CN205532554U - Anti-seven and anti-four point combined encrypted well pattern structure of high water-cut oil reservoir - Google Patents
Anti-seven and anti-four point combined encrypted well pattern structure of high water-cut oil reservoir Download PDFInfo
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- CN205532554U CN205532554U CN201620223010.6U CN201620223010U CN205532554U CN 205532554 U CN205532554 U CN 205532554U CN 201620223010 U CN201620223010 U CN 201620223010U CN 205532554 U CN205532554 U CN 205532554U
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Abstract
The utility model provides a high water-cut oil reservoir anti-seven and anti-four point combined encrypted well pattern structure, which comprises a plurality of adjacent encrypted well pattern units, wherein each encrypted well pattern unit consists of a first well group and a second well group; the first well group consists of six first corner wells (3) positioned at six corners of a regular hexagon and a first central vertical well (2) positioned at the center of the regular hexagon; the second well group consists of three second corner wells (4) positioned at three corners of the regular triangle and one second central vertical well (5) positioned at the center of the triangle. The anti-seven-point and anti-four-point combined encrypted well pattern structure for the high-water-cut oil reservoir solves the contradiction that the water drive effect is poor and the recovery efficiency increasing effect is poor under the existing conventional well pattern encryption condition by arranging the first corner well and the second corner well, and has important significance for realizing the later-stage efficient development of the oil reservoir and improving the water drive effect.
Description
Technical field
This utility model relates to oil reservoir development field, particularly a kind of high water-cut reservoir anti-and anti-4 combined ciphering well pattern structures at 7.
Background technology
The oil reservoir of anti-seven spot pattern exploitation, at late high water content period, owing to Reservoir Heterogeneity and long-period water drive effect make anisotropism be further exacerbated by, oil reservoir gradually forms high bleed-through road, oil reservoir sweep efficiency is made to be deteriorated, have a strong impact on waterflooding effect, face residual recoverable reserves few simultaneously, the development contradiction that reserve-production ratio is low.The groundwork of oil reservoir development later stage improves water drive swept volume coefficient exactly and oil displacement efficiency carrys out suggestions for improvement.
Well pattern infilling technology is the Main Means oil reservoir development later stage improving recovery ratio, and current anti-seven spot pattern is typically encrypted as the inverted nine-spot pattern of nearly 1/2 former well spacing with nearThe anti-seven spot pattern of former well spacing, but both rule infilled well pattern injector producer distances are little, the most former anti-seven spot pattern central water flooding well water injection rate is big, around water injection well, flooded area is big, new producer after encryption is aqueous higher, successively decrease very fast, and the remaining oil between former anti-seven spot pattern producing well can not fully be employed, and improves recovery ratio limited extent.How under identical drilling well puts into premise, utilize rational well pattern thickening configuration mode, expand swept volume to greatest extent, at utmost improve the development degree of oil reservoir, improve Development Response of Oilfield, it is achieved the maximization of oil field ultimate recovery is the problem that solution is needed in oil field actual production badly.
Utility model content
Improve the little problem of amplitude of recovery ratio in high water-cut reservoir anti-seven spot pattern development late stage in order to solve existing well pattern infilling technology, this utility model provides a kind of high water-cut reservoir anti-and anti-4 combined ciphering well pattern structures at 7, anti-7 of this high water-cut reservoir solves with anti-4 combined ciphering well pattern structures under the conditions of the most conventional well pattern thickening by arranging the first corner well and the second corner well, waterflooding effect is poor, improve the contradiction of recovery ratio poor effect, to realizing this type of oil reservoir later stage Efficient Development, improving ecology effect is significant.
This utility model solves its technical problem and be the technical scheme is that a kind of high water-cut reservoir anti-and anti-4 combined ciphering well pattern structures at 7, including multiple adjacent infilled well pattern unit, this infilled well pattern unit is made up of first well group and second well group；This first well group is made up of with a bite the first central authorities straight well being positioned at this orthohexagonal center six mouthful of first corner well being positioned at orthohexagonal six angles；This second well group is made up of with a bite the second central authorities straight well at the center being positioned at this triangle three mouthful of second corner well at three angles being positioned at equilateral triangle；This second well group shares two mouthful of first corner well adjacent in this regular hexagon with this first well group, and second central authorities' straight well is positioned at the outside of this first well group.
Central authorities' straight well is water filling straight well, two mouthful of second corner well in one this second well group of adjacent two these infilled well pattern units shareds.
Second central authorities' straight well is by producing the water filling straight well that straight well transformation is formed.
Anti-7 the described infilled well pattern unit including more than three with anti-4 combined ciphering well pattern structures of described high water-cut reservoir.
Second central authorities' straight well and first central authorities' straight well all contain perforated interval.
First corner well contains perforated interval, and when the first corner well is positioned at positive rhythm formation, the perforated interval of the first corner well is positioned at this oil reservoir top.
First corner well contains perforated interval, and when the first corner well is positioned at anti-rhythm oil reservoir, the perforated interval of the first corner well is positioned at this oil reservoir bottom.
First corner well contains perforated interval, and when the first corner well is positioned at compound rhythm oil reservoir, the perforated interval of the first corner well is positioned at whole described oil reservoir.
In first well group, the adjacent horizontal range between two mouthful of first corner well is 300m～500m.
In first well group, the adjacent horizontal range between two mouthful of first corner well is 300m～400m.
The beneficial effects of the utility model are: anti-7 of this high water-cut reservoir solves with anti-4 combined ciphering well pattern structures under the conditions of the most conventional well pattern thickening by arranging the first corner well and the second corner well, waterflooding effect is poor, improve the contradiction of recovery ratio poor effect, to realizing this type of oil reservoir later stage Efficient Development, improving ecology effect is significant.
Accompanying drawing explanation
The Figure of description of the part constituting the application is used for providing being further appreciated by of the present utility model, and schematic description and description of the present utility model is used for explaining this utility model, is not intended that improper restriction of the present utility model.
Fig. 1 is original anti-7 well pattern schematic diagrams.
Fig. 2 is oil-water relative permeability curve.
Fig. 3 is the recovery ratio correlation curve under the conditions of different well pattern.
Fig. 4 be high water-cut reservoir anti-7 with the planar configuration relation schematic diagram of anti-4 combined ciphering well pattern structures.
Fig. 5 is the planar configuration relation schematic diagram of an infilled well pattern unit.
Reference in figure:
1, initial stage corner well；2, first central authorities' straight well；3, the first corner well；4, the second corner well；5, second central authorities' straight well.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.Describe this utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
In order to solve in high water-cut reservoir anti-seven spot pattern development late stage, after conventional well pattern thickening, aqueous height, production decline is fast, development effectiveness is poor, improve recovery ratio poor effect contradiction, can preferably excavate remaining oil between the well of anti-seven spot pattern, there is aqueous low, the big advantage of yield high rate of oil production, water drive sweep area can be effectively increased, improve effect of reservoir development.
In this well pattern pattern, with reference to Fig. 1, based on original anti-seven spot pattern, all other designs are all carried out on the basis of this anti-seven spot pattern.Wherein, 6 mouthfuls of straight wells on exploitation early stage anti-seven spot pattern line are for producing straight well (initial stage corner well 1), and a bite straight well at anti-seven spot pattern line center is water injection well, and development late stage sees Fig. 4, produce straight well tuberculosis well, encrypt many mouthfuls at original anti-seven spot pattern line midpoint and produce straight well.In original anti-seven spot pattern, i.e. increase described high water-cut reservoir anti-and anti-4 combined ciphering well pattern structures at 7, anti-7 of this high water-cut reservoir includes multiple adjacent infilled well pattern unit with anti-4 combined ciphering well pattern structures, and this infilled well pattern unit is made up of first well group and second well group；This first well group is made up of with a bite the first central authorities straight well 2 being positioned at this orthohexagonal center six mouthful of first corner well 3 being positioned at orthohexagonal six angles；This second well group is made up of with a bite the second central authorities straight well 5 at the center being positioned at this triangle three mouthful of second corner well 4 at three angles being positioned at equilateral triangle；This second well group shares two mouthful of first corner well 3 adjacent in this regular hexagon with this first well group, in i.e. Fig. 5 in this first well group right upper portion a bite the first corner well 3 and in the second well group a bite second corner well 4 of left upper portion be same well, in this first well group lower right side a bite the first corner well 3 and in the second well group a bite second corner well 4 of left lower be same well, second central authorities' straight well 5 is positioned at the outside of this first well group, second central authorities' straight well 5 is same well with a bite initial stage corner well 1 of the rightmost side in original anti-seven spot pattern, as shown in Figure 4 and Figure 5.
In the present embodiment, central authorities' straight well 2 is water filling straight well, two mouthful of second corner well 4 in one this second well group of adjacent two these infilled well pattern units shareds, second central authorities' straight well 5 is by producing the water filling straight well that straight well (initial stage corner well 1) transformation is formed in original anti-seven spot pattern.
Concrete develop enforcement as follows:
1, according to oil well production situation, water injection well water filling situation, calculate swept volume and the drainage radius of producing well of water injection well, each substratum remaining oil distribution feature is carried out fine description, utilizes material balance method to carry out water influx research, specify water logging region and water flooding degree, preferably encryption section；
As in figure 2 it is shown, early stage exists pressure reduction due to producing well (initial stage corner well 1) with water injection well (first central authorities' straight well 2), a line well forms the strong flooded area of line intermediate formation of straight line water drive, water injection well and producing well.Remaining oil is mainly distributed between producing well well.Encryption Well should be deployed in remaining oil enrichment oil reservoir between producing well well.
2, rational geological model is set up, a set of relatively thin uniform grid system is set up through screening, wherein the mesh spacing in XY direction is 25m, 6 simulation layers it are divided in longitudinal direction, every average 3.8 meters of layer thickness, oil reservoir buried depth 839m, porosity 27%, set up anti-and anti-4 combined ciphering well patterns, anti-9 infilled well patterns and anti-7 infilled well pattern geological models respectively at 7.The permeability saturation curve used in simulation process is shown in accompanying drawing 2.In model, required rock and fluid parameter are as follows:
Reset pressure/MPa:9.57
Saturation pressure/MPa:6.8
Crude oil density in stock tank/(g cm-3): 9.03
Underground viscosity of crude/(mPa s): 19.9
Formation rock coefficient of compressibility/10-6MPa-1: 5.69
Formation water viscosity/(mPa s): 0.98
Formation water salinity/(g cm-3): 0.197
Longitudinal direction/horizontal permeability: 0.2
3, utilize numerical Simulation Prediction research, optimize producing pattern.Anti-seven spot pattern waterflooding extraction is used at high water-cut reservoir, see accompanying drawing 1, after composite water cut reaches 90%, start well pattern thickening, simulation calculates 30 years, all reach closing well when 98% to water ratio in oil well, calculate recovery ratio, be optimized screening to anti-7 with anti-4 combined ciphering well patterns, anti-9 infilled well patterns and anti-three schemes of 7 infilled well patterns respectively.See accompanying drawing 3, predict the outcome and show, anti-7 the highest with anti-4 combined ciphering well pattern recovery ratios, more anti-7 infilled well patterns of combination well pattern improve recovery ratio 1.7%, more anti-9 infilled well patterns of combination well pattern improve recovery ratio 0.9%, combination more anti-7 infilled well patterns of well pattern bore the new Jing3Kou of encryption less simultaneously, and more anti-9 infilled well patterns bore the new Jing14Kou of encryption less, and drilling well investment can be greatly reduced.As can be seen here, anti-7 recovery ratios that can farthest improve the high water-cut reservoir anti-seven spot pattern exploitation later stage with anti-4 combined ciphering well patterns.
Original anti-7 producing patterns are with reference to accompanying drawing 1, in figure, solid black lines represents original anti-seven spot pattern, black filled circle represents former anti-seven spot pattern and produces straight well (i.e. initial stage corner well 1), and the empty circles of band arrow represents the water injection well (i.e. first central authorities' straight well 2) of original anti-seven spot pattern.
This combined ciphering well pattern schema reference accompanying drawing 4, in figure, solid black lines represents original anti-seven spot pattern, in figure, black dotted lines represents combined ciphering well pattern, empty circles represents the production straight well (the i.e. first corner well 3) of new encryption, black filled circle with arrow represents former anti-seven spot pattern oil well tuberculosis well (second central authorities' straight well 5) when well pattern thickening, empty circles with arrow represents the water injection well (i.e. first central authorities' straight well 2) of original anti-seven spot pattern, is also the water injection well of encrypted combination well pattern simultaneously.
In the present embodiment, initial stage corner well 1 is to produce straight well before encrypting, and transfers second central authorities' straight well 5 after encryption to, and second central authorities' straight well 5 and first central authorities' straight well 2 are water filling straight well, and the first corner well 3 is to produce straight well (i.e. producing well).Six mouthful of first corner well 3 in described first well group lays respectively at the midpoint on orthohexagonal each limit at initial stage corner well 1 place.Anti-7 the described infilled well pattern unit including more than three with anti-4 combined ciphering well pattern structures of described high water-cut reservoir.Second central authorities' straight well 5 and first central authorities' straight well 2 all contain perforated interval.First corner well 3 is containing perforated interval, and when the first corner well 3 is positioned at positive rhythm formation, the perforated interval of the first corner well 3 is positioned at this oil reservoir top.When the first corner well 3 is positioned at anti-rhythm oil reservoir, the perforated interval of the first corner well 3 is positioned at this oil reservoir bottom.When the first corner well 3 is positioned at compound rhythm oil reservoir, the perforated interval of the first corner well 3 is positioned at whole described oil reservoir.New production straight well (the i.e. first corner well 3) perforating site i.e. encrypted, should be positioned at oil reservoir top for positive rhythm reservoir, should be positioned at oil reservoir bottom for anti-rhythm reservoir, can whole perforations for compound rhythm reservoir.
Preferably, the anti-seven spot pattern after encryption is positioned at the inside of former anti-seven spot pattern, six mouthfuls of new encryptions produce straight wells and a bite original annotation well construction, be 30 ° of angles with former anti-7 producing patterns, and producing well is away from for former anti-seven spot pattern well spacingAnti-four-spot pattern after encryption is embedded in the middle of three new anti-seven spot patterns, three mouthfuls of new encryptions produce straight wells and a bite converted production well and form, and producing well is away from for former anti-seven spot pattern well spacingInjection-production ratio is 1:1, the Discharge rate producing straight well total in new anti-seven spot pattern is suitable with former anti-seven spot pattern, the water injection rate that in new anti-seven spot pattern, water injection well is total is suitable with former anti-seven spot pattern, and in new anti-four-spot pattern, the water injection rate of converted production well is the 0.2～0.3 of former anti-seven spot pattern water injection well.Anti-7 of the high water-cut reservoir that this utility model provides is applicable to the aqueous high water-cut reservoir being more than 90% with anti-4 combined ciphering well pattern structures.
This high water-cut reservoir anti-seven and anti-four combined ciphering well pattern structure actually used examples are described below, the moisture content of this high water-cut reservoir is 90.6%, core intersection is 12m, use anti-seven-spat pattern structure as shown in Figure 1, Fig. 1 includes three anti-seven spot pattern structures, one anti-seven spot pattern structure includes a bite water injection well (i.e. first central authorities' straight well 2) and six mouthfuls of productions straight well (i.e. initial stage corner well 1), seven mouthfuls of wells are water filling well groups, concrete well pattern structure includes: select 3 adjacent anti-seven spot patterns as water filling well group, wherein, produce straight well and the horizontal range produced between straight well is 400 meters, water injection well is 400m with the horizontal range of production straight well.
This oil reservoir is positive rhythm formation, anti-seven spot pattern is used to exploit, infilling adjustment is implemented after composite water cut reaches 90%, use as shown in Figure 4 anti-7 with anti-4 combine infilled well pattern structures, start newly to bore Encryption Well from January, 2014, Encryption Well is positioned at the midpoint of former anti-seven spot pattern line, it it is 200 meters with original production well horizontal range, by the end of in July, 2015, accumulate new brill Encryption Well 9 mouthfuls (the first corner well 3), 6 mouthful second of original production well tuberculosis well central authorities straight well 5, constitute at one new anti-7 and combine well patterns with anti-4, encrypt new well and penetrate out 4 substratums on oil reservoir top, combination well pattern injection-production ratio is 1:1, in new anti-four-spot pattern, the water injection rate of converted production well is the 0.25 of former anti-seven spot pattern water injection well.Before implementing, the production straight well composite water cut of former anti-seven spot pattern is 90.1%, day produces crude oil 115.3t, after infilling adjustment, the year fluid production rate of new production straight well is 6%, the production straight well composite water cut combined around well pattern after enforcement is 65%, day produces crude oil 262.5t, composite water cut declines 25.1%, and increase day by day oil 147.21t.
This utility model provides a kind of encrypted combination well pattern structure for high water-cut reservoir anti-seven spot pattern development late stage, solves under the conditions of the most conventional well pattern thickening, and waterflooding effect is poor, improve the contradiction of recovery ratio poor effect.This well pattern structure is applicable to use anti-seven spot pattern waterflooding extraction in early days, and later stage infilling adjustment is anti-7 high water-cut reservoirs developed with anti-4 combination well patterns, and to realizing this type of oil reservoir later stage Efficient Development, improving ecology effect is significant.
The above; it is only specific embodiment of the utility model, it is impossible to limit, with it, the scope that utility model is implemented, so the displacement of its equivalent assemblies; or the equivalent variations made according to this utility model scope of patent protection and modification, all should still fall within the category that this patent is contained.It addition, between technical characteristic and technical characteristic in this utility model, all can use with independent assortment between technical characteristic and technical scheme, between technical scheme and technical scheme.
Claims (10)
1. a high water-cut reservoir anti-7 and anti-4 combined ciphering well pattern structures, it is characterised in that described height contains
Anti-7 of water oil reservoir includes multiple adjacent infilled well pattern unit, this infilled well pattern with anti-4 combined ciphering well pattern structures
Unit is made up of first well group and second well group；
This first well group is by being positioned at six mouthful of first corner well (3) at orthohexagonal six angles and to be positioned at this orthohexagonal
A bite first central authorities' straight well (2) composition at center；
This second well group is by being positioned at three mouthful of second corner well (4) at three angles of equilateral triangle and being positioned in this triangle
A bite second central authorities' straight well (5) composition of the heart；
This second well group shares two mouthful of first corner well (3) adjacent in this regular hexagon, the second central authorities with this first well group
Straight well (5) is positioned at the outside of this first well group.
High water-cut reservoir the most according to claim 1 anti-7 and anti-4 combined ciphering well pattern structures, it is special
Levying and be, central authorities' straight well (2) are water filling straight well, one this second well of adjacent two these infilled well pattern units shareds
Two mouthful of second corner well (4) in group.
High water-cut reservoir the most according to claim 1 anti-7 and anti-4 combined ciphering well pattern structures, it is special
Levying and be, second central authorities' straight well (5) are by producing the water filling straight well that straight well transformation is formed.
High water-cut reservoir the most according to claim 1 anti-7 and anti-4 combined ciphering well pattern structures, it is special
Levy and be, anti-7 the described encryptions including more than three with anti-4 combined ciphering well pattern structures of described high water-cut reservoir
Element pattern.
High water-cut reservoir the most according to claim 1 anti-7 and anti-4 combined ciphering well pattern structures, it is special
Levying and be, perforated interval is all contained in second central authorities' straight well (5) and first central authorities' straight well (2).
High water-cut reservoir the most according to claim 1 anti-7 and anti-4 combined ciphering well pattern structures, it is special
Levying and be, the first corner well (3) contains perforated interval, when the first corner well (3) is positioned at positive rhythm formation, the first corner well
(3) perforated interval is positioned at this oil reservoir top.
High water-cut reservoir the most according to claim 1 anti-7 and anti-4 combined ciphering well pattern structures, it is special
Levying and be, the first corner well (3) contains perforated interval, when the first corner well (3) is positioned at anti-rhythm oil reservoir, the first corner well
(3) perforated interval is positioned at this oil reservoir bottom.
High water-cut reservoir the most according to claim 1 anti-7 and anti-4 combined ciphering well pattern structures, it is special
Levying and be, the first corner well (3) contains perforated interval, when the first corner well (3) is positioned at compound rhythm oil reservoir, first jiao
The perforated interval of well (3) is positioned at whole described oil reservoir.
High water-cut reservoir the most according to claim 1 anti-7 and anti-4 combined ciphering well pattern structures, it is special
Levying and be, in first well group, the adjacent horizontal range between two mouthful of first corner well (3) is 300m～500m.
High water-cut reservoir the most according to claim 9 anti-7 and anti-4 combined ciphering well pattern structures, it is special
Levying and be, in first well group, the adjacent horizontal range between two mouthful of first corner well (3) is 300m～400m.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114059990A (en) * | 2020-08-04 | 2022-02-18 | 中国石油天然气股份有限公司 | Injection-production linkage interactive allocation method and device for oil-water well |
| CN116181304A (en) * | 2021-11-26 | 2023-05-30 | 中国石油天然气股份有限公司 | Square and triangular area water injection well pattern conversion encryption method |
-
2016
- 2016-03-22 CN CN201620223010.6U patent/CN205532554U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114059990A (en) * | 2020-08-04 | 2022-02-18 | 中国石油天然气股份有限公司 | Injection-production linkage interactive allocation method and device for oil-water well |
| CN116181304A (en) * | 2021-11-26 | 2023-05-30 | 中国石油天然气股份有限公司 | Square and triangular area water injection well pattern conversion encryption method |
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