CN104790931A - On-sea low-permeability reservoir thin interbed injection-recovery branched well control-increased method - Google Patents

On-sea low-permeability reservoir thin interbed injection-recovery branched well control-increased method Download PDF

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CN104790931A
CN104790931A CN 201510104452 CN201510104452A CN104790931A CN 104790931 A CN104790931 A CN 104790931A CN 201510104452 CN201510104452 CN 201510104452 CN 201510104452 A CN201510104452 A CN 201510104452A CN 104790931 A CN104790931 A CN 104790931A
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oil
injection
branches
reservoir
branch
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CN 201510104452
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Chinese (zh)
Inventor
徐文江
谭先红
姜维东
赵金洲
孙福街
全裕科
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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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    • 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
    • E21B43/14Obtaining from a multiple-zone well
    • 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

Abstract

The invention relates to an on-sea low-permeability reservoir thin interbed injection-recovery branched well control-increased method. One single well is at least composed of a main borehole, oil recovery branches, water injection branches and artificial fractures, the main borehole is communicated with the water injection branches and the oil recovery branches, and the oil recovery branches penetrate through at least one oil layer to be communicated with the artificial fractures in the oil layer. By means of the method, through the artificial fractures in the oil recovery branches and the oil recovery branches, more underground oil and gas resources can be controlled, the displacement pressure gradation degree is built through the water injection branches, and the starting differential pressure is overcome so as to improve the oil recovery effect; as the cost for drilling the oil recovery branches and the water injection branches is far lesser than the cost for singly drilling one well, the operation cost for oil and gas resource control is greatly reduced, and the economical efficiency of the on-sea low-permeability reservoir development is accordingly improved. By means of the on-sea low-permeability reservoir thin interbed injection-recovery branched well control-increased method, more underground oil and gas resources can be controlled and developed through one injection-recovery branched well; the method is suitable for thin interbed low-permeability reservoirs.

Description

一种海上低渗油藏薄互层注采分枝井増控方法 An offshore low permeability reservoir thin interbed branch control method of injection and production wells zo

技术领域 FIELD

[0001] 本发明涉及一种海上低渗油藏薄互层注采分枝井增控方法。 [0001] The present invention relates to a thin, low permeability reservoir offshore branch wellbore by interbed injection control method adopted.

背景技术 Background technique

[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薄互层注采分枝井增控方法,利用一口井的采油分枝、注水分枝、人工裂缝相互配合增加地下油气控制程度。 [0005] The object of the present invention is to provide a thin, low permeability reservoir offshore branch wellbore by interbed injection control method of mining, oil recovery using a well branch, branch water, artificial fracture subterranean hydrocarbon cooperating increase the degree of control.

[0006] 本发明所述的海上低渗油藏薄互层注采分枝井增控方法,一口单井的组成至少包括主井眼、采油分枝、注水分枝和人工裂缝,主井眼与注水分枝、采油分枝连通,采油分枝穿越至少I层油层与油层中的人工裂缝相通,人工裂缝的条数和规模由注水分枝的距离和储层条件及采油强度确定,注水分枝采用合注或分层注水,由采油分枝的人工裂缝的距离和注采需要调解注水量。 [0006] Low Permeability Reservoir sea thin layer according to the present invention, the mutual injection control method adopted by branch wellbore, the composition comprising at least one single well of a main wellbore, branched oil, water and artificial fracture branched, primary wellbore and injection branch, branch oil communication, through at least I branch oil reservoir in communication with the reservoir layer of the artificial fracture, the number and size of article by the injection of artificial cracks branched from the oil and reservoir conditions, and strength determination, injection water branch or using co-injection layer injection, the oil branched from the hydraulic fracture and injection and production water injection requires mediation.

[0007] 本发明的采油分枝是直井、斜井或水平井,其数量和完井方式,根据储层条件和注采参数确定分枝数量,完井方式为套管射孔完井或砾石充填完井。 [0007] The present invention is a branched oil wells, inclined wells or horizontal wells, the number and completion method, determine the number of branches, as well completion method according to the gravel casing perforation completion or reservoir conditions and injection-production parameters pack completions.

[0008] 本发明的注水分枝是直井或斜井,注水方式是合注或分层注水。 [0008] The injection of the present invention is branched or straight inclined wells, injection or co-injection mode is stratified injection.

[0009] 本发明的人工裂缝条数和规模由储层条件和注采参数进行确定。 [0009] The number and the size of the artificial cracks article of the present invention is determined by the injection and production parameters and reservoir conditions.

[0010] 本发明在海上低渗油藏的薄互油层开发中的增加控制储量、降低成本和提高开发效果的作用是显著的。 [0010] In the thin cross-sea low permeability reservoir reserves increase control in development, reduce costs and improve the development of the effects of the present invention, the effect is significant. 利用本发明通过多条采油分枝及采油分枝上的人工裂缝不仅可以控制更多地下油气资源、而且通过注水分枝建立驱替压力递度、克服启动压差而增加采油效果。 The present invention, by using a plurality of branched oil and artificial cracks in the oil can be controlled not only more branches underground hydrocarbon resources, and establish a driving pressure delivery of water through the branch, to overcome the effects of oil starts to increase pressure. 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. 本方法利用一口井注采分枝井来实现控制和开发更多地下油气资源,适用于薄互层低渗油藏。 This method utilizes a well of Mycobacterium injection and production wells to achieve control and develop more underground hydrocarbon resources for thin interbed low permeability reservoir.

附图说明 BRIEF DESCRIPTION

[0011] 图1为本发明示意图。 [0011] FIG. 1 is a schematic of the present invention.

[0012] 其中:1主井眼、2米油分枝A、3米油分枝B、4米油分枝C、5注水分枝、21人工裂缝A、31人工裂缝B、32人工裂缝C、41人工裂缝D、42人工裂缝E、43人工裂缝F、6储层、7储层、8储层。 [0012] wherein: a primary wellbore 2 branching rice oil A, 3 rice oil branch B, 4 rice oil branched C, 5 branched water, artificial cracks 21 A, 31 B artificial fracture, artificial cracks 32 C, 41 artificial fractures D, 42 artificial fracture E, 43 artificial fracture F, 6 reservoirs, reservoirs 7, 8 reservoirs.

具体实施方式 detailed description

[0013] 本发明目的可采用如下技术方案来实现,海上低渗油藏薄互层开发注采分枝井增控方法,由主井眼1、米油分枝A2、米油分枝B3、米油分枝C4、注水分枝5和人工裂缝A21、人工裂缝B31、人工裂缝C32、人工裂缝D41、人工裂缝E42、人工裂缝F43组成,所述的主井眼中采用海上成熟的同井注采技术而使主井眼连通各采油分枝,采油分枝穿越至少I个油层并与人工裂缝相通,人工裂缝的规模视与注水分枝5的距离和储层条件及采油强度确定,注水分枝采用合注或分层注水技术并视与采油分枝的人工裂缝的距离及注采需要调解注水量。 [0013] The object of the present invention may be employed to achieve the following technical solutions, offshore development of low permeability reservoir thin interbed injection control method adopted by branch wellbore from a main wellbore, rice oil branch A2, rice oil branch B3, rice oil branched C4, 5 branched water and artificial fracture A21, B31 artificial fracture, artificial fracture C32, D41 artificial fracture, artificial fracture E42, F43 artificial cracks composition, said main wellbore offshore mature technology with the injection and production wells main branches each extraction wellbore communication, through at least the I branch oil reservoir and communicates with an artificial crack, depending on the size of the artificial cracks branching from the water and the oil reservoir conditions and determining the intensity of 5, bonding using water injection M. or from the water injection technology and, as a layered artificial fracture and branched oil injection and production and water injection requires mediation.

[0014] 本发明的采油分枝是直井、斜井或水平井,其数量和完井方式由储层条件、施工作业难度和注采参数进行确定,没有固定限制。 Oil M. [0014] The present invention is a vertical, slant or horizontal well, in an amount determined by the manner and completion reservoir conditions, and the difficulty of construction work injection and production parameters, no fixed limit.

[0015] 本发明的注水分枝是直井或斜井。 M. injection [0015] The present invention is a vertical wells or deviated wells.

[0016] 本发明的人工裂缝的条数和规模视储层条件、施工作业难度和注采参数进行确定,没有固定限制。 [0016] Article number depending on the size and reservoir conditions, and the difficulty of construction work hydraulic fracture injection production parameters were determined according to the present invention, there is no fixed limit.

[0017] 下面结合具体实施例对本发明作进一步说明,但本发明并不限于以下实施例。 [0017] The following embodiments in conjunction with specific embodiments of the present invention is further illustrated, but the present invention is not limited to the following embodiments.

[0018] 实施例1: [0018] Example 1:

[0019] 主井眼为直井垂深1300米(如图中主井眼I),采用同井注采技术,油层厚度150米,单层厚度50米(如图中储层6,储层7,储层8)。 [0019] The primary wellbore is a straight vertical wells 1300 m deep (as shown in the I primary wellbore), using the same injection and production technology well, reservoir thickness 150 m, a single-layer thickness of 50 m (FIG. 6 in the reservoir, the reservoir 7 reservoir 8). 注水分枝为主井眼延伸直井(如图中注水分枝5),井段长度200米;三条采油分枝为斜井,井段长度分别为100米、200米、300米,分别穿越油层为I层、2层、3层,井段人工裂缝分别为I条、2条、3条,人工裂缝垂直于水平方向,与主井眼平行,裂缝半长50米;实施后注水井日注水量为1000方,采油分枝日产液量800方。 Injection branch wellbore extending mainly vertical wells (FIG. 5 branches in water), a length of 200 m interval; three branches is inclined oil, interval lengths of 100 meters, 200 meters, 300 meters, respectively, through the reservoir I-layer, two layers, three layers, interval artificial fractures were article I, 2 bar, 3 bar, artificial fracture perpendicular to the horizontal direction, and the main wellbore parallel to the seam 50 and a half meters in length; the embodiment injection well days NOTE water 1000 side, oil 800 date M. fluid production side.

Claims (5)

  1. 1.一种海上低渗油藏薄互层开发注采分枝井增控方法,其特征在于:一口单井的组成至少包括主井眼、采油分枝、注水分枝和人工裂缝,主井眼与注水分枝、采油分枝连通,采油分枝穿越至少I层油层与油层中的人工裂缝相通。 1. An offshore development of low permeability reservoir thin interbed injection control method adopted by branch wellbore, wherein: the composition comprises at least a single well of a main wellbore, branched oil, water and artificial fracture M., Main Shaft eye and water branch, branch oil communication, through at least I branch oil layer and the oil reservoir in communication with the artificial cracks.
  2. 2.根据权利要求1所述的海上低渗油藏薄互层开发注采分枝井增控方法,其特征在于:所述的人工裂缝的条数和规模由注水分枝的距离和储层条件及采油强度确定。 The thin, low permeability reservoir sea according to claim 1 Interbedding control method developed by M. injection and production wells, wherein: the size and number of the injection of artificial cracks branched from the reservoir and conditions and oil strength determination.
  3. 3.根据权利要求1所述的海上低渗油藏薄互层开发注采分枝井增控方法,其特征在于:所述的注水分枝采用合注或分层注水,由采油分枝的人工裂缝的距离和注采需要调解注水量。 The thin, low permeability reservoir sea according to claim 1 Interbedding development injection control method adopted by branch wellbore, characterized in that: said water injection or branched layered together using water, oil production by the M. artificial fracture and injection and production from the water injection requires mediation.
  4. 4.根据权利要求1所述的海上低渗油藏薄互层开发注采分枝井增控方法,其特征在于:所述的采油分枝是直井、斜井或水平井,其数量和完井方式由储层条件、施工作业难度和注米参数进行确定。 The thin, low permeability reservoir sea according to claim 1 Interbedding development injection control method adopted by branch wellbore, wherein: said branch oil is a vertical, slant or horizontal well, the number and End well manner determined by the condition of the reservoir, the construction work and the difficulty of injection parameters meters.
  5. 5.根据权利要求1所述的海上低渗油藏薄互层开发注采分枝井增控方法,其特征在于:所述的注水分枝是直井或斜井。 The thin, low permeability reservoir sea according to claim 1 Interbedding development injection control method adopted by branch wellbore, wherein: said injection wells are straight or inclined branches.
CN 201510104452 2015-03-10 2015-03-10 On-sea low-permeability reservoir thin interbed injection-recovery branched well control-increased method CN104790931A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090038792A1 (en) * 2005-01-14 2009-02-12 Graham Stephen A System and method for producing fluids from a subterranean formation
US7546877B1 (en) * 2007-07-23 2009-06-16 Well Enhancement & Recovery Systems, Llc Process for hydrofracturing an underground aquifer from a water well borehole for increasing water flow production from Denver Basin aquifers
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
CN102606129A (en) * 2012-04-10 2012-07-25 中国海洋石油总公司 Method and system for thin interbed oilfield development
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
CN102913203A (en) * 2012-11-01 2013-02-06 中国海洋石油总公司 Method for developing low-permeability gas reservoir

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090038792A1 (en) * 2005-01-14 2009-02-12 Graham Stephen A System and method for producing fluids from a subterranean formation
US7546877B1 (en) * 2007-07-23 2009-06-16 Well Enhancement & Recovery Systems, Llc Process for hydrofracturing an underground aquifer from a water well borehole for increasing water flow production from Denver Basin aquifers
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
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
CN102606129A (en) * 2012-04-10 2012-07-25 中国海洋石油总公司 Method and system for thin interbed oilfield development
CN102913203A (en) * 2012-11-01 2013-02-06 中国海洋石油总公司 Method for developing low-permeability gas reservoir

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