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Cutting-grinding type impregnated diamond block and pdc composite disc 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, and avoid early collapse and avoid Stress concentration, avoiding the effect of anti-coring

Active Publication Date: 2019-07-30
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

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  • Cutting-grinding type impregnated diamond block and pdc composite disc mixed drill bit
  • Cutting-grinding type impregnated diamond block and pdc composite disc mixed drill bit
  • Cutting-grinding type impregnated diamond block and pdc composite disc mixed drill bit

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the present invention will be further described:

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

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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 used for oil and natural gas drilling, in particular to a cutting-grinding drill bit mixed with diamond and PDC composite sheets with self-adaptive formation characteristics. Background technique [0002] Oil drilling uses the drill bit as a rock-breaking tool. The matching degree between the drill bit and the formation determines the rock-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 stratum to be drilled spans many geological ages, the lithology of the stratum varies greatly, and the vertical difference in drillability is large. Every trip is time-consuming and expensive. Therefore, deep well drilling puts forward higher requirements and challenges for drill bits. For example, in the ...

Claims

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Application Information

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Patent Type & Authority Patents(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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