Wells – Processes – Cementing – plugging or consolidating
Patent
1977-02-07
1978-04-11
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
106 81, 106 84, 252 855B, E21B 2100, E21B 3314, E21B 3316
Patent
active
040834077
ABSTRACT:
A composition comprising water, a water soluble alkali metal silicate, and a water soluble metal compound capable of releasing a multivalent metal cation to react with the soluble silicate to form a pumpable gel is employed as a spacer for displacing a drilling mud from a borehole, particularly immediately preceding injection of a fluid, such as a cement slurry, containing compounds capable of detrimentally reacting with the mud. Optionally, the composition may contain one or more of: a water dispersible cellulose compound and an inert particulate which cooperate to provide fluid loss control; a chelating agent for polyvalent metal cations; a weighting material; a material to minimize lost circulation, and a salt to stabilize fresh water sensitive sandstones and shales.
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Griffin, Jr. Thomas J.
Moran Larry K.
Korfhage Glenn H.
Novosad Stephen J.
The Dow Chemical Company
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