METHOD AND DEVICE TO CONTROL FORMATION PRESSURE KEEPING SYSTEM Russian patent published in 2006 - IPC E21B43/20 

FIELD: oil production industry, particularly to increase oil recovery by secondary method.

SUBSTANCE: method for pressure keeping in cyclic regime with the use of main high-capacity pump station and additional low-capacity pump station involves connecting the pump stations to delivery line through remote-controlled equipment of injection wells for a certain time necessary for fulfill pumping operation without flow throttling; supplying working agent of main pump station into all injection wells during common pumping cycle; stopping working agent injection in injection wells having high injectivity and disconnecting main pump station from delivery line; linking additional pump station to delivery line and completing working agent pumping in injection wells having lesser injectivity; regulating pumping operation performed by additional pump station with taking into consideration necessary working agent volume to be injected in each injection well to operate additional pump station at maximal performance factor; disconnecting injection wells after pumping operation termination from delivery line in injectivity decreasing order. The additional low-capacity pump station is displacement pump. Device for above method realization comprises supply pipeline, main high-capacity pump station and additional low-capacity pump station of displacement type connected to supply pipeline through shutoff fittings and to water-distribution unit through supply water pipe. Water-distribution unit is connected to shutoff and regulation fittings of injection wells by means of delivery line through shutoff means. Pressure and liquid volume sensors are installed at each injection well head. The sensors are linked with common controller via data transmission channel. Controller outputs are connected to voltage frequency converter input and to input of shutoff and regulation fitting control unit. Outputs of the control unit are connected with control inputs of shutoff and regulation fittings and shutoff fittings. Voltage frequency converter output is linked to additional pump station inlet.

EFFECT: decreased water content of oil deposit and reduced power inputs.

3 cl, 3 dwg