Pressurized propulsion tool for horizontal well

Abstract

The invention relates to a pressurized propulsion tool for horizontal well drilling in an oil and gas industry. The pressurized propulsion tool solves the problem of depressurization and feeding difficulties of horizontal drill string. The technical scheme comprises that a upper sub is connected with a upper drill string by threading and a output shaft is connected with a lower drill string by threading; upper end of a stator shell is connected with the lower end of the upper sub by threading, and the lower end of the stator shell is connected with the upper end of a universal shaft shell by threading; the upper end of the universal shaft shell is connected with the lower end of a screw rotor by threading, and the lower end of the universal shaft shell is connected with the upper end of a center tube by threading; a magnetic ring is embedded in the end face of a raised steps which is in the lower end of the universal shaft shell; a locking pin and a spring a are integrally arranged in a axial stepped hole of the upper end face of a propulsion cylinder, and a slider block and a spring b are integrally arranged in a radial counter bore of the upper part of the outer circumference of the propulsion cylinder; the lower end of a outer shell is connected with a release cap by threading. The pressurized propulsion tool utilizes the principle of the screw transmission, the output shaft can provide axial thrust, push the lower drill string feed-in, effectively extend the horizontal drilling length and improve the economic efficiency.

Description

technical field [0001] The invention relates to a pressurized propulsion tool for drilling horizontal wells in the petroleum and natural gas industry. Background technique [0002] In the oil and gas industry, horizontal wells have been widely developed due to their good economic benefits. Especially in the development and application of shale gas, horizontal well fracturing operations have almost become an essential process. The salient feature of horizontal wells is that they have very long well sections in oil and gas reservoir formations. Generally, wells with a well inclination angle of more than 85° can be called horizontal wells. However, as the length of the horizontal well section increases, the weight of the drill string in the horizontal section will continue to increase, which directly leads to an increase in the frictional resistance between the drill string in the horizontal section and the borehole, making it difficult to feed the drill string and further incr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a pressurized propulsion tool for horizontal wells in order to solve the problems of depressurization and difficulty in feeding the drill string in the horizontal section.

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