Continuing with these series of posts covering some of the cementing techniques applicable in workover operations, I want to talk further about plug cementing. In previous posts, I have covered extensively plug cementing. This time I am providing information regarding laboratory testing and some considerations when cement plugs intended for well abandonment. Cement Slurry Properties […]
Mixing Energy or Shear Rate? The effect on Cement Slurry?
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 a batch-mixer. (Like in coiled tubing/CT operations). A typical use […]
Cement Slurry Mix Design Decision Tree
The optimal cement slurry mix design principle There is a principle that I have always come to appreciate when talking about designing cement slurries. This principle is easy to remember: ‘the simpler, the better’. In this context, this means the use of the less possible additives, in their lowest effective concentration, that can provide the […]
A talk about API Fluid Loss
What FL is required and how it can be optimized? Conceptually, API fluid loss (FL) control is required every time there is a permeable formation. This creates a risk (A: can we quantify this risk?) of liquid phase filtration of the of the cement slurry. That, in consequence, creates a risk (B: can we quantify this […]
Cement Slurry Laboratory Testing
Recommendations WARNING: No cement slurry should ever be pumped without a laboratory test using the actual materials that will get mixed on the job. (Cement, additives and field water). Perform compatibility tests between the cementing fluids and wellbore. Drilling or control fluids, formation fluids and any other fluid potentially in contact with the cement slurry. a) Thickening Time […]
Squeeze Cementing Principles
Some time 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. We base the decision shall on the injectivity test performed before the squeeze operation. […]
Recent Comments