Schlumberger

CHFR-Plus and CHFR-Slim Cased Hole Formation Resistivity

Measure deep formation resistivity behind steel casing to detect and evaluate bypassed hydrocarbons

The family of CHFR cased hole formation resistivity tools provides deep-reading measurements of true formation resistivity (Rt) from behind steel casing. The CHFR-Plus tool provides improvements in 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 determination behind casing

Saturations determined from resistivity measurements by the CHFR-Plus and CHFR-Slim tools 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 to reach beyond the invaded zone.

Combining CHFR resistivity and nuclear measurements delivers an enhanced saturation evaluation that is equivalent to an openhole interpretation. The large dynamic measurement range of the CHFR-Plus and CHFR-Slim tools provides detailed information in reservoirs with low porosity and low formation salinity, which are typically difficult to assess with conventional cased hole logging.

Logging where openhole conditions were unstable

Logging with the CHFR-Plus and CHFR-Slim cased hole formation resistivity tools provides critical primary information in wells that had to be cased before openhole logs could be run. Subsequent applications for reevaluating existing producing wells include bypassed reserves identification, characterization for reservoir management, sweep efficiency optimization to improve production, and decision making for recompletion design and sidetrack placement.

 

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Casing Focuses the Current, Deep into the Formation

Cased Hole Formation Resistivity ToolCHFR-Plus measurements
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