Pressure-adjustable hydraulic thruster

Abstract

The invention relates to a pressure-adjustable hydraulic thruster, and belongs to the technical field of petroleum drilling tools and machines. The pressure-adjustable hydraulic thruster comprises an upper connector, a core shaft, a middle connector, a first-stage secondary cylinder body, a second-stage secondary cylinder body and a flow plug, wherein a main cylinder body is installed on the core shaft in a sliding mode; one side of the main cylinder body is provided with the first-stage secondary cylinder body and the second-stage secondary cylinder body in a threaded mode through the middle connector; one end of the second-stage secondary cylinder body is connected with the main cylinder body in a threaded mode; an end socket of the first-stage secondary cylinder body is provided with the upper connector in a threaded mode; and the flow plug is arranged on the inner side of the upper connector. By means of the pressure-adjustable hydraulic thruster, the problems that when an existing drilling tool is put down too fast, a liquid cylinder is pressed tightly, and when the drilling tool is put down too slowly, a drill bit is in an idle state, and the drilling efficiency is lowered are solved effectively. The pressure-adjustable hydraulic thruster has the characteristics of being simple in structure and good in practicability. A drilling work operator can guide normal conduction of well drilling by observing the change of the pressure read number of drilling liquid, and the pressure-adjustable hydraulic thruster is particularly suitable for installation and use of drilling wells such as horizontal wells and large-displacement extending wells.

Description

technical field [0001] The invention relates to a pressure-adjustable hydraulic thruster, which belongs to the technical field of petroleum drilling tool machinery. Background technique [0002] In conventional drilling operations, whether it is traditional rotary table drilling or bottom hole motor drilling, the weight of the drill string is used to apply the drilling pressure. However, in the process of drilling highly deviated wells and horizontal wells, due to factors such as increased well inclination, large borehole wall friction resistance, and poor rigidity of small-sized drilling tools, the traditional method of relying on the weight of the drill string to apply the WOB in conventional drilling It can no longer meet the construction needs well. Subsequently, some downhole tools using flexible hydraulic pressure appeared one after another. For example, at the end of the 20th century, Li Zifeng’s team at Yanshan University designed and developed a single-stroke hydra...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method that can effectively adjust the drilling pressure when the drilling tool is lowered too fast or too slow; to solve the problem of reducing the drilling efficiency due to the idling of the drill bit when the existing drilling tool is lowered too fast or too slow Adjustable pressure hydraulic thruster

Images