Compound Impact Drilling Tools

Abstract

The invention relates to a composite impact well drilling tool, which comprises an upper pup joint and a middle outer casing in fixed connection, wherein the bottom of the middle outer casing is provided with a drill bit seat in a hanging way, the lower end of the inner side of the upper pup joint is provided with a flow divider, the side wall of the flow divider is provided with a flow dividing passage, the lower end of the flow divider is sequentially and fixedly connected with an upper spray nozzle, an upper cavity and a lower cavity, the upper part of the drill bit seat is provided with a lower spray nozzle in a sleeving way, the lower spray nozzle is glidingly arranged in the lower cavity, a sleeve, an end cover and an impact tube which are fixed in the axial direction and the circumferential direction are sequentially arranged at the inner side of the middle outer casing and are positioned under the upper pup joint from top to bottom, and a pendulum bob and a reversing tube are coaxially arranged inside the impact tube. The well drilling tool has the advantages that high-frequency axial impact loads generated through the upper spray nozzle, the upper cavity, the lower cavity and the lower spray nozzle exert on rock, so that a drill bit can easily cut into the rock, the rock breaking efficiency is improved, meanwhile, the high-frequency circumferential impact loads are generated through continuous reciprocating swinging of the pendulum bob, and the drill bit is prevented from generating a stick slip phenomenon when the cutting-in depth is greater.

Description

technical field [0001] The invention relates to a downhole drilling tool in the field of petroleum development, in particular to a composite percussion drilling tool. Background technique [0002] With the development of petroleum exploration and development, the proportion of complex wells such as deep wells and horizontal wells is gradually increasing. These complex wells pose many new challenges to drilling, among which improving the ROP of drilling is an urgent problem to be solved at present. In these complex wells, the downhole working conditions are relatively complex, including the increase of the overlying pressure of the rock, the increase of the friction of the wellbore to the drilling tools, etc., which pose great challenges to the existing drilling technology, not only will Cause the reduction of ROP, and also cause drilling accidents such as stuck pipe, thereby greatly increasing the cost of drilling. [0003] The existing drilling methods mainly realize rock...

AI Technical Summary

Problems solved by technology

However, limited by the existing technology, there is no tool that can increase the penetration depth of the PDC bit when drilling into hard formations

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