An auxiliary downhole drilling tool

Abstract

The invention discloses a downhole auxiliary drilling tool. The downhole auxiliary drilling tool comprises an impact energy generator and an impact energy distributor, wherein the impact energy generator can convert the energy of drilling fluid so as to generate axial impact energy; the impact energy distributor can re-distribute the axial impact energy generated by the impact energy generator soas to form axial impact energy and circumferential impact energy, so that impact force with high-frequency variation in composite direction is provided for a drill bit, and meanwhile, the downhole auxiliary drilling tool can increase the axial impact force of the drill bit and enhance the composite impact force, so that the rock breaking efficiency and the mechanical drilling speed of the drillingtool are greatly improved. The downhole auxiliary drilling tool further comprises a shock absorber arranged between the impact energy generator and the impact energy distributor, and the shock absorber can reduce the axial vibration of the drilling tool and the impact of the drill bit, so that the service life of the drill bit is effectively prolonged.

Description

technical field [0001] The invention relates to the technical fields of petroleum industry machinery technology and drilling technology, in particular to an auxiliary downhole drilling tool. Background technique [0002] With the continuous development of oil drilling technology, many drilling tools with different functions have appeared in order to meet the needs of drilling engineering. With the rapid development of science and technology, the performance of drilling tools in the prior art has been greatly improved. [0003] However, in some special working conditions, there are still some problems. For example, when constructing in soft and hard formations or hard formations, due to the large lithology changes or high strength of such formations, the formation is soft and hard, and it is easy to induce downhole drilling tool vibration during the drilling process, resulting in the drill bit being in dynamic state for a long time. Unstable working condition. The instabil...

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Problems solved by technology

In addition, the downhole auxiliary drilling tool can also automatically store and release the torque exceeding the limit value during the drilling process, thereby effectively increasing the rock-breaking ability of the drill bit, improving the rock-breaking efficiency, and solving the problem of the drill bit in hard formations and interlayers. Drill jumping, stick-slip, "stall", slow mechanical drilling speed, etc.

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