PROCESS OF OPERATION OF INJECTION WELLS Russian patent published in 2002 - IPC

FIELD: development of oil and gas fields. SUBSTANCE: proposed process can be used to maintain pressure in productive pools. It provides for installation of tubing string with packer in well cased by production string to separate interstring ring space. Forcing working substance is pumped through tubing string. Non-return valve is positioned in packer or tubing string to communicate interstring ring space with space of tubing string. Well is brought to stop when pressure in separated interstring space builds up to value critical for operation of production string and pressure in tubing string is reduced. Pressure in interstring ring space is dumped into tubing string. After it well is again brought into operation. EFFECT: exclusion of water leakage to rock surrounding well through leaks of string. 1 dwg