Automatic pressure compensating type differential-pressure ejecting continuous particle injecting device and method

The invention relates to an automatic pressure compensating type differential-pressure ejecting continuous particle injecting device and method. The device comprises a lifting particle filling system, a pressure compensating system, a dual-tank injection system, an anti-blocking mixing system and a circuit control system; the device belongs to the technical field of petroleum drilling engineering and is used for continuous injection of particles in particle impact drilling; the pressure compensating system is capable of pre-increasing the pressure in particle injection tanks to the working pressure; the dual-tank injection system is composed of alternately usable two tanks connected in parallel to guarantee the continuous injection of the particles; the anti-blocking mixing system is capable of injecting the particles into a mixing chamber controllably and adjustably while avoiding particle blockage, so that the particles can be thoroughly mixed with a drilling fluid. The automatic pressure compensating type differential-pressure ejecting continuous particle injecting device is capable of realizing the continuous injection of the particles in the particle impact drilling and capable of working continuously for a long time; as a result, the controllable and adjustable particle concentration is ensured and the particle blockage accident is avoided; besides, the particles are mixed evenly with the drilling fluid; the device is reasonable and compact in structure, safe and reliable in use, and capable of greatly reducing the drilling period.