Well intervention

Extensive Well-Testing Operations Provide Insight Into Khuff Reservoirs

The interpretation of well tests, combined with petrophysical analysis, formation-test data, and production logs, provided insight into Khuff reservoirs.

Abu Dhabi landmarks
Helicopter point of view of Abu Dhabi skyline with surrounding area.
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An extensive appraisal campaign was performed in the Khuff reservoirs offshore Abu Dhabi, with multiple appraisal wells drilled in different fields. Those wells were evaluated using detailed logging campaigns and then subjected to well tests, usually through drillstem testing for targeted intervals. The interpretation of well tests, combined with advanced petrophysical analysis, formation-test data, and production logs, provided insight into the nature of the Khuff reservoirs. A wide range of responses was observed, from tight to highly productive, but not necessarily with clear previous indications of deliverability or inflow intervals.

Overview of the Khuff Formations

The key characteristics of the Khuff formations offshore Abu Dhabi have been well-documented in previous work and can be summarized by the following:

  • Low porosity and permeability carbonate reservoirs, where natural fractures are critical contributors to flow
  • Properties vary widely laterally, with significant uncertainty regarding connectivity
  • Variations in stress and petrophysical properties can be significant and affected by diagenetic and tectonic history

These reservoirs present significant challenges for development planning.

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