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Cutting-grinding type impregnated diamond blocks and PDC clad sheet mixed drill bit

A technology of impregnated diamond and impregnated blocks, which is applied in the field of cutting-grinding diamond and PDC composite sheet mixed drill bits, which can solve the problems of roller cone bits and diamond bits adapting to single formations, so as to avoid early collapse and avoid The effect of anti-coring and enhanced cutting ability

Active Publication Date: 2018-06-22
CHENGDU DEEP DIAMOND BIT
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AI Technical Summary

Problems solved by technology

[0003] An object of the present invention is to provide a cutting-grinding type impregnated diamond block and PDC composite sheet mixed drill bit, this cutting-grinding type impregnated diamond block and PDC composite sheet mixed drill bit is used to solve the existing PDC drill , roller cone bits and diamond bits are suitable for single formation problems

Method used

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  • Cutting-grinding type impregnated diamond blocks and PDC clad sheet mixed drill bit
  • Cutting-grinding type impregnated diamond blocks and PDC clad sheet mixed drill bit
  • Cutting-grinding type impregnated diamond blocks and PDC clad sheet mixed drill bit

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Embodiment Construction

[0021] The present invention will be further explained below in conjunction with the drawings:

[0022] Combine figure 1 , figure 2 , Figure 7 As shown, this cutting-grinding type impregnated diamond block and PDC composite chip mixed drill bit is a knife-wing type drill. In order to ensure the stability and service life of the drill wing, and avoid early stress concentration and collapse, a trapezoid is adopted Blade 8, the crown section shape is straight-arc-arc double-cone crown section, using 4 kinds of cutting teeth, two diamond impregnated blocks with different matrix hardness and diamond concentration (the first impregnation Block 3, second impregnated block 4, see first impregnated block Figure 5 , See the second impregnation block Image 6 ), cylindrical PDC tooth 1 and circular wedge-shaped PDC tooth 2. The diamond particle size of the impregnated diamond blade substrate 10 is 46 mesh, the concentration is 80%, and the carcass hardness is 40 HRC. The first impregnat...

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Abstract

The invention relates to a cutting-grinding type impregnated diamond blocks and PDC clad sheet mixed drill bit which is a cutter wing type drill bit. Trapezoid cutter wings are adopted, the section shape of a crown part is a straight line-circular arc-circular arc type bipyramid crown part section, first impregnated blocks and second impregnated blocks are arranged alternately on three main cutterwings and two auxiliary cutter wings to achieve the capability that a shaft bottom can be completely covered, the diamond grit of the first impregnated blocks is 80 meshes, the concentration is 120%,and the alloy hardness is 60 HRC. The diamond grit of the second impregnated blocks is 60 meshes, the concentration is 100%, and the alloy hardness is 45 HRC. The included angle between every two adjacent main cutter wings is 100-140 degrees, the first main cutter wing has a super top structure, and one round wedge-shaped PDC tooth is arranged at the center of the drill bit, seven cylindrical PDCteeth are distributed around the round wedge-shaped PDC tooth. The cutting-grinding type impregnated diamond block and PDC clad sheet mixed drill bit solves the problem that existing PDC drill bits,roller bits and diamond drill bits are simplex to adapt to stratum.

Description

Technical field [0001] The invention relates to a drill bit for oil and natural gas drilling, in particular to a cutting-grinding type diamond and PDC composite sheet mixed drill bit with self-adaptive formation characteristics. Background technique [0002] Petroleum drilling uses a drill bit as a rock breaking tool. The matching degree between the drill bit and the formation determines the breaking efficiency and the life of the drill bit. A suitable drill bit can not only significantly increase the drilling speed, but also reduce the occurrence of downhole accidents. To achieve the purpose of high-speed, low-cost, and safe drilling. Especially in deep wells, the drilled stratum spans many geological ages, the lithology of the stratum changes greatly, and the drillability varies greatly in the vertical direction. Each trip is time-consuming and expensive. Therefore, deep well drilling puts higher requirements and challenges on the drill bit. For example, in the deep layers of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/43E21B10/55E21B10/567E21B10/60
CPCE21B10/43E21B10/55E21B10/5676E21B10/602
Inventor 张立刚岳欠杯刘照义王昶皓官兵李士斌
Owner CHENGDU DEEP DIAMOND BIT
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