Internal connection type coiled tubing joint

A technology for oil pipe joints and oil pipes, which is applied to drill pipes, casings, drill pipes, etc., can solve the problem of difficult to achieve high standards of sealing water resistance, and achieve the effect of increasing sealing effect and connection firmness, and improving sealing water resistance performance.

Pending Publication Date: 2019-12-06
上海达坦能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an internal coiled tubing joint, which solves the defect that the sealing water resistance of traditional internal joints is difficult to reach a high standard

Method used

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  • Internal connection type coiled tubing joint
  • Internal connection type coiled tubing joint
  • Internal connection type coiled tubing joint

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Embodiment Construction

[0022] The application will be described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used to further illustrate the application, and cannot be interpreted as limiting the protection scope of the application. The above application content makes some non-essential improvements and adjustments to this application.

[0023] combine Figure 1 to Figure 3 As shown, an internal coiled tubing joint, the joint includes a shell, one end of the shell is provided with a threaded part 1 for connecting downhole tools; the other end of the shell is provided with a sealing sleeve 2, and when the joint When it is internally connected to the end of the coiled tubing, the sealing sleeve 2 seals the gap between the outer wall of the casing and the inner wall of the coiled tubing, and the outer wall of the casing is also provided with several hemispherical grooves 3 for screw insertion.

[002...

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Abstract

The invention discloses an internal connection type coiled tubing joint. The internal connection type coiled tubing joint comprises a housing, wherein one end of the housing is provided with a threaded part, and the other end of the housing is provided with a sealing sleeve; when the joint is internally connected to an end head of a coiled tubing, the sealing sleeve seals a gap between the outer wall of the housing and the inner wall of the coiled tubing, and the outer wall of the housing is also provided with a plurality of grooves. The internal connection type coiled tubing joint has the advantages that the sealing sleeve is arranged at the front end of the joint, so that a gap between the joint and the coiled tubing is blocked, liquid is prevented from leaking from the screw hole of thecoiled tubing and the end part of the coiled tubing, and the sealing and water resisting performance of the joint is improved; in addition, the rear end of the joint can be rotated to adjust the expansion degree of sealing sleeve, thus the access process is conveniently carried out; and moreover, the sealing sleeve is tightly propped to the inner wall of the coiled tubing by expansion, thus the sealing effect and the connection firmness are further improved; and the sealing and water sealing performance of the joint reaches high standard.

Description

technical field [0001] The invention relates to the technical field of drilling equipment, in particular to an internally connected coiled tubing joint. Background technique [0002] Coiled tubing is widely used in oil and gas field workover, drilling, well completion, well logging and other operations due to its advantages of saving operation time, uninterrupted circulating pumping of liquid, reducing formation pollution and improving operation safety. It is used in oil and gas field exploration and play an increasingly important role in development. Whether coiled tubing is used for drilling or downhole operations, special joints are required to connect downhole tools before the next step can be performed. [0003] There are two types of coiled tubing joints that are most common at present: external joints and internal joints. Among them, the external joint adopts the fixed method of built-in slips and rivets, and the positioning and fastening are completed at one time, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/02
CPCE21B17/02
Inventor 向长树
Owner 上海达坦能源科技股份有限公司
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