PROCEDURE FOR OPERATION OF HIGH WATER FLOODED OIL WELL Russian patent published in 2010 - IPC E21B43/00 

FIELD: oil and gas production.

SUBSTANCE: according to the procedure oil is withdrawn separately from pay to day surface. Preliminary, production in the well is gravitationally separated into oil and water. Separated water is pumped into a take-up bed. A pump is positioned above a packer on a pipe string, the pump is communicated through its input with under-packer space, while with its output it is communicated with above-packer space through radial apertures in the pipe string. Pipes of smaller diametre are arranged on the condition of gravitational separation of production into oil and water and are installed under radial apertures. Separated oil is lifted through tube space and the pipe string; its consumption is controlled at a wellhead; while controlled volume of water is pumped via tube space into the take-up bed due to pressure of liquid column in the well and excess pressure created with the pump. Interval of the take-up bed is communicated with wellhead measuring instrumentation via a separate tube; on base of instrumentation indications quality of water pumped into the take-up bed is controlled. Separation of emulsion into oil and water can be performed with a separator before pumping into tube space.

EFFECT: raised efficiency of operation due to withdrawing oil with minimal presence of water and to pumping major part of water into incumbent take-up bed, also due to control over amount and quality of water.

2 cl, 2 dwg