Wells – Processes – Cementing – plugging or consolidating
Patent
1979-06-11
1981-02-24
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
106 97, E21B 3314
Patent
active
042521939
ABSTRACT:
A 9 to 12 ppg (1.08 to 1.4 kg/liter) cement slurry for use in oil well type completions which comprises hydraulic cement about 10 to about 30 weight percent hollow glass microspheres based on the weight of the cement and sufficient water to form a pumpable slurry with an API free water content of no more than about 2 volume percent. This slurry is preferably mixed with an amount of water required to produce a slurry with the hydraulic cement having at least an API minimum water content and an API free water content of no more than about 2 volume percent and an additional amount of water equal to about 1.3 to about 1.8 weight percent water based on the weight of the hydraulic cement for each weight percent of the microspheres. The microspheres have true particle densities of about 0.2 to about 0.5 gm/cm.sup.3, hydrostatic collapse strengths of at least 500 psi (3447 kPa) and average particle diameters of less than about 500 microns.
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Parker et al., Additives Tailor Cement to Individual Wells, Oil and Gas Journal, vol. 75, No. 11, Mar. 14, 1977, pp. 54-58.
"API Recommended Practice for Testing Oil Well Cements and Cement Additives", American Petroleum Institute, Washington, D.C., API RP-10B, 20th Edition, Apr. 1977.
Holman George B.
Powers Charles A.
Smith Robert C.
Hook Fred E.
Novosad Stephen J.
Standard Oil Company (Indiana)
Suchfield George A.
Traut Donald L.
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