Abstract: The method consists in generating periodically shock waves by initiating the electric discharge in a fluid filling in the well between the electrodes. To initiate the electric discharge, a current-conducting fluid comprising a dielectric fluid and a current-conducting powder material is fed additionally between the electrodes. The device for carrying the method into effect comprises a discharge chamber (5) with positive and negative a system of feeding an initials between the electrodes (3, 4), a system of feeding an initiator between the electrodes (3, 4), electrodes (3, 4), and a surge current generator (2). The device has at least one metering valve (12) with a drive (13) and an additional chamber (9) filled in with a dielectric fluid. A duct (10) having a pressure spool valve (11) is provided in the wall of the additional chamber (9). Inlet and outlet holes (7, 6) are provided in the wall of the discharge chamber (5).

Abstract: A downhole thermoacoustic device comprises a heater with a terminal chamber, connected to a source or radiator of acoustic oscillation, including a hollow housing having mounted therein a longitudinal shaft carrying coils with cores in the form of a plurality of flat rings of a magnetostrictive material, operable as the active elements adapted to generate acoustic oscillation. Accommodated intermediate the coils is a member for focusing the acoustic field, in the form of a sleeve, while the longitudinal shaft carries a tube-shaped reflector of acoustic oscillation internally of the core of each coil. The top and bottom portions of the hollow housing of the radiator of acoustic oscillation have mounted therein damping elements including sleeves of a resilient material, while a heat-insulating member including a sleeve with a fluted surface is provided intermediate the terminal chamber of the heater and the hollow housing of the radiator.

Abstract: A thermal-mining method of oil production is effected by digging a combination of underground workings and at least one working tunnel and by drilling injection and producing wells from said working tunnel. Then a heat carrier is forced into the oil-bearing bed for heating it to a temperature sufficient for the oil to acquire the necessary fluidity. The heat carrier is forced into the oil-bearing bed through injection wells at time intervals t.sub.1 found from an appropriate relation. The oil is withdrawn from the oil-bearing bed through the producing wells at time intervals t.sub.3 in which the time interval t.sub.1 of heat carrier injection into the injection wells is divisible by the time interval t.sub.3 of oil withdrawal from the producing wells, the multiplicity factor being equal to n=(t.sub.1 /t.sub.3).gtoreq.60.