PROCESS OF ACTION ON WEAKLY PENETRABLE CRACKED COLLECTOR WITH ANOMALOUSLY HIGH SEAM PRESSURE Russian patent published in 2002 - IPC

FIELD: oil and gas industry. SUBSTANCE: invention is related to completion of oil and gas wells, specifically, to development of porous-cracked collectors with anomalously high seam pressure. Process includes cyclic formation of excessive pressure of same value in hole clearance and its subsequent decrease to create depression. Pressure is decreased through calibrated hole to constant value in each cycle in several series. It is carried out to determine effective value of decrease of excessive pressure at which discharge of well is largest. Hole and pipe clearances are filled with fluid of same composition. Gas is pumped into pipe clearance with observation of equality of face and seam pressures. Pipe clearance is shut off and after formation of excessive pressure it is dropped through hole clearance. Series of actions is continued till seam fluid or filtrate of drilling fluid appears at well-head. EFFECT: improved accuracy of determination of value of decrease of excessive pressure.