CN103628848B - Multi-directional inter-layer water systems, and tertiary oil recovery method - Google Patents

Multi-directional inter-layer water systems, and tertiary oil recovery method Download PDF

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CN103628848B
CN103628848B CN201310629331.7A CN201310629331A CN103628848B CN 103628848 B CN103628848 B CN 103628848B CN 201310629331 A CN201310629331 A CN 201310629331A CN 103628848 B CN103628848 B CN 103628848B
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wells
oil
water
injection
reservoir
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CN103628848A (en
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闫浩
赵帆
赵一帆
李云峰
羡梦媛
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中国地质大学(武汉)
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Abstract

本发明涉及一种多方位层间注水驱替采油的方法和系统,系统包括注水井和丛式井组,丛式井组由2~20口采油井组成。 The present invention relates to a method and system for multi-directional inter-layer water flooding oil recovery system includes injection wells and cluster wells, cluster wells of production wells from 2 to 20 components. 依据油藏的分布规律,设置1~10层注水圈。 Based distribution reservoirs, water provided 1 ~ 10 layers of turns. 注水井布置在每层注水圈上,丛式井组布置在注水圈的中心或两个注水圈之间。 Injection wells arranged in each injection ring, cluster wells disposed between the two water injection rings or ring center. 每层注水圈上注水井的数量、注水圈的中心和/或两个注水圈之间丛式井组的数量根据采油区油藏分布的大小确定。 The number of turns on each water injection wells, the number of cluster wells the size of the center between the water ring and / or two rings water producing zone in accordance with the determined distribution reservoir. 根据石油勘探技术掌握油藏圈闭构造、油层分布和油层厚度,通过注水井多方位往油层注水,向丛式井组处驱油,利用丛式井组采出油层的石油。 The oil exploration art master reservoir trap structure, and distribution of oil reservoir thickness, to the water reservoir via injection wells multi-faceted, flooding the cluster wells, the use of cluster wells oil recovery reservoir. 驱油为同层位驱油,油层注水的注水量为采油量的10~30倍,通过地源热泵将注水的温度提高到60~70℃。 Flooding Flooding is the same horizon oil, reservoir water injection water is 10 to 30 times the amount of the oil, the temperature of the water increased to 60 ~ 70 ℃ by GHP. 本发明通过多个注水点向一个采油点驱油,提高了原油的采收率。 Flooding of the present invention to a plurality of oil recovery by water injection point points to improve oil recovery.

Description

多方位层间注水驱替采油方法和系统 Multi-directional inter-layer water systems, and tertiary oil recovery method

技术领域 FIELD

[0001]本发明属于石油开采技术领域,涉及一种多方位层间注水驱替采油的方法和系统。 [0001] The present invention belongs to the technical field of oil exploration, relates to a method and system for multi-directional inter-layer water of the tertiary oil recovery.

背景技术 Background technique

[0002]原油开采的初期是仅依靠天然能量开采原油,一般俗称一次采油,其采收率一般不超过15%。 Early [0002] crude oil is only rely on natural energy exploitation of crude oil, generally known as primary recovery, its recovery is generally not more than 15%. 原油开采一定阶段后,由于地层能量空间亏空,需要用注水或注气弥补采出的亏空体积。 Crude oil after a certain stage, since the space formation energy deficit, the need to make up for water injection or gas injection volume recovery shortfall. 补充地层能量而开采油田的方法称为二次采油,其采收率一般不超过50%。 Energy supplement of the oilfield formation method referred to as secondary oil recovery, which is generally not more than 50% recovery. 通过向地层注入工作剂或引入其它能量的采油方法称为三次采油,也称为EOR方法。 Agent is injected into the formation through the work or energy introduced into the oil recovery process referred to as EOR other, also called EOR method. 但是,在注水开采过程及EOR方法开采后,目前世界的先进水平为65%〜70%。 However, after waterflood and EOR process mining method, currently the world's advanced level of 65% ~ 70%. 因此,现有的开采技术造成大量的石油资源滞留地下。 Therefore, the existing mining technology resulting in a large number of stranded oil resources underground. 根据资料统计,采收率每提高1%,全国将增加石油产量1.5亿吨。 According to statistics, every 1% increase in oil recovery, the country will increase oil production 150 million tons.

[0003]公告号为CN 101956544 B的中国发明专利公开一种多底多分支井利用自流注水采油的方法,该专利为打第一口井和第二口井;在第一口井利用常规钻井技术钻注水分支,注水分支穿越水层及水层下的油层;注水分支钻后,下入割缝管沟通水层与油层;由于水层压力高,油层压力低,水层的水自动流入到油层,为油层补充能量;注水分支割缝管下入后,打水泥塞封堵分支与第一井眼结合部位;采用第二口井对油层进行采油;在第一口井利用常规钻井技术钻第一采油分支与第二采油分支,实现该第一口井的采油功能”。该专利实现一口井采油注水两种功能,节约了井槽,为后续增产措施提供了便利,但是不能实现大幅度提高采收率。 [0003] Publication No. CN 101956544 B as Chinese invention patent discloses a multi-lateral well using a multi-bottom gravity injection method of oil recovery, which patent is to play the first well and the second well; the first well with a conventional drilling technical drilling water branch water branch crossing and oil in water and aqueous layers; after injection branch drilling, down into the slotted tube communicating the aqueous layer and oil layer; due to the high aqueous layer pressure, low reservoir pressure, water in the water layer automatically flows into oil, oil of added energy; branch after injection into the slotted pipe, cementing plug plugging the first branch wellbore binding site; with a second well of the reservoir for oil; the first well drilled using conventional drilling techniques a first and a second branch oil branch oil, oil recovery implementing the functions of the first well. "this patent oil well in water to achieve two functions, saving drilling slot, provides a convenient subsequent stimulation, but can not achieve substantial enhanced oil recovery.

发明内容 SUMMARY

[0004]为了克服现有采油技术采收率低的不足,本发明提供一种多方位层间注水驱替采油的方法,提高采油生产的采收率。 [0004] In order to overcome the deficiencies of low oil recovery art, the present invention provides a multi-directional inter-layer water flooding oil recovery method EOR oil production. 本发明的另一目的是提供一种实现上述方法的多方位层间注水驱替采油的系统。 Another object of the present invention is tertiary oil recovery waterflood system layer provides multi-directional inter realizing the method.

[0005]本发明多方位层间注水驱替采油的方法,根据石油勘探技术掌握油藏圈闭构造、油层分布和油层厚度,在油藏圈内布置注水井和丛式井组,通过注水井多方位往油层注水,向丛式井组处驱油,利用丛式井组采出油层的石油。 [0005] The present invention is a multi-directional inter-layer water flooding oil recovery method, according to the master reservoir oil exploration techniques trap structure, and distribution of oil reservoir thickness, injection wells and reservoirs arrangement circle cluster wells, injection wells by the to the multi-directional water reservoir, flooding the cluster wells, the use of cluster wells oil recovery reservoir. 驱油为同层位驱油,油层间注水的注水量为采油量的10〜30倍(重量比),注水的温度为60〜70°C。 Flooding the same horizon as flooding, water injection water for oil between oil 10~30 times the amount (weight ratio), water temperature of 60~70 ° C.

[0006]本发明多方位层间注水驱替采油的系统,包括注水井和丛式井组,丛式井组由2〜20 口采油井组成。 [0006] The present invention is a multi-directional inter-layer water flooding oil recovery systems, including injection wells and cluster wells, cluster wells composition of 2~20 production wells. 依据油藏的分布规律,设置I〜10层注水圈。 Based on the distribution of the reservoir, the water level is set I~10 circle. 注水井布置在每层注水圈上,丛式井组布置在注水圈的中心和/或两个注水圈之间;每层注水圈上注水井的数量、注水圈的中心和/或两个注水圈之间丛式井组的数量根据采油区油藏分布的大小确定。 Injection wells arranged in each injection ring, cluster wells disposed in the center between the water ring and / or two injection rings; the number of turns on each layer water injection well, the center of the injection ring and / or two water number of cluster wells between turns determined according to the size distribution of the oil reservoir area.

[0007]采油井包括多分支井和采油水平井,采油水平井包括采油直井段和采油水平段,多分支井分包括垂直段和2〜6个分支段。 [0007] production well and production wells comprising a multi-branch horizontal wells, horizontal wells include oil oil oil vertical section and a horizontal section, multilateral wells include vertical segments and sub-branches 2 ~ 6 segments. 多分支井的分支段为定向斜直结构或水平结构。 Multi-lateral wells leg sections directional slant structure or a horizontal structure. 分支段位于同一油层厚度范围内或不同的油层之间。 Located between the leg sections within the same or different thickness range oil reservoir. 多分支井的分支段填充砾石,一方面防止因地质原因水平井坍塌,另一方面能保证油流的良好渗油空间。 Multilateral wells gravel packed section of a branch, on the one hand to prevent collapse due to geological reasons horizontal wells, on the other hand to ensure good oil flow space permeability. 采油水平段长度为两个注水圈之间距离的0.5〜0.8倍,每一丛式井组中的采油水平井布置在一个油层或布置在不同的油层。 Oil horizontal length of 0.5~0.8 times the distance between two injection rings, oil horizontal wells in each cluster wells are arranged in a reservoir or different reservoirs disposed. 采油水平段位于同一油层或多个油层,每个油层设有采油口。 Oil reservoir located in the same horizontal section or a plurality of reservoirs, each reservoir is provided with oil ports.

[0008] 注水井为水平注水井,水平注水井包括注水直井段和注水水平段,注水水平段设有注水点,注水点的数量根据注水水平段的长度确定。 [0008] The injection well is a horizontal injection wells, horizontal wells including injection water injection vertical section and a horizontal section, the horizontal section is provided with water injection points, number of injection points is determined according to the length of the horizontal section of injection. 水平注水井布置在油藏边缘的单个小油层或2〜5个小油层之间。 Horizontal injection wells arranged in a single small oil reservoir edges or small reservoir between 2 ~ 5. 每小油层水平注水井的总长度为油水界面周长的I〜5倍。 Each small reservoir total length horizontal injection wells is I~5 times the circumference of the oil-water interface.

[0009]本发明多方位层间注水驱替采油是在动力学模型模拟实验的基础上,得出的提高地下原油采收率的采油方法,该动力学模型是通过模拟地下原油的注水开采方法驱替采油。 [0009] The multi-directional inter-layer water displacement for oil production the invention is based on the kinetic simulation model, to improve oil recovery of underground oil recovery method derived from the dynamic model by the method simulate waterflood oil underground tertiary oil recovery. 通过模拟多方位层间注水驱替采油,以10〜30倍的水量驱替,将采收率提高到85%以上。 Mock layer by multi-directional water flooding oil to water displacement 10~30 times, the enhanced oil recovery to 85%. 在油气藏描述及掌握油藏圈闭构造、油层分布和油层厚度的基础上采用水压驱油和重力驱油。 And the master reservoir description in the oil reservoir trap structure, using hydraulic flooding and gravity drainage reservoir based on the thickness distribution and an oil. 水压驱油为多方位层间注水,由多点向同层位一点驱油。 Hydraulic flooding multi-directional inter-layer water, oil displacement by a multi-point to the same horizon. 重力驱油是利用层间的高度差,借助油的浮力作用驱油,即在油藏的单个小层或多个小层间,围绕整个油藏布置水平注水井,水平注水井在每个小层间的总长度要超出油水界面周长的I〜3倍。 Gravity drainage layer by a difference between the height of the buoyancy effect of oil flooding means, i.e. between the layers or sublayers single small reservoir, reservoirs arranged horizontally around the entire injection wells, injection wells at the level of each of the small the total length between the layer to exceed I~3 times the circumference of the oil-water interface. 视整个油藏圈闭的大小,依据油藏油井的布井规律,设I〜10层注水圈,注水圈的中间和两层注水圈之间布置采油井。 Depending on the size of the entire trap reservoir, according to well spacing for reservoirs wells, injection ring disposed I~10 layer disposed between the oil well injection water and two layers of an intermediate ring collar. 当采油井选用丛式井组时,根据丛式井组布置的地质要求,分支段的深度方向互相错开,采用星状布置,方便地控制采油区域的面积。 When the selected production wells cluster wells, geological requirements cluster wells arranged in the depth direction of the branch section offset from each other, the use of star arrangement, easily control the area of ​​the oil zone.

[0010]与现有技术相比,本发明的有益效果是通过多个注水点向一个采油点驱油,同油层驱油,根据渗透率的高低确定注水点的数量,分层注水驱替,依据层间渗透率的差异,确定不同的注水压力,按开采需求控制注水层位,提高了原油的采收率。 [0010] Compared with the prior art, the beneficial effects of the present invention is driven by a plurality of oil injection points to a point of the oil, with the reservoir flooding, the number of injection points is determined according to the level of permeability, stratified water displacement, based on permeability difference between layers, determined different injection pressure, injection mined of the demand control horizon, improved oil recovery.

附图说明 BRIEF DESCRIPTION

[0011]图1为本发明多方位层间注水驱替单层注水圈的中心采油示意图; [0011] FIG orientation layer over one single central water flooding oil recovery waterflood ring schematic diagram of the invention;

[0012]图2为本发明另一实施方案的不意图; [0012] FIG 2 according to another embodiment of the present invention is not intended embodiment;

[0013]图3为本发明再一实施方案的不意图; [0013] FIG. 3 is not intended to another embodiment of the embodiment of the present invention;

[0014]图4为丛式井组结构示意图; [0014] FIG. 4 is a schematic structural cluster wells;

[0015]图5为采油水平井布置示意图。 [0015] FIG. 5 is a horizontal oil production well disposed FIG.

[0016]其中: [0016] wherein:

[0017]丨一注水井、2 一丛式井组、3 一采油井、4 一第一层注水圈、5 一第二层注水圈、6 一第二层注水圈、7—米油直井段、8—米油水平段、9一烁石、10—油层、11一垂直段、12一分支段、13—米油水平井、14一多分支井、15—第四层注水圈、16一注水圈、17一注水直井段、18—注水水平段、19 一第五层注水圈。 [0017] Shu a water injection well, a cluster wells 2, 3 a production well, the first layer of a water ring 4, a second layer of water ring 5, a second layer of water ring 6, 7 rice oil vertical section , 8 horizontal section rice oil, a sparkle stone 9, 10 oil, a vertical section 11, a leg section 12, 13 meters water Hirai, a multi-branch well 14, the fourth layer filling ring 15, 16 a water ring, a water vertical section 17, water level section 18, fifth layer 19 a water ring.

具体实施方式 Detailed ways

[0018]下面结合附图和实施例对本发明进行详细说明。 Drawings and embodiments of the present invention will be described in detail [0018] below in conjunction.

[0019] 实施例1 [0019] Example 1

[0020]本发明多方位层间注水驱替采油的系统如图1所示,为小油藏井区,在油藏边缘布置一层注水圈16,8口注水井布置在注水圈上,I组丛式井组2布置在注水圈的中心,丛式井组由采油井3组成。 Between [0020] the present invention is a multi-layer bearing tertiary oil recovery waterflood system shown in Figure 1, a small reservoir well region disposed in one edge of the reservoir water injection wells ring 16.8 is arranged on the injection ring, the I group 2 cluster wells arranged in the center of the water ring, cluster wells composed of three production wells. 如图4所示,采油井包括I 口多分支井14和6口采油水平井13,采油水平井包括米油直井段7和米油水平段8,多分支井分为垂直段11和4个分支段12。 As shown, the extraction well including wells 4 I port 14 and the multi-branch horizontal well 13 6 oil, rice oil comprising oil horizontal well vertical section 7 and a horizontal section 8 rice oil, multi-branch well is divided into four vertical sections 11 and branch section 12. 多分支井的分支段12为定向斜直结构,分支段位于不同的油层之间。 Multilateral wells branch section 12 is inclined straight orientation structure, the branch section is located between a different reservoir. 多分支井14的分支段12填充砾石9。 Multilateral wells 14 filled with gravel branch section 12 9. 每一丛式井组中的采油水平井布置在不同的油层,每口采油水平井的采油水平段8位于同一油层10。 Each horizontal oil wells cluster wells are arranged in different oil, oil of segments per horizontal oil port 8 in the same horizontal oil well 10. 如图5所示,注水井I为水平注水井,水平注水井包括注水直井段17和注水水平段18,注水水平段设有注水点,注水点的数量根据注水水平段的长度确定。 5, I injection well is a horizontal injection wells, injection wells comprises a horizontal section 17 and vertical well injection water level section 18, the horizontal section is provided with water injection points, number of injection points is determined according to the length of the horizontal section of injection. 水平注水井布置在油藏边缘的单个小油层或2个小油层之间。 Horizontal injection wells disposed in the edge of the reservoir or 2 small single small reservoir between the reservoir. 每小油层水平注水井的总长度为油水界面周长的2倍。 Each small reservoir total length horizontal injection wells is twice the circumference of the oil-water interface.

[0021]本发明多方位层间注水驱替采油的过程为,根据石油勘探技术掌握油藏圈闭构造、油层分布和油层厚度,在通过注水井多方位往油层注水,向丛式井组处驱油,利用丛式井组采出油层的石油,同油层驱油。 [0021] The present invention is a multi-directional inter-layer water of oil displacement process, master reservoir trap structure, the distribution of oil and oil exploration technique according to the thickness of the oil layer, the oil layer to the multi-directional water through injection wells, at the cluster wells in flooding, the use of cluster wells oil recovery reservoir, with the reservoir flooding. 油层间注水的注水量为采油量的20倍(重量比),注水的温度为65°C。 Between reservoir water injection water for oil production of 20-fold (weight ratio), water temperature of 65 ° C.

[0022] 实施例2 [0022] Example 2

[0023]本发明另一实施方式如图2所示,为中小油藏,采用三层注水圈16。 [0023] Another embodiment of the present invention shown in Figure 2, is a small reservoir, water ring 16 with three layers. 在油藏的中间布置第一层注水圈4,第一层注水圈上布置8 口注水井I。 Disposed in the middle of the reservoir 8 is arranged on the first layer of water injection wells ring 4, a first layer of water ring I. 在油藏边缘布置第三层注水圈6,第三注水圈上有6 口注水井。 A third layer disposed at the edge of the reservoir water ring 6, there are six water injection wells on the third ring. 第一注水圈和第三注水圈之间布置第二层注水圈5,第二层注水圈上设有6 口注水井。 The second layer is disposed between the first water injection ring 5 and the third ring water ring 6 is provided on the second layer of water injection wells ring. 第一层注水圈的中心设有一组丛式井组2,第一层注水圈和第二层注水圈之间设有3组丛式井组,第二层注水圈与第三层注水圈之间设有5组丛式井组2。 Central injection layer is provided with a first ring cluster wells group 2, group 3 with cluster wells injection layer between the first ring and the second ring injection layer, the second layer and the third layer water injection ring laps 5 is provided between cluster wells 2 groups. 采油水平段8的长度为两个注水圈之间距离的0.6倍。 8 oil horizontal length of 0.6 times the distance between two water rings. 多方位层间注水驱替采油过程与实施例1相同。 Injection - multi-directional inter-layer same as in Example 1 for oil recovery process.

[0024] 实施例3 [0024] Example 3

[0025]本发明再一实施方式如图3所示,为大中型油藏采油区,采用五层注水圈16。 [0025] A further embodiment of the present invention shown in Figure 3, for medium and large oil reservoir zone, water ring 16 using five layers. 在油藏的中间布置第一层注水圈4,第一层注水圈上布置3 口注水井I。 Reservoir in the middle layer is disposed on the first water coil 4, the first layer of turns disposed three water injection wells I. 在第二层注水圈5布置6 口注水井,第三层注水圈6上有8 口注水井,第四层注水圈15布置12 口注水井,第五层注水圈19设有12 口注水井。 In the second ring 5 is arranged injection layer 6 injection wells, a third layer of turns on the water injection wells 68, the fourth layer filling ring 15 is arranged injection wells 12, fifth layer 19 has 12 turns water injection wells . 第一层注水圈的中心设有I组丛式井组2,第一层注水圈和第二层注水圈之间设有4组丛式井组,第二层注水圈与第三层注水圈之间设有6组丛式井组2,第三层注水圈与第四层注水圈之间设有8组丛式井组2,第四层注水圈与第五层注水圈之间设有12组丛式井组2。 Central injection layer is provided with a first ring of group I cluster wells 2, with 4 groups cluster wells injection layer between the first ring and the second ring injection layer, the second layer and the third layer water injection ring ring is provided between the two, it is provided with between 8 groups cluster wells 2, the fourth layer and the fifth layer water injection ring collar between the third layer and the fourth layer water injection ring group ring 6 cluster wells 12 group 2 cluster wells.

Claims (5)

1.一种多方位层间注水驱替采油的系统,包括注水井(I)和丛式井组(2),所述丛式井组(2)由2〜20 口采油井(3)组成,其特征是:依据油藏的分布规律,设置I〜10层注水圈(16);所述注水井(I)布置在每层注水圈上,所述丛式井组(2)布置在注水圈的中心和/或两个注水圈之间;每层注水圈上注水井的数量、注水圈的中心和/或两个注水圈之间丛式井组的数量根据采油区油藏分布的大小确定;所述水平注水井布置在油藏边缘的单个小油层(10)或2〜5个小油层之间,每小油层水平注水井的总长度为油水界面周长的I〜3倍;所述采油井包括多分支井(14)和采油水平井(13),所述采油水平井包括采油直井段(7)和采油水平段(8),所述多分支井分包括垂直段(11)和2〜6个分支段(12);根据丛式井组布置的地质要求,分支段的深度方向互相错开,采用星状布置。 A multi-layer position between the water flooding oil recovery systems, injection wells comprising (I) and cluster wells (2), said cluster wells (2) 2~20 production wells (3) Composition , wherein: based on distribution reservoirs, water ring provided I~10 layer (16); said injection wells (I) is arranged on each injection ring, said cluster wells (2) is arranged in water between the center ring and / or two injection rings; the number of turns on each layer water injection wells, the number of cluster wells of water between the center ring and / or two water reservoirs size distribution ring according producing zone determined; small reservoir between the individual injection wells arranged in the horizontal edge of the reservoir (10) or a small reservoir 2 ~ 5, the level of oil per hour total length of injection wells is I~3 times the circumference of the oil-water interface; the said oil well comprising a multiple branch wells (14) and horizontal oil well (13), said oil well comprising a horizontal oil vertical section (7) and the oil horizontal section (8), said multi-lateral wells include vertical sub-section (11) 2 ~ 6 and the branch segments (12); geological claim cluster wells arranged in the depth direction of the branch section offset from each other, the use of star arrangement.
2.根据权利要求1所述的多方位层间注水驱替采油的系统,其特征是:所述多分支井(14)的分支段(12)为定向斜直结构或水平结构,所述分支段位于同一油层厚度范围内或不同的油层之间。 The inter-layer multi-directional displacement of the injection system 1 for the oil, which is claimed in claim wherein: the multi-branch well (14) a branch section (12) is oriented obliquely straight structure or a horizontal structure, the branch section is located between the same or different thickness range oil reservoir.
3.根据权利要求1所述的多方位层间注水驱替采油的系统,其特征是:所述多分支井(14)的分支段(12)填充砾石(9)。 3. The system of water flooding oil layer between the multi-faceted claimed in claim 1, wherein: the multi-branch well (14) of the leg sections (12) filled with gravel (9).
4.根据权利要求1所述的多方位层间注水驱替采油的系统,其特征是:所述采油水平段(8)长度为两个注水圈之间距离的0.5〜0.8倍,每一丛式井组(2)中的采油水平井布置在一个油层或布置在不同的油层;采油水平段(8)位于同一油层(10)或多个油层,每个油层设有采油口。 The water flooding oil recovery system of multi-directional inter-layer according to claim 1, characterized in that: said oil horizontal section (8) a length of 0.5~0.8 times the distance between two injection rings, each cluster group oil wells arranged horizontal wells (2) in the reservoir or a reservoir arranged in different; oil horizontal section (8) located in the same reservoir (10) or a plurality of reservoirs, each reservoir is provided with oil ports.
5.根据权利要求1所述的多方位层间注水驱替采油的系统,其特征是:所述注水井(I)为水平注水井,所述水平注水井包括注水直井段(17)和注水水平段(18),所述注水水平段设有注水点,注水点的数量根据注水水平段的长度确定。 5. The system of water flooding oil layer between the multi-faceted as claimed in claim 1, characterized in that: said water injection well (I) is a horizontal injection wells, injection wells comprising the injection level vertical section (17) and water horizontal section (18), said horizontal section is provided with water injection points, number of injection points is determined according to the length of the horizontal section of injection.
CN201310629331.7A 2013-12-02 2013-12-02 Multi-directional inter-layer water systems, and tertiary oil recovery method CN103628848B (en)

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