Industry Article: Approach Optimizes Frac Treatments

Approach Optimizes Frac Treatments
Publication: American Oil & Gas Reporter
Publication Date: 07/01/2011

Geologic, well log, surface seismic and microseismic data were integrated using advanced reservoir modeling software to enable real-time completion optimization of multiple laterals drilled from the same well pad in a Barnett Shale project.

The laterals are spaced as close as a few hundred feet laterally with varying vertical landing points. Although the laterals expose more of the nanoDarcy-permeability shale rock and increase contact area through fracture stimulation (resulting in more efficient drainage), the challenge is optimizing stimulation treatments to maximize coverage around each lateral. The optimization process involved perforating and stage placement, sequential stimulation of the laterals, fluid and proppant schedules, treatment rates, and applying diversion technology when appropriate to achieve effective stimulation along the laterals and between the wells.

Opportunities to make changes to original designs were seized when injectivity problems were encountered early in the treatment process. This approach was executed successfully to gain injectivity and increase the conductive fracture area, allowing fracs to be managed in real time.

Observed fracture pressure responses and production from the pad wells validates the approach. Ultimately, an optimal horizontal stimulation was achieved by leveraging favorable rock properties to create a larger fracture surface contact area, thereby maximizing gas production potential and recovery.

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