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Drilling liner hanger and string type well cementing system comprising same

A technology of liner hanger and core pipe, which is applied in the direction of wellbore/well components, earthwork drilling and production, etc. It can solve the problems of high circulation pressure, prolong the time of cementing operation, reduce the efficiency of deblocking, etc., and achieve shortened time, The effect of accelerating unblocking efficiency and improving unblocking efficiency

Active Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pump-on cycle requires a higher cycle pressure. If it exceeds the starting pressure of the hydraulic mechanism, the slip-type seat-hanging mechanism will also sit and hang in advance, and if it is lower than the starting pressure of the hydraulic mechanism, it will reduce the unblocking. Efficiency, extending the time of cementing operations

Method used

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  • Drilling liner hanger and string type well cementing system comprising same
  • Drilling liner hanger and string type well cementing system comprising same
  • Drilling liner hanger and string type well cementing system comprising same

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing.

[0026] According to the first aspect of the present invention, a liner hanger 10 is provided, which is used for setting and hanging a liner or liner string on the inner wall of an oil well casing. Such as figure 1 As shown, the liner hanger 10 includes a core pipe 2 . The upstream end of the core pipe 2 can be connected and fixed with the packer through the threaded joint 1, and the downstream end can be used to connect the liner or the liner string. The core tube 2 has two axially spaced pressure transmitting holes 201 and a pressure stabilizing hole 202 . Wherein, the above-mentioned packer and liner are well known to those skilled in the art, and will not be described in detail here.

[0027] According to the present invention, the liner hanger 10 includes a mounting mechanism 3 sleeved outside the core pipe 2 . The sitting and hanging mechanism 3 is preferably a sli...

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Abstract

The invention relates to a drilling liner hanger and a string type well cementing system comprising the same, wherein the drilling liner hanger comprises a core tube having a pressure transfer hole and a pressure stabilizing hole, a pressure building mechanism and a setting mechanism arranged inside and outside the core tube, respectively, and a hydraulic mechanism. The hydraulic mechanism comprises a sliding sleeve component, and a setting chamber and a pressure stabilizing chamber that are formed between the core tube and a loop, wherein the pressure building mechanism is configured to allow a fluid in the core tube to pass through the pressure building mechanism during a non-pressure building time, so that the fluid can pass through the pressure transfer hole and the pressure stabilizing hole and enter the setting chamber and the pressure stabilizing chamber separately. The drilling liner hanger according to the invention can effectively prevent the hydraulic mechanism thereof to open and close in a quick lift-up and lowering and pump startup cycle process, so that the drilling liner hanger can be effectively prevented from being set in advance.

Description

technical field [0001] The invention belongs to the technical field of petroleum cementing, and in particular relates to a liner hanger and a string type cementing system including the same. Background technique [0002] The liner hanger can be divided into three types according to its driving mechanism: mechanical type, hydraulic type and hydro-mechanical double-acting type. Among them, the hydraulic liner hanger has been widely used. After the liner string reaches the designated position, the pressure holding ball is dropped to suppress the pressure inside the pipe string, thereby starting the hydraulic mechanism of the liner hanger to push the slip type seat. The hanging mechanism performs sitting and hanging operations. [0003] At present, after the existing hydraulic liner hanger encounters obstruction during its entry, measures such as rapid lifting and lowering of the pipe string, rotation of the pipe string, and pump circulation are usually required to remove the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/01
Inventor 张瑞阮臣良马兰荣侯乃贺李夯邵志香
Owner CHINA PETROLEUM & CHEM CORP
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