Elektrotehnìka ta Elektroenergetika (Oct 2019)
CURRENT STATE AND PERSPECTIVES OF DEVELOPMENT OF DESIGN OF ELECTRIC DISCHARGE SUBMERSIBLE DEVICES FOR TREATMENT OF WELLS
Abstract
Purpose. Assessment of the current state, design features and development prospects of electric-discharge submersible devices for well treatment. Methodology. Analysis of the principle of operation and design of electric-discharge submersible devices for well treatment. Findings. The necessity of using the multi-stage energy conversion schemes for the electric-discharge submersible devices for well treatment is justified, taking into account the features of electric-discharge effects, critical conditions for processing the bottom-hole zone of the well, increased reliability requirements for all units of the submersible part of the complex and the remoteness of the processing object from the power source. The design features and characteristics of the electric-discharge submersible devices of leading world companies (Novas (Russia), Blue Spark (Canada), I-Pulse (France), the Institute of Pulse Processes and Technologies of the National Academy of Sciences of Ukraine engaged in its production and processing of oil wells are considered. It has been established that all operating devices have a block structure, herewith the connected blocks of a charge system, a capacitive energy storage device, a high-voltage switch, and an electrode system are delivered directly to the zone of the oil reservoir on the connecting cable. It was found that the parameters of the electric discharge in the installations of different companies vary within wide limits (discharge voltage from 2.5 to 30 kV, pulse energy from 1 to 2 kJ), energy switching in the discharge circuit can be either controlled or uncontrolled, and to convert electric energy into acoustic energy, an electric explosion of a conductor is used, as well as a free spark discharge in a borehole fluid or a specially prepared aqueous solution with electrical characteristics specified depending on the conditions in the borehole. The prospects for the development of electric discharge equipment and technology to increase the inflow of oil into the wells are determined. The commercial-economic, scientific-technological and technical aspects of the prospects for the development of this trend in Ukraine are highlighted. Originality. The necessity of using the multi-stage energy conversion schemes for the design of the electric-discharge submersible devices for well treatment is justified. The commercial-economic, scientific-technological and technical aspects of the prospects for the development of equipment and technology to increase the inflow of oil into the wells are determined. Practical value. The analysis of the technical developments of leading world companies in the field of increasing oil inflow into wells using a high-voltage electric discharge made it possible to identify further ways to improve domestic technology and equipment, which will make a significant contribution to Ukraine's energy independence.
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