Technical Paper: Optimizing the Completion of a Multilayer Cotton Valley Sand Using Hydraulic Fracture Monitoring and Integrated Engineering

Society: SPE
Paper Number: 110068
Presentation Date: 2007
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Microseismic hydraulic fracture monitoring is having a major impact in how wells are being completed in tight sand reservoirs. This existing technology is being utilized in new and innovative ways to provide operators a clearer picture of the fracture development. This information can be combined with other fracture diagnostic techniques, and along with sound engineering practices, can have a profound impact on how wells are completed.

This paper discusses the completion design methodology, execution, and results from two offset wells. The first well was completed with a two stage hydraulic fracture treatment while the successive offset was completed via a single-stage fracture treatment. The evaluation tools utilized to determine the resultant fracture attributes include microseismic hydraulic fracture monitoring, hydraulic fracture surface treating pressure-history matching, and tracer and production log interpretation in addition to production analysis. The results from each well are compared and contrasted, and a plan for potential future completions is discussed.

The microseismic event growth and fracture treating pressures over time revealed how the fracture propagated. In the first well the microseismic and treating pressure results of the first stage showed height growth into the proposed zone to be targeted by the second stage treatment. Lessons learned from the first subject well were then incorporated into the completion design of the offset well to optimize its overall completion efficiency. The second well was hydraulically fracture stimulated with a single stage treatment. The completion design changes incorporated in the second well showed some positive effects on the microseismic fracture geometry and resultant production.

An integrated analysis approach can provide an improved understanding of the fracture behavior within a field. This improved knowledge of the fracture system can lead to optimum completion designs and well spacing. These changes can then themselves be evaluated with the aforementioned tools to determine their level of success. This continuous improvement process can be repeated for future fieldwide well completion designs in order to achieve an optimum fracture system within the targeted intervals.