Self-advancing cuttings abrasive direct-rotation mixed-jet drill bit

Abstract

The invention relates to a self-propelled rock debris grinding material straight-spinning jet mixing flow drill bit. The drill bit comprises a backward nozzle, a straight-spinning jet flow nozzle, a rock debris grinding material funnel, a forward nozzle, stabilizing supports and the like. According to the basic working principle of the drill bit, when jet flow passes through the drill bit, one part of the jet flow is jetted through the forward nozzle to provide self-propelled force for the drill bit and to broaden holes, the other part of the jet flow is jetted at high speed through the straight-spinning jet flow nozzle of the drill bit, the jet flow pumping effect is generated in an interval section, rock debris grinding materials sucked into the rock debris grinding material funnel enter the forward nozzle, eventually straight-spinning jet mixing flow of the rock debris grinding materials is formed to jet and break rock, and therefore rock breaking efficiency is improved, broken rock debris is discharged through an annulus along with drilling fluid, part of the rock debris enters the rock debris grinding material funnel due to the gravity effect and the jet flow pumping effect and supplies grinding materials to grinding material jet flow rock breaking. According to the drill bit, rock breaking efficiency of a radial horizontal well with the ultra-short radius can be effectively improved, and a well track can be effectively controlled.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a self-propelled cuttings abrasive direct-rotation mixed jet drill bit. Background technique [0002] With the deepening of exploration and development of oil and gas resources, a high-efficiency new technology for the development of low-abundance oil and gas resources, the reconstruction of old wells in oilfields, the tapping of reservoir potential, and the stabilization and production increase of ultra-short radius sidetracking horizontal well drilling technology (also known as diameter drilling technology) has emerged. Horizontal well drilling technology), this technology refers to the use of coiled tubing and supporting drill bits in a vertical wellbore to drill one or more horizontal slimholes radially distributed. The technology uses the erosive energy of ultra-high-pressure water jets to break rock downhole while providing self-advancing capabilities to the drill bi...

AI Technical Summary

Problems solved by technology

However, the existing technology and supporting tools still have the following problems to be solved urgently: 1) The rock-breaking drilling efficiency of water jet is low; 2) The structure of the drill bit or nozzle is complex and easy to fail; ; 4) The wellbore is irregular and the wellbore trajectory is difficult to control

However, due to the limitation of ultra-short-radius radial horizontal wells and economical considerations, it is unreasonable to add abrasives circularly for abrasive jet rock breaking

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