METHOD OF SUPPLYING AN ARPD SOLVENT INTO A WELL Russian patent published in 2020 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: invention is intended for use in the oil industry and can be used in the operation of wells in which elevated deposits of various kinds are formed, for example, asphalt-resin-paraffin deposits. Process of filling a tubing string with a solvent is controlled by two pressure sensors installed at distance of 10 meters from each other along a vertical inside the tubing string of increased diameter located above the bottom pump. To fix the moment of appearance of solvent above the pump in front of it a reference liquid of increased density, for example highly mineralized water is supplied to the tubing string. Rate of solvent pumping and the volume of reference fluid are selected so that the reference fluid is reliably fixed by pressure sensors for significant increase in the pressure difference between the sensors. Injection of solvent into the tubing string is carried out through the liquid meter, therefore not only the volume of the injected solvent, but also the initial volume of deposits in the tubing are estimated.

EFFECT: higher efficiency of washing of tubing and electric centrifugal pump by organic solvent by control of complete filling of pipes and pump with solvent, rational use of solvent.

1 cl, 2 dwg