Hydraulic axial propulsion percussion drilling tool and hydraulic axial propulsion percussion method

Abstract

The invention provides a hydraulic axial pushing impact drilling tool and a hydraulic axial pulling impact method. The drilling tool comprises an axial hydraulic cylinder assembly (1) and a rotary impact device assembly (2), wherein the axial hydraulic cylinder assembly (1) is arranged above the rotary impact device assembly (2); the axial hydraulic cylinder assembly (1) comprises a hydraulic cylinder group (101) and a push rod group (102); the tail end of the push rod group (102) is fixedly connected with the rotary impact device assembly (2) and is used for providing axial step hydraulic flexible pressing energy for the rotary impact device assembly (2). The hydraulic axial pushing impact drilling tool provided by the invention belongs to the axial pushing impact drilling tool capable of achieving a rotary impact function and providing flexible drilling pressure for a drill bit. The drilling tool has the advantages that the drilling efficiency is high; the mechanical drilling speed is high; the problems of insufficient stratum drill bit rock breaking energy and well drilling difficulty of a horizontal well, a large-displacement well, a long horizontal section, a complicated structure and the like can be solved; the problems of pulling pressing, drill bit clamping, drill bit slippage and bit bouncing are solved.

Description

technical field [0001] The invention belongs to the technical field of drilling, and in particular relates to a hydraulic axial propulsion percussion drilling tool and a hydraulic axial propulsion percussion method. Background technique [0002] With the continuous emergence of deep wells, ultra-deep wells, complex wells, horizontal wells, and extended-reach wells, and with the original conventional drilling equipment unchanged, for complex formations, due to the high friction in the long horizontal section and the difficulty of transmitting WOB, a large amount of energy Consumed in the compound vibration of the upper drilling tool for thousands of meters, resulting in slow mechanical drilling speed, insufficient rock-breaking energy of the drill bit and many accidents. Therefore, it is becoming more and more difficult for the drill bit to drill safely and quickly to the target layer. [0003] Although since 2010, the rotary impactor (that is, the torsion impact tool) has gr...

AI Technical Summary

Problems solved by technology

But it has no effect on drilling weight transmission, so the rotary impactor is currently only used in the vertical well section

On the other hand, in terms of drilling pressure transmission, although the rotary punching tool (axial vibration motor) of National Oil Well (NOV) can generate axial impact at a certain frequency, which has a certain effect in horizontal wells, but the axial impact makes the PDC bit composite Chips are easily damaged, the life of ordinary PDC bits is shortened, and the cost-effectiveness cancels each other out

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