Abstract
The paper considers the problem of controlling the process of thermal dewaxing of oil and gas wells using a heating cable. An axisymmetric mathematical model of heat and mass transfer processes in an oil well is proposed, the implementation of which makes it possible to estimate the temperature distribution on the wall of a pumping compressor pipe, to determine the area of possible deposition of asphalt-resin-paraffin substances and the necessary conditions to prevent their formation. The mathematical model is a system of differential equations based on the laws of conservation of energy, mass and momentum. Considers the basic principles of heating cable control used in modern thermoelectric installations. The inefficiency of these methods is shown, which leads to increased energy consumption and accelerated aging of the heating cable. A fundamentally new algorithm for controlling the operation of a heating cable is proposed, based on modeling the processes of heat and mass transfer in an oil well. The use of this algorithm makes it possible to obtain with a sufficiently high accuracy the temperature distribution inside the well and determine the required heating time and power to prevent the deposition of asphalt-resin-paraffinic substances on the walls of the tubing. The control algorithm is implemented taking into account the technological parameters of production, which have a significant impact on the temperature distribution in the well, and adapts to their possible change caused by the heterogeneity of the oil and gas reservoir. The proposed heating cable control algorithm makes it possible to reduce energy consumption, which is the main disadvantage of thermal dewaxing of oil wells using resistive heating, and to prevent premature equipment failure caused by possible overheating of the heating cable line. The results presented in the work can be useful in the development and operation of oil and gas wells complicated by asphalt-resin-paraffin deposits. Application of the proposed mathematical model makes it possible to evaluate the efficiency of thermal dewaxing of wells with a heating cable at the stage of field development and draw conclusions about the effectiveness of this method of combating paraffin deposits. The control algorithm based on the proposed mathematical model makes it possible to effectively use the equipment and reduce capital costs for electricity and well turnaround.
Published Version
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