Electric pulse rock-breaking dill bit and experimental facility thereof

Abstract

The invention discloses an electric pulse rock-breaking dill bit and an experimental facility thereof. The electric pulse rock-breaking experimental facility comprises a confining pressure pumping station, a pulsed power supply, a PLC control device, a confining pressure cylinder horizontal-moving device, a water inlet and outlet pump, a confining pressure cylinder assembly, a high-pressure electric pulse rock-breaking drill bit body, and the like. The high-voltage pulsed power supply is used for transmitting high-voltage pulse electricity from a high voltage electrode to a low voltage electrode through a cable, the high-voltage pulse electricity meeting certain conditions breaks through rocks firstly to generate a discharge channel, a plasma channel expands when heated, when the pressureexceeds the stress intensity of the rocks, and the rocks are broken and the high-voltage pulse discharge drilling is realized. The high-pressure electric pulse rock-breaking experimental facility cansimulate the high voltage environment of deep drilling in the earth, electric pulse drilling experiments carried out on high temperature and high pressure deep wells and ultra-deep wells are more close to actual drilling environments, experimental studies on the geometrical shape, distribution, spacing and electrode materials of electrodes of high-voltage electric pulse rock-breaking drill bit inthe deep wells and the ultra-deep wells can be realized, and the high-voltage pulse discharge drilling has broad development prospects.

Description

Technical field [0001] The invention relates to the field of drilling, and more specifically, to an electric pulse rock breaking drill bit and an experimental device thereof. Background technique [0002] The main function of the electric pulse rock-breaking bit is to supply the high-voltage electric pulse rock-breaking bit through the high-voltage short pulse power supply, which generates a discharge channel in the rock body, so that the rock body can be broken down, and the rock is broken quickly, efficiently and green. The method is suitable for rock breaking drilling in deep wells above 5km. Compared with ordinary mechanical rotary drilling, it has the characteristics of low cost and high borehole wall quality. The electric pulse rock breaking experiment device, the main function of which is to achieve the right through the electric pulse breaking experiment. Research on electrode geometry, distribution, spacing and electrode materials, electric pulse rock breaking bit and el...

AI Technical Summary

Problems solved by technology

[0004] The use of mechanical rotary drilling to drill high-temperature and high-pressure wells has the following problems: At present, rock-breaking tools are limited by the increase in deep hole temperature and driving power, and their range of use and performance are affected; the geological conditions for drilling high-temperature and high-pressure deep wells and ultra-deep wells are complex. It may lead to adverse consequences such as drilling accidents and reduced drilling efficiency; under different temperature and pressure conditions in deep holes, the physical and mechanical properties of rocks will change, resulting in changes in the cutting performance of cutting tools under high ground stress and high temperature; As the drilling depth increases, the well inclination will generally also increase. After the well inclination increases, it will bring many difficulties to the drilling construction, and the construction will be difficult. The traditional rotary drilling method for high-temperature and high-pressure wells has low drilling efficiency, Due to the high cost of drilling and the inability to guarantee the quality of the wellbore, it is necessary to rely on new rock breaking technology

Scholars at home and abroad have conducted extensive research on high-voltage electric pulse rock breaking, mainly researching high-voltage electric pulse rock-breaking transmission cables, high-voltage electric pulse power supplies, and spark switches, etc., and achieved good rock-breaking effects. Electric pulse rock-breaking drill bits, drill bit electrode materials, geometric shapes, distribution and spacing of electrodes, etc. are less studied. At present, the development of high-voltage electric pulse rock-breaking drill bits has become the main research technology that limits the development of high-voltage electric pulse rock-breaking technology.

Images