Methods of primary cementing of wells

Details Methods of primary cementing of wells Methods of primary cementing of wells

1992-04-27

1994-05-10

Dang, Hoang C.

Wells

Processes

Cementing, plugging or consolidating

166285, E21B 3314

Patent

active

053099966

ABSTRACT:
Methods and apparatus for cementing a pipe in a well bore penetrating one or more subterranean gas-containing formations without incurring substantial gas inflow are provided. The methods basically comprise the steps of placing a hydraulic cement slurry in the annulus between the pipe and the well bore, and moving the pipe during the transition period of the slurry. The moving of the pipe maintains the hydrostatic pressure exerted by the slurry on the gas-containing formations and prevents gas flow into the slurry and the well bore. The movement of the pipe is stopped when the slurry develops sufficient gel strength to substantially block gas flow through the well bore.

REFERENCES:
patent: 2309791 (1943-02-01), Sanders
patent: 2609881 (1952-09-01), Warren
patent: 2675082 (1954-04-01), Hall
patent: 3205945 (1965-09-01), Holt
patent: 3376921 (1968-04-01), Manry et al.
patent: 3557875 (1971-01-01), Solum et al.
patent: 3951208 (1976-04-01), Delano
patent: 4919208 (1990-04-01), Schneider
SPE Paper No. 22776 presented to the Society of Petroleum Engineers on Oct. 6-9, 1991, Sutton et al., entitled "Low-Rate Pipe Movement During Cement Gelation to Control Gas Migration and Improve Cement Bond".

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