This post provides additional information for those who need more detail regarding cement slurry contamination. This is a follow-up post to previous posts where we covered fluids intermixing (as in liner cementing and rheology in primary cementing). What are the consequences of contamination? Poor Cement Log Evaluation: Cement log evaluations can show poor cement in Liner […]
What is Rheology? Key to Cement Coverage
What is Rheology? One of the most important things we, as oilwell cementers, must understand is rheology. In our line of business, Rheology is the key to cement coverage and zonal isolation; which is the sole goal of well cementing. However, as simple as this can be, it is incredible how easy it is underestimated and […]
Cement Retarders: Synthetic Vs. Organic
In my experience, bio-based oil well cement retarders do not provide the consistency needed to control thickening time accurately. (This is at least, the case among types of cement used in oil wells). The main reason is that the production of natural organic retarders varies from lot to lot and batch to batch. The problem with organic […]
What is expected in a well cementing proposal?
Well cementing proposal checklist: The following eleven points form the basis of a sound well cementing proposal. For unique circumstances, there will be additional points for planning and consideration. Job objectives: the main aims or goals of the cement job. Background information: the significant challenges and concerns. Especially any adverse experience on offset wells, best […]
Drill deeper or just plug it off?
A quick reminisce… Before we drill deeper into the topic, first an introduction. Over the years, I have had the opportunity to work with many drilling teams. I have to say, some of them still occupy a very special place in my heart. Not only because of the quality of the people I had the […]
Balance to succeed: Cement Plugs in losses situation
Loss circulation challenges This is a short article focusing on one topic: the balanced plug. During my time in Mexico, one of the main challenges That we faced was severe loss circulation. In new wells, due to the presence of fractured carbonates and low formation pressure (LPHT), several actions were usually in place. Examples include […]
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