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Organic acid liquid treatment method for enhancing and maintaining fracture conductivity of compact sandstone reservoir

A technology for tight sandstone reservoirs and organic acid liquids, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc. Economical cost, effect of enhancing and maintaining diversion capacity

Inactive Publication Date: 2021-05-11
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the current measures for stimulation and reconstruction of tight sandstone reservoirs, t

Method used

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  • Organic acid liquid treatment method for enhancing and maintaining fracture conductivity of compact sandstone reservoir
  • Organic acid liquid treatment method for enhancing and maintaining fracture conductivity of compact sandstone reservoir
  • Organic acid liquid treatment method for enhancing and maintaining fracture conductivity of compact sandstone reservoir

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Example

[0031]Practical case 1

[0032]In order to verify the reliability of the present invention, the experiment was carried out by a dense sandstone like, the acetic acid solution was carried out, and the etching phenomenon of the mineral components of the dense sand rock crack wall was verified, and the stress sensitivity variation characteristics of the rock sample before and after the reaction were analyzed. The specific steps are as follows:

[0033]A. Select a dense sandstone like the core test data, requiring the dense sandstone stone content>35%, long stone + carbonate mineral content>15%;

[0034]b, pretreatment of step A rock samples, Brazilian splitting method has a columnar crack rock like a diameter of 25 mm, test penetration and perform stress sensitivity analysis;

[0035]c, inject 12% mass concentration of acetic acid solution to step B, and dissolve the surface of the dense sandstone sample crack wall surface, and the carbonate mineral component is sufficiently etched to form a disso...

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Abstract

The invention provides an organic acid liquid treatment method for enhancing and maintaining the fracture conductivity of a compact sandstone reservoir. Organic acid liquid is injected into the fractured tight sandstone reservoir, feldspar and carbonate mineral components are selectively corroded on the wall surface of the fracture, stable mineral components are exposed, the concave-convex degree of the wall surface of the fracture is enhanced, and the fracture conductivity of the tight sandstone reservoir is enhanced and kept. The organic acid liquid treatment method comprises the steps that a typical fractured compact sandstone reservoir is selected; the proper acid liquor type and concentration are selected; the organic acid liquid is injected into the tight sandstone reservoir containing the artificial fractures or the natural fractures, and spontaneous imbibition or forced imbibition is carried out; and after the organic acid liquid fully reacts with the mineral components on the tight sandstone fracture surface, the organic acid liquid is flowback. The fracturing fluid can cooperate with deep-ultra-deep tight sandstone gas reservoir hydraulic fracturing transformation, the flow conductivity of tight sandstone reservoir fractures is enhanced and kept, high and stable yield of a gas well after hydraulic fracturing is assisted, the operation process is simple and convenient, and the economic cost is low.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas exploitation, and relates to an organic acid treatment method for enhancing and maintaining the fracture conductivity of tight sandstone reservoirs, which is mainly used to enhance and maintain the high seepage capacity of fractures and weaken fractured tight sandstone reservoirs. The stress sensitivity of formations can be adjusted to assist hydraulic fracturing technology to help tight sandstone gas wells with high and stable production. Background technique [0002] As a typical representative of unconventional oil and gas resources, deep-ultra-deep tight sandstone oil and gas resources are huge, and the prospect resources are abundant. However, tight sandstone reservoirs are loosely cemented. In the traditional acid fracturing technology, the earth acid solution used is highly acidic, and the framework of tight sandstone reservoirs is prone to severe dissolution, causing sand damag...

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Application Information

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IPC IPC(8): E21B43/26E21B43/267E21B43/27
CPCE21B43/26E21B43/267
Inventor 康毅力黄恒清游利军邵佳新谭启贵游翔马成林雷小文
Owner SOUTHWEST PETROLEUM UNIV
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