The primary objectives for centralization design (that is the number, type and spacing of cementing centralizers) should satisfy both the need to get the casing to the bottom as well as zonal isolation. However, despite this being apparently simple and obvious, cementers do not seem to appreciate the fact that without the casing at target […]
Support Better Cementing for All – Empowering Oil Well Cementers
In 2016, I launched Better Cementing for All. Since then, it has been visited by many thousands – and probably by hundreds of oil well cementers. Now, I want to keep it alive. For more than 24 years, I have worked in oil well cementing, offering my services to some of the largest oil corporations […]
Where is your TOC now? Cementing Calculations Sheet in Excel
Before we get into the cementing calculations sheet available below, first some background. For some time already, I have been receiving requests from friends and readers, mostly drilling engineers and well-site people, to provide a quick and fact-based tool to estimate the top of cement (and all cementing fluids) after a job. A tool that […]
Sample Cement Job Evaluation
Pressure analysis of a 9 5/8” casing cementing operation. Information gathering for cement evaluation starts with the basic details of the job design, including casings information, wellbore details, formation and temperature pressures. Proper post-job analysis continues with kind of an investigation process where key information is gathered from job reports from different sources, including cement […]
Cement, Spacer, all there. But where’s the wiper plug?
I know that there is no need to remind you of the objectives of a cementing job but, to be in context, let’s mention some of the main ones such as: Providing zonal isolation Structural support for the wellbore Casing protection against corrosive fluids. Failing to meet these objectives could potentially have consequences, in terms […]
All you need to know about Bentonite in Cement Slurries
Let’s have a quick overview regarding bentonite. It is easy to find references online regarding bentonite as a cement extender, the way it works (or I should say reacts), and why additional water is required when using it as an extender. Here I will try to explain as simply as possible, for readers of all […]
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