Operational Challenges for Drilling Shallow Water Wells With Dynamically Positioned Rigs – Rohit Vaidya, Engineering Specialist, Houston

June 28th – July 3rd 2020  ⋅  Fort Lauderdale, Florida

Traditionally shallow water wells have been drilled from fixed platforms, jack-ups or moored drilling rigs. Recently there has been increased interest in performing operations on these wells using Dynamically Positioned (DP) rigs, driven either by excess available capacity of these rigs or environmental regulations that restrict laying anchors on the seabed. Shallow water offshore operations pose a set of unique challenges. These challenges are further amplified when operations are performed on older wells with legacy conductor hardware with newer DP vessels and larger BOPs.

The objective of the paper is to present challenges that occur during drilling in shallow water and discuss mitigation options to make these operations feasible.

Key challenges to optimizing riser operability and rig uptime are discussed. Potential modifications to the upper riser stack-up and rig deck structure for maximizing operational uptime are discussed. Riser system weak point assessment is presented along with solutions for mitigating risks in case the wellhead or conductor structural pipe is identified as the weak link. Selection of the drilling rig can have significant impact on wellhead fatigue response. Some criteria for rig selection based on drilling riser and wellhead system performance is presented with the objective of optimizing the fatigue performance of the wellhead and conductor system. Wellhead fatigue monitoring solutions in combination with physical fatigue mitigation options are presented to enable operations for fatigue critical wells.

More information: OMAE 2020

Operational Challenges for Drilling Shallow Water Wells With Dynamically Positioned Rigs – Rohit Vaidya, Engineering Specialist, Houston

June 28th – July 3rd 2020  ⋅  Fort Lauderdale, Florida

Traditionally shallow water wells have been drilled from fixed platforms, jack-ups or moored drilling rigs. Recently there has been increased interest in performing operations on these wells using Dynamically Positioned (DP) rigs, driven either by excess available capacity of these rigs or environmental regulations that restrict laying anchors on the seabed. Shallow water offshore operations pose a set of unique challenges. These challenges are further amplified when operations are performed on older wells with legacy conductor hardware with newer DP vessels and larger BOPs.

The objective of the paper is to present challenges that occur during drilling in shallow water and discuss mitigation options to make these operations feasible.

Key challenges to optimizing riser operability and rig uptime are discussed. Potential modifications to the upper riser stack-up and rig deck structure for maximizing operational uptime are discussed. Riser system weak point assessment is presented along with solutions for mitigating risks in case the wellhead or conductor structural pipe is identified as the weak link. Selection of the drilling rig can have significant impact on wellhead fatigue response. Some criteria for rig selection based on drilling riser and wellhead system performance is presented with the objective of optimizing the fatigue performance of the wellhead and conductor system. Wellhead fatigue monitoring solutions in combination with physical fatigue mitigation options are presented to enable operations for fatigue critical wells.

More information: OMAE 2020