Ultrasonic vibration steel particle jet flow impact auxiliary drilling system and method

Abstract

The invention discloses an ultrasonic vibration steel particle jet flow impact auxiliary drilling system and method, and belongs to the technical field of underground engineering well drilling. The system comprises a drill rod, a drilling platform, an ultrasonic vibration drill bit, a slurry steel particle stirring and mixing device, a high-pressure pump, a valve plate type blowout preventer, a rotary storage tank type particle recovery system and a full-automatic tank type particle continuous injection system; the ultrasonic vibration drill bit is in threaded connection with the drill rod; the slurry steel particle stirring and mixing device, the high-pressure pump, the valve plate type blowout preventer, the rotary storage tank type particle recovery system and the full-automatic tank type particle continuous injection system are connected through pipelines. According to the method, the ultrasonic vibration steel particle jet impact auxiliary drilling system is adopted for drilling, high-speed mixed fluid of steel particles and slurry is firstly utilized for generating primary damage to the rock, then ultrasonic vibration directly acts on the steel particles, the steel particles generate high-amplitude high-frequency impact effect, secondary impact damage is conducted on the rock, and the rock is subjected to secondary impact damage. And the rock is further weakened, so that the hard rock drilling rate is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of underground engineering drilling, and in particular relates to an ultrasonic-vibration steel particle jet impact-assisted drilling system and method. Background technique [0002] According to the National Resource Potential Evaluation Report (2014), the predicted resources of mineral resources shallower than 2,000 meters in my country are huge, and the predicted resources of important mineral resources are more than twice the proven resources. Therefore, the potential of deep mineral resources in my country is still huge. Asking for resources from the deep can further meet the high demand for energy and resources brought about by the continuous development of society and population growth. On the other hand, in order to explore the law of environmental temperature changes, reveal the material composition of the deep earth, and explore the evolution process of the earth, etc., the scientific research commu...

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Problems solved by technology

[0006] (1) The degree of accelerating the rate of hard rock fragmentation is still limited, and the time for the rock to be significantly weakened exceeds 2 minutes. Therefore, there is a lagging shortcoming after combining with conventional hard rock drilling technology (see the dissertation "Influence of ultrasonic excitation on rock fragmentation" for details) Factor Experimental Research”);

[0007] (2) The existing ultrasonic vibration drilling tools (see patent literature No. 201610051518.7, 201510078522.8, 201420090605.X for details) place the ultrasonic vibration devices in the drill bit body without direct contact with the rock. According to the law of conservation of kinetic energy, the ultrasonic vibration is transmitted first As far as the carcass is concerned, due to the large mass of the carcass, the vibration amplitude generated by the carcass will be significantly reduced, which will further weaken the effect of ultrasonic vibration on rock breaking

[0010] The size of the fluid outlet of the jet element of the steel particle jet impact technology is small (the application of the steel abrasive jet in petroleum engineering), so the size of the crushing hole generated in the rock at the bottom of the hole is small (about 1 cm in diameter, see the academic paper "Particles" for details). Numerical simulation and experimental verification of rock damage field under water jet impact"), while for deep high-stress conditions, small-sized crushing holes have little effect on weakening the overall strength of the rock, especially when the drilling hole diameter is large, although the hole in the center of the hole Broken holes appear, but the strength of the rock where the drill bit cutter contacts is still high, so the cutting rate is low, and there is a time difference between the drill bit cutting and the jet impact, resulting in low energy utilization (see the academic paper "Numerical simulation and experimental verification for details") of the rock damage field under particle water jetimpacting"), the steel particle jet impact effect is limited

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