Protecting the surface formations is very important to avoid facing any problems when drilling ahead to reservoir. The surface casing is cemented following a special procedure. It is cemented using the stinger which is made up on drill pipe and run to the surface casing shoe. The success of the operation is related to many points which have to be guaranteed before, during and after performing the cementing job.

Before the cementing job, the casing has to be checked, cleaned, measured and drifted. The casing tally has to be prepared. The setting depth has to be discussed with well site geologist to give the window where the casing shoe should be set. The casing running equipment should be on site, also the cementing crew, unit and products should be on site. The jet cellar or electrical pump should deliver a pumping rate equals or more than the expected cementing flow rate. It has to be checked and tested before starting drilling the surface section.

Cementing Stinger Applications
Through drill pipe cementing has several advantages.

🔹Accurate hole volumes & cementing calculations (most often unknown in a conductor or surface holes) are not required, because the cement slurry is mixed and pumped until returns are observed at the surface.
🔹This procedure optimizes the total volume of cement mixed and pumped and virtually eliminates the possibility of over displacement because the subsequent volume displaced from the drill pipe is negligible.
🔹This method also eliminates the need for large-diameter swages or cement heads, as well as large casing wiper plugs.
🔹Also, minimal cement contamination occurs during through-drill pipe cementing.
Cementing Stinger Risks & Disadvantages