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Gas injection oil displacement method and system

An oil displacement method and gas injection technology, which are used in earth-moving drilling, production of fluids, wellbore/well components, etc., can solve problems such as excess oil remaining, expand the scope, improve the degree of oil recovery, and reduce the distribution of remaining oil. Effect

Pending Publication Date: 2021-07-23
PETROCHINA CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a gas injection flooding method and system to solve the problem that there is still a lot of residual oil after gas flooding in the prior art, which can improve the degree of oil recovery and reduce the distribution of residual oil

Method used

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  • Gas injection oil displacement method and system
  • Gas injection oil displacement method and system
  • Gas injection oil displacement method and system

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] see image 3 , the embodiment of the present invention proposes a kind of gas injection flooding method, comprises the following steps:

[0032] Step 1, setting up a gas injection well 1, a production well 2 and a plurality of control wells 3, wherein the control well 3 has the same structure as the gas injection well 1, and a plurality of control wells 3 are arranged at intervals between the gas injection well 1 and the production well 2.

[0033] Specifically, before gas injection and oil displacement in the reservoir, a control well 3 is set between the gas injection well 1 and the production well 2. The control well 3 is used to assist the gas injection well 1 to perform gas injection and oil displacement. The gas wells 1 have the same structure, and the number of control wells 3 is set to be multiple according to the actual situat...

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Abstract

The invention discloses a gas injection oil displacement method and system. The gas injection oil displacement method comprises the following steps of setting the working positions of a gas injection well, a production well and a plurality of control wells, wherein the control wells are used for assisting gas injection, and the multiple control wells are arranged between the gas injection well and the production well at intervals; setting the working well depths of the gas injection well, the production well and the plurality of control wells respectively; closing the control wells, and injecting preset gas into the gas injection well; and closing the injection well and the production well within the preset time, and injecting preset gas into the multiple control wells in sequence. The control wells and the gas injection well are the same in structure; the production well comprises an oil pipe, a casing pipe and a packer arranged between the oil pipe and the casing pipe; each of the gas injection well and the control well comprises a hole oil pipe, a casing pipe, a packer arranged between the hole oil pipe and the casing pipe, and a screwed plug arranged at the tail end of the hole oil pipe. The oil extraction degree can be improved, and remaining oil distribution is reduced.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and in particular relates to a method and system for gas injection and oil displacement. Background technique [0002] In today's world, although oil and gas recoverable reserves and production continue to increase, demand increases more strongly, oil and gas supply is difficult to support the demand for economic growth, and oil is in short supply. Gas injection flooding technology is an advantageous technology in the late stage of water injection development and low-permeability reservoir development. Gas injection technology is in the stage of large-scale promotion and application in my country's oilfields. It has the advantages of low seepage resistance, fast recovery of formation pressure, and obvious oil displacement effect. . The types of gas media are mainly concentrated in CO 2 , hydrocarbon gas, and nitrogen gas. The three types of gases have their own advantages and disadvantages,...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/30
CPCE21B43/168E21B43/30
Inventor 周代余伍藏原闫更平陈兴隆俞宏伟李实袁萍杜虹宝李君曹安张少伟赵红刘国威王倩王娜王超徐彦龙程钊彭丽邵光强范家伟范坤宇
Owner PETROCHINA CO LTD
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