Composite drill bit

A composite drill bit and bit body technology, which is applied to drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of low drilling efficiency and low ROP, so as to increase the footage of the drill bit, increase the ROP, and ensure smooth drilling. Effect

Inactive Publication Date: 2017-05-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the working principle of the impregnated diamond bit is grinding and plowing, resulting in a low ROP and low drilling efficiency

Method used

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  • Composite drill bit
  • Composite drill bit
  • Composite drill bit

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Embodiment Construction

[0039] The above-mentioned technical features and advantages of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some, not all, embodiments of the present invention.

[0040] see figure 1 Shown, a kind of compound drill bit, it comprises columnar joint 10 and the drill body 20 that is connected on the joint 10, compound drill bit also comprises at least three blades 30, and at least three blades 30 are uniform along the circumferential direction of drill body 20 Arranged on the drill body 20 , each blade 30 extends from inside to outside along the radial direction of the drill body 20 , and each blade 30 has a crown profile on its outer surface, and the crown profile is a curve.

[0041] see figure 2 and image 3 As shown, the composite drill bit also includes a plurality of cutting teeth 40 and a plurality of grinding teeth 50 fixedly arranged on the contour of...

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PUM

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Abstract

The invention provides a composite drill bit. The composite drill bit comprises a columnar connector and a drill bit body connected to the connector. The composite drill bit further comprises at least three knife blades arranged on the drill bit body evenly in the circumferential direction of the drill bit body. All the knife blades extend from inside to outside in the radial direction of the drill bit body. The outer side face of each knife blade is provided with a crown profile which is a curve. The composite drill bit further comprises a plurality of cutting teeth and a plurality of grinding teeth which are all fixedly arranged on the crown profiles. All the cutting teeth are arranged in a row in the extending direction of the knife blades. All the grinding teeth are arranged in a row in the extending direction of the knife blades. The row where all the grinding teeth are located is located behind the row, where all the cutting teeth are located, in the rotary direction of the drill bit body. The peak heights of all the grinding teeth are smaller than that of the cutting teeth on the same circumference. Through the composite drill bit, machine drilling speed and drill bit drilling depth are increased, the service life is prolonged, and the drilling rock breaking efficiency of the drill bit is also improved.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas drilling, in particular to a composite drill bit. Background technique [0002] With the deepening of exploration and development of oil and gas fields, the stratum encountered in actual drilling is getting deeper and deeper, and the stratum structure is becoming more and more complex, which makes drilling more and more difficult. Especially in deep extremely hard and abrasive formations, such as granite, igneous rock and tight sandstone, etc., the drilling speed is slow, the life of the drill bit is short, the drilling cycle is long, and the drilling cost is high, which restricts the overall benefits of exploration and development. The service life of the drill bit and rock-breaking efficiency are the key factors to improve drilling efficiency. Therefore, how to improve the drilling speed in extremely hard and abrasive formations is a technical problem to be solved urgently. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/43E21B10/54
CPCE21B10/43E21B10/54
Inventor 孔璐琳闫静刘新云邓峰陶冶东振张国辉李令东
Owner PETROCHINA CO LTD
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