Pulsating impact drilling tool

Abstract

The invention provides a pulsating impact drilling tool. The pulsating impact drilling tool comprises a shell body, wherein a shell center hole which penetrates through in the axial direction is formed in the shell body; a drill bit base is arranged at the other end of the shell body; a drill bit base center hole which penetrates through in the axial direction is formed in the drill bit base; a circumferential impact structure which can generate circumferential reciprocating impact to the drill bit base and is axially fixed is sleeved with the shell center hole; a first drilling fluid channelwhich penetrates through in the axial direction is arranged in the circumferential impact structure; an axial pulsating impact structure which can generate axial pulsating impact to the drill bit baseis axially and fixedly arranged at one end, close to the circumferential impact structure, in the drill bit base center hole; a second drilling fluid channel which penetrates through in the axial direction is arranged in the axial pulsating impact structure; and the second drilling fluid channel can be communicated with the first drilling fluid channel. By combining with the characteristics of apulsed jet tool and a torsion impact device, the pulsating impact drilling tool effectively increases the rate of penetration of a hard stratum, improves the rock breaking efficiency and reduces the drilling cost of the hard stratum.

Description

technical field [0001] The invention relates to the technical field of oil development, in particular to a pulse impact drilling tool. Background technique [0002] With the development of drilling technology, drilling is gradually developing towards hard formations, and in the drilling process of deep wells in hard formations, low mechanical penetration rate and PDC bits (PDC, short for polycrystalline diamond compact bits, which are geological drilling tools) are common. A drilling tool commonly used in the industry) has problems such as rapid failure. At present, conventional drilling methods or composite drilling methods are commonly used for this kind of formation. The conventional drilling method is to drive the drill pipe and the drill bit to rotate through the turntable to break the rock and form a wellbore. The composite drilling method is to drive the drill pipe to rotate through the rotation of the turntable, and at the same time, the downhole power drilling too...

AI Technical Summary

Problems solved by technology

However, the energy required for this direct rock breaking is large, that is, a large impact load is required. Generally speaking, a large impact load is unfavorable to the service life of the tool, which limits its use and cannot effectively improve the rock breaking efficiency. In general tool design, when the applicable energy is equal, the frequency of large impact loads is relatively low

[0005] At the same time, during the drilling process of hard formations, stick-slip vibration of the PDC bit is prone to occur. One of the main reasons for this situation is that when the PDC bit encounters hard formations, the torque fluctuation at the bit is relatively large

When percussion drilling is used in the process of conventional drilling, it is easy to change the axial pressure at the drill bit, change the resistance torque at the drill bit, and produce fluctuations in the speed of the PDC bit

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