Recovering method for improving substrate and microfracture oil flooding efficiency in dual medium reservoir gas injection

A dual medium, mining method technology, applied in the fields of fluid extraction, earthwork drilling, climate sustainability, etc., can solve problems such as production difficulties

Inactive Publication Date: 2015-11-25
PETROCHINA CO LTD
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Problems solved by technology

This method can overcome the problems such as production dif

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  • Recovering method for improving substrate and microfracture oil flooding efficiency in dual medium reservoir gas injection
  • Recovering method for improving substrate and microfracture oil flooding efficiency in dual medium reservoir gas injection
  • Recovering method for improving substrate and microfracture oil flooding efficiency in dual medium reservoir gas injection

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[0017] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

[0018] The method for improving oil displacement efficiency of matrix and micro-fractures by gas injection in dual-medium reservoirs provided by the present invention may include the following steps: designing the gas injection well and the production well in the same target reservoir, and the gas injection well and the production well form a One-to-one or one-to-many correspondence, such as figure 1 shown in figure 1 Among them, well a is a vertical production well, well d is a horizontal production well, well b is a vertical gas injection well, and well c is a horizontal gas injection well. The gas injection well and the production well can have a one-to-one correspond...

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Abstract

The invention provides a recovering method for improving the substrate and microfracture oil flooding efficiency in dual medium reservoir gas injection. The method comprises the following steps of: designing gas injection wells and production wells into the same target reservoir, wherein the gas injection wells and the production wells have one-to-one correspondence or one-to-multiple correspondence relationship; and then, injecting gas into the gas injection wells for recovery. The method has the advantages that the goal of effectively using rest oil in substrates and microfractures after the oil reservoir water flooding is achieved; the requirement of improving the oil flooding efficiency of the substrates and the microfractures is met; the single-well recoverable reserve scale is increased; the new well drilling investment cost is reduced; the existing underground resources can be well used; and the recovery utilization rate of the resources is improved.

Description

technical field [0001] The invention relates to a gas injection production method of a double-medium reservoir, in particular to a production method for improving matrix and micro-fracture oil displacement efficiency by gas injection of a double-medium reservoir. Background technique [0002] Dual-media reservoirs, also known as fractured and porous media reservoirs, refer to reservoirs with both fractures and pores in rocks. Porous media, also known as matrix, are the main storage space for crude oil, and fractures are oil flow channels. The particularity of the dual medium is that the matrix supplies liquid to the fracture, and then flows from the fracture to the bottom of the well. Since the permeability of fractures is greater than that of matrix and micro-fractures, how to improve the production degree of matrix and micro-fractures is the key to enhancing oil recovery. [0003] Artificial water injection is to inject water into the oil layer to increase its oil displac...

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Application Information

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IPC IPC(8): E21B43/00E21B43/20E21B43/26
CPCY02P90/70
Inventor 赵凡张新培司勇梁飞董凤龙高丽宋新利陈忠田梅孟丹
Owner PETROCHINA CO LTD
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