An acid fracturing process method for forming differential etching

A process method and differentiated technology, applied in the field of oil and gas field development engineering, can solve the problems of limited uneven distribution of acid liquid, difficulty in control and realization, etc., and achieve the effect of increasing oil and gas circulation capacity, with obvious effect and remarkable effect

Active Publication Date: 2021-01-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

This method relies on the difference in the properties of the two liquids, which is difficult to control and implement, and the degree of non-uniform distribution of the acid liquid is limited

Method used

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Embodiment Construction

[0026] The embodiments of the present invention are further described below; the following embodiments are illustrative, not limiting, and the protection scope of the present invention cannot be limited by the following embodiments.

[0027] An acid fracturing process method for forming differential etching, the steps are:

[0028] (1) Inject fracturing fluid into the formation through the wellbore of oil and gas wells to form artificial fractures in the formation; the length of the artificial fractures formed is 100m-200m, the width of artificial fractures is about 2-5mm, the temperature of artificial fractures is 70-100℃, and the injection time 10-15min, injection volume is 40-60m 3 .

[0029] In this example, the composition formula of fracturing fluid is generally 0.3-0.4% guar gum + 1% KCl + 1% drainage aid + 0.5% foaming agent + 0.1% bactericide + 0.2% pH regulator + 0.3% organic crosslinking agent, and the rest are water (calculated by mass percentage).

[0030] ⑵Inj...

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PUM

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Abstract

The invention relates to an acid fracturing technology method for forming differentiated etching. The method comprises the steps that 1, through an oil-gas well shaft, fracturing fluid is injected into a stratum to form artificial fractures in the stratum; 2, carrying fluid is injected into the artificial fractures, wherein oil-soluble resin particles which account for 5-20% of the amount of the carrying fluid are added into the carrying fluid; 3, the oil-soluble resin particles are made to be distributed in artificial fracture surfaces unevenly; 4, acid fluid is injected into the artificial fractures; 5, after acidic rock reaction is completed, the fracture surfaces form an uneven corrosion form, and the artificial fractures with the uneven corrosion form character cannot be completely closed under stratum pressure, so that a channel beneficial for oil-gas flowing is formed; 6, after acid fracturing construction is completed, with the increase in time, the oil-soluble resin particlesattached to rock surfaces are slowly degraded, and flow back to the ground along with oil-gas production. By means of the technology, an optimum uneven corrosion surface (with a best supporting effect) under the stratum pressure can be obtained, so that the flowing capability of the oil-gas in the stratum is improved furthest.

Description

technical field [0001] The invention belongs to the field of oil and gas field development engineering, and relates to oil and gas field development and exploitation production technology, in particular to an acid fracturing process method for forming differential etching. Background technique [0002] In order to form high-conductivity artificial fractures, there are many techniques or composite techniques, but among the acid fracturing techniques, using the heterogeneity of rock distribution to form differentially etched non-uniform etching channels is the most efficient method. There are many technical methods to form highly conductive fracture channels, but the process is difficult to control, so it is very important to adopt a simple and easy process. [0003] Conventional acid fracturing construction steps are as follows: fracturing fluid is injected to form artificial fractures, and the acid injection fluid is used to dissolve the non-uniform rock surface composition ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/27C09K8/68C09K8/74
CPCC09K8/605C09K8/685C09K8/74C09K8/885C09K8/905E21B43/26E21B43/267
Inventor 李沁伊向艺吴元琴卢渊陈文玲
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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