If we consider the main variables to ensure proper mud in hole replacement with cement: stand-off, fluids rheology (friction pressure hierarchy) and placement regime (as related to pumping rate); the amount of cement left in the hole (cement coverage), if no losses, quickly reduces (leading to increase cement returns, either to surface or above the […]
Cementing. Challenges across permeable zones
This article will provide you with some actionable suggestions for cementing across permeable zones. In previous posts, I have already talked about the effect of formation permeability on the apparent cement presence behind casing, as seen on cement logs. (See: Excellent cement job, but with terrible results … how is this possible?) Keep in mind that […]
What can you expect in an Expert Post-Job Analysis?
Please support better well cementing. A post-job analysis is among the first steps to developing a learning organization, but what is a learning organization? Before answering this question, just very quickly, let us answer a more basic one; where does quality start? Moreover, by “quality,” I mean measurably meeting requirements, expectations or achieving objectives. Quality […]
Cementing Process Quality Assurance
This page gives a helpful breakdown of all the important steps during the well-cementing process. At the moment of the cementing operation, field personnel in supervisory roles are responsible for overseeing the location job preparations and execution. This responsibility primarily lies with the cementing contractor. This contractor is expected to have a system in place […]
Liner Cementing Challenges and Solutions
1. Considerations for Pre-flush/Spacer In liner cementing operations, the bottom wiper plug, which is responsible for mechanically separating the cement slurry from the spacer ahead, is sometimes not available. This availability issue is due to the characteristics of many common liner tool systems in use. This limitation results in increased front-end contamination of the cement slurry […]
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