PDCdrill bit for rock breaking by thermal spalling

A drill bit and rock-breaking technology, applied in the field of PDC drill bits for thermal peeling and rock-breaking, can solve the problems of PDC bit failure and poor drilling effect, and achieve the goal of improving rock-breaking efficiency, prolonging service life, and reducing the difficulty of penetrating into formations. Effect

Inactive Publication Date: 2019-02-22
刘伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These complex formation conditions can easily lead to abnormal failure of the PDC bit, or make the drilling effect of the ...

Method used

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  • PDCdrill bit for rock breaking by thermal spalling
  • PDCdrill bit for rock breaking by thermal spalling
  • PDCdrill bit for rock breaking by thermal spalling

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Embodiment Construction

[0025] The following non-limiting examples illustrate the invention.

[0026] Such as figure 1 , 2 , shown in 3, a kind of PDC drill bit of thermal spalling and broken rock, comprises drill bit body 1, fixed blade 2, is provided with PDC tooth 21, water hole or nozzle 3 on the fixed blade, is characterized in that: the cutter of drill bit At least one electromagnetic wave generator 5 is arranged on the wing, and the electromagnetic wave generator includes a DC power supply 51, an RLC circuit 52, a high-frequency amplifier 53, and a transmitting antenna 54, and a central water hole 4 is arranged at the core of the drill bit, and the drill bit is a steel body drill bit.

[0027] Preferably, the frequency of the electromagnetic wave is 3GHz-300GHz.

[0028] Preferably, the temperature of the rock heated by electromagnetic waves is controlled at 300°C-500°C.

[0029] Preferably, the depth of the electromagnetic wave penetrating the rock is controlled at 20cm-30cm.

[0030] The...

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Abstract

The invention provides a PDCdrill bit for rock breaking by thermal spalling. The PDC bit comprises a drill bit body and fixed blades, and PDC teeth, water holes or nozzles are formed in the fixed blades; the PDC drill bit is characterized in that one or more electromagnetic wave generators are arranged on the blades of the drill bit, each electromagnetic wave generator comprises a direct current power supply, an RLC circuit, a high-frequency amplifier and a transmitting antenna, a central water hole is formed in the center of the drill bit, and the drill bit is a steel body bit. In this way, arock is irradiated and heated by electromagnetic waves, and broken by thermal spalling, under the high temperature state, the rock is suddenly cooled when being exposed to water through the central water hole, since the temperature inside the rock changes rapidly, a temperature gradient is formed inside the rock, and the thermal fracture or thermal impact phenomenon occurs in the rock and causesdeterioration of various mechanical properties of the rock; and the drill bit uses two modes of thermal spalling and scraping and cutting of the PDC teeth to break the rock in a coupled mode, thus therock breaking efficiency of the drill bit is improved, the difficulty of the PDC teeth entering the formation can be lowered, the service life of the PDC teeth is prolonged, and comprehensive performance of the drill bit is improved.

Description

technical field [0001] The invention belongs to the fields of oil and gas drilling engineering, mining engineering, building foundation engineering construction, geological drilling, tunnel engineering, hydrology and non-excavation and other technical equipment fields, and specifically relates to a PDC drill bit for thermal exfoliation and rock breaking. Background technique [0002] PDC bits rely on high-hardness, wear-resistant, self-sharpening polycrystalline diamond compacts (referred to as PDC teeth or cutting teeth) as cutting elements to shear and break rocks. PDC drill bits have high mechanical penetration rate, long service life and low drilling cost in soft to medium hard formations, so they are widely used in the drilling of oil and gas wells. [0003] In oil and gas drilling engineering, the geological conditions of the formation are often very complex. Under the pressure of the overlying formation and high-density drilling fluid, the mud shale and argillaceous s...

Claims

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Application Information

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IPC IPC(8): E21B7/14E21B10/46E21B10/60E21B12/00
CPCE21B7/14E21B10/46E21B10/60E21B12/00
Inventor 刘伟
Owner 刘伟
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