.pdf asset-performance field_planning_color fit_for_purpose_color production_optimization_recovery_color kpi-box kpi-money kpi-time ::before

An operator developing a deepwater field in Central Africa needed to drill an extended-reach well intersecting two reservoir compartments and complete it for commingled production. A key challenge of the project was to to design the best completion based on fluid characterization from each reservoir, and calculate how much each reservoir would contribute to total production.

Incomplete data could lead to suboptimal drainage of the intersected reservoirs, impacting the profitability of the project. Traditionally, to meet these objectives, the operator would use a wireline-conveyed testing and sampling service to acquire fluid samples and measure formation pressures and fluid properties. However, due to the challenging well profile, this option was unfavorable as it would require a lengthy and risky pipe-conveyed logging operation.

To meet the operator’s fluid evaluation objectives, Baker Hughes, a GE company (BHGE), proposed using the FASTrak™ Prism fluid analysis and sampling while drilling service. The FASTrak Prism service—the latest in the FASTrak suite of technologies—improves the speed and reliability of fluid identification. The service delivers comprehensive downhole fluid properties and measurements in realtime to enable in-situ reservoir characterization and the efficient capture of high volumes of representative fluid samples. The service also provides real-time formation pressure and mobility data for increased reservoir knowledge, enhanced drilling efficiency, and improved wellsite safety.

Working closely with the operator, BHGE developed a holistic plan that provided a complete formation evaluation suite while drilling, and that eliminated the rat hole in the same drilling run. The FASTrak Prism service collected multiple samples in each reservoir, meeting the operator’s requirements for fluid volume and number of samples, and performed 33 formation pressure tests.

Download the PDF to read the full case study.

Challenges & Results


  • Eliminate rig time and deployment risks associated with pipe-conveyed wireline sampling
  • Comingle production from two reservoirs while accessing as much hydrocarbons as possible from each
  • Obtain high-quality, single-phase samples and formation pressure tests from each reservoir


  • Helped save 48 hours rig time
  • Acquired representative samples and formation pressures in a single drilling run
  • Eliminated borehole stability risk by reducing openhole time
  • Exceeded the initial production target by more than 30%