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Casing tool capable of being pressed and circulated

A tool and casing technology, which is applied in the field of special tools for running casing, can solve the problems that the casing string cannot apply downward pressure, the casing running tool is simple, and the mud cannot be circulated, so as to improve efficiency and reduce bottom hole friction resistance, to ensure a smooth effect

Active Publication Date: 2011-10-05
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

Overcome the shortcomings of the current conventional casing running process, the casing running tool is simple, the mud cannot be circulated, and the downward pressure cannot be applied to the casing string

Method used

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  • Casing tool capable of being pressed and circulated
  • Casing tool capable of being pressed and circulated
  • Casing tool capable of being pressed and circulated

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] refer to Figure 4 . The casing running tool capable of pressurization and circulation is composed of three parts: a counterweight assembly 25 , a rotating assembly 26 and a circulation sealing assembly 27 . The counterweight assembly 25, the rotating assembly 26 and the circulation sealing assembly 27 are screwed together sequentially from top to bottom.

[0024] refer to figure 1 . The counterweight assembly includes a conversion joint 1, an upper fixed seat 2, a counterweight rod 4, a lower fixed seat 6, a retaining ring 8, a retaining ring outer cover 9 and a center pipe 10. The upper end of the counterweight assembly is an adapter 1. The upper end of the conversion joint 1 can be connected to the gooseneck and the high-pressure manifold through the gooseneck. There is a boss on the outer wall of the conversion joint 1 for installing an elevator, which can be used for installing an elevator during casing running construction. The lower end of the conversion joi...

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Abstract

The invention relates to a sleeve lowering tool capable of pressurizing and circulating and is applied to the technical field of well cementing operation of petroleum. The sleeve lowering tool is characterized in that a balance weight assembly, a rotation assembly and a circular sealing assembly are sequentially in threaded connection together from top to bottom. The upper end of the balance weight assembly is a switching joint. The lower end of the switching joint is connected with a central pipe through screw thread. The outer wall of the central pipe is provided with the balance weight assembly. The upper end of the rotation assembly is provided with an upper switching joint. The annular space between the lower switching joint and the upper switching joint is provided with a thrust nut, a unidirectional thrust ball bearing and a fixed nut from top to bottom. A cup leather type packer is sleeved on the outer wall of the lower end of a sealing shaft of the circular sealing assembly. The sleeve lowering tool has the advantages that when a sleeve is lowered, the tool can carry out slurry circulation and wellhead pressurization simultaneously. Through the coaction of two approaches,the tool alleviates the problems of large displacement of a shallow layer and the difficulty in lowering the sleeve to a ladder horizontal well of the shallow layer.

Description

technical field [0001] The invention relates to the technical field of cementing operations in oil drilling, in particular to a casing cementing tool, especially a casing special tool capable of circulating mud and exerting downward pressure on the casing string at the wellhead. Background technique [0002] Horizontal wells can greatly increase oil and gas production, increase oil recovery and reduce oil production costs. In recent years, horizontal wells have been developed rapidly. However, some shallow long-reach and shallow stepped horizontal wells have the characteristics of shallow vertical depth and long horizontal section, which results in relatively large frictional resistance on the pipe string at the bottom of the horizontal well. When the self-weight of the casing string is less than the sum of the buoyancy of the casing string and the borehole wall resistance during the casing running process, it is very difficult to horizontally run the casing. In the convent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/20E21B21/00
Inventor 贾涛王辉何军郑万江尹洪伟任荣权徐丙贵耿莉
Owner BC P INC CHINA NAT PETROLEUM CORP
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