Influx zone characteristics These wells may show high dogleg severity in the intermediate section. Depending on the type of formation drilled across, there could be a tendency to form sort of keyseats, not only low side but also high side. They tend to get worse with additional drill string work, such as trips, reaming or circulation. […]
Cement Slurry Contamination: Prevention
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 […]
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 […]
Primary Cementing Checklist (Customer)
Before we delve into the primary cementing checklist, imagine that you are the person in charge of well construction operations. It is nighttime, and the company man is resting (contrary to ‘normal’ people, a co-man needs noise to properly rest, because noise means that ‘all is working’). As a junior or night well site leader […]
Wiper Plugs – Why Don’t They Always Bump?
Everybody knows why bumping the top of wiper plugs at the end of the displacement is an essential element of each successful primary cement job. It ensures only the shoe track is left with cement, and; It allows the pressure testing of the casing. First of all, a couple of questions for you: What is […]
Recent Comments