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Horizontal well drilling pressure control tool

A technology for controlling tools and horizontal drilling, which is applied in the direction of earthwork drilling, wellbore/well components, etc., and can solve the problems of unmeasurable pressure and difficult ground operations

Inactive Publication Date: 2015-05-06
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of unmeasurable pressure and difficult ground operation, the present invention provides a horizontal weight-on-bit control tool, which can provide stable, continuous, adjustable and adjustable weight-on-bit

Method used

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  • Horizontal well drilling pressure control tool

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Experimental program
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Effect test

Embodiment 1

[0022] In order to overcome the problems of immeasurable pressure and difficult ground operation, the present invention provides a horizontal weight-on-bit control tool, which can provide stable, continuous, adjustable and adjustable weight-on-bit. When the mandrel and the lower joint are pushed to move axially along the tool, the limit mechanism in the tool limits the distance that the mandrel can move along its axial direction, thus providing the lower joint with a stable and continuous movement distance controlled by the lower joint along its axial direction. drill pressure.

[0023] Such as figure 1 The horizontal drilling pressure control tool shown includes an upper joint 1, the upper joint 1 is fixedly connected with an outer cylinder 2, and the other end of the outer cylinder 2 is fixedly connected with a cover 4;

[0024] The inside of the upper joint 1 is provided with a mandrel 3, one end of the mandrel 3 extends out of the cover 4 and is fixedly connected with the...

Embodiment 2

[0034] On the basis of Embodiment 1, the cross-sections of the outer surface of the mandrel 3 and the inner surface of the upper joint 1 in this embodiment are regular hexagons and can slide mutually.

[0035] The cross-sections of the inner surface of the cover 4 and the outer surface of the mandrel 3 are regular hexagons, and can slide mutually.

[0036] A sealing ring 9 is provided on the inner surface of the upper joint 1 .

[0037] A spring 15 is disposed between the lower end surface 11 of the limiting convex plate 10 and the first end surface 12 of the cover 4 .

[0038] The upper joint 1 is set outside the mandrel 3. The inner surface of the upper joint 1 matches the outer surface of the mandrel 3 in size. There is a sealing ring 9;

[0039] The cover 4 is set outside the mandrel 3, the inner surface of the cover 4 matches the outer surface of the mandrel 3 in size, and the cross section is a regular hexagon, which can slide with each other and can also carry and tra...

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Abstract

The invention provides a horizontal well drilling pressure control tool. The horizontal well drilling pressure control tool comprises an upper joint, wherein the upper joint is fixedly connected with an outer tube, and a blocking cover is fixedly connected with the other end of the outer tube; a core shaft is arranged inside the upper joint, one end of the core shaft extends out of the blocking cover and is fixedly connected with a lower joint which is located at the lower end of the blocking cover, and the external surface of the core shaft is in sealed contact with the internal surface of the upper joint and the internal surface of the blocking cover; a step formed on the outer tube is in sealed contact with a limiting convex plate on the core shaft, a cavity formed among the limiting convex plate, the step and the upper joint is a liquid inlet cavity, a spring is fixedly connected onto a first end face of the blocking cover, and the other end of the spring is connected onto the lower end face of the limiting convex plate. When the core shaft and the lower joint are pushed to move along the axial direction of the tool, the limiting convex plate in the tool limits the distance of moving of the core shaft along the axial direction of the tool, so that stable and continuous drilling pressure, which is controlled by the distance of moving of the lower joint along the axial direction of the tool, is provided for the lower joint.

Description

technical field [0001] The patent of the present invention relates to the field of horizontal well workover, in particular to a horizontal drilling pressure control tool. Background technique [0002] At present, there is no special downhole tool for WOB control in drilling and milling operations of horizontal wells. The traditional way of applying WOB obviously has the disadvantages of unknown and measurable WOB, and it is difficult to operate accurately on the ground. In horizontal well drilling and milling technology, the application of axial WOB of horizontal wellbore is a difficult problem. At present, the application of axial WOB of horizontal wellbore mainly depends on the weight of the upper drilling tool. This traditional way of applying WOB has obvious disadvantages: [0003] First, the size of the pressure cannot be measured. Due to the existence of the horizontal wellbore, in the process of converting the WOB applied vertically on the ground into the horizontal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/00
CPCE21B29/00
Inventor 徐迎新席仲琛周真谢涛韩静静陈万林柳志勇高红平
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO