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Using Low Density Tracers to Evaluate Acid Treatment Diversion

Reid, Mark, Coastal Oil & Gas Corporation; Holcomb, David, ProTechnics International, Inc.; Waak, Kyle A., Atlas Wireline Services, Western Atlas International

Utilizing a newly developed low density zero wash tracer carrier (1.1 - 1.5 gm/cc), acidizing treatments performed across large gross intervals consisting of thinly laminated carbonate/ sand stone reservoirs have been more accurately diagnosed with respect to placement efficiency. Multi-isotope tracer in combination with spectral gamma ray logs are used to evaluate and optimize acid treatments involving various diverting processes (i.e., rock salt/benzoic acid; ball sealers). Acid diverter treatments are evaluated using multi-tracer spectral gamma ray logs and subsequent efficiencies shown. A new low density tracer carrier that allows more effective, safer transport and placement of the isotopes was used and significantly improved the log interpretation. Example case histories of acid treatments evaluated using the new low density tracer carrier will be presented for treatments done in Utah, U.S.A.

(1) Acid treatments performed in long multi- perforated intervals using various diverting techniques were shown to have different coverage distribution than expected or indicated by treatment pressures.

(2) A new low density tracer carrier provides a clearer log definition where multi-isotopes are used to define acid stage and diverter stage distribution.

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