CN101289932A - Straight-line parallel flow water injection oil extraction method - Google Patents
Straight-line parallel flow water injection oil extraction method Download PDFInfo
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- CN101289932A CN101289932A CNA2007100655766A CN200710065576A CN101289932A CN 101289932 A CN101289932 A CN 101289932A CN A2007100655766 A CNA2007100655766 A CN A2007100655766A CN 200710065576 A CN200710065576 A CN 200710065576A CN 101289932 A CN101289932 A CN 101289932A
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Abstract
The invention relates to a linear parallel-flow water-injection oil excavating method, belonging to the gas field excavating method technical field. The method is characterized in that a plurality of horizontal production wells and a plurality of horizontal water-injection wells are obtained by drilling an oil layer which is suitable for injecting water and excavating with the horizontal wells; the production wells and the water-injection wells are respectively arranged at a certain interval in a row; an injecting well drainage and a production well drainage are alternately arranged and are parallel with each other; the water-injection well and the production well are either single pitshaft horizontal wells or horizontal branch wells; two branches of each horizontal branch well have certain horizontal section lengths and have opposite directions in the same vertical plane; and the horizontal section of each horizontal well is perforated from up to down and is fractured so as to generate an eyelet or a crack, the crude excavation is carried out through injecting water from the water-injection well to the oil layer. The linear parallel-flow water-injection oil excavating method is applied, the fingering phenomenon of the injected water can be improved, the utilization rate of the injected water is improved, the production of residual oil is reduced, recovery percent of the water-injection oil excavating for oil is improved, the waste of oil resource is reduced, and economic benefits for oil-field development is improved greatly.
Description
Technical field:
The present invention relates to a kind of straight-line parallel flow water injection oil extraction method, belong to exploitation of oil-gas field method design field.
Background technology:
What at present, the oil water flooding recovery adopted usually all is the radial flow exploitation method.No matter being peupendicular hole or horizontal well, for producing well, all is near the certain limit pit shaft, and fluid flows into pit shaft in seepage flow mode radially.And for water injection well, then be to be the center with the pit shaft, inject around fluid flows to radial flow fashion.It is to adopt the artificial recharge exploitation that the crude oil in China exploitation has more than 2/3rds, and all is to adopt straight well water filling straight well to recover the oil or straight well water filling horizontal well production.Artificial recharge develops oil fields and is mostly to adopt pattern water flooding, just water injection well and producing well is arranged on the whole development zone equably by certain geometry and density, as five-spot flooding pattern, 7 method flooding patterns etc.This water flooding regime comes down to oil reservoir is divided into many littler unit, and a bite water injection well is controlled one of them and influenced several mouthfuls of oil wells simultaneously, and each mouthful oil well is influenced by water injection well on several directions simultaneously, and the seepage flow form of water and oil is radial flow.
Under traditional radial flow oil reservoir development pattern, owing to potential difference gradient maximum on the beeline line between water injection well and the producing well, it is the fastest along this main stream line movement velocity to inject water in the displacement process, so that " fingering " phenomenon takes place.Again because the profit differences in viscosity, and the non-piston of water drive oil and the non-homogeneity of reservoir, this " fingering " phenomenon can be more remarkable, make that the waterflood front motion is extremely inhomogeneous, make the oil reservoir that is in the continuity distribution in the reservoir originally be cut apart scattered here and therely by " fingering " phenomenon, and the pattern water flooding mode is complicated more, and the continuity of oil reservoir is destroyed seriously more in the reservoir.Thereby between water injection well and the water injection well, between producing well and the producing well and be injected into the area that water cut surrounds and stay large-area region of bypassed oil.Oil in these regions of bypassed oil just is embedded in underground with the form of remaining oil, therefore make that the recovery ratio of oil water flooding recovery is very low, is the 30%-40% of original oil in place only usually, causes the serious waste of petroleum resources.
Summary of the invention:
In order to overcome the deficiencies in the prior art part, the object of the present invention is to provide a kind of straight-line parallel flow water injection oil extraction method, to reach the good profit contact relation of maintenance in recovery process, improve and inject water fingering phenomenon, improve and inject water use efficiency, improve the purpose of oil recovery factor and oil field development economic benefit.
The present invention realizes above-mentioned purpose by following technical solution.
(1), in being fit to, bore some mouthfuls of horizontal production well, producing well distributes by certain interval shape in a row with the oil reservoir of horizontal well water flooding recovery.
(2), parallel with horizontal production well, in oil reservoir, bore the some mouthfuls of flat water injection wells of horizontal saliva on ground, water injection well distributes by certain interval shape in a row.
(3), row of water injector and lines of producing wells are alternately distributed and are parallel to each other; Water injection well and producing well can be individual well tube horizontal wells, also can be horizontal branch wells; Two branches of horizontal branch well in same vertical plane and direction opposite, two horizontal branch of horizontal well all have certain horizontal section length, and the horizontal branch end of the adjacent two mouthfuls of water horizontal wells of same well array is positioned as close to.
(4), the horizontal segment of every saliva horizontal well is carried out up and down perforation or carries out pressure break, make its eyelet that generates vertical oil reservoir or crack.
(5), from water injection well, carry out oil extraction to oil-bearing stratum flooding.
The present invention has following beneficial effect compared with prior art:
(1) can keep good profit contact relation in the recovery process, improve and inject water fingering phenomenon, improve the water drive sweep efficiency of oil reservoir, reduce remaining oil, increase substantially oil recovery factor.
(2) improve the injection water use efficiency, reduced water injection rate, reduced later stage measure operations such as water blockoff, profile control significantly, reduced the water filling cost.
(3) simplify development mode, improved the oil field development economic benefit.
Description of drawings:
Fig. 1 is a straight-line parallel flow water injection oil extraction method--pressure break water flooding recovery structural representation.
Fig. 2 is a straight-line parallel flow water injection oil extraction method--perforation water flooding recovery structural representation.
In the drawings, 1. oil reservoir, 2. the horizontal flood well, 3. horizontal flood well branch, 4. horizontal flood well branch, 5. horizontal production well, 6. horizontal production well branch, 7. horizontal production well branch, 8. inject water, 9. crude oil, 10. waterflood front.
The specific embodiment:
Implement the present invention, bore some mouthfuls of horizontal production well (5) in being fit to the oil reservoir (1) of horizontal well water flooding recovery, these horizontal production well distribute by certain interval shape in a row; Parallel with horizontal production well, in oil reservoir, bore the some mouthfuls of flat water injection wells of horizontal saliva (2), these horizontal flood wells distribute by certain interval shape in a row; Row of water injector and lines of producing wells are alternately distributed and are parallel to each other.Water injection well and producing well can be individual well tube horizontal wells; Also can be horizontal branch well, the Multilateral Wells angle becomes 180 °, two branches (6) of level production Multilateral Wells and (7) in same vertical plane and direction opposite.Equally, two of the horizontal flood Multilateral Wells branches (3) and (4) also in same vertical plane and direction opposite.Two horizontal branch of horizontal well all have certain horizontal section length, and the horizontal branch end of two mouthfuls of adjacent water horizontal wells is positioned as close to.Array pitch between the well spacing of horizontal flood well, the well spacing of horizontal production well and row of water injector and the lines of producing wells can decide according to the concrete condition of different oil reservoirs.
The horizontal branch well net horizontal section is carried out perforation up and down perpendicular to oil reservoir; If low permeability pay then carries out pressure break, make it generate vertical fracture.During from the water injection well water filling, inject water (8) and at first will enter the stratum through preforation tunnel or crack perpendicular to oil reservoir (1), in the stratum, form a stifled waterwall perpendicular to oil reservoir, push ahead equably in the seepage flow mode of straight-line parallel flow to producing well by water injection well with the form of vertical plane then, crude oil (9) is driven producing well to both sides.Waterflood front (10) is very even.Crude oil in the oil reservoir also linearly advances to producing well under the promotion of injecting water equably, is introduced into preforation tunnel or crack, the pit shaft extraction ground of flowing through then.
Straight-line parallel flow water injection oil extraction method of the present invention, its waterflood front advances to lines of producing wells equably from the seepage flow mode of row of water injector with straight-line parallel flow, can not stay the region of bypassed oil, and sweep efficiency approaches 1, and the seepage flow mode of water and oil is straight-line parallel flow.The horizontal water injection well of a bite is a basic flooding pattern unit with corresponding a bite horizontal production well.According to the concrete condition of different oil reservoirs, under the prerequisite that keeps straight-line parallel flow, hole pattern can respective change.
Use straight-line parallel flow water injection oil extraction method of the present invention, can improve and inject water fingering phenomenon, improve and inject water use efficiency, reduce the generation of remaining oil, improve the recovery ratio of oil water flooding recovery, reduce the waste of petroleum resources, improve the economic benefit of oil field development greatly.
Claims (4)
1, a kind of straight-line parallel flow water injection oil extraction method is characterized in that:
(1), in oil reservoir, bore some mouthfuls of horizontal production well on ground, producing well distributes by certain interval shape in a row;
(2), parallel with horizontal production well, in oil reservoir, bore the some mouthfuls of flat water injection wells of horizontal saliva on ground, water injection well distributes by certain interval shape in a row;
(3), row of water injector and lines of producing wells are alternately distributed and are parallel to each other;
(4), the horizontal segment of every saliva horizontal well is carried out up and down perforation or carries out pressure break, make its eyelet that generates vertical oil reservoir or crack;
(5), from water injection well, carry out oil extraction to oil-bearing stratum flooding.
2, straight-line parallel flow water injection oil extraction method according to claim 1 is characterized in that water injection well and producing well are individual well tube horizontal wells.
3, straight-line parallel flow water injection oil extraction method according to claim 1 is characterized in that water injection well and producing well are horizontal branch wells, two branches of horizontal well in same vertical plane and direction opposite.
4, straight-line parallel flow water injection oil extraction method according to claim 3 is characterized in that two horizontal branch of horizontal well all have certain horizontal section length, and the end of the horizontal branch of the adjacent two mouthfuls of water horizontal wells of same well array is positioned as close to.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007100655766A CN101289932A (en) | 2007-04-17 | 2007-04-17 | Straight-line parallel flow water injection oil extraction method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956544A (en) * | 2009-07-21 | 2011-01-26 | 上海石油天然气有限公司 | Method for oil extraction in multi-bottom and multi-branch well by artesian injection |
| CN102364041A (en) * | 2011-10-26 | 2012-02-29 | 王胜存 | Oil extraction method for establishing oil permeable water stop sieve by filling fusheng sand in horizontal well fracture |
| RU2455471C1 (en) * | 2011-01-19 | 2012-07-10 | Владимир Анатольевич Иванов | System of solid low-productive zonary-heterogeneous oil formation development |
| CN102803649A (en) * | 2009-06-25 | 2012-11-28 | 国际壳牌研究有限公司 | Water Injection Systems And Methods |
| CN104818977A (en) * | 2015-03-10 | 2015-08-05 | 中国海洋石油总公司 | Single-well parallel crack water injection and oil extraction method of offshore low-permeability reservoir |
| CN105089573A (en) * | 2015-07-21 | 2015-11-25 | 中国石油天然气股份有限公司 | Mining method for improving oil displacement efficiency of matrix and micro-fracture by dual-medium reservoir gas injection |
| CN105971569A (en) * | 2016-05-17 | 2016-09-28 | 东北石油大学 | Indoor experiment device simulating fishbone-shaped multi-branch horizontal well |
| CN105986792A (en) * | 2015-02-28 | 2016-10-05 | 中国石油化工股份有限公司 | Method for increasing recovery ratio of shallow layer reservoir |
| CN107558985A (en) * | 2017-09-14 | 2018-01-09 | 吉林大学 | A kind of well spacing and reservoir treating method of oil shale in-situ exploitation |
| CN115306358A (en) * | 2022-08-22 | 2022-11-08 | 西安石油大学 | Efficient water drive device for low-permeability fractured reservoir water injection well |
| CN115506770A (en) * | 2022-10-17 | 2022-12-23 | 延安大学 | Geological development hyposmosis oil reservoir well pattern structure |
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2007
- 2007-04-17 CN CNA2007100655766A patent/CN101289932A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102803649A (en) * | 2009-06-25 | 2012-11-28 | 国际壳牌研究有限公司 | Water Injection Systems And Methods |
| US9234413B2 (en) | 2009-06-25 | 2016-01-12 | Shell Oil Company | Water injection systems and methods |
| CN101956544B (en) * | 2009-07-21 | 2013-01-02 | 上海石油天然气有限公司 | Method for oil extraction in multi-bottom and multi-branch well by artesian injection |
| CN101956544A (en) * | 2009-07-21 | 2011-01-26 | 上海石油天然气有限公司 | Method for oil extraction in multi-bottom and multi-branch well by artesian injection |
| RU2455471C1 (en) * | 2011-01-19 | 2012-07-10 | Владимир Анатольевич Иванов | System of solid low-productive zonary-heterogeneous oil formation development |
| CN102364041B (en) * | 2011-10-26 | 2014-03-26 | 王胜存 | Oil extraction method for establishing oil permeable water stop sieve by filling fusheng sand in horizontal well fracture |
| CN102364041A (en) * | 2011-10-26 | 2012-02-29 | 王胜存 | Oil extraction method for establishing oil permeable water stop sieve by filling fusheng sand in horizontal well fracture |
| CN105986792B (en) * | 2015-02-28 | 2020-05-15 | 中国石油化工股份有限公司 | Method for improving shallow reservoir recovery ratio |
| CN105986792A (en) * | 2015-02-28 | 2016-10-05 | 中国石油化工股份有限公司 | Method for increasing recovery ratio of shallow layer reservoir |
| CN104818977A (en) * | 2015-03-10 | 2015-08-05 | 中国海洋石油总公司 | Single-well parallel crack water injection and oil extraction method of offshore low-permeability reservoir |
| CN105089573A (en) * | 2015-07-21 | 2015-11-25 | 中国石油天然气股份有限公司 | Mining method for improving oil displacement efficiency of matrix and micro-fracture by dual-medium reservoir gas injection |
| CN105971569A (en) * | 2016-05-17 | 2016-09-28 | 东北石油大学 | Indoor experiment device simulating fishbone-shaped multi-branch horizontal well |
| CN105971569B (en) * | 2016-05-17 | 2018-08-03 | 东北石油大学 | A kind of indoor experimental apparatus of simulation herring-bone form multi-branched horizontal well |
| CN107558985B (en) * | 2017-09-14 | 2019-07-09 | 吉林大学 | A kind of well spacing and reservoir treating method of oil shale in-situ exploitation |
| CN107558985A (en) * | 2017-09-14 | 2018-01-09 | 吉林大学 | A kind of well spacing and reservoir treating method of oil shale in-situ exploitation |
| CN115306358A (en) * | 2022-08-22 | 2022-11-08 | 西安石油大学 | Efficient water drive device for low-permeability fractured reservoir water injection well |
| CN115306358B (en) * | 2022-08-22 | 2023-04-25 | 西安石油大学 | Efficient water driving device for low-permeability fractured reservoir water injection well |
| CN115506770A (en) * | 2022-10-17 | 2022-12-23 | 延安大学 | Geological development hyposmosis oil reservoir well pattern structure |
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