Hydraulic Fracture Initiation and Propagation from Wellbore with Oriented Perforation
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- 作者：Haiyan Zhu ; Jingen Deng ; Xiaochun Jin ; Lianbo Hu…
- 关键词：Hydraulic fracture ; Fracture initiation ; Fracture propagation ; Oriented perforation
- 刊名：Rock Mechanics and Rock Engineering
- 出版年：2015
- 出版时间：March 2015
- 年：2015
- 卷：48
- 期：2
- 页码：585-601
- 全文大小：3,235 KB
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- 刊物主题：Earth sciences
Geophysics and Geodesy
Civil Engineering - 出版者：Springer Wien
- ISSN：1434-453X
文摘
Considering the influence of casing, analytical solutions for stress distribution around a cased wellbore are derived, based on which a prediction model for hydraulic fracture initiation with the oriented perforation technique (OPT) is established. Taking well J2 of Z5 oilfield for an example, the predicted initiation pressure with the OPT of our model is about 4.2?MPa higher than the existing model, which neglects the influence of casing. In comparison with the results of laboratory fracturing experiments with OPT on a 400?×?400?×?400?mm3 rock sample for a cased well with the deviation of 45°, the fracture initiation pressure of our model has an error of 3.2?%, while the error of the existing model is 6.6?%; when the well azimuth angle is 0° and the perforation angle is 45°, the prediction error of the fracture initiation pressure of the existing model and our model are 3.4 and 7.7?%, respectively. The study verifies that our model is more applicable for hydraulic fracturing prediction of wells with OPT completion; while the existing model is more suitable for hydraulic fracturing with conventional perforation completion.