Abstract
Background The subsurface equipment of an oil producing well serves for recovery products to the surface of the earth and its structurally imperfect for delivering a physicochemical reagent to receive a submersible pump suction. Periodic and timely flushing of the pump and the tubing string with a suitable solvent while maintaining the necessary characteristics of the gas-liquid composition at the pump suction is the key to a long and effective operation of the producing well. In the article it was considered the existing technologies for the delivery of reagents to the zone with deposits and prepossessed a new route for the movement of solvent and inhibitor from the wellhead pump to the electric centrifugal pump suction. Aims and Objectives: o analysis of technologies for the delivery of organic solvent to the submersible pump suction for an oil well, complicated by the presence of asphalt-resin-paraffin deposits (ARPD), to identify the potential for improving this technological procedure; o development of an intrawell device for target delivery of reagents to the submersible pump suction. Methods: o study of the experience of using capillary and coil-tubing pipes for injecting solvents and inhibitors into the zone with well deposits; o estimation of operating parameters of the reagent tube in the cavity of the column of tubing strings using the Darcy-Weisbach equation. Results To remove ARPD from a deep pumping equipment, oil companies, as a rule, use solvent injection through the annulus, thereby reducing the functionality of the reagent. Oil industry workers proposed for consideration the scheme of reagent supply through a tube of considerable diameter located in the cavity of the tubing string.
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