Predicting Breakdown Pressure and Breakdown Cycle in Cyclic Fracturing
- Ahmad Sakhaee-Pour (University of Houston) | Abhishek Agrawal (University of Oklahoma)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- November 2018
- Document Type
- Journal Paper
- 761 - 769
- 2018.Society of Petroleum Engineers
- Paris law, geomechanics, Cyclic fraturing
- 3 in the last 30 days
- 254 since 2007
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In hydraulic fracturing, large volumes of fluid and sand are injected into the formation to enhance its transport properties. In conventional fracturing, the fluid pressure is increased monotonically to reach failure in a single cycle. The breakdown pressure can be reduced if we increase and decrease the fluid pressure cyclically (cyclic fracturing). This phenomenon has been tested in other engineering fields, but it is not yet possible to predict the breakdown pressure and cycle in petroleum engineering in the context of hydraulic fracturing. In the present study, we propose a workflow that is based on a modified Paris law to predict the breakdown pressure and the number of cycles in cyclic fracturing. The modified Paris law is based on linear-elastic fracture mechanics (LEFM), which treats the solid domain as an isotropic and linear-elastic medium. We use the data available in the literature for dry Tennessee Sandstone. The samples were hydraulically fractured under triaxial stress, two with conventional and two with cyclic methods. The results show that the tuned Paris law can predict the breakdown pressure and cycle with a good accuracy. The tuned model can help us to design an optimal scenario that is fundamentally different from the conventional method for formation stimulation.
|File Size||1 MB||Number of Pages||9|
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