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Graded cement injector

A technology of graded cementing device and hole sleeve, which is applied in the direction of wellbore/well parts, earthwork drilling, sealing/isolation, etc. It can solve the problem of complex structure of graded cementing device, difficulty in guaranteeing machining accuracy, and long overall length of tools, etc. problem, to achieve the effect of simple structure, lower manufacturing cost and easy processing

Active Publication Date: 2017-01-11
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

At present, most of the staged cementing devices used in well completion construction need to inject plugs twice into the pipe string to hold back the pressure to complete the cementing and cementing operation. The structure of this staged cementing device is complicated, the operation is cumbersome, and the overall length of the tool is too long , the production and processing cost is high, and the processing accuracy is difficult to guarantee

Method used

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Embodiment Construction

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0021] like figure 1 As shown, the present invention provides a graded cementing device, which includes a main body 1, a closed hole sleeve 2 and an open hole sleeve 3, wherein: the lower end of the main body 1 is connected with a lower inner sleeve 4, and the upper end of the main body 1 is provided along the circumferential direction. There are a plurality of circulation holes 11; the closing hole sleeve 2 is pierced and connected in the body 1 through the f...

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Abstract

The invention provides a stage cementer. The stage cementer comprises a body, a hole closing sleeve and a hole opening sleeve, wherein the lower end of the body is connected with a lower inner sleeve; the body is provided with a plurality of circulation holes along the circumferential direction; the hole closing sleeve is connected into the body through a first shear pin in a penetrating manner and is positioned above the plural circulation holes; the inner side of the upper end of the hole closing sleeve is connected with an inner core in the penetrating manner; the hole opening sleeve is arranged in the body in the penetrating manner; the upper end of the hole opening sleeve is in hermetical contact with the lower end of the hole closing sleeve, and the lower end of the hole opening sleeve is connected to the lower inner sleeve through a second shear pin. According to the stage cementer, hole opening or hole closing of the stage cementer can be safely and smoothly realized, and smooth cementing operation is guaranteed; the stage cementer has a simple structure and is easy to machine, the production and manufacturing cost is reduced, and the field use is convenient.

Description

technical field [0001] The invention relates to a cement injector, in particular to a graded cement injector used in the field of oil and gas exploration and development. Background technique [0002] In the field of oil and gas exploration and development, graded cementing can effectively improve the quality of cementing and reduce the risk of drilling and completion operations. At present, most of the staged cementing devices used in well completion construction need to inject plugs twice into the pipe string to hold back the pressure to complete the cementing and cementing operation. The structure of this staged cementing device is complicated, the operation is cumbersome, and the overall length of the tool is too long , the production and processing cost is high, and the processing accuracy is difficult to guarantee. [0003] Therefore, it is necessary to provide a new graded cementing device to overcome the above-mentioned defects. Contents of the invention [0004]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 袁进平齐奉忠刘斌辉王兆会
Owner BC P INC CHINA NAT PETROLEUM CORP
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