Wells – Processes – With indicating – testing – measuring or locating
Patent
1993-04-30
1994-07-12
Suchfield, George A.
Wells
Processes
With indicating, testing, measuring or locating
166253, 166291, 166292, E21B 3316, E21B 4706, E21B 4710
Patent
active
053279697
ABSTRACT:
The present invention provides a method of preventing gas migration during primary well cementing. The method basically comprises the steps of displacing a cement slurry into the annulus between a string of pipe to be cemented in a well bore and the walls of the well bore, determining the initial surface pressure in the pipe after the cement slurry is placed in the annulus, displacing additional cement slurry into the annulus as is necessary to make up for losses in the surface pressure due to cement slurry gel strength development and volume reduction whereby the surface pressure is maintained substantially equal to the initial surface pressure until the cement slurry develops a predetermined gel strength sufficient by itself to prevent gas migration, and then allowing the cement slurry to set into a hard impermeable mass in the annulus.
REFERENCES:
patent: 2742090 (1956-04-01), Garrison
patent: 3213940 (1965-10-01), Wood
patent: 3277962 (1966-10-01), Flickinger et al.
patent: 3572438 (1971-03-01), Rohe
patent: 4235291 (1980-11-01), Messenger
patent: 4304298 (1981-12-01), Sutton
patent: 4524828 (1985-06-01), Sabins et al.
patent: 4655286 (1987-04-01), Wood
Paper entitled "Transition Time of Cement Slurries Between the Fluid and Set State" by Fred L. Sabins, John M. Tinsley and David L. Sutton, presented at the 55th Annual Fall Technical Conference and Exhibition of the Society of Petroleum Engineers held in Dallas, Tex. Sep. 21-24, 1980.
Sabins Fred L.
Sutton David L.
Dougherty, Jr. C. Clark
Halliburton Company
Kent Robert A.
Suchfield George A.
Weaver Thomas R.
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