Variable diameter type drift size gauge tool

A well gauge and variable diameter technology, which is applied in wellbore/well components, earthwork drilling and production, etc., can solve the problems that the well gauge cannot be lowered, and the well operation cannot be carried out.

Active Publication Date: 2018-07-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The drilling gauges provided by the prior art are suitable for drilling operation wells, but for operating wells with a small inner diameter of the wellhead Christmas tree and a relatively large inner diameter of the tubing in the wellbore (the drilling has the characteristics of small upper part and larger bottom part) , in order to realize the well drilling function, the size of the cylindrical body of the well drilling gauge is determined according to the inner diameter of the tubing, which causes the well drilling gauge to be unable to be lowered from the wellhead Christmas tree, resulting in the impossibility of well drilling operations

Method used

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  • Variable diameter type drift size gauge tool
  • Variable diameter type drift size gauge tool

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specific Embodiment approach

[0053] As an implementation, as attached figure 1As shown, the cylindrical body 2 includes an outer sleeve 201, a variable diameter shaft 202, a spring 203, and a plurality of sliders 204, wherein the two ends of the outer sleeve 201 are connected to the upper joint 1 and the guide head 3 respectively. sleeve 201, and the wall of the outer sleeve 201 is evenly provided with a plurality of longitudinal through grooves 2011 of predetermined length along the circumferential direction (see the attached figure 2 ). The reducing shaft 202 is fixedly sleeved inside the outer sleeve 201, and the reducing shaft 202 includes a large-diameter section and a small-diameter section connected sequentially from top to bottom. The spring 203 is sleeved on the small-diameter section of the reduced-diameter shaft 202 , and the lower end of the spring 203 abuts against the upper end of the guide head 3 . The slide block 204 includes a slide rail part and a well part connected in sequence, the ...

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PUM

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Abstract

The invention discloses a variable diameter type drift size gauge tool, and belongs to the field of oil and gas well equipment. The drift size gauge tool comprises an upper connector and a cylindricalbody, wherein the upper end of the cylindrical body is connected with the lower end of the upper connector, and the external diameter of the cylindrical body is variable. When the cylindrical body isunder downward pressure, the outer diameter decreases; and when the cylindrical body is free from pressure, the outer diameter of the cylindrical body remains constant. The variable diameter type drift size gauge tool is applicable not only to an operating well with the inner diameter of a wellhead Christmas tree smaller than the inner diameter of an oil pipe in a wellbore, but also to a common full-bore diameter type operating well in the field.

Description

technical field [0001] The invention relates to the field of oil and gas well equipment, in particular to a variable diameter well gauge. Background technique [0002] With the long-term exploitation of the oil well, the inner wall of the downhole casing will be deformed, and the problem of diameter shrinkage will occur, which will hinder the subsequent entry of oil recovery workover tools and production tools, and affect the normal production of the oil well. Moreover, tools in the wellbore will also have various failures, which requires measures such as workover. At this time, the wellbore needs to be drilled first to clean up impurities such as oil, burrs, wax deposits, and scaling on the inner wall of the casing, so as to facilitate the smooth progress of subsequent casing deformation repair operations or well workover operations. At present, the drilling gauge is mostly used to carry out the drilling operation, so it is very necessary to provide a drilling gauge. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B31/00
CPCE21B31/00
Inventor 王小东段宝玉杨永祥王丽娜马纪翔熊巍李华彦刘靓雯
Owner PETROCHINA CO LTD
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