A cyclic short joint capable of repeated opening and closing

Abstract

The invention discloses a circulating nipple capable of being opened and closed repeatedly. A through hole is formed in a shell along the shaft axis, the through hole comprises a thin-hole section and a thick-hole section, a nozzle is installed on the pipe wall of the slim-hole section of the shell in the radial direction, a breathing hole is formed in the pipe wall of the thick-hole section of the shell in the radial direction, and a transposition piston is arranged in the through hole of the shell in a sleeved mode; a through axis hole is formed in the transposition piston, the lower end of the transposition piston is provided with a stepped surface, multiple convex blocks are arranged on the lower end surface of the stepped surface along the circumference, multiple J-shaped grooves are formed in the circumferential surface of the upper side of the stepped surface, and a dividing hole is formed in the upper end of the transposition piston in the radial direction; multiple guide pins and limit pins are installed on the pipe wall of the shell along the circumference in the radial direction, and the inner end of each guide pin is correspondingly inserted into one J-shaped groove; a lower end cover is installed at the inner edge of a lower end opening of the pipe wall of the shell, a spring inner barrel is installed in the lower end cover in a sleeved mode, and a spring is installed on the circumference of the spring inner barrel in a sleeved mode. The circulating nipple is put into a well once and can be opened and closed repeatedly without being put out of the well.

Description

technical field [0001] The invention belongs to the technical field of petroleum machinery, and relates to a cycle joint capable of repeated opening and closing. Background technique [0002] It is often necessary to divert fluids in the borehole to the borehole annulus during drilling. For example, diversion operations are necessary when the fluid flow rate driving the drilling tool is insufficient to return cuttings in the borehole annulus to the surface. Under these conditions, the circulation sub can be used to return the cuttings in the annulus to the surface while maintaining the minimum flow required for the normal operation of the drilling tool. [0003] The diverter hole of the circulation nipple has two states of open and closed. The traditional circulation nipple controls whether the shunt hole is opened by throwing a ball, and the spring resets after throwing the ball. This type of circulation nipple has the following disadvantages: 1) The circulation nipple ca...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a circulating sub joint that can be opened and closed repeatedly, which solves the problem that the circulating sub joint in the prior art can only be reset and used once, and if it needs to be opened and diverted for the second time, it must be tripped out to take out the ball and affect the work efficiency. question

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