METHOD FOR MAINTAINING FORMATION PRESSURE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2014 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention includes pumping of cluster pumping station fluid equipped with inlet and discharge water conduit through comb unit and injection wells into the formation in cyclic mode with regular stop of cluster pumping station operation. In the period of low outside temperatures at cluster pumping station stop there performed is a cluster controller adjusted by flow direction and volume fluid discharge from injection wells with close reservoir properties through discharge water conduit and bypass line into inlet water conduit or process tank. Fluid discharge volume is made with provision of multiple replacement of water in wellhead zones of injection wells. Device includes cluster pump station with inlet and discharge water conduits with flow metre, comb unit, connected to discharge water conduit of cluster pump station and water conduits of injection wells fitted with shut-off valves, and cluster controller connected to shut-off valves control units. Note that inlet water conduit and discharge water conduit between flow metre and cluster pumping station are connected via bypass line to adjusted by hydraulic resistance, equipped with process tank and shut-off-control valves made in the form of adjustable valve gates mounted capable of opening and closing of cross-flows from bypass line into inlet water conduit or process tank, as well as for closing bypass line at switching on, cluster pumping station. Note that the flow metre is connected to the communication channel about flow direction and fluid volume with cluster controller.

EFFECT: reduction of material costs for water conduit servicing and repair in case of danger of their freezing and plugs formation.

2 cl, 1 tbl, 1 ex, 1 dwg