Self-rotation pulse internal grinding drill bit for horizontal well

Abstract

The invention discloses a self-rotation pulse internal grinding drill bit for a horizontal well. Different from conventional PDC drill bits, the self-rotation pulse internal grinding drill bit is additionally provided with a pulse rotary jet grouting rock breaking device, a negative pressure swabbing device and a rock cuttings internal grinding device. The pulse rotary jet grouting rock breaking device comprises a resonant tube, a downward jetting runner, a self-rotation nozzle and a cutter wing. High-pressure pulse jet flow is generated by stimulating liquid resonance based on an organ pipe, so that hydraulic power is increased to improve rock breaking efficiency; rock breaking is achieved through shear stretching under forward jet flow of the self-rotation nozzle, and self-propelling force of the drill bit is provided through lateral jet flow; the negative pressure swabbing device comprises a reverse high-speed runner and a swabbing chamber, negative pressure is formed in the swabbing chamber by means of the high-speed property of reverse jet flow based on a jet pump, rock cuttings are swabbed to return to the top, and then chip hold effect is reduced; the rock cuttings internal grinding device comprises a mixing chamber, a throat portion, an accelerating chamber, an internal grinding chamber, an internal grinding body, a bypass and a diffusion chamber, rock cuttings are smashed through high-pressure acting force and water-wedge effect between particles and between particles and the internal grinding body, rock carrying is helped, and a cutting bed can be removed.

Description

technical field [0001] The invention belongs to the field of oil and gas well drilling, in particular to a self-rotating pulse internal grinding drill bit for a horizontal well. Background technique [0002] In the drilling of horizontal wells, cuttings are often accumulated due to unfavorable rock carrying and untimely cleaning of rocks, resulting in cuttings beds, which seriously restrict the ROP and drilling costs, and lead to complex drilling accidents such as pump holding, poor drilling, and even stuck drilling. occur. Conventional solutions are mostly to increase drilling speed, increase displacement, add lubricant, lift and lower the drilling tool in a short distance, and push the large-grain cuttings near the drill bit back to the bottom of the well for repeated crushing. Although there is a certain effect, but The ROP is reduced, and the cuttings bed of the horizontal well cannot be fundamentally removed. A very important reason for the generation of cuttings beds...

AI Technical Summary

Problems solved by technology

[0002] In the drilling of horizontal wells, cuttings are often accumulated due to unfavorable rock carrying and untimely cleaning of rocks, resulting in cuttings beds, which seriously restrict the ROP and drilling costs, resulting in complicated drilling accidents such as pump holding, poor drilling, and even drilling. occur

Conventional solutions are mostly to increase drilling speed, increase displacement, add lubricant, lift and lower the drilling tool in a short distance, and push the large-grained cuttings near the drill bit back to the bottom of the well for repeated crushing. Although there is a certain effect, but Reduced ROP, unable to fundamentally remove cuttings beds in horizontal wells

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