Development of blocking compositions with a bridging agent for oil well killing in conditions of abnormally low formation pressure and carbonate reservoir rocks

Production well killing before workover operations in late-stage oil and gas-condensate fields can be complicated by abnormally low formation pressure, carbonate type of reservoir rocks, high gas-oil ratio. These complications lead to the intensive absorption technological fluids gas ingresses, which, its turn, increases time wells putting them on production, reduction productivity, additional costs. Therefore, it is crucial develop a high-performance well-killing composition that would allow improving efficiency geological, physical, conditions at expense reliable overlapping perforation interval (or open wellbore) prevent intakes outflow from formation. To blocking compounds, set laboratory tests has been carried out, including physical chemical (determination density, viscosity, thermal stability, sedimentation etc.) research filtration properties compositions during simulation fractured reservoir. In course tests, choice fractional polymer filler concentration was substantiated emulsion increase their application under wells. As result field containing bridging agent (microcalcite) were developed, which preventing formations and, as result, preserving productivity.