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Extended Well Tests

Extended well tests (EWTs) are used to evaluate productivity and characteristics of a reservoir. Clearly understanding the reservoir's potential helps operators reduce risks. In particular, EWTs are used to

  • estimate reservoir volume and confirm reserves for field development
  • confirm long-term reservoir deliverability
  • pilot future facility designs during actual field development
  • provide an opportunity to estimate interwell transmissibility and wellbore storage
  • verify static data dynamically
  • obtain additional production-related data, such as water cut, sand production, and well deliverability.

EWTs also provide a way to test sand control techniques and process- and production-related technologies. Such testing minimizes risks related to developing a field for long-term, sustained production.

Turning uncertainty into commercial success

Schlumberger can provide excellent, reliable solutions for your EWT objectives. Our reservoir, completions, production, and facilities engineers will design fit-for-purpose well testing and data acquisition, completion, and facilities solutions. Various commercial models are available to suit your needs:

  • design of extended well testing to comply with governmental safety regulations and standards
  • validation of seismic, geology, and petrophysical data
  • project management and engineering 
  • operations with maximum input from local experts
  • provision of sellable products using production facilities and/or conventional well testing equipment
  • downhole and surface data acquisition

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Reliable, Real-Time EWT Data Delivery—from 27,500-ft TD

WellWatcher Gulf
Schlumberger technology helped Chevron conduct an extended well test in an ultradeepwater, ultrahigh-pressure GOM reservoir—and delivered continuous real-time bottomhole data for 48.5 d. Read case study