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Spring base type spherical centralizer

A spring seat and centralizer technology, applied in the direction of drill pipe, casing, drill pipe, etc., can solve problems such as secondary fishing, well diameter deformation, and affecting the life of centralizers, and achieve the effect of simple structure and easy replacement

Pending Publication Date: 2017-06-13
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing roller centralizers with axial or radial roller shafts, the roller shafts are all fixed on the centralizer. Although the frictional resistance can be reduced to a certain extent when lifting and releasing fishing tools, when the well diameter is irregular When the centralizer is running, it will cause a large impact force on the roller and the roller shaft, which will seriously affect the life of the centralizer. Especially when the centralizer runs to the fishing accident pipe section, the accident may cause the well diameter to be deformed. The existing centralizer is easy to jam, resulting in two salvage accident

Method used

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  • Spring base type spherical centralizer
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Embodiment Construction

[0010] Such as figure 1 , figure 2 As shown, a spring seat type spherical centralizer of the present invention is composed of an upper joint 1, an inner centralizing sleeve 2, an outer centralizing sleeve 3, a centralizing ball 4, a spring seat 5, a compression disc spring 6 and a lower joint 7. In that: the inner centralizing sleeve 2 is an annular ring body structure, and the annular ring body is evenly opened with circular blind holes, and the inner centralizing sleeve 2 is loaded along the stepped axis of the upper joint 1; the spring seat 5 is cylindrical, and the installation In the blind hole of the inner centralizing sleeve 2, it is fixedly connected with the inner centralizing sleeve 2 by screws, and the spring seat 5 ensures that the centralizer passes through the irregular section of the borehole diameter smoothly, and at the same time, the spring seat 5 can absorb the The lateral impact force on the centralizer; the centralizing ball 4 is placed in the spring sea...

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Abstract

The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a centering device for underground exploitation tools. According to the technical scheme, an inner centering sleeve is of an annular ring body structure; a spring base is in a cylindrical shape, and is fixedly connected to an inner centering sleeve through a screw; a centering ball is placed in the spring base; an outer centering sleeve is composed of an upper half ring and a lower half ring, the upper half ring and the lower half ring are fixed through a locking screw, and inner centering sleeve blind holes and outer centering sleeve through holes are evenly circumferentially formed to be three respectively and evenly circumferentially formed to be six in total; an upper connector is in a cylindrical shape, one end of the upper connector is provided with an inner thread, the other end of the upper connector is provided with an outer thread, the upper connector is provided with a center through hole, and the middle part of the upper connector is provided with a step; a lower connector is in a cylindrical shape, one end of the lower connector is provided with an inner thread, the other end of the lower connector is provided with an outer thread, and the lower connector is provided with a center through hole. The centering device for underground exploitation makes an exploitation tool successfully pass through an irregular well diameter, and achieves the purpose of reducing upper-hoist-lower-put friction and transverse impact simultaneously.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas fishing, in particular to a centralizing device for downhole fishing tools. Background technique [0002] The centering degree of fishing tools in the wellbore is an important factor for successfully handling fishing accidents, and the supporting centralizer is one of the important equipments to ensure the centering of fishing tools. In the existing roller centralizers with axial or radial roller shafts, the roller shafts are all fixed on the centralizer. Although the frictional resistance can be reduced to a certain extent when lifting and releasing fishing tools, when the well diameter is irregular When the centralizer is running, it will cause a large impact force on the roller and the roller shaft, which will seriously affect the life of the centralizer. Especially when the centralizer runs to the fishing accident pipe section, the accident may cause the well diameter to be deforme...

Claims

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Application Information

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IPC IPC(8): E21B17/10
CPCE21B17/1014
Inventor 梁政邓严邓兰刘稳谢帅
Owner SOUTHWEST PETROLEUM UNIV
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