Runner cross central whirl spraying negative pressure pulse drill bit

A cross-flow channel technology, applied in the field of oil and gas well drilling, can solve the problems of low mechanical penetration rate, affecting drilling efficiency, limited improvement of mechanical penetration rate, etc., and achieve the effect of low power consumption, small friction resistance and stable operation

Inactive Publication Date: 2016-12-21
SINOPEC CHONGQING FULING SHALE GAS EXPLORATION & DEV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A very common problem in conventional PDC drilling is low ROP, which seriously affects drilling efficiency
Conventional solutions are mostly to

Method used

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  • Runner cross central whirl spraying negative pressure pulse drill bit
  • Runner cross central whirl spraying negative pressure pulse drill bit
  • Runner cross central whirl spraying negative pressure pulse drill bit

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Embodiment Construction

[0036] Such as figure 1 As shown in the figure, a negative pressure pulse drill bit used for flow channel cross type center jet spraying, including: 1. Drilling fluid flow channel, 2. Drill body, 3. Chip return cavity, 4. Diversion area, 5. Mixing cavity, 6 . Negative pressure pumping chamber, 7. Side branch channel of downspout, 8. Center self-rotating flowway of downspray, 9. Feed cavity, 10. Resonant cavity, 11. Outlet of resonant tube, 12. Throat, 13. Reverse To the high-speed runner, 14, the blade, and 15 self-rotating nozzles. The self-rotating nozzle includes: 16. a self-rotating central axis body, 17. a side nozzle, 18. a nozzle shell, 19. a self-rotating body, and 20. a forward nozzle. It is mainly divided into three parts: the pulse generation part, the rock breaking part of the central rotary spraying and the negative pressure swabbing upward return part.

[0037] The pulse generation part includes a drilling fluid flow channel 1, a feed cavity 9, a resonant cavit...

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Abstract

The invention discloses a runner cross central whirl spraying negative pressure pulse drill bit. The drill bit is characterized by comprising a pulse jet generating device, a central whirl spraying rock breaking device and a negative-pressure swabbing device, wherein the pulse jet generating device comprises a drilling fluid runner, a feeding cavity, a resonant cavity, a resonant pipe outlet and a shunt area, and generates pulse jet by exciting fluid resonance based on an organ pipe, thereby improving the rock breaking efficiency; the central whirl spraying rock breaking device comprises a central self-rotating nozzle, a spray-down bypass runner, a spray-down central self-rotating runner and a blade, rotates to realize forward jet shear tensile rock breaking based on high-pressure water jet, and performs lateral jet to provide self-feeding force for the drill bit, so that the rock breaking and rock cleaning efficiency is improved in combination with the spray-down bypass runner; the negative-pressure swabbing device comprises a reverse high-speed runner, a swabbing cavity, a mixing cavity, a throat and a chip return cavity, negative pressure is formed in the swabbing cavity by means of the high-speed characteristics of reverse fluid based on a jet pump, and rock chips are swabbed, so that the chip hold down effect is reduced.

Description

technical field [0001] The invention belongs to the field of oil and gas well drilling, and specifically designs a flow channel cross type central swirling negative pressure pulse drill bit. Background technique [0002] A very common problem in conventional PDC drilling is low ROP, which seriously affects drilling efficiency. Conventional solutions are mostly to increase the displacement and improve the performance of the drilling fluid. Although some effects have been achieved, the increase in ROP is limited. A very important factor affecting ROP is the pinch effect. How to reduce or even eliminate the pinch effect has always been the focus of drilling workers and theoretical researchers. [0003] ]Jet pumps have been used on a large scale in oil production and cementing. The negative pressure-sucking theory based on jet pumps has a good performance in oil production. The relevant theory can be applied to the design of new drill bits to improve the cleaning efficiency of ...

Claims

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Application Information

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IPC IPC(8): E21B10/60E21B10/61
CPCE21B10/60E21B10/61
Inventor 高德利魏征刘永升
Owner SINOPEC CHONGQING FULING SHALE GAS EXPLORATION & DEV
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