Patent ID: 7740708

Claim:
A method of cleaning, treating, and/or stimulating a wellbore reservoir having a pre-determined downhole pressure using an open-loop system, the method comprising the steps: providing a surface-mounted assembly comprising a heater device, a charge pump connected to an intake side of the heater device, a fluid flow volume controller configured to regulate a volume of fluid admitted into the heater, a discharge pump connected to an outlet side of the heater device, a discharge flow controller and a discharge pressure controller operationally connected to the discharge pump; providing a source of treating fluid; heating the treating fluid to a predetermined temperature; forcing the treating fluid through the heater device to thereby heat the treating fluid to a pre-determined temperature suitable for cleaning, treating, and/or stimulating the reservoir, while regulating, by the fluid flow volume controller, a volume of the treating fluid admitted into the heater device based on anticipated volume of the treating fluid required for cleaning, treating, and/or stimulating the reservoir; connecting said discharge pump to an inlet side of the reservoir being cleaned, treated and/or stimulated; activating the discharge pump to increase the pressure of the treating fluid to a degree sufficient to overcome the downhole pressure, while delivering the treating fluid into the wellbore; controlling the volume and pressure of the treating fluid exiting the discharge pump, through the discharge flow controller device and the discharge pressure controller device, to thereby regulate the amount of treating fluid delivered under pressure into the wellbore to overcome pressure existing in a tubing downhole; and channeling the heated treating fluid from the discharge pump into the reservoir under pressure, thereby cleaning, treating, and/or stimulating the reservoir.