BSP previously used a wellhead system that encountered problems with debris, which led to 959 hours of nonproductive time (NPT). SLB recommended the Cameron SOLIDrill™ modular compact wellhead system, which maximized uptime and reduced debris in the wellhead.
From 2014 to 2018, BSP used a wellhead system that recorded multiple issues, resulting in 959 hours of NPT in the Champion West field in Brunei. Most of the failures were attributed to debris accumulation in pockets between the hangers and the housing.
The prior wellhead system was a single load shoulder design or a stack system. Internal components were installed atop each other. The system did not tolerate enough debris because inherent system pockets allowed debris accumulation. This prevented hangers from properly landing and hindered setting the pack-off (casing hangers and pack-offs not fully landed can lead to issues in the landing of the tubing hangers). This impeded setting the subsequent tubing hanger as intended. A misalignment of approximately 0.3° and upward movement of more than 3―4 mm leads to these issues being encountered. Consequently, the hanger tilted and the operator faced challenges retrieving the running tools (excessive pulling loads).
SLB recommended the Cameron SOLIDrill modular compact wellhead system for its versatile and proprietary debris-tolerant design that maximizes drilling uptime and reduces costs. The system increases casing and tubing hanger landing reliability and helps prevent debris from entering the wellhead. It incorporates an independent shoulder design that isolates stages and prevents the tilting of one component to affect installation of other components. The tubing hanger and casing hanger seal assembly incorporates an inward bias lockdown mechanism that prevents debris accumulation behind the lockring, making the workover more reliable and lowering related NPT.
Eight SOLIDrill systems have been installed since May 2021 with 29 additional systems planned by BSP. BSP has recorded 0 NPT related to debris by using the SOLIDrill system.
