Autonomous electrical heating facility supplied by wind turbine for elimination of oil wellbore paraffin deposits
The article considers an autonomous electrical heating facility supplied by a wind turbine designed to eliminate paraffin deposits in an oil wellbore. Computer modeling of the facility is performed. Modeling results are verified with a laboratory simulation bench. Operating curves for various operating conditions are obtained. An optimal resistance of the heating cable is determined to ensure a maximal efficiency of the wind turbine, as well as the amounts of energy produced by the wind turbine with a constant load resistance and resistance control are compared.
Oil well electrical heating facility utilizing heating cable powered by autonomous wind-driven power unit
The article discusses an oil well electrical heating facility that uses heating cable and features an autonomous wind-driven power unit as the power source. The operation of the wind unit is simulated in a laboratory test bench yielding the thermal power dissipated in the load as a function of the wind speed. A proposed MATLAB Simulink model of the heating facility makes it possible to evaluate energy performance for various operating modes. The facility operating mode control ensures maximal efficiency of the wind unit under variable wind conditions and a given heating cable length.
Carbon Dioxide Elimination from Circle Systems
Ten various circle systems were studied in model experiments. All the experiments were performed using a Waters cannister containing 675–685 g of Durasorbr̀. 300 ml of carbon dioxide were supplied to the system per min. The efficacy of these systems was expressed as the time taken to demonstrate a concentration of 0.6% carbon dioxide in the gas mixture supplied to the patient connection during each respiratory cycle. The carbon dioxide elimination was studied at a gas flow of 2, 4 and 6 1 per min. All the systems showed an effective carbon dioxide elimination for 6 h or more at a flow of 2 1. An increasing efficacy was found with increasing flow, but to a varying extent.