WELL OPERATION METHOD Russian patent published in 2008 - IPC E21B43/14 

FIELD: oil industry, particularly operation of well penetrating two reservoirs.

SUBSTANCE: method involves lowering two pipe strings in well; separating upper reservoir from lower one with packer; injecting working agent in lower reservoir via the first pipe string provided with packer and producing liquid from upper reservoir via the second pipe string provided with pump. Pipe string for liquid extraction has pump with delivery enough for liquid taking from both reservoirs. Well head has connections including pipes, locking members and check valves to provide periodic connection of the first pipe string with working agent source for working agent supply in lower reservoir, with discharge line and with hole annuity of the well. Working agent injection via the first pipe string into lower reservoir is periodically stopped and the first pipe string is communicated with discharge line. Liquid is poured out from lower reservoir into discharge line and the first string is communicated with working agent source for working agent injection in lower reservoir. Oil is continuously taken via the second string by means of pump. Pump delivery is changed to take liquid only from upper reservoir or from both reservoirs simultaneously. After liquid discharge from lower reservoir the first string is communicated with hole annuity, pump delivery is increased and liquid is pumped out from both reservoirs simultaneously. As lower pool productivity is reduced the first string is isolated from well hole annuity, pump delivery is decreased and liquid is pumped out from upper pool via the second string along with working agent injection in lower reservoir via the first string. After stoppage of working agent supply into lower reservoir via the first string technological time-delay is performed to lower water cones and to decrease oil inflow to well.

EFFECT: increased completeness of oil taking from reservoirs.

3 cl, 1 ex, 1 dwg