Abstract
The primary objectives of well construction are to maximize reservoir deliverability, reduce remedial operations, and minimize nonproductive time (NPT) during the drilling and cementing process. Challenges associated with designing and delivering dependable barriers in deepwater environments include low bottomhole circulating temperatures (BHCTs), temperature variance, narrow pressure margins, annular pressure buildup (APB), etc. Cementing operations in these conditions should be engineered such that the equivalent circulating density (ECD) does not exceed the fracture gradient during cement-slurry placement. Additionally, lost circulation materials (LCMs) should be incorporated into the cement slurry to help control loss zones. This paper discusses the field implementation procedures and the cement-slurry design tailored for deepwater wells in offshore Brazil, which helped minimize risks and achieve the zonal-isolation objectives for extending the life of the well.
