METHOD OF DEVELOPMENT WELL KILLING (VERSIONS) Russian patent published in 2002 - IPC

FIELD: oil production, methods of well preparation for servicing and workover, particularly, well killing. SUBSTANCE: method includes injection of killing and displacing fluids into annular space of well with opened tubing at wellhead; displacing of killing fluid below tubing with closed tubing at wellhead; injection of displacing fluid from annular space to tubing with tubing opened at wellhead. Killing fluid is used in form of oil solution of mixture of chlorinated hydrocarbons remained in rectification column still after separation of commercial trichloroethylene and methylene chloride with solvents. In this case, density of killing fluid is higher than density of displacing fluid. Killing fluid is injected into volume of well part from pump to bottom hole. According to the other version, method includes injection of killing and displacing fluids into well annular space with opened tubing at wellhead, injection of displacing from annular space into tubing. Killing fluid is used in from of oil solution of mixture of chlorinated hydrocarbons remaining in still of rectification column after separation of commercial trichloroethylene and methylene chloride with solvents. In this case, density of killing fluid is higher than that of well fluid. Displacing fluid is injected into annular space and into tubing after settling of killing fluid below tubing. Killing fluid is injected into annular space in well part from pump to bottom hole. EFFECT: lower cost of method embodiment and accelerated process of killing of development well and cleaning of well from asphalt-resinous-paraffin accumulations. 5 cl