Gas-liquid coupled punching device for gas drilling

Abstract

The invention provides a gas-liquid coupled punching device for gas drilling. The gas-liquid coupled punching device for gas drilling comprises a pneumatic impactor and a reciprocating pump which arefixedly connected on the same axis. The reciprocating pump comprises a pump cylinder barrel, a pump piston, a pump cylinder seat and a return elastic piece. The pump cylinder is fixedly connected withan outer cylinder barrel of the pneumatic impactor. The pump piston is arranged in the pump cylinder barrel, a first cavity is formed between the pump piston and a piston and used for collision between the piston and the pump piston, and the first cavity communicates with the outside. The pump cylinder seat is arranged in the pump cylinder barrel, a second cavity is defined by the pump cylinder seat, the pump piston and the pump cylinder barrel, and the second cavity communicates with an oil suction and discharge channel. The return elastic piece is arranged in the second cavity, and the twoends of the return elastic piece respectively act on the pump piston and the pump cylinder seat. The gas-liquid coupled punching device for gas drilling has the advantages that the piston of the pneumatic impactor and the pump piston independently move, the poor joint action coordination caused by the rigid connection of the piston of the pneumatic impactor and the pump piston is overcome, the defect that the piston of the pneumatic impactor is dragged by load during return of the piston of the pneumatic impactor is overcome, and the compressed gas energy of compressed gas can be converted into the pressure energy of hydraulic oil.

Description

technical field [0001] The invention relates to a gas-liquid coupling stamping device for gas drilling, which is mainly used in the field of oil and gas drilling, and belongs to the technical field of gas drilling (drilling) engineering. 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 contro...

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Problems solved by technology

However, the inventor has found through research that the downhole power drilling has the following disadvantages: one is that the pneumatic piston is rigidly connected to the hydraulic plunger, the working state of the pneumatic piston is restricted by the plunger of the reciprocating pump, and the return momentum of the pneumatic piston in the pneumatic subsection is much lower than that of the hydraulic plunger. Stroke momentum, easy to cause poor return stroke or failure to return stroke, compressed air power sub-joint is difficult to work continuously

The second is that the closed cycle liquid drive motor adopts the screw motor type, and the hydraulic oil displacement generated by the hydraulic power nipple cannot meet its requirements

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