Low-pressure-loss torsion impact drilling tool and rock breaking method

Abstract

The invention provides a low-pressure-loss torsion impact drilling tool and a rock breaking method. The low-pressure-loss torsion impact drilling tool comprises a torsion impact shell, a turbine assembly and a movable valve seat, wherein the torsion impact shell is vertically arranged, a first hole and a second hole are vertically formed in the movable valve seat, a third hole, a fourth hole, a second drain hole, a torsion impact cavity and a torsion impact hammer are formed in a turbine housing, a second cavity of the torsion impact cavity is divided into a first cavity which communicates with the third hole and a second cavity which communicates with the second drain hole by a protruding block of the torsion impact hammer, a turbine rotor is driven through drilling fluid, the movable valve seat is driven to rotate, the first cavity periodically communicates through the first hole and the second hole, and when internal high-pressure drilling fluid and external low-pressure drilling fluid periodically enter the first cavity, the torsional impact hammer periodically rotates clockwise to impact the torsion impact cavity and rotates anticlockwise to reset. According to the drilling tool and the rock breaking method, the drilling tool is operated through drill bit pressure drop, the pressure consumption is low, the PDC drill bit water power can be increased, and the drilling tool is combined with a conventional screw drilling tool, so that the drilling efficiency is improved.

Description

technical field [0001] The invention relates to the field of drilling engineering related to the development of oil and natural gas, in particular to a low-pressure consumption torsion impact drilling tool and a rock breaking method. Background technique [0002] Drilling accounts for more than 50% of the cost of oil and gas development, which requires large investment and high risk. Improving drilling efficiency is the best way to reduce the cost of exploration and development, and it is also an important goal that oil companies, drilling contractors and technical service companies have always pursued. In the past two years, international oil prices have dropped significantly, and competition has become increasingly fierce. Oil companies can gain competitive advantages only by paying more attention to efficient drilling, reducing costs and increasing efficiency, and possessing core technologies. Obviously, increasing drilling speed and reducing drilling cost are one of the ...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the above problems, the object of the present invention is to provide a low pressure consumption torsional impact drilling tool and rock breaking method, which is intended to solve the existing high pressure consumption of torsional impact, which reduces the water power of the drill bit and limits the contact with the screw rod. The problem of drilling tool combination is to solve the stick-slip phenomenon at the same time, further improve the rock-breaking efficiency of the drill bit and the rotation speed of the drill bit, thereby increasing the mechanical penetration rate, thereby improving the rock-breaking efficiency and prolonging the service life of the drill bit

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