Abstract
Abstract More widespread application of coiled tubing workover operations involving cement slurry placement has developed in recent years because of associated advances in coiled tubing technology.1–3 Consequently, one of the parameters of job design which has come under scrutiny for cement slurries associated with coiled tubing operations is the effect of various levels of mixing energy during batch mixing, as well as the effect of shear through a coiled tubing spool.4-7 The measurable effect on a cement slurry batch mixed for extended periods of time can be seen as being very much a factor of the slurry design (admixtures, water ratio, etc.) as well as the energy applied at the point of cement-water contact.8 The work presented in this paper examines the effects of various levels of energy (mixing power) imparted by batch-mixing equipment on various types of cement slurries. Likewise, the effects, on a slurry, of pumping it through a length of coiled tubing are also examined.
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