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Construction method of decompression-type fracturing channel

A construction method and pressure-reducing technology, which is applied to earth-moving drilling, production of fluids, wellbore/well components, etc., can solve the problems of long cycle, high cost, limitation of well depth and horizontal section length, etc., and achieves short cycle and cost Low, easy-to-use effects

Active Publication Date: 2019-02-15
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] If it is necessary to perform fracturing operations in deep horizontal wells, it is necessary to use coiled tubing to perforate the fracturing string to establish the first section of fracturing channels in the oil well. and horizontal section length limit

Method used

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  • Construction method of decompression-type fracturing channel
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  • Construction method of decompression-type fracturing channel

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Embodiment Construction

[0055] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following will further describe in detail the embodiments of the present invention in conjunction with the accompanying drawings.

[0056] It should be noted that the following "left" and "right" directions refer to the direction of the fracturing sliding sleeve provided by the embodiment of the present invention when operating in a horizontal well. At this time, the fracturing sliding sleeve is located at the toe end of the horizontal well (i.e. the front end). When the fracturing sleeve is applied in a vertical well, the following "left" and "right" can be understood as "up" and "down".

[0057] The embodiment of the present invention provides a pressure-reducing fracturing channel construction method, which uses a fracturing sliding sleeve to open the fracturing channel. as attached figure 1 And attached figure 2 As shown, the fracturing sleeve includes: left jo...

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Abstract

The invention discloses a construction method of a decompression-type fracturing channel and belongs to the field of oil-gas field development. According to the construction method, the fracturing channel is opened through a fracturing sliding sleeve. The construction method comprises the steps that well-logging information is obtained, and designing of a well-cementing pipe string is completed according to the well-logging information; the opening pressure of the fracturing sliding sleeve, the mounting number of first shear pins and the mounting chamber of second shear pins in the well-cementing pipe string are determined; the well-cementing pipe string is tripped into a borehole, and well-cementing operation is completed; a wellhead is pressurized, thus the first shear pins are sheared off, and after the wellhead is pressurized to preset pressure, wellbore pressure test operation is completed through the fracturing sliding sleeve; and the wellhead continues being pressurized, thus the second shear pins are sheared off, the pumping pressure of the wellhead is released till the fracturing sliding sleeve is completely opened, and thus building of the fracturing channel is completed.The construction method of the decompression-type fracturing channel is easy to operate, short in period and low in cost, the requirement for two-time wellbore pressure test can be met, and the pressure test time is not limited.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a construction method for pressure-reducing fracturing channels. Background technique [0002] In the development of oil and gas fields, in order to improve the flow environment of oil underground and increase the production of oil wells, fracturing operations are generally required. Before the fracturing operation, it is very important to establish a fracturing channel in the oil well. [0003] In the related art, when the fracturing operation is carried out, the fracturing channel is established in the oil well by perforating on the fracturing string. [0004] The inventor finds that the prior art has at least the following problems: [0005] If it is necessary to perform fracturing operations in deep horizontal wells, it is necessary to use coiled tubing to perforate the fracturing string to establish the first section of fracturing channels in the oil well. and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B34/08
CPCE21B34/08E21B43/26E21B2200/06
Inventor 李杰喻成刚桑宇付玉坤帅春岗汪于博杨云山赵昊
Owner PETROCHINA CO LTD
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