Gas drive liquid self-circulation gas drilling positive screw drill

Abstract

The invention provides a gas drilling positive screw drill which is used for directional well drilling, horizontal well drilling and highly-deviated well drilling through a gas drilling technology, utilizes gas drive liquid self circulation and can stably output the torque; the drill comprises a motor assembly, a cardan shaft assembly and a transmission shaft assembly which are connected in sequence from top to bottom, the motor assembly comprises a blade, air inlets, a cam, air cylinders, pistons, a connecting rod, exhaust outlets, liquid inlets, hydraulic cylinders, liquid one-way valves, a liquid storage chamber, liquid outlets, a liquid injection chamber, a liquid injection hole, an anti-falling cap, a rotor, a stator and a motor assembly shell; in the gas drilling process, high pressure gas introduced from the ground is utilized for pushing the pistons to make high-speed reciprocating movement, incompressible liquid in a screw rod is driven to achieve self-circulation movement, pressure energy is converted into mechanical energy, the liquid drives the rotor to rotate, the torque which is stable and sufficient enough is output to a drill bit through a cardan shaft and a transmission shaft, and thereby gas drilling directional drilling operation is achieved. The drill has the advantages that the torque is output stably, and the service life of the drill is prolonged.

Description

technical field [0001] The invention relates to the technical field of drilling equipment, in particular to a gas drilling screw drilling tool which is used for drilling directional wells, horizontal wells and highly deviated wells with gas drilling technology, utilizes self-circulation of gas-displacement fluid, and can output torque stably. Background technique [0002] Gas drilling is a kind of underbalanced drilling technology, which mainly uses air, nitrogen, natural gas or diesel engine exhaust as the circulating medium. At present, gas drilling technology has been recognized by the world as a practical technology that can effectively shorten drilling time, reduce drilling costs, and liberate oil and gas layers, and has become an important means of efficient development of oil and gas fields. However, the existing gas drilling technology and equipment are mainly used in vertical wells, and cannot efficiently complete directional drilling to form directional wells, hori...

AI Technical Summary

Problems solved by technology

However, the existing gas drilling technology and equipment are mainly used in vertical wells, and cannot efficiently complete directional drilling to form directional wells, horizontal wells and multi-lateral wells, etc., which seriously limits the application range of gas drilling

The main reason for gas drilling difficulties is the lack of reliable key equipment suitable for directional drilling in gas drilling—gas drilling screw drilling tools

Because gas is a compressible medium, the output torque value of the conventional gas screw drilling tool is low and the torque output is unstable during use, causing the drilling tool to stop and rotate at high speed after release, and phenomena such as "speeding" appear, resulting in the existing gas Drilling screw drilling tools have poor performance and low life, and cannot perform gas drilling directional drilling stably, reliably, efficiently and safely

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