METHOD FOR OIL PRODUCTION WITH THE USE OF MARGINAL WELLS Russian patent published in 2007 - IPC E21B43/20 

FIELD: oil production industry, particularly enhanced recovery methods for obtaining hydrocarbons by oil displacing by water.

SUBSTANCE: method involves producing oil by means of complex pumping system including producing borehole pumps with electric motors and reservoir pressure maintaining pumps provided with common pump operation and pump output control system. First of all functional relation between amount of current change in electric motor circuit and volume of produced reservoir fluid at a given electric motor shaft speed is experimentally determined for each separate producing borehole pump in corresponding producing well. Amount of reservoir fluid to be produced by borehole pumps is automatically optimized in correspondence with change of reservoir fluid inflow in borehole pumps by continuous current change in electric circuit of corresponding producing borehole pump and by proportionate increase of electric motor shaft speed as current increases or proportionate decrease of electric motor shaft speed as current decreases. At the same time reservoir pressure maintaining pump output is regulated in dependence of formation fluid amount produced by borehole pumps increase.

EFFECT: provision of continuous optimization of oil extraction from marginal wells.

5 cl, 1 ex, 3 dwg