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Technical Paper: Application of a Viscoelastic Surfactant-Based CO2 Compatible Fracturing Fluid in the Frontier Formation, Big Horn Basin, Wyoming

Society: SPE
Paper Number: 107966
Presentation Date: 2007
 Download: Application of a Viscoelastic Surfactant-Based CO2 Compatible Fracturing Fluid in the Frontier Formation, Big Horn Basin, Wyoming (0.59 MB PDF) Login | Register

 

CO2 based fluids are commonly used to fracture-stimulate formations with low reservoir pressure, as well as formations that are more sensitive to water treatments (high capillary pressure, swelling clays, etc.,). In particular, the Frontier formation located in Bighorn Basin, Wyoming, has seen a variety of stimulation fluids used over the past few years with varying degrees of success.

A novel viscoelastic surfactant-based CO2-compatible high foam quality (> 60 %) fluid was proposed as the main fracturing fluid. Unlike oil-based fluids it does not alter the wettability of a reservoir or cause formation damage. This paper highlights the first application of this viscoelastic-based fluid on two wells in Park County, Wyoming. 

We discuss stimulation with the new fluid and how pin-point pressure measurements enabled the operator to make informed decisions to define fracturing/completion strategy. We also present the additional benefits of incorporating existing dipole sonic tool information to calibrate in-situ stress, Young’s modulus, and Poisson’s ratio.

Finally, a production history match is conducted on wells treated with the new fluid. 

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