METHOD FOR INCREASING PRODUCTIVITY OF WELLS Russian patent published in 1998 - IPC

FIELD: oil and gas production industry. SUBSTANCE: according to method, bottom-hole zone of bed is treated by hydrocarbon solvent which is produced directly in bottom-hole zone of bed. For this purpose, level of liquid in producing well is lowered down to interval of perforations. Zone of well is vacuumized to pressure of 13.3-1.33 kPa and this pressure is maintained during 30-40 min. Then, pressure is sharply increased to atmospheric level. This process is repeated 2-3 times until liquid output is increased. Aforesaid method allows for increasing productivity of well due to enlarged recovery of liquid and reduction of expenses for buying and delivery of reagents and also due to elimination of operations connected with raising and lowering of underground equipment. EFFECT: higher efficiency.