TECHNICAL SOLUTIONS FOR REMOVING ASPHALT-RESIN-PARAFFIN DEPOSITS WITH SOLVENTS FROM OIL-PRODUCING WELLS

Abstract

The relevance of the study follows from the fact that there is residual oil of increased density with a significant content of heavy components, primarily asphaltenes and resins, in many fields. For many oil companies, there is an increase in the production of wells, the operation of which is complicated by the formation of asphalt-resin-paraffin deposits. Aims: to perform an overview analysis of the application of methods for preventing and removing asphalt-resin-paraffin deposits in oil fields and to develop an arrangement of underground well equipment based on the use of a reagent tube for delivery of reagents of any type and dosage for receiving an electric submersible pump. Objects: methods for removing asphalt-resin-paraffin deposits based on the use of organic solvents which are delivered to the intake of a deep pump along the annulus and the tubing. The article discusses all possible options for reagent delivery: two types along the annulus and the same amount along the tubing string. Methods: based on the laws of physical hydrodynamics, the basics of indicator (reference) technologies and comparative analysis of technical innovations in the world experience of dealing with well deposits. Results. The authors have substantiated the need to locate the reagent tube inside the tubing string; developed the design of the reagent tube and pumping equipment, which ensures the delivery of any type of reagent to the intake of an electric submersible pump. It was proposed to determine the degree of filling of the tubing string by means of an intermediate – reference – fluid with properties different from borehole fluid and organic solvent. The paper introduces the theory of double oil flow in the annular space to explain the results of factor analysis of the successful delivery of the solvent through the annulus of the well with asphalt-resin-paraffin deposits.

Keywords

• well
• reagent tube
• inhibitor
• pressure sensor
• density
• asphalt-resin-paraffin deposits
• annulus
• reference fluids
• organic solvent