Mechanical composite percussion boring speed increasing tool
A percussive drilling and mechanical technology, which is applied to drilling equipment, driving devices for drilling in wellbore, and earth-moving drilling, etc. High performance and wide applicability
Active Publication Date: 2018-11-30
BEIJING UNIV OF TECH +1
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Problems solved by technology
[0007] The purpose of the present invention is to provide a mechanical compound percussion drilling speed-increasing tool to overcome the problems of short service life of the drill bit and low rock breaking efficiency in the prior art. The mechanical compound percussion drilling speed-increasing tool combines axial impact and torsional impact Combined, compound percussion effectively improves rock breaking efficiency and bit life
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[0054] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.
[0055] Such as Figure 1 to Figure 5 As shown, the present invention provides a mechanical compound percussion drilling speed-increasing tool 100, which includes a hollow tool shell 1, and the top of the tool shell 1 is sealed with the upper drilling tool (downhole dynamic drilling tool or drill collar, prior art) Connected, the bottom of the tool housing 1 is fixedly connected with a drill seat 2, and the bottom of the drill seat 2 is sealed and connected to the drill bit (the prior art), and the tool housing 1 is provided with a drive shaft 3 that can rotate under the impact of the fluid, and the drive shaft 3 The lower part of the casing is equipped with an impact hammer 4 that is fixed in the circumferential direction and can...
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The invention relates to a mechanical composite percussion boring speed increasing tool. The tool comprises a tool shell of which the inner portion is hollow, the bottom of the tool shell is fixedly connected with a drill bit seat, the tool shell is internally provided with a driving shaft capable of rotating under the impact of a fluid, the lower portion of the driving shaft is provided with an impact hammer circumferentially fixed and capable of reciprocating in an axial direction, and the lower portion of the impact hammer is provided with an impacting device capable of transmitting an axial impact load and a torsional impact load to the drill bit seat. The mechanical composite percussion boring speed increasing tool combines axial impact and torsional impact, and the composite impact effectively improves the rock breaking efficiency and prolongs the service life of a drill bit.
Description
technical field [0001] The invention relates to a downhole drilling tool in the field of petroleum development, in particular to a mechanical compound percussion drilling speed increasing tool. Background technique [0002] With the development of existing drilling technology, there are more and more cases of drilling hard formations. However, in the current drilling process of hard formations, it is easy to have low ROP and short service life of the drill bit. These problems greatly increase non-drilling time and increase drilling costs in hard formations. [0003] At present, the main reason for this kind of problem is that the rock hardness of the deep well formation is relatively high. When the conventional rotary cutting rock breaking method is adopted, the pressure transmitted from the drill pressure to the drill bit is static pressure, and the cutting depth of the drill bit is limited, which makes the rock breaking efficiency of the drill bit reduce. In deep hard f...
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IPC IPC(8): E21B4/16
CPCE21B4/16
Inventor 查春青柳贡慧李军汪伟席岩
Owner BEIJING UNIV OF TECH