Telescopic pipe suitable for floating platform testing

A floating platform and telescopic tube technology, applied in the field of petroleum exploration, can solve the problems of complex structure of telescopic tools and difficulty in bearing radial force, and achieve the effects of reducing the risk of unsealing, weakening radial force, and reducing wear

Inactive Publication Date: 2017-02-15
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In summary, the main seawater corrosion area faced by open water operations is the full immersion corrosion area, and the existing telescopi

Method used

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  • Telescopic pipe suitable for floating platform testing
  • Telescopic pipe suitable for floating platform testing
  • Telescopic pipe suitable for floating platform testing

Examples

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Example Embodiment

[0023] The present invention will be described in detail below with reference to the drawings and embodiments.

[0024] Such as Figure 1 ~ Figure 3 As shown, the present invention includes an outer cylinder string and a mandrel string located inside the outer cylinder string. The outer cylinder string includes an upper joint 1, a spline outer cylinder 2 and a sealing pup joint 3. Wherein, the upper and lower ends of the spline outer cylinder 2 are provided with internal threads. The lower end of the upper joint 1 is matedly connected with the upper end of the spline outer cylinder 2 through external threads. The upper end of the sealing pup joint 3 is matedly connected with the lower end of the spline outer cylinder 2 through external threads. The mandrel string includes spline stub 4, torsion mandrel 5 and lower joint 6. Wherein, the upper and lower ends of the torsion mandrel 5 are provided with external threads. The lower end of the spline stub 4 is matedly connected wit...

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Abstract

The invention relates to a telescopic pipe suitable for floating platform testing. The telescopic pipe is characterized by comprising an outer cylinder string and a core shaft string located in the outer cylinder string; the outer cylinder string comprises an upper connector, a spline outer cylinder and a sealing short joint, wherein inner threads are arranged at the upper end and the lower end of the spline outer cylinder correspondingly, the lower end of the upper connector is connected with the upper end of the spline outer cylinder through an outer thread in a matched manner, and the upper end of the sealing short joint is connected with the lower end of the spline outer cylinder through an outer thread in a matched manner; the core shaft string comprises a spline short joint, a torsion core shaft and a lower connector, wherein outer threads are arranged at the upper end and the lower end of the torsion core shaft correspondingly, the lower end of the spline short joint is connected with the upper end of the torsion core shaft through the corresponding inner thread in a matched manner, the upper end of the lower connector is connected with the lower end of the torsion core shaft through the corresponding inner thread in a matched manner; and the spline short joint is arranged on the inner side of the spline outer cylinder in the manner that the spline short joint can slide and cannot rotate.

Description

Technical field [0001] The invention relates to a telescopic tube suitable for testing on a floating platform and belongs to the field of petroleum exploration. Background technique [0002] The floating operation characteristics of the floating platform make its operating pipe string frequently subjected to the pulling or compressing force generated by floating up and down the platform, as well as small lateral shearing force; therefore, the operating pipe string needs to be installed As a tool for compensating the shrinkage of the pipe string, in the prior art, round mandrel expansion joints, DST expansion pipes or BH-C expansion pipes are commonly used at home and abroad. Here are three existing scaling tools: [0003] The main function of the round mandrel expansion joint is to compensate for the floating of the drilling pontoon to ensure proper gravity on the downhole tools. It can also be used to compensate for the elongation of the pipe string due to temperature and pressur...

Claims

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Application Information

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IPC IPC(8): E21B17/08
CPCE21B17/08
Inventor 何玉发周建良李清平魏剑飞吴轩孙明
Owner CHINA NAT OFFSHORE OIL CORP
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