High-frequency water jet turbine drilling tool

Abstract

The invention relates to a high-frequency water jet turbine drilling tool, and belongs to the technical field of petroleum and shale gas well underground tools. The high-frequency water jet turbine drilling tool is composed of an upper shell, a lower shell, an upper connector, a lower connector, a turbine shaft, a main shaft, a cylindrical cam and a pressurizing device. The upper connector is installed at one end of the upper shell in a threaded mode, the lower shell is installed at the other end of the upper shell in a threaded mode, the lower connector is installed at the end of the lower shell in a threaded mode, the turbine shaft is installed inside the upper shell through a turbine assembly, and the main shaft is installed on one side of the turbine shaft through a main shaft bearing. The pressurizing device is driven by the main shaft to rotate, drilling liquor is compressed to generate high pressure to form high-pressure hydraulic power jet flow which acts on a drill bit so as to assist shale breaking through the drill bit, and therefore the efficiency of shale breaking is improved through the drill bit; the high-frequency water jet turbine drilling tool has the advantages of being simple in structure and good in practicability, and has positive meaning for shortening of well construction period, lowering of drilling cost and improving of construction efficiency.

Description

technical field [0001] The invention relates to a high-frequency water jet turbine drilling tool, which belongs to the technical field of petroleum and shale gas downhole tools. Background technique [0002] Research at home and abroad shows that ultra-high pressure jet-assisted drilling can greatly increase the mechanical penetration rate in drilling oil and gas wells. An ultra-high-pressure jet-assisted drilling system developed abroad directly acts on the drilling fluid at the bottom of the well to assist the drilling of the drill bit. The mechanical rock breaking effect can increase the ROP by 2~3 times in deep oil and gas wells. The high cost and pumping difficulties of the twin-tube drilling system limit the commercial application of the system, but its ability to greatly increase the rate of penetration allows people to see the great potential of ultra-high pressure jet-assisted drilling. [0003] Bottom-hole pressurized ultra-high pressure jet-assisted drilling tech...

AI Technical Summary

Problems solved by technology

[0003] Bottom-hole pressurized ultra-high pressure jet-assisted drilling technology uses a specially designed bottom-hole pressurized device with a special drill bit to realize ultra-high-pressure jet-assisted drilling. Due to the limitation of the borehole size of oil drilling, hydraulically driven large-diameter piston pairs are often used at home and abroad. The reciprocating motion of the plunger pair realizes bottom-hole pressurization. Although it can achieve the purpose of bottom-hole pressurization, it has the disadvantages of complex structure and high production cost. Therefore, it is necessary to improve it

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