In some cases, losses can be seen while running the casing or circulating before cementing. This opens the alternative to pump an LCM pill as a possible mitigation to lower the losses ahead of the cement job. However, based on experience with float equipment, the following actions are recommended: Always implement the equipment manufacturer recommendation […]
Was the cement job good or bad?
Well, this is the question: was the cement job good or bad? The final answer will depend on the job objectives. Were they met? In most cases, aditional information is required, like a cement evaluation log, a pressure test or even during well completion. However, some inmediate signs can give an indication if the cement […]
Actions to prevent Cement Slurry Contamination in Primary Cementing (Liners)
This post provides aditional information and more detail to fluids intermixing in Liner Cementing and rheology in primary cementing What are the concecuences? Poor Cement Log Evaluation. –Cement log evaluation showing poor cement in Liner jobs (typically 7” or less) more commonly ranging 3,000 to 4,500 mts depth and/or with cement slurry volumes ranging 30 to […]
Rheology: the key to cement coverage
One of the most important things we, as cementers, must understand is rheology. In our line of business, Rheology is the key to cement coverage and zonal isolation; the solely goal of well cementing. However, as simple as this true can be, it is amazing how easily it is underestimated and sometimes totally ignored in […]
Synthetic Vs. Organic. Which retarder is better?
In my experience bio based oil well cement retarders do not provide the consistency needed to accurately control thickening time in oil well cements. The main reason is that natural organic retarders production varies from lot to lot and batch to batch. Down-hole conditions, process control and small variations in cement quality; all play a major […]
What is expected in a well cementing proposal?
Job objectives: the main aims or goals of the cement job. Background information: the major challenges and concerns. Especially any adverse experience on offset wells, best practices and lessons learned. The job method and design, e.g., 2 stage, inner string, top and bottom plug, reverse circulation, TOC, WOC, etc. How is the job method allowing […]
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