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A setting sliding sleeve and a fracturing string containing it

A sliding sleeve and fracturing hole technology, applied in the field of fracturing strings, can solve problems such as complicated circulation flushing operations and complex string structures

Active Publication Date: 2020-09-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of string structure is complicated, especially after the completion of well flushing, it is necessary to drop a ball to block the well flushing channel, so the circulation flushing operation is complicated

Method used

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  • A setting sliding sleeve and a fracturing string containing it
  • A setting sliding sleeve and a fracturing string containing it
  • A setting sliding sleeve and a fracturing string containing it

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Experimental program
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Embodiment Construction

[0029] The present invention will be further described below in conjunction with accompanying drawing.

[0030] figure 1 A setting sleeve 100 according to the invention is shown. Such as figure 1 As shown, the setting sliding sleeve 100 includes an outer cylinder 3 , an inner cylinder 4 and a cyclic locking cylinder 6 . Wherein, a fracturing hole 12 and an external circulation hole 17 are configured on the wall of the outer cylinder 3 . The fracturing holes 12 and the external circulation holes 17 are arranged at intervals. Moreover, the fracturing holes 12 are located at the upper end of the outer cylinder 3, and are used for delivering fracturing fluid into the formation. And the outer circulation hole 17 is located at the lower end of the outer cylinder 3, and is used for circulating and flushing wells. The inner cylinder 4 is arranged in the inner cavity of the outer cylinder 3 and is used for sealing or opening the fracturing hole 12 . The cyclic locking cylinder 6 ...

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Abstract

The invention provides a setting sliding sleeve and a fracturing string including the same. The setting sliding sleeve comprises an outer tube, an inner tube arranged in an inner cavity of the outer tube, and a circulating locking tube arranged in the inner cavity of the outer tube and located at the lower end of the inner tube in a butt joint mode. Fracturing holes in the upper end and outer circulating holes in the lower end are constructed in the wall of the outer tube at intervals. Inner circulating holes are constructed in the wall of the circulating locking tube, and a partition plate used for blocking an inner cavity of the circulating locking tube is constructed on the lower sides of the inner circulating holes. Under an initial state, the fracturing holes are blocked through the inner tube, and the outer circulating holes communicate with the inner circulating holes; under the pressure effect, the inner tube drives the circulating locking tube to downwards move to be exposed out of the fracturing holes and enable the outer circulating holes and the inner circulating holes to be mutually blocked; and the setting sliding sleeve can achieve circulating well washing operationof the fracturing string.

Description

technical field [0001] The invention relates to the technical field of oil and gas downhole tools, in particular to a setting sliding sleeve and a fracturing pipe string containing it. Background technique [0002] Multi-stage setting sliding sleeve staged fracturing technology is a new well completion technology that has developed rapidly in the field of oil and gas well engineering technology in recent years. As an important means of unconventional oil and gas resource exploitation, it is mainly used in shale gas and low Fracturing stimulation of directional wells and horizontal wells that permeate oil production layers. [0003] Usually, before the fracturing operation, it is necessary to carry out the operation of circulating the wellbore and setting the packer. The conventional fracturing technology is to install a ball-type setting ball seat at the lower end of the fracturing string, and complete the circulation flushing operation through the through hole of the setti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B34/14
CPCE21B34/14E21B2200/04
Inventor 甘振维戚斌陈晨刘涛赵伟周怡君滕汶江崔警宇李腾飞钱江
Owner CHINA PETROLEUM & CHEM CORP
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