RESOURCE-ENERGY EFFICIENCY OF ARTIFICIAL LIFT SELECTION FOR WELLS WITH FREQUENCY CONTROLLED PUMP

Abstract

The relevance of the research is related to the issues of increasing the operation efficiency of wells equipped with an electric submersible pump, based on the optimal choice of operating mode, frequency and parameters of power equipment according to the profit criterion delivered by a «pump – motor» pair during the full life cycle of its operation. The possible variability of operating conditions is taken into account by adjusting the planning horizon of the criterion. The main scope: formalization of the optimal choice of operation mode, input power frequency and parameters of electric submersible pump equipment, while taking into account direct energy costs and indirect factors of accelerated wear in stationary operating conditions with an adjustable planning horizon Methods: material and heat balances, hydrostatics, linearized kinetics of head losses in lift segments, numerical integration and analysis of nonlinear systems, typical formalization of optimization problems. Results and summary. Taking into account the main factors of accelerated wear in the profit criterion expands the range of definitions of optimal solutions, anticipating the overestimated choices of initial productivity by the fact of reducing the total profit on complete life cycle of the electric submersible pump operation. The problem of possible variability of operating conditions is partially taken into account in the scheme for estimating stationary optimal solutions by introducing the planning horizon indicator into the criterion. The decrease in the energy efficiency of the electric submersible pump operation at shifted frequencies indicates that the «visible freedoms» of frequency regulation have a price to use and chosen frequencies in the optimal solutions with long operation periods approaches synchronous value with the maximum electric submersible pump efficiency. The proposed thermobaric and energy description of the system equilibrium states, taking into account the factors of the dynamics of electric submersible pump resource consumption, allows using simplified model solutions as the primary basis for the subsequent construction of adaptive automated regulations for operational control and management under conditions of uncertainty.

Keywords

• models
• goals
• algorithms
• complicating factors
• temporal hierarchy of control
• hydrostatics
• electric centrifugal pump
• service resource