METHOD OF PREVENTION OF FREEZING OF INJECTION WELL HEAD Russian patent published in 2003 - IPC

FIELD: oil and gas producing industry, particularly, methods of prevention of freezing of injection well heads in induced slopping of fluid injection. SUBSTANCE: method of prevention of head freezing of injection well provided with tubing string includes communication of water line with annular space through valve of knee-like pipeline. Valve of knee-like pipeline operates for shutoff on side of fluid injection into well. Water line is connected with well annular space in its underground part below level of seasonal freezing of ground. In wells with high formation pressure, cavity of tubing string is communicated with annular space via valve of similar action. Thus valve is installed on external surface of tubing string also below level of ground seasonal freezing. Use of offered method provides for heat-insulation of wellhead. EFFECT: higher efficiency. 1 dwg