Well Killing Technology before Workover Operation in Complicated Conditions

Well killing is an important technological stage before conducting workover operation, one of the tasks which to preserve and restore natural filtration characteristics bottomhole formation zone (BFZ). Special attention should be paid choice well technologies development wells in complicated conditions, include abnormally low reservoir pressure, high oil-gas ratio carbonate type. To productive prevent fluid losses producing during blocking compositions are used. At same time, informed most effective required. Consequently, there a need conduct laboratory physicochemical coreflood experiments simulating geological, physical, conditions field development, as similar possible actual conditions. The article presents results experimental studies on operation various oil development. Physicochemical were carried out with simulation processes use modern high-technology equipment Enhanced Oil Recovery Laboratory Department Development Operation Gas Fields at St. Petersburg Mining University. As result studies, new stimulation fluids developed, ensure loss, gas breakthrough, preservation, restoration improvement BFZ terrigenous reservoirs different stages It determined that developed process fluids, surfactants (YALAN-E2 NG-1), have hydrophobic effect porous medium rocks, ultimately contributes BFZ. value presented research relevant for practice confirmed by fact that, tests technology composition inverse water–oil emulsion efficiency was obtained form increase their production rate average 5–10 m3/day, reducing time required start operating up 1–3 days water cut 20–30%.