Aqueous storable cement spacer system
a cement spacer and aqueous cement technology, applied in the direction of sealing/packing, wellbore/well accessories, sustainable waste treatment, etc., can solve the problems of unpumpable mass mixing of the two, and the storage time of the finished spacer prior to pumping into the wellbore is generally limited to no mor
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example 1
[0036] To about 375.14 grams of fresh water, was added 1.13 grams of iota carrageenan. The mixture was mixed for 30 minutes until a viscosity of 15 cps was reached, at 25° C. To the resulting mixture was added 2.29 grams of the cement spacer ULTRA FLUSH 2™ concentrate, a proprietary product, containing welan gum, of BJ Services Company. Mixing was continued until the concentrate was dispersed into the aqueous phase. 629 grams of barite was then added to the resulting mixture. Mixing was continued for 10 minutes. 42.84 mls of SS-2, an oxyalkylated alkyl ester surfactant, a proprietary product of BJ Services Company, and 28.56 mls of US-2, a proprietary product of BJ Services Company containing d-limonene, were then added to the mixture. Mixing was continued until homogeneity was obtained. Upon transportation to the drilling site, the mixture is highly effective as an aqueous cement spacer system.
example 2
[0037] A cement spacer system was prepared by slowly adding, to about 468 grams of fresh water, about 0.7 g of scleroglucan. The mixture was stirred for about 30 minutes at room temperature. To the resulting mixture was slowly added about 2.3 g of ULTRA FLUSH 2™ concentrate while stirring. The mixture was stirred for at least 5 minutes to assure proper dispersion of the ULTRA FLUSH 2™ concentrate. About 535.5 g of barite was then slowly added to the mixture. The resulting mixture was then stirred or about 5 minutes. It was not necessary to add either SS-2 or US-2.
example 3
[0038] To about 217 g of fresh water was slowly added about 2.6 g of iota-carrageenan. The mixture was hydrated by stirring for about 30 minutes. About 217 g additional fresh water was added to a blender cup, along with about 3.6 ml of FP-6L, a proprietary alcohol based defoaming agent of BJ Services Company. About 1.7 g of NaOH was further added to the blender cup and the mixture was mixed for about 2 minutes. About 12.9 g of bentonite was then added to the blender cup and the mixture stirred at 4,000 rpm for about 10 minutes. The contents of the blender cup were then added to the mixture of iota-carrageenan and fresh water. To the resulting mixture was then added about 405 g of barite. About 28.5 ml lignosulfonate retarder, commercially available from BJ Services Company as R-21L, was then added to the mixture. Optionally, a portion of the R-21L may be added with the barite in order to get the barite into the mixture. About 28.5 ml of a naphthalene sulfonate dispersant, commercial...
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