QUANTITATIVE DIAGNOSTICS METHODS FOR ASPHALT-RESIN-PARAFFIN DEPOSITS IN WELLS AND OIL PIPELINES

Abstract

Background The formation of asphalt-resin-paraffin deposits in oil-producing wells and oil collectors depends largely on the temperature and pressure conditions for transporting the gas-liquid mixture; therefore, monitoring the temperature and pressure at oil producing facilities along the entire length of the facilities becomes relevant. The appearance of organic deposits in the well leads to a change in the speed of movement of the well production, retains its thermal energy, increases the pressure in the pipes. The equilibrium in the «reservoir - well - pump» system changes due to the increase in pressure at the discharge of the submersible electric centrifugal pump. Temperature sensors, installed evenly along the length of the lifting pipe string, provide important information on the temperature distribution in the pipe string without deposits and with deposits. Thermometry during the well operation will show the effect of fluctuations in the dynamic level of the fluid on the formation of sediments, will increase the informational content of measures for the inhibition and removal of sediments from wells. Aims and Objectives: to justify different methods of using pressure and temperature sensors in wells and oil gathering pipelines for evaluating their internal state; show the possibility of thermometry on a stationary basis for the implementation of a quantitative diagnosis of deposits in the tubing string of an oil producing well. Methods The known dependences of the state of the gas-liquid mixture on the thermobaric conditions in the tubing string of the well pipes and the continuity equation of the pipeline products are used. Results A method has been developed to monitor the formation of asphalt-resin-paraffin deposits in a tubing string according to temperature sensors, which are uniformly distributed along the length of the tubing on a stationary basis.