WELL STIMULATION USING IMPROVED PULSE GASDYNAMIC TECHNIQUE

In recent years the hydrocarbon reservoirs of low permeability have been discovered and developed in Russia and in the West. Much attention is paid worldwide to the enhanced oil/gas recovery from such reservoirs. The reservoir of low permeability were assumed earlier before as non payable ones but nowadays they are considered as the excess reserves. The rehabilitation of the bottom hole rock permeability reduced in the course of well conditioning and workover is a serious consideration. One of the promising methods of well stimulation is a productive layers wave attack [1, 2]. According to the conventional understanding of the physics of wave effect on the rock permeability one can identify two groups of phenomena. The first group includes the events of constant wave effect on the porous medium, which disappears immediately or shortly once the attack is over. These events are caused by elastic effect on fluid rheologic characteristics. It is apparent, that such effect presents in the field if the operation of the wave source corresponds to the well operation. The wave source is a vibrowave emitter. The second group includes the events with an aftereffect, i.e. the rock permeability is being affected for a long period after the attack is over. Such attacks include the cleaning off the contaminant from the pore space, irreversible fracture propagation aimed to increase the roc