METHOD FOR DETERMINING WATER CONTENT OF BOREHOLE OIL Russian patent published in 2017 - IPC E21B43/34 E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: method of determining water content of borehole oil consists in fixation of well product in a reservoir with constant cross-section along its height, holding well product in the reservoir to provide gravitational separation into oil and water, and determining water content of well product by the height of water portion relative to the entire height of liquid in the reservoir. A check valve is installed above the deep well pump. After the operation of the deep well pump is stopped, associated oil gas is discharged from the tubing string with pressure reduction down to atmospheric value. The static level of liquid in the tubing string is measured several times until it's the value is constant and the volume of liquid in the tubing string is determined. By putting the deep well pump in the operation, well product of known volume is transferred from the tubing string into a reservoir located on the earth surface. The pressure in the pipeline line is maintained at a level equal to pressure at the well outlet line during its normal operation.

EFFECT: providing better separation of well product into oil and water without stopping the operation of the deep well pump for a long time.

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