This paper presents an overview of switching from rig-based sand control pumping equipment to a semipermanent vessel-based pumping setup. The design, installation, and implementation of a fracturing vessel for subsea sand control and stimulation will be covered in detail. The approach taken includes an analysis of benefits and drawbacks associated with rig-based and vessel-based pumping setups as well as the design and implementation of a vessel-based fracturing package. Additional topics discussed include determining specifications for appropriate vessel selection and best practices for vessel layout design to maximize the pumping fleet functionality while minimizing the health, safety, and environmental (HSE) exposure.
We analyzed a case study in which a fracturing fleet based on a platform supply vessel (PSV) was implemented in place of rig-based equipment. Use of the methodology described here eliminated 17.7 rig days, 1540 offshore lifts, 46 helicopter flights, and 55 supply vessel trips over 11 wells in a subsea campaign. Additionally, due to the enhanced mobility of the vessel-based equipment package, it was possible to service two rigs with a single fracturing fleet. The switch from rig-based to vessel-based equipment resulted in an average savings of USD 1.3 million per well including rig day rates, fracturing equipment rental, and other associated costs.