CN105986792A - Method for increasing recovery ratio of shallow layer reservoir - Google Patents
Method for increasing recovery ratio of shallow layer reservoir Download PDFInfo
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- CN105986792A CN105986792A CN201510091467.6A CN201510091467A CN105986792A CN 105986792 A CN105986792 A CN 105986792A CN 201510091467 A CN201510091467 A CN 201510091467A CN 105986792 A CN105986792 A CN 105986792A
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Abstract
The invention relates to a method for increasing the recovery ratio of a shallow layer reservoir. According to the method, through measures such as three dimensional in-situ stress comparison and crack monitoring, an oil layer where horizontal cracks are generated through fracturing is selected, and one or more horizontal cracks are generated in the top and in the bottom of the oil layer through fracturing. By injecting water to the top of the oil layer and extracting oil from the bottom of the oil layer, uniform water-oil displacement is achieved, the water drive energy is sufficiently utilized, and the recovery ratio of the oil reservoir is increased.
Description
Technical field
The invention belongs to oil-gas field development technical field, relate to a kind of raising shallow oil reservoir recovery ratio method, be specifically related to a kind of method that shallow oil reservoir pressure break water drive improves recovery ratio.
Background technology
Fracturing is to improve the effective means of Low Permeability Oil/gas well production.The crack that fracturing produces in the earth formation may be for vertical fracture, horizontal fracture or complex fracture, and fracture pattern is mainly by buried depth and the stress state decision of reservoir.At the buried depth Shallow Reservoirs less than 1000m, pressure break is easily formed horizontal fracture.How to give full play to the production-increasing function of pressure break horizontal fracture；Particularly under conditions of water drive oil, how to be effectively increased floood conformance scope, improve oil recovery, be that shallow oil reservoir develops the major issue faced.Hole pattern scheduling theory and technical research currently, with respect to vertical fracture waterflooding extraction are more, but shallow oil reservoir horizontal fracture improves recovery ratio research is still in blank.
Summary of the invention
The technical problem to be solved is for the deficiencies in the prior art, it is provided that a kind of raising shallow oil reservoir recovery ratio method.The method is included in exploitation destination layer well spacing, and at exploitation destination layer crest water flooding, recovers the oil bottom exploitation destination layer.The method forms the feature of horizontal fracture for shallow oil reservoir pressure break, designs a kind of novel well spacing and pressure break mode, expands water injection well and involves scope, form displacement pattern uniform, efficient, improves shallow oil reservoir recovery ratio.
To this end, the invention provides a kind of raising shallow oil reservoir recovery ratio method, including well spacing, and at exploitation destination layer crest water flooding, recover the oil bottom exploitation destination layer.
The described preferred pressure break of exploitation destination layer can produce the shallow oil reservoir of horizontal fracture.
In certain embodiments of the present invention, the horizontal fracture water filling formed by perforation or pressure break at exploitation destination layer top.The horizontal fracture water filling preferably formed by pressure break at exploitation destination layer top.The horizontal fracture formed by pressure break bottom exploitation destination layer is recovered the oil.Described horizontal fracture is at least one.
According to the present invention, described well spacing includes drilling through straight well and/or horizontal well.
The inventive method also included, by methods such as the contrast of three-dimensional crustal stress, Crack Monitoring, selecting the step of the exploitation destination layer (oil reservoir) of pressure break generation horizontal fracture before well spacing.
In certain embodiments of the present invention, drill through straight well through exploitation destination layer, straight well is cemented the well, and at exploitation destination layer crest water flooding, recover the oil bottom exploitation destination layer.
In one embodiment, straight well drills oil reservoir, and in straight well, pressure break each to bottom oil reservoir and top once, respectively produces a horizontal fracture respectively；Or top perforations, bottom pressure break.Realizing crest water flooding by single-well injection-production down-hole string, recovers the oil in bottom.
In certain embodiments of the present invention, drill through straight well through exploitation destination layer, straight well is cemented the well；Drill through horizontal well corresponding to straight well, horizontal well is carried out pressure break or bore hole or perforation completion；By water injection of horizontal well, recover the oil bottom exploitation destination layer.By exploitation destination layer (oil reservoir) crest water flooding, recovering the oil, form uniform water drive oil in bottom, makes full use of Analysis of Water-drive Energy, improves oil recovery.
In one embodiment, drilling through horizontal well corresponding to straight well is the well section window sidetracking net horizontal section being positioned at exploitation destination layer top at straight well.
In another embodiment, drilling through horizontal well correspond to straight well to drill through horizontal well corresponding to straight well is to produce the exploitation destination layer top in the range of horizontal fracture around straight well to drill through water horizontal well.
In a detailed description of the invention, straight well drills oil reservoir, cements the well straight well, pressure break bottom oil reservoir, produces horizontal fracture.Being positioned at the well section window sidetracking water intaking horizontal well on exploitation destination layer top at straight well, or drill through water horizontal well in the range of generation horizontal fracture around straight well, horizontal segment is positioned at the top of exploitation destination layer (oil reservoir).Fractured horizontal well or bore hole or perforation completion.By water injection of horizontal well, recover the oil in crack, bottom.
In an embodiment of the invention, water horizontal well is respectively drilled through at the top of exploitation destination layer and bottom respectively；Top water horizontal well pressure break or bore hole or perforation completion.Bottom water horizontal well produces at least one horizontal fracture by pressure break.By top water horizontal well water filling, recovered the oil by bottom water horizontal well.It is any angle between the horizontal segment of above-mentioned two mouthfuls of water horizontal wells.
In one embodiment, respectively bore water horizontal well at exploitation destination layer top and bottom, can be any angle between the horizontal segment of horizontal well.Top water horizontal well pressure break or bore hole or perforation completion；Bottom water horizontal well pressure break one or more horizontal fracture.By top water horizontal well water filling, recovered the oil by bottom water horizontal well.
Heretofore described term " net horizontal section " refers to that the new well at a certain degree of depth window sidetracking of straight well the well section of horizontal direction, and it collectively forms water horizontal well with straight well.
In the present invention, horizontal well is carried out pressure break or bore hole or perforation completion and it is all to carry out at the horizontal segment of horizontal well by water injection of horizontal well.
The present invention is reasonable in design, technique is simple, convenient to operate, can be widely used for shallow oil reservoir exploitation；By at exploitation destination layer top/bottom part pressure break horizontal fracture, crest water flooding, forming uniform water drive oil.Recovering the oil in bottom, makes full use of Analysis of Water-drive Energy, improves oil recovery.The inventive method is mainly used in the saturating oil reservoir development of shallow low permeability, and shallow oil reservoir is at Ordos Basin, and Song-liao basin equal distribution is extensive, has a extensive future.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described.
Fig. 1 is well spacing and pressure break schematic diagram in embodiment 1；
Fig. 2 is well spacing and pressure break schematic diagram in embodiment 2；
Fig. 3 is well spacing and pressure break schematic diagram in embodiment 3；
Fig. 4 is well spacing and pressure break schematic diagram in embodiment 4；
Fig. 5 is well spacing and pressure break schematic diagram in embodiment 5；
Fig. 6 is well spacing and pressure break schematic diagram in embodiment 6；
Fig. 7 is well spacing and pressure break schematic diagram in embodiment 7；
Fig. 8 is well spacing and pressure break schematic diagram in embodiment 8；
Fig. 9 is well spacing and pressure break schematic diagram in embodiment 9；
In figure, the implication of reference is as follows: 1 straight well；2 exploitation destination layer top frac water flush joints；3 water drive oil directions；Frac water flush joint bottom 4 exploitation destination layers；5 exploitation destination layer crest water flooding layer perforation；6 sidetrack horizontal well sections；7 horizontal wells.
Detailed description of the invention
For making the present invention easier to understand, describing the present invention in detail below in conjunction with embodiment and accompanying drawing, these embodiments only play illustrative effect, it is not limited to the range of application of the present invention.
Embodiment
Embodiment 1:
By means such as the contrast of three-dimensional crustal stress, Crack Monitoring, select pressure break to produce the oil reservoir of horizontal fracture, drill through straight well through exploitation destination layer, and at exploitation destination layer crest water flooding, recover the oil bottom exploitation destination layer.
As it is shown in figure 1, straight well drills oil reservoir, in straight well, pressure break each to bottom oil reservoir and top once, respectively produces a horizontal fracture respectively.Result shows, compared with traditional well spacing and pressure break mode, uses the method to carry out well spacing and pressure break, and initial potential of oil-well improves 185%, and recovery ratio improves 5.7%.
Embodiment 2:
As in figure 2 it is shown, the well spacing of embodiment 2 and pressure break mode are same as in Example 1, except that top perforations completion.Result shows, compared with traditional well spacing and pressure break mode, uses the method to carry out well spacing and pressure break recovery ratio improves 3.8%.
Embodiment 3:
Use method choice exploitation destination layer same as in Example 1, and at exploitation destination layer crest water flooding, recover the oil bottom exploitation destination layer.
As it is shown on figure 3, straight well drills oil reservoir, pressure break bottom oil reservoir, produce horizontal fracture.Straight well window sidetracking net horizontal section, net horizontal section is positioned at oil reservoir top.Net horizontal section perforation completion.By net horizontal section water filling, recover the oil in crack, bottom.Result shows, compared with traditional well spacing and pressure break mode, uses the method to carry out well spacing and pressure break recovery ratio improves 4.2%.
Embodiment 4:
As shown in Figure 4, well spacing and the pressure break mode of embodiment 4 are same as in Example 3, except that produce new brill water horizontal well in the range of horizontal fracture at vertical well fracture, horizontal segment is positioned at oil reservoir top.Horizontal well perforation well.By water injection of horizontal well, recover the oil in crack, bottom.Result shows, compared with traditional well spacing and pressure break mode, uses the method to carry out well spacing and pressure break recovery ratio improves 5.3%.
Embodiment 5:
As it is shown in figure 5, the well spacing of embodiment 5 and pressure break mode are the same as in Example 4, except that two horizontal joints of fractured horizontal well.Result shows, compared with traditional well spacing and pressure break mode, uses the method to carry out well spacing and pressure break recovery ratio improves 6.0%.
Embodiment 6:
Use method choice exploitation destination layer same as in Example 1, as shown in Figure 6, respectively drill through water horizontal well at the top of exploitation destination layer and bottom respectively；Top water horizontal well perforation completion；Bottom water horizontal well produces two horizontal fractures by pressure break；By top water horizontal well water filling, recovered the oil by bottom water horizontal well.Angle between above-mentioned two mouthfuls of water horizontal wells is 0 °.Result shows, compared with traditional well spacing and pressure break mode, uses the method to carry out well spacing and pressure break recovery ratio improves 8.4%.
Embodiment 7:
As it is shown in fig. 7, the well spacing of embodiment 7 and pressure break mode are same as in Example 6, except that two horizontal joints of top water horizontal well pressure break.Result shows, compared with traditional well spacing and pressure break mode, uses the method to carry out well spacing and pressure break recovery ratio improves 10.0%.
Embodiment 8:
As shown in Figure 8, well spacing and the pressure break mode of embodiment 8 are same as in Example 6, except that the angle between two mouthfuls of water horizontal wells is 180 °.Result shows, compared with traditional well spacing and pressure break mode, uses the method to carry out well spacing and pressure break recovery ratio improves 8.5%.
Embodiment 9:
As it is shown in figure 9, the well spacing of embodiment 9 and pressure break mode are same as in Example 7, except that the angle between two mouthfuls of water horizontal wells is 180 °.Result shows, compared with traditional well spacing and pressure break mode, uses the method to carry out well spacing and pressure break recovery ratio improves 10.1%.
From above-described embodiment it can be seen that the inventive method is by oil-gas Layer top/bottom part pressure break horizontal fracture, top water filling, form uniform water drive oil.Recovering the oil in bottom, makes full use of Analysis of Water-drive Energy, improves oil recovery.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (10)
1. improve a shallow oil reservoir recovery ratio method, including well spacing, and at exploitation destination layer crest water flooding,
Recover the oil bottom exploitation destination layer.
Method the most according to claim 1, it is characterised in that pass through perforation at exploitation destination layer top
Or the horizontal fracture water filling that pressure break is formed；The horizontal fracture preferably formed by pressure break at exploitation destination layer top
Water filling.
Method the most according to claim 1, it is characterised in that pass through pressure break bottom exploitation destination layer
The horizontal fracture formed recovers the oil.
4. according to the method described in any one in Claim 1-3, it is characterised in that described well spacing includes
Drill through straight well and/or horizontal well.
Method the most according to claim 4, it is characterised in that drill through straight well through exploitation destination layer,
Straight well is cemented the well, and at exploitation destination layer crest water flooding, recovers the oil bottom exploitation destination layer.
Method the most according to claim 4, it is characterised in that drill through straight well through exploitation destination layer,
Straight well is cemented the well；Drill through horizontal well corresponding to straight well, horizontal well is carried out pressure break or bore hole or perforation completion；
By water injection of horizontal well, recover the oil bottom exploitation destination layer.
Method the most according to claim 6, it is characterised in that corresponding to straight well drill through horizontal well be
Straight well is positioned at the well section window sidetracking net horizontal section on exploitation destination layer top.
Method the most according to claim 6, it is characterised in that corresponding to straight well drill through horizontal well be
Produce the exploitation destination layer top in the range of horizontal fracture around straight well and drill through water horizontal well.
Method the most according to claim 4, it is characterised in that respectively exploitation destination layer top and
Bottom respectively drills through water horizontal well；Top water horizontal well pressure break or bore hole or perforation completion；Bottom water horizontal well is by pressure
Split generation at least one horizontal fracture；By top water horizontal well water filling, recovered the oil by bottom water horizontal well.
Method the most according to claim 9, it is characterised in that between the horizontal segment of two mouthfuls of water horizontal wells be
Arbitrarily angle.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109339753A (en) * | 2018-09-14 | 2019-02-15 | 山东石大油田技术服务股份有限公司 | A method of well pattern is remolded using directional sidetracking adjustment water injection well target position |
| CN110939412A (en) * | 2019-12-13 | 2020-03-31 | 延长油田股份有限公司富县采油厂 | Development method for realizing advanced water injection and early water injection by utilizing horizontal well |
| CN114293958A (en) * | 2021-12-13 | 2022-04-08 | 常州大学 | Method for efficiently developing heavy oil reservoir containing bottom water by adopting double horizontal wells |
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| US4372381A (en) * | 1981-04-10 | 1983-02-08 | Mobil Oil Corporation | Method for recovery of oil from tilted reservoirs |
| CN101289932A (en) * | 2007-04-17 | 2008-10-22 | 长江大学 | Straight-line parallel flow water injection oil extraction method |
| CN102518421A (en) * | 2011-12-23 | 2012-06-27 | 中国石油大学(北京) | Physical simulation visualization experimental device and forming method thereof |
| CN102678096A (en) * | 2012-05-08 | 2012-09-19 | 中国石油天然气股份有限公司 | Method for exploiting high-pour-point oil reservoir through hot water assisted gravity drainage |
| CN104141481A (en) * | 2013-05-06 | 2014-11-12 | 中国石油天然气股份有限公司 | Horizontal well spacing method for ultra-low permeability tight reservoir |
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2015
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Patent Citations (5)
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| US4372381A (en) * | 1981-04-10 | 1983-02-08 | Mobil Oil Corporation | Method for recovery of oil from tilted reservoirs |
| CN101289932A (en) * | 2007-04-17 | 2008-10-22 | 长江大学 | Straight-line parallel flow water injection oil extraction method |
| CN102518421A (en) * | 2011-12-23 | 2012-06-27 | 中国石油大学(北京) | Physical simulation visualization experimental device and forming method thereof |
| CN102678096A (en) * | 2012-05-08 | 2012-09-19 | 中国石油天然气股份有限公司 | Method for exploiting high-pour-point oil reservoir through hot water assisted gravity drainage |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109339753A (en) * | 2018-09-14 | 2019-02-15 | 山东石大油田技术服务股份有限公司 | A method of well pattern is remolded using directional sidetracking adjustment water injection well target position |
| CN110939412A (en) * | 2019-12-13 | 2020-03-31 | 延长油田股份有限公司富县采油厂 | Development method for realizing advanced water injection and early water injection by utilizing horizontal well |
| CN114293958A (en) * | 2021-12-13 | 2022-04-08 | 常州大学 | Method for efficiently developing heavy oil reservoir containing bottom water by adopting double horizontal wells |
| CN114293958B (en) * | 2021-12-13 | 2023-10-20 | 常州大学 | Method for efficiently developing heavy oil reservoir containing bottom water by adopting double horizontal wells |
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