DEVICE FOR EXPOSING AND SIMULTANEOUS-SEPARATE OPERATION OF TWO GAS FORMATIONS Russian patent published in 1994 - IPC

FIELD: mining. SUBSTANCE: continuous maintenance of high formation pressure of condensate-saturated horizon is effected by bypassing of dry gas to it from high-pressure formation in one producing well. Device consists of body included in string assembly and gravel-packed casing liner, bypass sleeve with circulating holes and spring-loaded valve installed on its outer cylinder. Installed inside sleeve is spring-loaded bush and plug locked by ball lock. When branch pipe is installed in sleeve, axial channel is freed of plug and its bypass holes open and tight joint of tubing with casing liner is effected. Such technical solution allows gas bypass from high-pressure to low-pressure formations and their combined-separate operation, and alternating killing of formations with solution of respective density. Installation of one more branch pipe provides for tight isolation of formations by closing with locking bush of sleeve circulating holes. This makes it possible to perform periodic withdrawal of fluid from gas-saturated formation for restoring its reservoir properties. EFFECT: higher condensate recovery and field operation efficiency. 2 cl, 7 dwg