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Technical Paper: The Pressure-Dependence Ratio: A Bottomhole Treating Pressure Diagnostic Tool for Hydraulic Fracturing in Tight, Naturally Fractured Reservoirs

Society: SPE
Paper Number: 77916
Presentation Date: 2002
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Abstract

As we continue to develop the processes of hydraulic fracturing in tight, naturally fractured reservoirs, so continues our development of more effective bottomhole treating pressure (BHTP) diagnostics. New diagnostic techniques need to reflect the physical processes and give insight to potential damage mechanisms prevalent during hydraulic fracture treatments in complex reservoirs.

The placement and effectiveness of a hydraulic fracturing treatment in a naturally fractured reservoir is dependent on the extent pressure responses, leakoff behavior, and possible damage of the natural fracture system under bottomhole stimulation conditions. Often, the only consistent diagnostic technique applied within a field development and hydraulic fracturing operations in tight, naturally fractured reservoirs is analysis and history matching of BHTP values. Such was the case during a seven-well completion program in the Barnett Shale Fort Worth basin, Texas.

In this paper we provide a thorough evaluation of BHTP trends observed during fracturing treatments performed in the Barnett Shale—a naturally fractured shale reservoir. From this evaluation we are able to propose a new, more effective tool that can be combined with other BHTP and fracturing diagnostic techniques. Further, this analytic technique is easily adaptable to the treatment of other tight, naturally fractured reservoirs to enhance design or onsite decisions.

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