Development of Guidepost Based Wellhead Load Relief System (GP-WLR)

Abstract

This paper describes the development of a novel wellhead load relief system improving operational aspects and wellhead fatigue management achieved by an unconventional utilization of existing equipment. The objective is to provide insight in a newly developed technology for Wellhead Fatigue mitigation with the potential to become a future element in fatigue management. The operational aspect is appealing as this system is effective with remotely operated hook-up and a minimum of additional equipment needed. The development of the system started in 2015 during planning of several exploration wells and have continued as a cooperation between the drilling and subsea disciplines within Equinor. The Guidepost Well Load Relief (GP-WLR) seeks to be a load reduction and operational effective wellhead load relief system through integration of WLR functionality with existing BOPs and redirecting well load thru guideposts and subsea structures already present. The GP WLR system is modular which provides for flexibility in finding a way of adding it to legacy equipment. The basic idea of such a system is explained and then how the development has evolved internally in Equinor from idea, concept, prototype, and implementation. At this stage the GP-WLR technology has been used in operations by a subsea drilling Blow Out Preventer (BOP) and a Work Over stack. The effect and use of the system will be discussed in an operational perspective. The operation of the GP-WLR system is using remote access. Experiences gained during prototype testing and first-time use have shown that the GP-WLR system have worked as intended. The authors believe GP-WLR to be a significant contribution to the wellhead fatigue mitigation toolbox while reducing the risk for damage to equipment and personnel. GP-WLR will be a significant contribution to the wellhead fatigue management and allows optimizing drilling schedule while also reducing the risk for damage to equipment and personnel.