A Intro to Fracturing Small

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Introduction to Fracturing Duke Gray August 26th, 2010 Objectives ã Overview of fracturing ã Identify and explain porosity and permeability and how they relate to fracturing ã Identify the four principal parameters of fracturing design ã Explain effective wellbore radius (rw’) ã Introduce general hydraulic fracturing materials © 2006 Weatherford. All rights reserved. 1 Fracturing Overview ã Hydraulic fracturing involves the injection of fluids into the formation at a rate and pressure abov
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   Introduction to Fracturing Duke Gray August 26 th , 2010    © 2006 Weatherford. All rights reserved. 1 Objectives ã Overview of fracturing ã Identify and explain porosity and permeability and how they relate to fracturing ã Identify the four principal parameters of fracturing design ã Explain effective wellbore radius (r  w ’)   ã Introduce general hydraulic fracturing materials  © 2006 Weatherford. All rights reserved. 2 Fracturing Overview ã Hydraulic fracturing involves the injection of fluids into the formation at a rate and pressure above the fracture pressure of the reservoir in order to create a fracture within the rock itself. We then pack this space with proppant which:  – Improves productivity  – Interconnects formation permeability  – Improves EUR (Estimated Ultimate Recovery) ã In the case of the Barnett Shale, the goal is to connect the naturally fissured (fractured) portions with the wellbore to bypass damage due to drilling and cementing and to speed recovery of the hydrocarbons.  © 2006 Weatherford. All rights reserved. Propped Frac & Acid Frac 1/2 open fracture during job (frac width = w f  ) fracture tends to close once the pressure has been released sand used to prop the frac open acid etched frac walls
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