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SPE Liquids-Rich Basins Conference: New Technology for Old Plays (Part 2)

Photo courtesy of Apache Corporation.
Rig drilling on Stiles Ranch in the Granite Wash play in Wheeler County, Texas. Apache continues to work numerous plays across its 1.9-million gross acreage position in the Anadarko basin, focusing on the liquids-rich Granite Wash and the oily Tonkawa, Marmaton, Cottage Grove, Cleveland, and Canyon Wash plays.

Stimulation Design

Adequate stimulation is key to liquids-rich reservoir development. This session on stimulation-oriented topics placed particular emphasis on fracture complexity, effective fracture height, and other fracturing design parameters impacting production in liquids-rich systems.

Diagnostic Fracture Injection Testing (DFIT)

Dave Cramer, senior engineering fellow at ConocoPhillips, discussed the use of DFIT for characterizing liquids-rich unconventional reservoirs. The main objectives of DFIT are to acquire

  • Minimum in-situ stress (fracture closure)
  • Transmissibility (kh/µ)
  • Pore pressure (pi)

According to Cramer, “The process starts with the creation of a small hydraulic fracture, typically requiring less than 5 bbl for a shale gas interval. Injection volume depends upon your test objective and reservoir characteristics.”

In a DFIT response, one is looking for stable response. “Fracture closure is a progressive process,” he said. “What’s driving injection is fluid leak-off.”

One can model fracture geometry (Fig. 5) based on the flow regimes in hydraulically fractured wells with residual fracture conductivity. “Even with a small injection,” Cramer said, “reservoir investigation is significant.”

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SPE Liquids-Rich Basins Conference: New Technology for Old Plays (Part 2)

Robin Beckwith, Senior Features Editor

01 November 2013

Volume: 65 | Issue: 11

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