3D Modeling of Fracture Initiation From Perforated Noncemented Wellbore
- Olga Alekseenko (Schlumberger) | Dmitry Potapenko (Schlumberger) | Sergey Cherny (Institute of Computational Technologies, SB RAS) | Denis Esipov (Institute of Computational Technologies, SB RAS) | Dmitry Kuranakov (Institute of Computational Technologies, SB RAS) | Vasily Lapin (Institute of Computational Technologies, SB RAS)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- June 2012
- Document Type
- Journal Paper
- 589 - 600
- 2012. Society of Petroleum Engineers
- 2.5.1 Fracture design and containment
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- 648 since 2007
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A 3D numerical model of fracture initiation from a perforated wellbore inlinear elastic rock is developed, which allows one to determine thefracture-initiation pressure (FIP) and the location and direction of an initialrupture. The model assumes that the fracture initiates at the point at whichthe local maximal tensile stress exceeds the rock tensile strength. The 3Dboundary-element method (BEM) is used for stress analysis.
The model aims to predict the location of initial fractures and thedifference in FIP between different perforation intervals in arbitrarilyoriented noncemented wellbores. There are many practical applications for thisknowledge, but of particular interest for this research is the employment ofdifferently oriented perforations for creating heterogeneity of FIP betweenwellbore intervals in multistage fracturing treatment. This can enablestimulation of these intervals in a sequential mode and significantly simplifycurrent treatment diversion and completion practices.
Comprehensive analysis revealed that the main parameter that can be used forcontrolling FIP during multistage fracturing treatment is the angle between thedirection of the perforation channel and the preferred fracture plane (PFP).The model allows obtaining the range of the angles that is the most suitablefor designing and implementation of diversion between the perforated wellboreintervals. The influence of geometrical parameters of perforation (such aslength, diameter, and shape) on FIP is substantially less. In addition, wefound that against all expectations, increase of perforation diameter canresult in higher FIP. It was also discovered that the influence of theintermediate in-situ stress on FIP is comparable with the effect of perforationmisalignment, especially in the situation of a horizontal wellbore and properlyaligned perforations. On the basis of the model developed, an approximateapproach to the evaluation of the effect of wellbore cementation on fractureinitiation was suggested. It was discovered that taking into account the stateof stress within the cement before well pressurization can result in both anincrease and a reduction of FIP, depending on the parameters of perforating andthe wellbore orientation.
The presented model is a necessary step toward predictable and controllablefracture initiation, which is vital for multistage-fracturing-treatmentdiversion.
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