Gas-liquid coupling drive system for gas drilling

Abstract

The invention provides a gas-liquid coupling drive system for gas drilling. The system comprises a gas-liquid coupling stamping device, a hydraulic oil control device, a hydraulic motor mechanism andan oil tank assembly, wherein the gas-liquid coupling stamping device comprises a pneumatic impactor and a reciprocating pump, a piston of the pneumatic impactor can collide with a pump piston of thereciprocating pump, so that mechanical energy is transmitted to the pump piston, and the reciprocating pump can convert the mechanical energy into pressure energy of hydraulic oil; the hydraulic oil control device comprises a flow allocation unit, an energy storage unit and an adjusting unit; the hydraulic motor mechanism can receive the hydraulic oil conveyed by the adjusting unit and convert thehydraulic energy into mechanical energy; and the oil tank assembly can recover the hydraulic oil flowing out from the hydraulic motor mechanism and comprises an oil storage tank and a supercharger. According to the gas-liquid coupling drive system for gas drilling, the pneumatic impactor and the pump piston perform relatively independent motion and do not affect each other; and the hydraulic oilcontrol device can convey a stable power source to the hydraulic motor mechanism, fluid displacement required by a hydraulic motor is smaller, and operability is high.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas drilling, in particular to a gas-liquid coupling drive system for gas drilling. Background technique [0002] At present, domestic oil and gas resource exploration is becoming more and more difficult, and the target has turned to low-yield, low-pressure, low-permeability and other difficult-to-exploit oil and gas reservoirs, which contain a large number of water-sensitive, salt-sensitive, alkali-sensitive and clastic rock formations, and the permeability after interaction with drilling filtrate It is difficult to achieve reservoir protection or discover new gas reservoirs with conventional drilling methods. Practical experience at home and abroad shows that the use of gas drilling technology is more conducive to the discovery and protection of oil and gas layers, while the use of horizontal wells can increase the control area of ​​a single well, effectively increase the production of a sin...

AI Technical Summary

Problems solved by technology

Although the air screw adopts a series of structural optimization and improvement for the compressibility of gas, it can basically be used for foam and aerated drilling, but when the circulating medium is dry gas and atomization, the output torque and speed are greatly affected by the load, and the life Problems such as short, easy to fly motor, etc., serious lack of reliability

The self-rotating air hammer uses rotation and impact to break rock. The gas not only generates impact energy but also drives the bit to rotate. It requires very high pressure to achieve effective drilling. The force condition is bad during work, and the overall life of the drill tool is short. Limited torque is difficult to meet practical requirements

Due to the lack of reliable downhole power drilling tools, gas drilling can only rely on the power of the rotary table or top drive to drive the drill string to rotate, drive the drill bit to break the rock, and cannot slide the drilling control track

As a result of this method, gas drilling can only use the most primitive combination of centralizers to drill the vertical section, the stabilizing section and the horizontal section, the trajectory control lags behind and the efficiency is low, and the building section cannot be drilled at all.

The usual practice is to use gas drilling to increase the speed and control leakage in the vertical section and the stabilizing section, and to replace the mud in the building section and switch to conventional drilling, which greatly limits the development and application of gas drilling technology

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