PROCESS OF HYDRAULIC FRACTURING OF FORMATIONS IN WELLS Russian patent published in 2003 - IPC

FIELD: oil industry. SUBSTANCE: invention is related to intensification of inflows of stratal fluids thanks to hydraulic fracturing of productive formations, to fracturing of pools in injection wells and to other well operations where formation of high pulse pressures is required. This process ensures compensated water hammer and prolonged time of water hammer. In compliance with invention charging string of pipes is sunk into zone of hydraulic fracturing. String clearance is sealed. Breakdown agent is pumped under pressure. Hydraulic fracturing of rock is executed. Propping agent is fed. Well fluid is forced from internal space of charging string and its clearance with gas before injection of breakdown agent. Then separating plug is placed into charging string. During process of injection of breakdown agent into charging string additional agent is pumped into string clearance with flow rate established from mathematical expression. In this case string clearance in well is sealed across well-head after filling of string clearance with additional agent and termination of its eruption during injection of breakdown agent. Propping agent is fed into formation together with breakdown agent. EFFECT: compensated water hammer and prolonged time of water hammer. 4 cl, 4 dwg, 1 tbl