METHOD FOR DEVELOPMENT OF OIL POOL (VERSIONS) Russian patent published in 1995 - IPC

FIELD: oil producing industry. SUBSTANCE: method for development of oil pool includes well spacing, injection of working medium through injection wells and withdrawal of oil from producing wells. Well spacing and placing them on production are effected successively. Well rows are spaced over pool width beginning from its central part. During the first period, wells are operated as producing ones with bottom-hole pressure equalling, at least 75% from oil saturation pressure to water cutting of well production which numerically equals the value of rated oil recovery factor divided by rated formation sweep efficiency. During the second period, wells are operated as injection ones. Next extreme wells in adjacent rows are equally spaced from formed flood front and from outer oil pool outline and operated in two periods. Method also provides for operation by employing technology with which wells during first period are operated as producing ones, first, with bottom-hole pressure amounting, at least, to 75% from oil saturation pressure to water cutting of well production numerically equal to value of rated oil recovery, and then, with bottom-hole pressure less than 75% of oil saturation pressure. EFFECT: higher efficiency. 2 cl