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

FIELD: oil-producing industry, in particular, killing the development wells in performance of repair jobs. SUBSTANCE: injected into annular space with tubing open at the wellhead is viscoelastic compound in volume equalling the volume of annular space and tubing, then it is closed at the wellhead, and injected through annular space is viscoelastic compound in volume of well below the tubing. Then injected through annular space is killing fluid with density determined by mathematical expression. If pressure at wellhead does not rise above the casing tests pressure, the killing fluid is injected in volume equals to that of annular space with tubing closed at wellhead. The tubing is opened and killing fluid is injected in the volume equals to volume of tubing. Tubing is closed at wellhead and excessive pressure is built up at wellhead. Then well is shutoff for process holding. If wellhead pressure rises above the casing test pressure, killing fluid is injected through annular space with tubing open at the wellhead. Tubing is closed. Excessive pressure is built up at the wellhead, well is shutoff and left for process holding. EFFECT: higher efficiency. 5 cl