to the upper surface 84 of the footed wellbore 18 and thus pass above the pump 38 and they are therefore not sucked into the pump entry when pump 38 is operating the oil at the location of the pump 38 cooled by the vaporization of steam condensate is thus in a temperature range below 280 degrees fahrenheit and thus the use of nitrile rubber as the stator coating material is enabled the position of the pump 38 within the footed wellbore is determined by a consideration of the expected interface 70 position within the well bore and the expected temperature of the oil entering the footed wellbore from which a hydrostatic head pressure profile can be calculated as a result the likely location at which bubbles will form and thus cool the oil can be predicted furthermore the pump is operated to pump the hot fluids in the wellbore 18 such that the pressure at the pump inlet remains in the 20 to 35 psig range which ensures that the pump will not run dry but also ensures that the temperature of the oil adjacent the pump is cooled by the evolution of steam bubbles 80 from the fluid the lower end of the pressure range ensures that some well fluid is present above the pump 32 inlet 59 equivalent to approximately 5 psi of head less the pressure exerted by steam and gas in the wellbore the upper limit of the pressure range is selected to ensure that the pressure is sufficiently low at the temperatures the fluid is expected to be present in the footed borehole 18 such that bubbles 80 will form adjacent to the inlet 59 to cool the fluid surrounding the pump 32 thus the controller controls the.