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 can also help during the design phase to identify where the cement (lead, […]
Workover Cementing Techniques. (3) Plug Cementing
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 […]
Workover Cementing Techniques. (2) Squeeze Cementing
Squeeze cementing is basically a filtration process that occurs during the placement of the cement slurry into a wellbore entry point (casing leak, existing perforations, etc.) under sufficient differential pressure. The cement slurry is held in place until it cures and establishes a hydraulic seal. Look at this picture in Squeeze Cementing Principles explaining the […]
Workover Cementing Techniques. (1) The Injectivity test
I want to present a series of posts covering cementing techniques applicable during workover, including specific job requirements, fluid characteristics, and testing procedures for each of the following job categories: Remedial cementing, well abandonment, and fluids control/shut-off. I am initiating this series of posts, with an essential step in remedial cementing and the squeeze process: […]
Sample Cement Job Evaluation
Pressure analysis of a 9 5/8” casing cementing operation. Information gathering 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 job reports, DDR, […]
Balanced-plug method. Basic calculations
Free Balanced Plug Calculator at the end of this post. Check it out ! The most common placement method is the balanced plug technique. The work-string is run into the wellbore to the desired depth for the plug base. Contamination or mixing with the control fluid is avoided by the use of appropriate volumes of […]
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