Telescopic pipe suitable for floating platform testing

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...

AI Technical Summary

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 telescopic tools have complex structures and are difficult to withstand the radial force generated by waves and undercurrent impacts in open water operations

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