Improved operational performance results in drilling well 16 percent faster than plannedDownload PDF
Optimize drilling performance and eliminate wellbore stability
Southern Oman (Karim Small fields)
Halliburton Project Management (HPM) was tasked with optimizing the drilling performance of Medco Arabia Ltd. in its development drilling campaign in the Karim Small Fields (KSF) region of southern Oman. This project included providing engineering and operational support. A creative and optimized solution was needed to reduce the drilling time and overall well cost. Considerable collaboration with the customer and detailed offset well data analysis would be needed to determine the appropriate solution to meet project requirements at the lowest cost possible.
The operational performance of previously drilled wells in the KSF region was affected by a high record of non-productive time (NPT). The majority of this NPT (66.1 percent) was attributed to wellbore instability problems such as tight-hole and stuck-pipe events experienced in an 8 1⁄2-inch hole section. NPT of 143 hours was recorded while tripping out with an 8 1⁄2-inch bottomhole assembly (BHA) in Well “A”. The HPM team would need to analyze data, coordinate with Halliburton product service lines (PSLs), and implement a solution at the lowest cost possible.
To optimize drilling performance and reduce overall well costs, the HPM team first performed a detailed offset data analysis. In addition, other Halliburton PSL teams were brought in to analyze the data and offer solutions. An overall collaborative solution was then created.
Drilling engineering software from Halliburton Landmark was utilized to understand the drilling geomechanical events and to calculate the optimum drilling and tripping parameters. The Sperry Drilling Pressure-While-Drilling™ (PWD) tool was used to confirm the hydraulic models and to measure the amount of surge and swab pressure exerted over the formation due to excessive reaming actions. Baroid sized BARACARB® bridging agents were implemented in the drilling fluid system to enhance wellbore stability.
A detailed report was presented to Medco Arabia Ltd., with the following recommendations:
Faster drilling than planned
NPT related to wellbore stability issues
Of the total planned well cost saved
Stuck-pipe events after procedures were implemented
Through close collaboration with the customer, Halliburton was able to engineer a solution for ultimate drilling performance optimization.