FIELD: oil-and-gas industry.
SUBSTANCE: proposed method comprises lowering the pipe casing and cementing its cavity, formation of cavity in preset interval and filling it with mortar. Cavity is formed by cutting of casing pipe and withdrawal from the well. Availability of impermeable baffle is defined. In case said spacing between baffle flooded and productive beds exceeds 10 m or is less than 2-3 m, casing pipe is cut by 5-6 m above bottom productive bed. In case baffle depth makes less than 2-3 m, casing pipe is cit down to productive bed bottom. Then, temporary oil-well tubing is lowered to bottom for it to be flushed and to fill in mortar in the cavity at interval from the borehole bottom to productive bed bottom. Now oil-well tubing is withdrawn from the well and, after gardening of mortar, casing string is processed to cement crust.
EFFECT: higher efficiency and reliability of isolation between flooded and productive seams.
2 cl, 4 dwg
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