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WORKING OUT OF AN ESTIMATION METHOD OF OPTIMUM PARAMETRES ELECTROHEATING WELL FOR PREVENTION OF PARAFFIN FORMATION
Abstract
One of the complicating factors in oil production is the deposition paraffin, as a result of which the production well rate is decreasing and the Electric submersible pump failure occurs. The main factors influencing the intensity of paraffin formation are: downhole temperature, gas evolution, hydrocarbon composition in each phase of the mixture, high viscosity of oil, change in the velocity of the gas-liquid mixture. To solve problems, the thermal method is used, which consists in artificial increase of the well temperature and bottomhole zone. By using special electric heating cables and heaters, the temperature of the oil flow is maintained high. The electric cable, heating the tubing surface, heats the oil flow to a temperature above the melting temperature of the paraffin, thereby preventing the formation of deposits. For the steady-state operation of the production well, the parameters for heating the cable and the temperature of the well elements were calculated for different cable locations-inside and outside the tubing. A good agreement between the test results of downhole heaters and theoretical calculations is shown.
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References7
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