Claw-sleeve type multi-stage cementing device

A technology of graded cement injectors and claw sleeves, which is applied in wellbore/well components, earthwork drilling, sealing/isolation, etc., and can solve problems such as complex assembly process, unstable product performance, and complex structure

Active Publication Date: 2018-05-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are problems of complex structure, high manufacturing cost and complex assembly process
Due to the complex structure, there are differences in processing capabilities among manufacturers, and the quality of the assembled step cementing device is difficult to be guaranteed, and the product performance is unstable.

Method used

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  • Claw-sleeve type multi-stage cementing device
  • Claw-sleeve type multi-stage cementing device
  • Claw-sleeve type multi-stage cementing device

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments in no way limit the present invention.

[0024] Such as figure 1 As shown, the claw-type step-by-step cementing device includes an upper joint 1, a cylindrical body 2, a sliding sleeve 3 fitted inside the cylindrical body 2, and closing sleeves that are sequentially fitted inside the sliding sleeve 3 and arranged at intervals from top to bottom. 5. Open the sleeve 6 and the anti-rotation sleeve 8; where,

[0025] The upper joint 1 is threaded on the top inner wall of the cylindrical body 2, and the cylindrical body 2 is fixed on the upper joint 1 by a plurality of fastening screws 4 arranged on the outer wall along the circumferential direction to prevent tripping; on the upper joint 1 The inner wall is provided with connecting internal threads for connecting casing strings; the inner diameter of the upper joint 1 i...

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Abstract

The invention discloses a claw-sleeve type multi-stage cementing device comprising a cylindrical body, a slide sleeve covered by the cylindrical body, a close sleeve and an open sleeve. The close sleeve and the open sleeve are orderly coated by the inner side of the slide sleeve from top to bottom; circulating holes communicating with each other are formed in the cylindrical body and the slide sleeve; the opening sleeve seals the circulating hole parts at first; elastic jaws on the top end of the slide sleeve are fixed on the cylindrical body via the close sleeve; guide spacing grooves are formed in the outer wall of the middle of the slide sleeve to space a downward movement distance between the slide sleeve and the cylindrical body, so the circulating holes formed in the cylindrical bodyand the slide sleeve can be staggered; the close sleeve and the open sleeve are separately arranged and fixed by shearing pins and the slide sleeve; and therefore, during the use, the circulating holes can be opened and closed when the close sleeve and the open sleeve downwardly move with a hydraulic action. Improvements are made on the basis of a traditional cementing device, so device structureand assembling technology are simplified and processing cost can be reduced; production efficiency can be improved; and stable performance is provided during the use, and well cementation quality canbe guaranteed.

Description

technical field [0001] The invention relates to the technical field of well cementing and completion tools in oil and gas well cementing and completion operations, in particular to a claw-type step-by-step cementing device. Background technique [0002] With the advancement of science and technology and the rapid development of drilling technology, the number of deep wells and ultra-deep wells is increasing in the process of oil and gas exploration and development. , it is essential to use graded cementing devices, and the consumption of graded cementing devices in on-site production is very large. [0003] There are many advantages of using graded cementing equipment for well cementing and completion operations. It can simplify the construction procedure, simplify the cementing equipment requirements, and reduce production costs; it can avoid the danger of high-pressure construction when the amount of cement slurry injected at one time is too large; prevent the formation fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 吴玉胜蒋本强张京华王志刚刘新哲李丹阳曹博古青周冀贾艳玲韩振强苟旭东宋剑鸣马淼蒋立坤
Owner BC P INC CHINA NAT PETROLEUM CORP
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