C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
31/19, 261/53
C04B 24/18 (2006.01) C04B 24/06 (2006.01) C09K 8/467 (2006.01) E21B 33/13 (2006.01)
Patent
CA 1159642
ABSTRACT OF THE DISCLOSURE The disclosure describes a high efficiency non-gell- ing cement retarder composition having a high degree of pre- dictability for controlling the rheology and setting time of hydraulic cement. The composition comprises a combination of at least one water soluble hydroxy carboxylic acid and a low molecular weight sulfomethylated lignin wherein the lignin has a narrow molecular weight range and an average molecular weight in the range of about 2,000-10,000. The lignin is substantially sulfoalkylated at the position ortho to the free phenolic group of the benzene ring of the lignin mole- cule and the sulfonate radical is in the form of acid, salt or combinations thereof and is attached to the ortho position by an alkylidene radical having one to three carbon atoms. A process of sealing at an elevated temperature a zone pene- trated by a wellbore using the above cement retarder is also disclosed.
424969
Childs Jerry D.
Love Roosevelt
Company Halliburton
Swabey Ogilvy Renault
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