METHOD OF WELL CONTROL UNDER CONDITIONS OF INERTIAL EFFECT AT PRIMARY OPENING OF PRODUCTIVE OIL-GAS-SATURATED STRATUM Russian patent published in 2019 - IPC E21B21/08 

FIELD: drilling of soil and rocks; mining.

SUBSTANCE: invention relates to drilling of oil and gas wells, namely to well control under conditions of absorption and manifestations in productive oil and gas-saturated formation, and can be used in drilling and development of oil, gas and industrial brines (brine). Proposed method comprises primary opening of productive oil-and-gas-saturated formation by drilling in conditions of full absorption of flushing fluid. At the same time from the moment of occurrence of absorption at drilling, continuous automatic refilling of the well is performed with the applied drilling fluid in annular space with output of 3–5 l/s in order to compensate for the negative difference between the static and dynamic levels, without allowing the well's rapid transition from absorption to gas-oil-and-water development. When lifting the drilling tool with piston, the well is refilled with the applied drilling fluid in the annular space by means of the cementing unit through each 100 m in the volume of the lifted metal of the drill pipes plus 0.3 m³.

EFFECT: enabling the process reliability of drilling at the stages of exploration and development of brine, oil and gas deposits.

1 cl, 4 dwg