FIELD: oil and gas industry.
SUBSTANCE: method includes drilling a horizontal wellbore interval "drawdown", lowering the casing string. After the casing string has reached the depth of the production string shoe, the descent is stopped, an intermediate washing with drilling fluid is carried out with simultaneous controlled supply of nitrogen till the values of hydrostatic pressure are stabilised at the level of formation pressure values to form equilibrium in the "well-formation" system. Then under conditions of formed equilibrium, running of the casing string to the planned well bottom is continued.
EFFECT: increased efficiency of oil and gas deposits development in a complex cavernous-fractured carbonate oil-saturated formation.
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