PDC (Polycrystalline Diamond Compact) drill bit suitable for shale gas well shale stratum drilling

A technology for shale gas wells and drill bits, which is applied to drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of inability to obtain the ROP and footage, affect the service life of the drill bit, lose the rock-breaking effect, etc., so as to increase the comprehensive use benefit. , The negative cutting angle is suitable, and the effect of improving the service life

Inactive Publication Date: 2015-02-18
CHINA PETROLEUM & CHEM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional PDC drill bits cannot simply break rocks by shearing, but work by various rock breaking methods such as rolling, grinding and shearing, especially when drilling into siliceous strips, causing the cone top and shoulder The cutting teeth are prone to chipping and early wear, and lose the rock-breaking effect, thus affecting the service life of the drill bit and failing to achieve the ideal ROP and footage

Method used

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  • PDC (Polycrystalline Diamond Compact) drill bit suitable for shale gas well shale stratum drilling
  • PDC (Polycrystalline Diamond Compact) drill bit suitable for shale gas well shale stratum drilling

Examples

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Embodiment Construction

[0012] Such as figure 1 As shown, the PDC drill bit includes a crown 2 with a plurality of blades 1; as figure 2 As shown, the rotary contour line of the crown is composed of three sections: the inner cone section 3 extending outward along the inner cone from the concave center of the drill crown, and the circular arc section 4 extending from the edge of the inner cone to the outer gauge section And the gage section 5 with a straight line profile; the arc section 4 is composed of multiple arcs with different radii, and the radius of the arc gradually increases from the inside to the outside, which ensures the balanced change of the force on the drill bit from the structure and avoids the local teeth Excessive stress; cutting teeth 6 are distributed on these three profiles.

[0013] The cutting teeth 6 are evenly distributed in the inner cone section 3 and the gauge section 4, and the tooth density in the arc section increases with the increase of the radius of the arc. Acco...

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Abstract

The invention relates to drilling equipment of shale gas, in particular to a PDC (Polycrystalline Diamond Compact) drill bit suitable for shale gas well shale stratum drilling. The drill bit comprises a crown portion with a plurality of tool wings, wherein the revolution contour line of the crown portion consists of three sections, namely an inner cone section extending outwards along an inner cone from the concave center of the crown portion of the drill bit, a circular arc section extending from the edge of the inner cone to a gauge section on the outer side and a gauge section with a straight line contour, the circular arc section is formed by combining a plurality of sections of circular arcs with different radii, and the radii of the circular arcs are gradually increased from inside to outside; cutting teeth are distributed on the three sections of counters. The PDC drill bit can be suitable for drilling operation of shale stratums, and is high in drilling efficiency and long in service life.

Description

technical field [0001] The invention relates to drilling equipment for shale gas, in particular to a PDC drill bit suitable for drilling shale formations of shale gas wells. Background technique [0002] Shale gas resources, as an effective replacement resource for conventional oil and gas resources, have attracted much attention in recent years. However, in the actual drilling of shale gas wells, especially in the process of drilling shale formations, due to the lack of targeted PDC drill bits, the drilling efficiency is low and seriously affects Efficient exploration and development of shale gas. Because shale formations generally have the characteristics of ancient formations, high compressive strength, high siliceous and carbon content in shale, and even large siliceous strips. Conventional PDC bits cannot simply break rocks by shearing, but work by various rock breaking methods such as rolling, grinding and shearing, especially when drilling siliceous strips, causing t...

Claims

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Application Information

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IPC IPC(8): E21B10/43E21B10/60
CPCE21B10/43E21B10/60
Inventor 贺庆王彦祺沈建中王洪亮印中华曹建山汪琼赵丽
Owner CHINA PETROLEUM & CHEM CORP
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