AAPG/SPE Africa Energy and Technology Conference

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Increasing Operational Efficiency in Extreme Extended Reach, Offshore Wells - A Case Story from Middle East


Objective A case story will be presented covering an extreme extended reach offshore well. In this case story two SSD's were opened in a single run on e-line, an outstanding achievement due to the ID restrictions and depth of the well. The paper will review the planning, operation, achievements and the lessons learned. Methods, Procedures, Process Due to the well going on total losses during the workover, a closed system was deployed to enable the operator to position and set the hydraulic packers. The packers are utilized for zonal isolation, with each of the two zones having two SSD's, in which one SSD per zone was required to be opened to allow access to formation. The selected solution was an electric over hydraulic toolstring consisting of tractor, stroker and selectable shifting tool to address the profile in the SSD. The operator was using the service provider for other interventions and decided to challenge them with opening 2 SSD's in one run while not shifting the adjacent SSD's. The challenging underlying economics of the industry has created a powerful driver for operator to find alternative cost effective intervention methodologies. The operation covered in this case provided just such improvements to the client: by utilizing electric line intervention tools the operator negated the requirement for a larger footprint coiled tubing intervention. Results & Conclusions A System Integration Test (SIT) was completed onshore prior to mobilization, where multiple shifts were successfully executed using a single set of shifting key pads. Test results were then repeated offshore, completing two interventions in a single run. The SSD's were successfully opened at ∼12,000 ft MDRT and ∼8,000 ft MDRT, respectively while leaving the two adjacent SSD's in the closed position. Results, client objective was 100% achieved using electric line, enabling the client to move forward with similar well designs having the confidence that a safe, reliable electric line solution is available. Additional results include reduced HSE risks as the e-line approach eliminated the use of a heavier CTU. The paper will also cover some lessons learned as debris in the profile and tubing caused some challenges. Novel/Additive Information This operation shows how the industry is constantly trying to improve on existing methods in order to be more efficient, safe and cost effective.