CN104818978A - One-well multi-control method for offshore low-permeability reservoir thick oil layer exploitation - Google Patents
One-well multi-control method for offshore low-permeability reservoir thick oil layer exploitation Download PDFInfo
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- CN104818978A CN104818978A CN201510103268.2A CN201510103268A CN104818978A CN 104818978 A CN104818978 A CN 104818978A CN 201510103268 A CN201510103268 A CN 201510103268A CN 104818978 A CN104818978 A CN 104818978A
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- well
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- water
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000003921 oil Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000005516 engineering process Methods 0.000 claims abstract description 6
- 239000010779 crude oil Substances 0.000 claims abstract description 4
- 230000035699 permeability Effects 0.000 claims description 11
- 241000209094 Oryza Species 0.000 claims description 10
- 235000007164 Oryza sativa Nutrition 0.000 claims description 10
- 235000009566 rice Nutrition 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 10
- 239000007924 injection Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 8
- 238000005457 optimization Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002356 single layer Substances 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- E21B43/20—Displacing by water
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a one-well multi-control method for an offshore low-permeability reservoir single relatively thick oil layer. The method at least uses a long section horizontal well and a plurality of artificial fractures located between an oil layer top and an oil layer bottom, wherein the extension direction of a well section of the horizontal well is the maximum principal stress direction of a stratum; the artificial fracture surfaces are vertical to the horizontal well section and extend along the minor principal stress direction; injection and recovery are carried out simultaneously by implementing an offshore same-well injection and recovery technology in the horizontal well; injection water is firstly injected into the artificial fracture at the farthest end from the root of the horizontal well section; the injection water drives crude oil to enter the closest artificial fracture to enter a wellbore so as to be recovered; and when the far end artificial fractures are flooded by water in succession and water plugging is invalid, conversion is carried out in sequence from a far end to a close end. According to the method, the well building cost is reduced; the injection effect is improved; the distance between adjacent artificial fractures is adjusted, so that the small-well-distance water injection is realized, the displacement pressure gradient is favorably built, the start pressure difference is overcome, and the oil recovery effect is increased.
Description
Technical field
The present invention relates to a kind of multi-control method of a well of marine LOW PERMEABILITY RESERVOIR thick oil pay exploitation.
Background technology
Because offshore oil and gas field is in marine environment, production facility and production well need to concentrate on offshore production platform or wellhead platform, due to platform construction with has bored the conditions such as investment is huge and limit, offshore oil and gas field can only adopt a limited number of well to realize exploitation, and its recovery percent of reserves, rate of oil production and economy are subject to a definite limitation.
When developing marine low-permeability oil deposit, because reservoir permeability is poor, oil gas is more difficult in underground flowing, developable petroleum resources in a bite well control range is less, and offshore oil and gas field cannot utilize the method for land low-permeability oilfield many brills producing well and water injection well to change due to facility and investment limitation.
Therefore, invent marine LOW PERMEABILITY RESERVOIR to utilize a bite well to control and develop and descend the method for petroleum resources to seem more urgent more.
Summary of the invention
The object of the invention is a kind of multi-control method of a well providing marine LOW PERMEABILITY RESERVOIR thick oil pay exploitation; Utilize a bite well to realize and control and develop the method descending resource more, it is more suitable for the relatively large oil reservoir of thickness in monolayer.
Marine LOW PERMEABILITY RESERVOIR individual layer of the present invention is compared with the multi-control method of thick oil pay one well, the long section horizontal well of a bite between at least comprising bottom top of oil horizon and oil reservoir and many man-made fractures, Horizontal Well section bearing of trend is stratum biggest principal stress direction, man-made fracture face is perpendicular to net horizontal section and extend along minimum principal stress direction, implements marine ripe single-well injection-production technology and realize note and adopt and carry out simultaneously in horizontal well; Inject water first to inject from the man-made fracture of net horizontal section distance root distalmost end, inject water-driven crude oil and enter nearest man-made fracture and finally enter pit shaft and extraction, when far-end man-made fracture in succession water logging and water blockoff invalid after, from as far as nearly metaideophone successively.
Long well section horizontal section length of the present invention is determined depending on reservoir situation and the optimization of construction operation difficulty, unfixing restriction.
Man-made fracture number of the present invention and crack scale are determined depending on reservoir situation and the optimization of construction operation difficulty, unfixing restriction.
Distance between man-made fracture of the present invention, adopts parameter depending on reservoir conditions, construction operation difficulty and note and is optimized and determines, fixing restriction.
The present invention exploitation marine LOW PERMEABILITY RESERVOIR reduce costs and the effect improved in development effectiveness is significant.Far-end injects, near-end recovers the oil, about can reducing shaft building cost half to utilize the present invention to achieve in a bite well.And, because injection water injects along man-made fracture section, the increase of water suction area not only improves injection effect, and by regulating the distance between man-made fracture, can realize dense well spacing water filling, being more conducive to set up displacement pressure degree of passing, overcome switch DP and increase oil recovery effect.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Wherein: bottom 1 long section horizontal well, 2 tops of oil horizon, 3 oil reservoirs, 4 man-made fractures, 5 man-made fractures, 6 man-made fractures, 7 man-made fractures, 8 man-made fractures;
Detailed description of the invention
Marine LOW PERMEABILITY RESERVOIR individual layer of the present invention is compared with the multi-control method of thick oil pay one well, at least comprise the long section horizontal well 1 of a bite bottom top of oil horizon 2 and oil reservoir between 3 and many man-made fractures 4, man-made fracture 5, man-made fracture 6, man-made fractures 7, Horizontal Well section 11 bearing of trend is stratum biggest principal stress direction, the fracture surface of man-made fracture 4, man-made fracture 5, man-made fracture 6, man-made fracture 7 is perpendicular to Horizontal Well section 11 and extend along minimum principal stress direction, implements marine ripe single-well injection-production technology and realize note and adopt and carry out simultaneously in horizontal well.Inject water first to inject from the man-made fracture 4 of net horizontal section distance root distalmost end, inject water 8 and drive crude oil 9 to enter nearest man-made fracture 5 and finally enter pit shaft and extraction.When far-end man-made fracture in succession water logging and water blockoff invalid after, can from as far as nearly metaideophone successively.
Long well section Horizontal Well section 11 length of the present invention is determined depending on reservoir situation and the optimization of construction operation difficulty.
When well depth is at 1000-1500 rice, Forecast Oil Reservoir Distribution daily output is in 600-800 side, and core intersection is at 60-80 rice, then horizontal section length should at 300-500 rice, and as special in formation condition (lithology, physical property etc.) increases difficulty of construction, then need further optimization.
Man-made fracture 4 of the present invention, man-made fracture 5, man-made fracture 6, man-made fracture 7 number and crack scale are determined depending on reservoir situation and the optimization of construction operation difficulty.
Horizontal section length is 300-500 rice, then man-made fracture number 2-3 bar, and man-made fracture spacing should be 130-150 rice.
Distance between man-made fracture 4 of the present invention, man-made fracture 5, man-made fracture 6, man-made fracture 7, adopts parameter depending on reservoir conditions, construction operation difficulty and note and is optimized and determines, fixing restriction.
Man-made fracture is formed by the mode of pressure break, and multistage fracturing technology is comparatively ripe;
The technique of same well oil extraction gas injection, water filling applies for national inventing patent, and announces (patent No.: CN101265802, classification number: E21B43/18 (2006.01) I).
Claims (3)
1. a marine LOW PERMEABILITY RESERVOIR individual layer is compared with the multi-control method of thick oil pay one well, it is characterized in that: the long section horizontal well of a bite between at least comprising bottom top of oil horizon and oil reservoir and many man-made fractures, Horizontal Well section bearing of trend is stratum biggest principal stress direction, man-made fracture face is perpendicular to net horizontal section and extend along minimum principal stress direction, implements marine single-well injection-production technology and realize note and adopt and carry out simultaneously in horizontal well; Inject water first to inject from the man-made fracture of net horizontal section distance root distalmost end, inject water-driven crude oil and enter nearest man-made fracture and enter pit shaft and extraction, when far-end man-made fracture in succession water logging and water blockoff invalid after, from as far as nearly metaideophone successively.
2. marine LOW PERMEABILITY RESERVOIR individual layer according to claim 1 is compared with the multi-control method of thick oil pay one well, it is characterized in that: long section horizontal well is when well depth is at 1000-1500 rice, Forecast Oil Reservoir Distribution daily output is in 600-800 side, and core intersection is at 60-80 rice, then horizontal section length should at 300-500 rice.
3. marine LOW PERMEABILITY RESERVOIR individual layer according to claim 1 is compared with the multi-control method of thick oil pay one well, it is characterized in that: when horizontal section length is 300-500 rice, then man-made fracture number 2-3 bar, man-made fracture spacing should be 130-150 rice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510103268.2A CN104818978A (en) | 2015-03-10 | 2015-03-10 | One-well multi-control method for offshore low-permeability reservoir thick oil layer exploitation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510103268.2A CN104818978A (en) | 2015-03-10 | 2015-03-10 | One-well multi-control method for offshore low-permeability reservoir thick oil layer exploitation |
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| Publication Number | Publication Date |
|---|---|
| CN104818978A true CN104818978A (en) | 2015-08-05 |
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|---|---|---|---|
| CN201510103268.2A Pending CN104818978A (en) | 2015-03-10 | 2015-03-10 | One-well multi-control method for offshore low-permeability reservoir thick oil layer exploitation |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422057A (en) * | 2015-12-31 | 2016-03-23 | 中国石油天然气股份有限公司 | Oil extraction method for ultra-low permeability oil reservoir or compact oil reservoir |
| CN105545272A (en) * | 2015-12-31 | 2016-05-04 | 中国石油天然气股份有限公司 | Oil extraction method for ultra-low permeability water-sensitive reservoir/compact reservoir |
| CN105587300A (en) * | 2015-12-31 | 2016-05-18 | 中国石油天然气股份有限公司 | Oil recovery method for horizontal well |
| CN105863569A (en) * | 2016-04-14 | 2016-08-17 | 中国石油大学(华东) | Single-well fracture gravity self-circulation dry-hot-rock geotherm mining method |
| CN106246150A (en) * | 2016-09-18 | 2016-12-21 | 中国石油天然气股份有限公司 | Oil field fracturing transformation method |
| CN109025940A (en) * | 2018-08-06 | 2018-12-18 | 中国石油大学(华东) | A kind of CO for compact oil reservoir2Pressure break displacement of reservoir oil integration oil production method |
| CN110259421A (en) * | 2019-05-23 | 2019-09-20 | 中国石油天然气股份有限公司 | Fractured compact oil reservoir water injection energy supplementing method |
| CN111948029A (en) * | 2020-09-18 | 2020-11-17 | 中南大学 | Rock mass ground stress measuring method and tensile strength uniformity measuring method |
| CN113530499A (en) * | 2020-04-21 | 2021-10-22 | 中国石油天然气股份有限公司 | Perforating method and perforating device for shale oil-gas horizontal well with small well spacing |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3664418A (en) * | 1970-03-17 | 1972-05-23 | Valery Isaakovich Graifer | Method for the development of oil fields having zonally non-uniform collector properties |
| CN102628353A (en) * | 2012-03-21 | 2012-08-08 | 中国海洋石油总公司 | Well pattern adjustment and well pattern encryption method applied to on-sea hypotonic oil deposit exploitation |
| US20130228337A1 (en) * | 2012-03-01 | 2013-09-05 | Shell Oil Company | Fluid injection in light tight oil reservoirs |
-
2015
- 2015-03-10 CN CN201510103268.2A patent/CN104818978A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3664418A (en) * | 1970-03-17 | 1972-05-23 | Valery Isaakovich Graifer | Method for the development of oil fields having zonally non-uniform collector properties |
| US20130228337A1 (en) * | 2012-03-01 | 2013-09-05 | Shell Oil Company | Fluid injection in light tight oil reservoirs |
| CN102628353A (en) * | 2012-03-21 | 2012-08-08 | 中国海洋石油总公司 | Well pattern adjustment and well pattern encryption method applied to on-sea hypotonic oil deposit exploitation |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105587300B (en) * | 2015-12-31 | 2019-10-11 | 中国石油天然气股份有限公司 | Oil recovery method for horizontal well |
| CN105545272A (en) * | 2015-12-31 | 2016-05-04 | 中国石油天然气股份有限公司 | Oil extraction method for ultra-low permeability water-sensitive reservoir/compact reservoir |
| CN105587300A (en) * | 2015-12-31 | 2016-05-18 | 中国石油天然气股份有限公司 | Oil recovery method for horizontal well |
| CN105545272B (en) * | 2015-12-31 | 2018-06-01 | 中国石油天然气股份有限公司 | Oil extraction method for ultra-low permeability water-sensitive reservoir/compact reservoir |
| CN105422057A (en) * | 2015-12-31 | 2016-03-23 | 中国石油天然气股份有限公司 | Oil extraction method for ultra-low permeability oil reservoir or compact oil reservoir |
| CN105863569A (en) * | 2016-04-14 | 2016-08-17 | 中国石油大学(华东) | Single-well fracture gravity self-circulation dry-hot-rock geotherm mining method |
| CN106246150A (en) * | 2016-09-18 | 2016-12-21 | 中国石油天然气股份有限公司 | Oil field fracturing transformation method |
| CN109025940A (en) * | 2018-08-06 | 2018-12-18 | 中国石油大学(华东) | A kind of CO for compact oil reservoir2Pressure break displacement of reservoir oil integration oil production method |
| CN109025940B (en) * | 2018-08-06 | 2019-12-20 | 中国石油大学(华东) | CO for tight oil reservoir2Fracturing oil displacement integrated oil extraction method |
| CN110259421A (en) * | 2019-05-23 | 2019-09-20 | 中国石油天然气股份有限公司 | Fractured compact oil reservoir water injection energy supplementing method |
| CN110259421B (en) * | 2019-05-23 | 2021-08-31 | 中国石油天然气股份有限公司 | Fractured compact oil reservoir water injection energy supplementing method |
| CN113530499A (en) * | 2020-04-21 | 2021-10-22 | 中国石油天然气股份有限公司 | Perforating method and perforating device for shale oil-gas horizontal well with small well spacing |
| CN111948029A (en) * | 2020-09-18 | 2020-11-17 | 中南大学 | Rock mass ground stress measuring method and tensile strength uniformity measuring method |
| CN111948029B (en) * | 2020-09-18 | 2021-08-03 | 中南大学 | Rock mass ground stress measuring method and tensile strength uniformity measuring method |
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Application publication date: 20150805 |