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Temporary plugging and fracturing process in degradable fiber clearance

A technology of degrading fiber and fracturing, which is applied in the direction of production fluid, wellbore/well parts, earthwork drilling and production, etc. It can solve the problems of expanding oil well drainage area and poor effect, so as to increase single well production and expand drainage area , the effect is obvious

Inactive Publication Date: 2014-03-05
PETROCHINA CO LTD +1
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Problems solved by technology

Through the formation of a fracture system combining main fractures and multiple branch fractures during fracturing, this process reduces seepage resistance and breaks through the shielding effect of heterogeneity, expands the drainage area of ​​oil wells, and increases the output of a single well after fracturing, solving the problem of The problem of poor effect of conventional fracturing technology for low-permeability and hard-to-recover reserves

Method used

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  • Temporary plugging and fracturing process in degradable fiber clearance

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with accompanying drawing:

[0017] The present invention optimizes the amount of degradable fiber and the construction displacement according to the properties of the reservoir, the working fluid, and the concentration of sand, and injects the construction working fluid prepared by the ground sand mixing equipment during the fracturing construction. The working fluid is composed of degradable fiber Composed of polyester fiber (1.0%-2.0%) + linear glue (0.45%) + proppant (20%-35%) and aqueous solution, the above-mentioned degradable polyester fiber is produced by Daqing Hengrun Petroleum Technology Development Co., Ltd., available in 70 Under the experimental temperature of ℃, the degradation rate reached 98% in 2 hours, and the linear adhesive viscosity was increased by 45%. At the same time, the fibers interacted with the proppant particles in the fracturing fluid to form a network structure, preventi...

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Abstract

The invention relates to a novel temporary plugging and fracturing process in a degradable fiber clearance. According to the temporary plugging and fracturing process, work liquid composed 1.0%-2.0% of degradable polyester fibers, 0.45% of linear glue and 20%-35% of propping agents is poured into a fracturing layer section, and a plurality of branch cracks are generated. The temporary plugging and fracturing process has the advantages that operability of the construction process is strong, the branch cracks are formed in a fracturing mode, the oil drainage area is expanded, fracturing yield is improved, an effective driving system can be built through a formed branch crack system and a well, cost is low, and the exploitation benefit of an oilfield is greatly improved, and the problems that permeability is low, exploitation is hard and the reserve fracturing reforestation effect is poor are solved.

Description

technical field [0001] The invention relates to an oil well fracturing process in the downhole operation technology of oil field exploration and development, in particular to a temporary plugging fracturing process in a degradable fiber fracture applied to a low-permeability oil layer to improve the output of a single well. Background technique [0002] With the extension of oil field production time, to maintain stable production, it is necessary to develop low-permeability oil fields such as peripheral oil fields and the Haita Basin, and the important technical means to develop low-permeability oil fields often use fracturing technology, but conventional fracturing technology has limitations , the pertinence is not strong, and it is difficult to achieve a significant increase in production. The main manifestations are: first, the reservoir lithology is diverse, the vertical heterogeneity is strong, and the degree of conventional fracturing is low; the second is that the th...

Claims

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Application Information

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IPC IPC(8): E21B43/267
Inventor 王贤君张宗雨韩松唐鹏飞尚立涛李存荣肖丹凤张明慧
Owner PETROCHINA CO LTD
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