treat that formation pressure is down to about 7MPa, adopt high mass dryness fraction boiler continuously to 4 mouthfuls of water horizontal wells inject outlet mass dryness fractions up to more than 95% steam.Predict that this horizontal well inverted five spot well pattern steam flooding ultimate recovery can reach 43.8%, improve 20.6% than water drive, gas oil ratio 0.19.
Embodiment 3
Anti-9 area water drive well group water drives moisture to 90% after, central water flooding well stops water filling, transfer Production Wells to, conventional OW still keeps producing, the straight well that encryption 4 mouthfuls is new on water drive shunt line simultaneously, form anti-9 thermal recovery well patterns of a 141 × 200m, the horizontal well thermal recovery cyclic steam stimulation of encryption, adopt high vacuum insulation pipe, the heat insulation box cupling sealer of instlated tubular, force the totally-enclosed of deblocking packer, heat insulation compensator without focus steam injection technology.Because old well stops, stratum noenergy is supplemented, the genus blowdown and the horizontal well steam injection of newly encrypting is handled up, and horizontal well lifting rate is larger, stratum energy can constantly decline, treat that formation pressure is down to about 7MPa, adopt high mass dryness fraction boiler continuously to 4 mouthfuls of water horizontal wells inject outlet mass dryness fractions up to more than 95% steam.Predict that this horizontal well inverted five spot well pattern steam flooding ultimate recovery can reach 47.6%, improve 24.4% than water drive, gas oil ratio 0.21.
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. turn steam flooding after deep layer common heavy oil water drive and improve recovery ratio method, comprise the following steps:
After in heavy crude reservoir, well pattern carries out water drive, common heavy oil is moisture to be reached after 90%, and water injection well stops water filling, transfers Production Wells to, encrypts new thermal production well simultaneously, carry out cyclic steam stimulation on water drive shunt line;
Treat that formation pressure is down to below 9MPa, inject steam to oil reservoir continuously by steam injection well.
2. turn steam flooding after deep layer common heavy oil water drive according to claim 1 and improve recovery ratio method, it is characterized in that, described steam injection well injects the high-quality steam that steam is the outlet mass dryness fraction more than 95% that high mass dryness fraction boiler produces.
3. turn steam flooding after deep layer common heavy oil water drive according to claim 1 and improve recovery ratio method, it is characterized in that, described steam injection well uses effectively insulating tubing string, and km heat loss rate is 5%, shaft bottom steam quality >=60%.
4. turn steam flooding after deep layer common heavy oil water drive according to claim 1 and improve recovery ratio method, it is characterized in that, as water injection well and the OW employing usual manner completion of water drive, and casing strength is lower, hold and can't stand high-temperature steam, can not as steam injection well, steam injection can only use the thermal production well of new encryption and can not use water injection well or the inside steam injection of OW.
5. turn steam flooding after deep layer common heavy oil water drive according to claim 1 and improve recovery ratio method, it is characterized in that, control Discharge rate can be used as producing well utilization according to adopt liquid temp when steam flooding as the water injection well of water drive and OW.
6. turn steam flooding after deep layer common heavy oil water drive according to claim 1 and improve recovery ratio method, it is characterized in that, described water drive shunt line is the shunt line formed between old well and OW, encrypts new thermal production well in shunt line centre.
7. turn steam flooding after deep layer common heavy oil water drive according to claim 1 and improve recovery ratio method, it is characterized in that, described heavy crude reservoir be remaining oil saturation more than 0.4, more than effective thickness 4.5m, pure always than more than 0.36, water oil volume than lower than 5, the sluggish water drive common heavy oil reservoir of edge-bottom water.
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| CN201410054218.5A CN104847322A (en) | 2014-02-18 | 2014-02-18 | Method for improving recovery efficiency for deep common thickened oil water drive-converting into-steam flooding |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650900A (en) * | 2015-12-30 | 2016-06-08 | 中海阳能源集团股份有限公司 | Groove type solar high-temperature heat collecting device and method for thickened oil steam injection production through groove type solar high-temperature heat collecting device |
| CN107201891A (en) * | 2017-07-27 | 2017-09-26 | 中国海洋石油总公司 | A kind of handled up follow-up turn suitable for offshore viscous oil field drives the method developed |
| CN109403935A (en) * | 2018-09-30 | 2019-03-01 | 中海石油(中国)有限公司 | A kind of oil-sand SAGD Encryption Well oil increment calculation method |
| CN110485988A (en) * | 2019-08-19 | 2019-11-22 | 中国石油天然气股份有限公司大港油田分公司 | A kind of low permeability reservoir simulation grid refinement method and device |
| CN112709558A (en) * | 2019-10-25 | 2021-04-27 | 中国石油天然气股份有限公司 | Method for determining deployment position of steam injection well and method for converting oil reservoir from water drive to steam drive |
| CN112943230A (en) * | 2021-02-05 | 2021-06-11 | 中国石油化工股份有限公司 | Residual oil distribution prediction method for common heavy oil reservoir |
| CN115182710A (en) * | 2021-11-17 | 2022-10-14 | 中国石油大学(华东) | Method for improving thick oil thermal recovery development effect by using aerogel nano fluid |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650900A (en) * | 2015-12-30 | 2016-06-08 | 中海阳能源集团股份有限公司 | Groove type solar high-temperature heat collecting device and method for thickened oil steam injection production through groove type solar high-temperature heat collecting device |
| CN105650900B (en) * | 2015-12-30 | 2018-08-21 | 中海阳能源集团股份有限公司 | A kind of groove type solar high-temperature heat-gathering device and its method for heavy oil steam injection recovery |
| CN107201891A (en) * | 2017-07-27 | 2017-09-26 | 中国海洋石油总公司 | A kind of handled up follow-up turn suitable for offshore viscous oil field drives the method developed |
| CN109403935A (en) * | 2018-09-30 | 2019-03-01 | 中海石油(中国)有限公司 | A kind of oil-sand SAGD Encryption Well oil increment calculation method |
| CN109403935B (en) * | 2018-09-30 | 2020-10-09 | 中海石油(中国)有限公司 | Oil yield calculation method for oil sand SAGD encrypted well |
| CN110485988A (en) * | 2019-08-19 | 2019-11-22 | 中国石油天然气股份有限公司大港油田分公司 | A kind of low permeability reservoir simulation grid refinement method and device |
| CN112709558A (en) * | 2019-10-25 | 2021-04-27 | 中国石油天然气股份有限公司 | Method for determining deployment position of steam injection well and method for converting oil reservoir from water drive to steam drive |
| CN112943230A (en) * | 2021-02-05 | 2021-06-11 | 中国石油化工股份有限公司 | Residual oil distribution prediction method for common heavy oil reservoir |
| CN115182710A (en) * | 2021-11-17 | 2022-10-14 | 中国石油大学(华东) | Method for improving thick oil thermal recovery development effect by using aerogel nano fluid |
| CN115182710B (en) * | 2021-11-17 | 2023-07-14 | 中国石油大学(华东) | Method for improving thick oil thermal recovery development effect by aerogel nano fluid |
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Application publication date: 20150819 |