Composite drill applicable to middle Yangtze Cambrian system shale gas exploitation

A shale gas mining and Cambrian technology, applied in the field of field drilling tools, can solve the problem that PDC bits cannot replace roller cone bits, and achieve the effects of improving drilling efficiency, expanding the scope of application, and reducing costs

Pending Publication Date: 2017-09-08
YICHANG SHENDA PETROMACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in hard and abrasive formations and complex directional drilling opera

Method used

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  • Composite drill applicable to middle Yangtze Cambrian system shale gas exploitation
  • Composite drill applicable to middle Yangtze Cambrian system shale gas exploitation

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Embodiment Construction

[0019] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0020] Such as figure 1 , figure 2 As shown, a compound drill bit suitable for Cambrian shale gas exploitation in the Middle Yangtze includes a drill body 14, which has a flushing cavity inside, and a cutting portion at the front end of the body, and the top of the cutting portion protrudes outward to form an arc shape. On the top surface, the protruding part of the cutting part is provided with three uniformly distributed main cutting edges 11, the main cutting edges 11 extend to the arc-shaped top surface and meet at the arc-shaped top surface, the main cutting edges 11 are formed along the drill body 14 is composed of a radial cutting surface and a back blade surface 16 extending in an arc to the surface of the body. The back blade surface ...

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Abstract

The invention discloses a composite drill applicable to middle Yangtze Cambrian system shale gas exploitation. The composite drill comprises a drill body, the inside of the drill body is provided with a flushing cavity, the front end of the body is provided with a cutting part, the top of the cutting part protrudes outward to form an arc top face, the cutting part is prominently provided with three evenly distributed main cutting blades, the main cutting blades extend to the arc top face and are converged at the arc top face, the portions, located at the gaps of the converging part of the cutting blades, of the arc top face are provided with three nozzles, the nozzles are communicated with the flushing cavity inside the drill body, the cutting part is further provided with a shaft neck part, the shaft neck part is provided with an opening, the opening is communicated with the flushing cavity, the top end of the shaft neck part is connected with a spherical sub cutting face in a clamping mode, and several particle-shaped subsidiary cutting blades are inlaid on the sub cutting face. According to the composite drill applicable to the middle Yangtze Cambrian system shale gas exploitation, the advantages of a PDC drill and a roller bit are combined, the hole drilling efficiency is improved, the application range of the drill is expanded at the same time, the cost is lowered, and the composite drill is applicable to the middle Yangtze Cambrian system shale gas exploitation.

Description

technical field [0001] The invention relates to the field of drilling tools, in particular to a composite drill bit suitable for the exploitation of Cambrian shale gas in the Middle Yangtze. Background technique [0002] Polycrystalline Diamond Compact (Polycrystalline Diamond Compact) drill, referred to as PDC drill. It is formed by using polycrystalline diamond (thin disc shape) to make a small cutting block and inserting it or sintering it on the bit body, which is suitable for soft to medium hard formations. [0003] At the beginning of the last century, the roller cone bit replaced the scraper bit in hard abrasive formations, but the disadvantage of this kind of bit in drilling shale and other plastic rock formations is mainly that the bottom hole mud bag is caused by the compression effect, and with the drilling depth and With the increase of the bottom hole pressure and the specific gravity of the mud, the mud bag phenomenon will be more serious. In order to solve t...

Claims

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Application Information

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IPC IPC(8): E21B10/43E21B10/60
CPCE21B10/43E21B10/60
Inventor 付正兵
Owner YICHANG SHENDA PETROMACHINE
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