METHOD FOR KILLING DEVELOPMENT WELL Russian patent published in 1997 - IPC

FIELD: oil production, in particular, methods for killing the development wells provided with deep well pumping equipment for underground well repair. SUBSTANCE: method includes injection of viscoelastic compound into tubing in volume equalling the tubing volume, and into annular space, in the volume of annular space. Killing fluid is injected into annular space. Well is shutoff for process holding. Viscoelastic compound is injected into tubing and annular space through annular space with tubing open at wellhead to force well fluid from tubing and annular space to the surface. Killing fluid is injected into annular space with tubing closed at wellhead and well is shutoff for process holding. Killing fluid is used in the form of solution of soda ash which density is determined by a mathematical expression. If development well is killed at abnormally high formation pressure and low intake rate of producing formation, it is required, after process holding to replace viscoelastic compound in tubing with killing fluid by its injection in volume equals to volume of tubing to annular space with tubing open at wellhead. EFFECT: higher efficiency of killing the wells provided with deep well pumping equipment. 3 cl