CN104818977A - Single-well parallel crack water injection and oil extraction method of offshore low-permeability reservoir - Google Patents

Single-well parallel crack water injection and oil extraction method of offshore low-permeability reservoir Download PDF

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Publication number
CN104818977A
CN104818977A CN201510103213.1A CN201510103213A CN104818977A CN 104818977 A CN104818977 A CN 104818977A CN 201510103213 A CN201510103213 A CN 201510103213A CN 104818977 A CN104818977 A CN 104818977A
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China
Prior art keywords
oil
water
water injection
branches
oil extraction
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CN201510103213.1A
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Chinese (zh)
Inventor
徐文江
阎洪涛
姜维东
赵金洲
李炎波
王建丰
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中国海洋石油总公司
中海石油(中国)有限公司
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Priority to CN201510103213.1A priority Critical patent/CN104818977A/en
Publication of CN104818977A publication Critical patent/CN104818977A/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/20Displacing by water
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30Specific pattern of wells, e.g. optimizing the spacing of wells

Abstract

The invention relates to a single-well parallel crack water injection and oil extraction method of an offshore low-permeability reservoir. A single well at least consists of a main well hole, and two oil extraction branches, a water injection branch and a set of parallel manual cracks positioned in a reservoir, wherein the oil extraction branches and the water injection branch are horizontal wells, and extend along a maximum main stress direction of a stratum; the water injection branch is positioned between the two oil extraction branches; the water injection branch and the oil extraction branches are subjected to the staged fracturing operation to generate the manual cracks parallel to shafts; the water injection operation is performed by the water injection branch positioned between the two oil extraction branches; and injected water diffuses along crack surfaces and enters the stratum after entering the manual cracks. The method has prominent effects on increment of the controlled reserve, reduction of the cost and improvement of the development effect in the development of the offshore low-permeability reservoir.

Description

一种海上低渗油藏单井平行裂缝注水采油方法 A marine Single Well parallel fractures in low permeability reservoir injection recovery methods

技术领域 FIELD

[0001] 本发明涉及一种海上低渗油藏单井平行裂缝注水采油方法。 [0001] The present invention relates to a single well parallel fractures in low permeability reservoir sea water recovery methods.

技术背景 technical background

[0002] 由于海上油气田处于海洋环境,生产设施和生产用井需要集中于海上生产平台或井口平台上,由于平台建造和钻完投资巨大等条件限制,海上油气田只能采用数量有限的井来实现开发,其采出程度、采油速度和经济性受到一定限制。 [0002] As the offshore oil and gas fields in the marine environment, production facilities and production wells need to focus on offshore production platform or wellhead platform, due to the platform construction and drilled a huge investment and other conditions, offshore oil and gas fields can only use a limited number of wells to achieve development, the extent of its recovery, oil recovery rate and the economy is limited.

[0003] 在开发海上低渗透油藏时,由于储层渗透性较差,油气在地下流动更为困难,一口井控制范围内的可开发的油气资源更少,由于海上采油设施和钻完井作业投资限制而无法利用陆上低渗油田多钻生产井和注水井的方法来有效开发海上低渗油藏。 [0003] In the development of low permeability reservoirs at sea, because of poor permeability reservoirs, oil and gas flow in the ground is more difficult, less oil and gas resources can be developed within a well control range, due to the drilling and completion of offshore oil installations and job investment restrictions and can not be used more than onshore drilling production wells in low permeability oil field water injection wells and methods to effectively develop offshore in low permeability reservoir.

[0004] 因此,发明海上低渗油藏利用一口井来控制和开发更多地下油气资源的方法显得更为迫切。 [0004] Thus, the method of the invention utilizing a well offshore in low permeability reservoir to control and develop more underground oil and gas resources is more urgent.

发明内容 SUMMARY

[0005] 本发明的目的在于提供一种海上低渗油藏单井平行裂缝注水采油方法。 [0005] The object of the present invention is to provide a single well parallel fractures in low permeability reservoir sea water recovery methods. 利用一口井的两条采油分枝、一条注水分枝和相互平行的人工裂缝组形成注采关系、增加地下油气控制程度的注水采油方法。 Two branch oil using a well, a group of injection branches and artificial cracks parallel to each other forming water injection and production relation recovery methods, increasing the degree of control of subterranean hydrocarbon.

[0006] 本发明所述的海上低渗油藏单井平行裂缝注水采油方法采用如下技术方案来实现:一口单井由至少包括主井眼和处于储层中的两条采油分枝、一条注水分枝和一组相互平行的人工裂缝组成,所述的采油分枝和注水分枝均为水平井并沿地层最大主应力方向延伸,注水分枝位于两条米油分枝之间,对注水分枝和米油分枝实施分段压裂作业使注水分枝和采油分枝上产生与井筒平行的人工裂缝;通过位于两条采油分枝之间的注水分枝实施注水作业,注入水进入人工裂缝后沿裂缝面扩散并进入地层,地层的油被驱替通过注水分枝两侧的采油分枝上的人工裂缝进入两侧的采油分枝。 [0006] Low Permeability Reservoir sea single well according to the present invention, parallel fractures injection recovery methods to achieve the following technical solution: a single well comprising a primary wellbore and at least two branch oil reservoir, an injection water and a set of branches parallel to each other consisting of artificial fractures, said branch oil and water wells is horizontal branches and extends along the direction of maximum principal stress in the formation, water located between the two branches branching rice oil, water for injection M. embodiment branches and rice oil staged fracturing operations in parallel so that the wellbore to generate artificial cracks in the water and oil M. M.; waterflood operations by injection of Mycobacterium positioned between two branches of the oil, the water is injected into the created fracture after diffusion along the fracture face and into the formation, the formation is oil displacement hydraulic fracture branches on both sides of the oil into the oil recovery by water injection branch branches on both sides.

[0007] 本发明的注水分枝的注水方式是合注或分注。 [0007] The water injection branches of the invention is combined injection or divided injection.

[0008] 本发明在海上低渗油藏开发中增加控制储量、降低成本和提高开发效果的作用是显著的。 [0008] The present invention adds a control Permeability Reservoir reserves offshore, the effect of reducing costs and improving the development of the effect is significant. 本发明通过位于两条采油分枝之间的注水分枝实施注水作业,注入水进入人工裂缝后沿裂缝面扩散并进入地层,由于注水面积增大不仅可以降低注水压力,还会大幅增加注入水的波及面积。 Embodiment of the present invention by water injection applications lies between two branches of the branched oil, injection water diffusion into the created fracture and into the formation along the fracture surface area is increased since the water can not only reduce the injection pressure, the injected water will be increased significantly the affected area. 处于注水分枝两侧的采油分枝由于其具有与注水分枝人工裂缝断面相平行的裂缝面,不仅增大了采油分枝的泄油面积,还会受益于注水断面建立起来的驱替压力递度影响,从而克服启动压差而增加采油效果。 M. both oil in water due to its branched sectional fracture surface of the water hydraulic fracture parallel branches, the branches not only increases the oil drainage area, will benefit from the injection section built up displacement pressure delivery of influence to overcome the pressure starts to increase oil recovery effect. 由于钻采油分枝和注水分枝成本远少于单独钻一口井的成本,会大幅降低油气资源控制的作业成本,从而提高海上低渗油藏开发的经济性。 Since oil drilling and water injection branch branches alone cost far less than the cost to drill a well, it will significantly reduce the operating costs of oil and gas resource control, thereby enhancing the economics of offshore reservoir development of low permeability.

附图说明 BRIEF DESCRIPTION

[0009] 图1为本发明示意图。 [0009] FIG. 1 is a schematic of the present invention.

[0010] 其中:1主井眼、2储层、3采油分枝A、4采油分枝B、5注水分枝、31工裂缝A31、41工裂缝B、51工裂缝C。 [0010] wherein: a primary wellbore, the reservoir 2, 3 branched oil A, 4 oil branch B, 5 branched water, 31 workers working crack crack A31,41 B, 51 workers crack C.

具体实施方式 Detailed ways

[0011] 本发明目的可采用如下技术方案来实现,海上低渗油藏开发单井平行裂缝注水采油方法,至少包括主井眼I和处于储层2中的两条采油分枝A3和采油分枝B4、一条注水分枝5和一组相互平行的人工裂缝A31、工裂缝B41、工裂缝C51组成,所述的两条采油分枝和注水分枝均为水平井并沿地层最大主应力方向延伸,注水分枝位于两条采油分枝之间,注水分枝和采油分枝实施分段压裂作业产生人工裂缝。 [0011] The object of the present invention may be employed to achieve the following technical solutions, sea Permeability Reservoir Single Well injection recovery methods parallel fractures, comprising at least a main wellbore and I 2 in the two oil reservoirs and oil sub-branches A3 branches B4, a group of injection branches 5 and a parallel artificial fractures A31, B41 of working cracks, cracks C51 working composition, the two branch oil and water wells and horizontal branches are maximum principal stress in the formation direction extending, positioned between two branch water branched oil, water and oil M. M. embodiment staged fracturing operations generate artificial cracks.

[0012] 本发明的采油分枝和注水分枝的长度及其相互之间的距离根据开采量和储层规模而定。 [0012] The distance between the oil and water branches present invention and another branch length depends on the size of the reservoir and exploitation.

[0013] 本发明的两条采油分枝和注水分枝的分段压裂级数和裂缝规模根据水平段长度300-500米,设2-3级压裂级数,裂缝半长50-100米。 [0013] Oil two branches of the invention and staged fracturing and fracture stages according to the size of the horizontal branch injection length 300-500 meters, provided 2-3 fracturing stages, fracture half-length 50-100 Meter.

[0014] 本发明的注水分枝的注水方式为合注或分注。 [0014] The present invention branched water injection way dispensing or injection together.

Claims (1)

1.一种海上低渗油藏开发单井平行裂缝注水采油方法,其特征在于:一口单井由至少包括主井眼和处于储层中的两条采油分枝、一条注水分枝和一组相互平行的人工裂缝组成,所述的采油分枝和注水分枝均为水平井并沿地层最大主应力方向延伸,注水分枝位于两条米油分枝之间,对注水分枝和米油分枝实施分段压裂作业使注水分枝和米油分枝上产生与井筒平行的人工裂缝;通过位于两条采油分枝之间的注水分枝实施注水作业,注入水进入人工裂缝后沿裂缝面扩散并进入地层,地层的油被驱替通过注水分枝两侧的采油分枝上的人工裂缝进入两侧的采油分枝。 1. A marine Permeability Reservoir Single Well injection recovery methods parallel fractures, comprising: a single well from the main wellbore and comprises at least two branch oil reservoir, a water and a set of branch the composition of the artificial cracks parallel, and the branches of the oil well and water injection is horizontal branch extending direction of maximum principal stress formation, positioned between the two branch water branched rice oil, rice oil to water and M. M. generating segment embodiment fracturing the wellbore so that the artificial cracks parallel to the water and rice oil M. M.; waterflood operations by the water located between the two branches of the branched oil, injecting water into the artificial cracks spread along the fracture plane and into the formation, the formation is oil displacement hydraulic fracture branches on both sides of the oil into the oil recovery by water injection branch branches on both sides.
CN201510103213.1A 2015-03-10 2015-03-10 Single-well parallel crack water injection and oil extraction method of offshore low-permeability reservoir CN104818977A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101289932A (en) * 2007-04-17 2008-10-22 长江大学 Straight-line parallel flow water injection oil extraction method
US20090283263A1 (en) * 2008-05-13 2009-11-19 Baker Hughes Incorporated Systems, methods and apparatuses for monitoring and recovery of petroleum from earth formations
CN101806207A (en) * 2010-04-26 2010-08-18 徐萍 Horizontal well three-dimensional intersection well pattern structure
CN101855421A (en) * 2007-07-06 2010-10-06 哈利伯顿能源服务公司 Heated fluid injection using multilateral wells
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101289932A (en) * 2007-04-17 2008-10-22 长江大学 Straight-line parallel flow water injection oil extraction method
CN101855421A (en) * 2007-07-06 2010-10-06 哈利伯顿能源服务公司 Heated fluid injection using multilateral wells
US20090283263A1 (en) * 2008-05-13 2009-11-19 Baker Hughes Incorporated Systems, methods and apparatuses for monitoring and recovery of petroleum from earth formations
CN101806207A (en) * 2010-04-26 2010-08-18 徐萍 Horizontal well three-dimensional intersection well pattern structure
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

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