FIELD: oil and gas industry.
SUBSTANCE: invention relates to the oil and gas production industry, namely to technologies for the prevention of the manifestation of formation fluid during the construction of oil and gas wells, in particular to the elimination of overflows in developing formations. Method comprises sequentially injecting a blocking pack and a drilling fluid into the formation. In this case, an emulsion-suspension system containing 5–20 % by weight of diesel fuel or prepared oil from a point of preparation and pumping of oil, 2–3 % by weight of an emulsifier, 0.5–1 % by weight of a colloidal solution of silica nanoparticles having a particle size of 5 to 100 nm, 3–5 % by weight of dry amorphous silica (92–99 %) with a particle size of 5 to 500 nm, 10–15 % by weight of microparticles of ilmenite or trimanganese tetraoxide with a particle size of 0.2 to 5 mcm, an aqueous solution of calcium chloride or potassium chloride is the remainder. In this case, an aqueous solution of calcium chloride or potassium chloride is used as a drilling fluid.
EFFECT: technical result is to increase the technological efficiency of measures to prevent manifestations and eliminate overflows in the formation-well system in developing reservoirs with a high gas factor or abnormally high reservoir pressure, as well as simplification of the method.
5 cl, 6 ex, 4 dwg
