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
CN105089573AInactive Publication Date: 2015-11-25PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2015-11-25
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Claims

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