Special-shaped polycrystalline diamond compact with secondary crushing function

A technology of polycrystalline diamond and secondary crushing, which is applied to drilling equipment, earthwork drilling, drill bits, etc. It can solve the problems of reducing the life of the composite sheet, increasing the efficiency of the composite sheet, and the application effect of the plastic formation is not obvious, so as to improve the rock breaking efficiency. efficiency effect

Active Publication Date: 2021-06-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Baker Hughes' special-shaped composite sheet has a structure similar to metal cutting chip breakers, which can help reduce the cutting force required for rock breaking, thereby improving rock breaking efficiency, but when applied in hard formations, the chip breaker structure may reduce Composite sheet life
Smith's ax-shaped teeth and protruding wedge-like structure can increase the efficiency of the composite sheet in breaking hard formations, but the application effect in plastic formations is not obvious

Method used

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  • Special-shaped polycrystalline diamond compact with secondary crushing function
  • Special-shaped polycrystalline diamond compact with secondary crushing function
  • Special-shaped polycrystalline diamond compact with secondary crushing function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Such as Figure 6 Shown is an axonometric view of one embodiment of the present invention, comprising a polycrystalline diamond layer 2 and a cemented carbide substrate 1 . The upper surface of the polycrystalline diamond layer 2 is provided with a chip flute 5 , a crushing part 7 , a cutting edge 10 , and a groove 3 . The characteristics and functions of each part are as follows:

[0067] The chip volume groove 5 is an inclined plane (the chip volume groove 5 can be designed as an arc surface structure or a plane structure), and the angle between the chip volume groove 5 and the horizontal plane is 15°-30°, which can remove the cut rock The cuttings are rolled up, causing the cuttings to curl and break;

[0068] The number of crushing parts-7 is 3. On the one hand, it can strengthen the structural strength of the composite sheet, and on the other hand, it can perform secondary crushing of large-grained rock chips, reduce cutting force, and improve cutting efficiency....

Embodiment 2

[0073] Such as Figure 7 Shown is an axonometric view of another embodiment of the invention comprising a polycrystalline diamond layer 2 and a cemented carbide substrate 1 . The upper surface of the polycrystalline diamond layer includes a chip flute 5 , a broken portion 7 , a cutting edge 10 , and a groove 3 . The characteristics and functions of each part are as follows:

[0074] The included angle between the chip rolling groove 5 and the horizontal plane is 15°-30°, which can roll up the cutting cuttings and make the cuttings curl and break;

[0075] The number of crushing parts-7 is 2. On the one hand, it can strengthen the structural strength of the composite sheet, and on the other hand, it can carry out secondary crushing of large-grained rock debris, reduce cutting force, and improve cutting efficiency. When the crushing part on one side is worn out, the crushing part on the other side can continue to function by rotating the composite sheet.

[0076] The groove 3...

Embodiment 3

[0080] Such as Figure 8 Shown is an axonometric view of another embodiment of the invention comprising a polycrystalline diamond layer 2 and a cemented carbide substrate 1 . The upper surface of the polycrystalline diamond layer includes a chip flute 5 , a broken portion 7 , a cutting edge 10 , and a groove 3 . The characteristics and functions of each part are as follows:

[0081] The included angle between the chip rolling groove 5 and the horizontal plane is 15°-30°, which can roll up the cutting cuttings and make the cuttings curl and break;

[0082] The number of crushing parts-7 is 4. On the one hand, it can strengthen the structural strength of the composite sheet, and on the other hand, it can perform secondary crushing of large-grained rock chips, reduce cutting force, and improve cutting efficiency. When the crushing part on one side is worn out, the crushing part on the other side can continue to function by rotating the composite sheet.

[0083] The groove 3 is...

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Abstract

The invention provides a special-shaped polycrystalline diamond compact with a secondary crushing function. The special-shaped polycrystalline diamond compact comprises a hard alloy matrix and a polycrystalline diamond layer, wherein one end of the polycrystalline diamond layer is fixedly connected with the hard alloy matrix; a groove is formed in the middle of the other end of the polycrystalline diamond layer; the other end of the polycrystalline diamond layer surrounds the groove to form a convex cutting part; a chip rolling groove surrounding the groove is formed in the joint of the cutting part and the groove; a convex crushing part I is arranged at the bottom of the groove; the section of the chip rolling groove is of an arc-shaped structure; and a convex crushing part II is arranged at the bottom of the chip rolling groove.

Description

technical field [0001] The invention belongs to the field of oil and gas drilling, and in particular relates to a high-efficiency rock-breaking PDC composite sheet which can improve the rock-breaking efficiency in both soft formations and hard formations and has a secondary crushing function. Background technique [0002] As an important link in the exploration and development of oil and gas resources, drilling engineering is the key to the efficient and safe development of oil and gas resources. How to improve drilling efficiency and save drilling costs is an important research direction in the field of oil and gas. Drill bit is an indispensable key technical equipment for breaking rocks and forming wellbore in drilling engineering, and its excellent performance directly determines drilling efficiency and economic cost. [0003] The PDC drill bit has the advantages of high ROP and long drilling life. At present, the diamond composite sheet used in the PDC bit commonly used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/54E21B10/43E21B10/60E21B10/62
CPCE21B10/54E21B10/43E21B10/602E21B10/62
Inventor 石昌帅范美筠
Owner SOUTHWEST PETROLEUM UNIV
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