METHOD FOR CEMENTATION OF CASING STRING IN ABSORPTION WELL Russian patent published in 1997 - IPC

Abstract RU 2083803 C1

FIELD: construction of oil and gas wells. SUBSTANCE: method can be used in cementation of casing string at presence of beds absorbing drilling liquids and plugging solutions. According to method, subject to cementation is lower part of casing string down to absorbing zone. Cementation is effected by cement slurry. In wells with catastrophic absorption, cementation of upper part of casing string is effected by dry, powder-like plugging cement which is delivered as needed by means of compressed air. Simultaneously with delivery of plugging material, transmitted to casing string are oscillations with frequency of 2-5 Hz. EFFECT: improved quality of casing string cementation due to producing continuous cement stone in hole clearance up to hole head, high efficiency.

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RU 2 083 803 C1

Authors

Ramazanov G.S.

Gafarov G.V.

Giljazov R.M.

Ziganshin A.Sh.

Dates

1997-07-10Published

1995-07-13Filed