Hydraulic Fracturing has always been referred to as a multidisciplinary technique for delivering improved well productivity. In the BP exploration business operation, a successful hydraulic fracturing operation is a key requirement for cost-efficient well project delivery. With formation rocks requiring in excess of 18000 psi bottom-hole treating pressures, reservoirs with contrasting formation pressure regimes, complex stress profiles and the need for multi-zone commingled completions as business drivers, significant challenges arise in terms of down hole equipment limitations, increased complexity in completion installations, high project costs and diminished assurance of fracture pumping completion success.
An innovative well completion design and a thorough multidisciplinary planning strategy dramatically improved operating efficiency and successfully enhanced well productivity for the Guadalupe sands in BP Colombia operations. The system was implemented in the Floreña C6 well in the Piedemonte Field in Colombia. The completion installation technique also represented the "first of a kind" globally and sets the pace for the future completion work to be undertaken in the Piedemonte Field.
This paper comprehensively describes the total system approach implemented in various disciplines and the strategic planning applied to overcome critical obstacles in the well delivery process; optimizing project costs and creating increased assurance for the hydraulic fracturing operations resulting in a remarkable well performance.
BP Exploration (Colombia) operates on behalf of its partners a group of fields in the foothills of the Eastern cordillera of the Andes in the department of Casanare in Colombia. See map (Fig 1)
Production started in the mid 1990's and it became apparent early in the development that despite the relatively high reservoir permeability, satisfactory productivity could not be achieved in most wells without hydraulic fracturing (ref 1).
It was possible to frac some wells, mainly in the Cusiana field, through the completions, but the treating pressures in the other fields were usually too high to allow this procedure, and therefore hydraulic fracturing was performed through frac strings with a rig on location.
Due to potentially high productivities many wells were completed with 7" completions and an approach of running high pressure 4.5" frac strings through the 7" completions was successfully adopted (ref 2). Over the period 1999–2004 this approach became standard when high productivity was anticipated, resulting in a very successful fracturing campaign.