Back in 2016, I posted an article on laboratory testing for cement slurries. In this article I briefly referred to the changes in the preparation of the slurry in the laboratory to account for the additional mixing energy typical in small slurry volume jobs using batch-mixer, like in CT operations. In fact, it is common […]
Cement Slurry Design Decision Tree
There is a principle I have always come to appreciate when talking about designing cement slurries, that is “the simpler the better”. In this context this means the use of the less possible additives, and in their lowest practical concentration, that are able to provide the desire cement slurry features. The principle is based […]
A talk about Fluid Loss
What FL is required and how it can be optimized? Conceptually, FL control is required every time there is a permeable formation, which creates a risk (A: can we quantify this risk?) of cement slurry liquid phase filtration that in consequence creates a risk (B: can we quantify this risk?) to lose zonal isolation. A: […]
Cement Slurry Laboratory Testing
Recommendations WARNING: No slurry should ever be pumped without a laboratory test using the actual materials (cement, additives and field water) to be mixed on the job. Compatibility tests should be performed between the cementing fluids and wellbore – drilling or control – fluids, formation fluids and any other fluid potentially in contact with cement […]
Squeeze Cementing Principles
Sometime ago I put together a short paper about the principles of squeeze cementing. Below is an extract of this document. Successful squeeze cementing relies mostly on selecting the correct cement slurry to form an effective cement cake or node. The decision shall be based on the injectivity test performed before the squeeze operation. There […]
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