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Geomechanics and Engineering Volume 5, Number 5, October 2013 , pages 463-483 DOI: https://doi.org/10.12989/gae.2013.5.5.463 |
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Perforation optimization of hydraulic fracturing of oil and gas well |
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Hai Yan Zhu, Jin Gen Deng, Zi Jian Chen, Feng Chen An, Shu Jie Liu, Cheng yong Peng, Min Wen and Guang Dong
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| Abstract | ||
| Considering the influences of fluid penetration, casing, excavation processes of wellbore and perforation tunnels, the seepage-deformation finite element model of oil and gas well coupled with perforating technique is established using the tensile strength failure criterion, in which the user-defined subroutine is developed to investigate the dynamic evolvement of the reservoir porosity and permeability. The results show that the increases of perforation angle and decreases of perforation density lead to a higher fracture initiation pressure, while the changes of the perforation diameter and length have no evident influences on the fracture initiation pressure. As for initiation location for the fracture in wellbore, it is on the wellbore face while considering the presence of the casing. By contrast, the fractures firstly initiate on the root of the tunnels without considering casing. Besides, the initial fracture position is also related with the perforation angle. The fracture initiation position is located in the point far away from the wellbore face, when the perforation angle is around 30 | ||
| Key Words | ||
| perforation parameters; finite elements; initiation pressure; hydraulic fracturing | ||
| Address | ||
| 1) Hai Yan Zhu, Jin Gen Deng and Zi Jian Chen: State Key Laboratory of Petroleum Resource and Prospecting (China University of Petroleum), Beijing 102249, China; 2) Hai Yan Zhu and Feng Chen An: School of petroleum engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 3) Shu Jie Liu, Cheng yong Peng and Min Wen: School of Engineering and Electronics, Edinburgh University, Edinburgh EH9 3JN, UK; 4) Guang Dong: CNOOC Research Institute, Beijing 100027, China. | ||