Measuring Deep Resistivity Behind Steel Casing
Detect and evaluate bypassed hydrocarbons with deep formation resistivity measurements
The CHFR cased hole formation resistivity tool gives you deep-reading resistivity measurements from behind steel casing. The CHFR-Plus version further improves the operational efficiency of cased hole resistivity measurements. The CHFR-Slim slimhole tool fits in casing as small in diameter as 2 7/8 in.
Improved saturation measurements
CHFR saturation measurements are significantly better than the data produced by pulsed neutron nuclear logging tools for behind-casing evaluation. The depth of investigation is between 7 and 32 ft (2 to 10 m), which is more than an order of magnitude deeper than nuclear measurements.
You can evaluate reservoirs with low porosity and formation salinity. Combine resistivity and nuclear measurements for enhanced saturation evaluation equivalent to an openhole interpretation.
Logging for a new evaluation
A California well was abandoned in 1998 when the water rate reached uneconomic levels at 1,600 bbl of water per day. In 2001, the well was reevaluated using the CHFR tool. The logs confirmed that an interval had watered out. They also identified hydrocarbons in another interval. A plug was set and the new interval was perforated. Following the workover procedure, the well produced 300-bbl/d oil B/D.
Two other wells also were logged with the CHFR tool with similar success. The operator produced a significant volume of oil from all three wells.
Identify zones for perforating
A North Sea operator needed to identify perforating zones to maximize oil production while minimizing water production. The CHFR tool was run after a 5 1/2-in liner was cemented. The log showed clearly that the uppermost sand interval remained unflushed. After perforation, this zone produced 12,000 bbl/d of dry oil.
Benefits
- Rig time savings from more efficient operations
- Identification of unswept reserves for extended field life
- Improved input for reservoir management
- Optimized sweep efficiency for improved production
- Better input for decisions on recompletions and sidetrack placement
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