METHOD FOR CLUSTER PUMPING OF WATER INTO BED UNDER NEGATIVE TEMPERATURES Russian patent published in 2013 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: method includes water pumping with a cluster pump station via a valve manifold with gate valves along water conduits, through gate valves installed in a wellhead zone of injection wells, into injection wells under different working pressures with stops of the cluster pump station. Previously donor wells are detected, which pour water as pumping is stopped, and wells that receive water. For the period of shutdown of the cluster pump station the gate valves are closed at the valve manifold and/or in the wellhead zone of injection wells, and valves are periodically opened as temperature is achieved in the water conduit, which is 1-4°C higher than the temperature of freezing of the pumped water. Water in the water conduit of the wellhead zone of the injection well is substituted as water flows from donor wells into other wells in amount from one to three volumes of the water conduit for every opening of the gate valve. Before scheduled shutdown of the pump of the cluster pump station pumping is done only into detected injection donor wells.

EFFECT: prevention of water conduit freezing in a wellhead zone and wellhead of injection wells under negative temperatures for the period of shutdown of a cluster pump station pump due to water substitution in a water conduit.

2 cl, 1 tbl, 2 dwg