Patent ID: 9133697
Filing Date: 2015-09-15
Classification: E21B,Y10T

Abstract:
1. A system for installation in a wellbore, comprising: a downhole fluid heater in a downhole treatment string, the downhole fluid heater having a treatment fluid inlet, an oxidant inlet and a fuel inlet; a downhole control valve actuable using fluid pressure in an annulus between the downhole treatment string and a wall of the wellbore, the fluid pressure in the annulus acting on the downhole control valve and residing in communication with one of the treatment fluid inlet, oxidant inlet or fuel inlet of the downhole fluid heater, the downhole control valve responsive to cease flow to the inlet based on a loss of the fluid pressure in the annulus between the wellbore and the downhole treatment string; a first seal disposed between the downhole fluid heater and the downhole control valve, the first seal adapted to contact the wall of the wellbore and hydraulically isolate a portion of the wellbore above the first seal from a portion of the wellbore below the first seal; a second seal disposed between a well head of the wellbore and the first seal and opposite the downhole control valve from the first seal, the second seal adapted to contact the wall of the wellbore and hydraulically isolate a portion of the wellbore above the second seal from a portion of the wellbore below the second seal; and a conduit in communication with a space between the first seal and the second seal and adapted to provide additional pressure to the annulus of the wellbore between the first seal and the second seal.