FIELD: gas and oil industry. SUBSTANCE: casing string is lowered down borehole. Forcing-through of cement mortar after casing string is lowered is performed on the basis of its climbing to height of productive seam in hole clearance. Then casing string is lifted above productive seam with rate not exceeding rate of climbing of cement mortar in hole clearance. After this casing string is descended to previous depth and remaining part of cement mortar is forced through into hole clearance. EFFECT: enhanced reliability of method. 4 dwg
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Authors
Dates
1996-04-10—Published
1990-05-22—Filed