Double drill bit torque self-balancing pressure adjusting device

Abstract

The invention discloses a double drill bit torque self-balancing pressure adjusting device, and belongs to the field of well drilling and misering. The double drill bit torque self-balancing pressureadjusting device comprises an external drill bit pressure adjusting assembly, an inner drill bit pressure adjusting assembly and a pressure adjusting pushing rod assembly. According to the double drill bit torque self-balancing pressure adjusting device, characteristics of a pressure-transmitting bearing are utilized, the situation that the drilling pressure is transmitted from an upper static drilling tool to a lower rotary drilling tool is realized, no torque effect acts on the upper drilling tool, and static-dynamic conversion and pressure transmitting of the drilling tools are achieved; and meanwhile, when an inner drill bit and an outer drill bit drill and encounter stratums with different hardness, synergistic action of an internal pressure sensor, an external pressure sensor and a pressure adjusting pushing rod is utilized to realize automatic adjusting of the drilling pressure applied to the inner drill bit and the outer drill bit, the drilling pressure applied to the inner drill bit and the outer drill bit is dynamically distributed so that the inner drill bit and the outer drill bit can conduct synergistic action while working, the conditions of drilling bit jamming and different abrasion degrees of the inner drill bit and the outer drill bit due to uneven force applied to the inner drill bit and the outer drill bit when the inner drill bit and the outer drill bit drill and encounter different stratums are avoided, and the rock-breaking efficiency of the drill bits can be greatly improved.

Description

technical field [0001] The invention belongs to the field of well drilling and drilling, in particular to a torque self-balancing pressure regulating device for double drill bits. Background technique [0002] During the drilling and drilling process, the drill string is subject to a large rotational torque, which mainly comes from the rotating rock of the drill bit, the friction of the well wall or hole wall, and the mud resistance in the well. Under the action of the huge reverse torque, the drill string is seriously deformed and spiral shape, and the deeper the well, the greater the deformation. At the same time, during the rotation, the drill string collides with the well wall, and the wear and alternating loads can easily damage the drill string in advance, resulting in in-hole accidents such as broken drilling tools, which bring huge losses to the entire project. Obviously, the reverse torque generated by the rotation of the drilling tool in the well and rock fragment...

AI Technical Summary

Problems solved by technology

At the same time, during the rotation, the drill string collides with the well wall, and the wear and alternating loads can easily damage the drill string in advance, resulting in the occurrence of in-hole accidents such as broken drilling tools, which brings huge losses to the entire project.

Obviously, the reverse torque generated by the rotation of the drilling tool in the well and rock fragmentation endangers the entire drill string and ground equipment, and also leads to a series of adverse consequences such as poor well quality, long drilling cycle, and high drilling cost.

For this reason, in the prior art, "a downhole torque self-balancing cabled drilling tool system, the patent document application number is 201710082518.8" and "a downhole torque self-balancing cabled drilling tool system, the patent document announcement number is CN206448779U" , fundamentally solve the reverse torque hazard caused by drill string rotary drilling, change the disturbance intensity of the drill bit's one-way broken rock to the surrounding rock, simplify the ground drilling equipment and supporting tools and techniques, and achieve less accidents in the well, low drilling cost, Low energy consumption and high drilling efficiency, but when the inner and outer drills encounter formations with different hardness, the uneven force on the inner and outer drills will lead to different degrees of wear and sticking of the inner and outer double drills

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