METHOD OF PROPPING OF ROOF OF BOTTOMHOLE FORMATION ZONE Russian patent published in 2013 - IPC E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: sand bridge is installed in a gross interval of carrier bed. A flushing fluid is injected into a sealed well with fixation of injection pressure and volume of the injected flushing fluid, with simultaneous building of a dependence curve. According to the schedule the pressure of "leakage" start is decided in the deviation point. The excess pressure is relieved with fixation of the volume of the released well flushing fluid, and the well head is unsealed. A cement bridge is installed by means of pushing of a cement mortar in the volume determined from the inequation, with volume flow rate calculated in accordance with the formula and simultaneous lifting of a hydraulic monitor from the carrier bed roof with entry into an operating string, with the speed calculated in accordance with the dependence. A sleeve of cement mortar is left in the string in the volume required to fill the vault part of the damage cavern. The flushing fluid is injected into the well in the volume that does not exceed the volume of the cement mortar sleeve or before achievement of the "leakage" start pressure. Hardening of the cement mortar is expected with pressure maintenance, afterwards the cement and the sand bridges are drilled.

EFFECT: increased quality of roof propping in a bottomhole formation zone in wells with open design of a bottomhole, when a vault part of a damage cavern spreads below a bottom of an operating string.

1 cl, 2 dwg