Parameters controlling pressure and fracture behaviors in field injectivity tests: A numerical investigation using coupled flow and geomechanics model |
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| Institution: | 1. Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;2. Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong 2522, Australia;3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China;2. McDougall School of Petroleum Engineering, University of Tulsa, OK, USA;3. Mackay School of Earth Sciences and Engineering, University of Nevada, Reno, NV, USA;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071 Hubei, China;2. Mackay School of Earth Sciences and Engineering, University of Nevada, Reno, 89557, NV, USA;1. Department of Civil and Environmental Engineering, Geotechnical Engineering Center, University of Alberta, GeoREF/GeoCERF, 6-380 Donadeo Innovation Centre for Engineering, Edmonton, Alberta, Canada T6H 1G9;2. Reservoir Geomechanics Research Group, University of Alberta, Edmonton, Alberta, Canada;3. Department of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, Montreal, Quebec, Canada;4. Foundation CMG Research Chair in Reservoir Geomechanics for Unconventional Resources, University of Alberta, Rm 6-222 Donadeo Innovation Centre for Engineering, Edmonton, Alberta, Canada T6G 1H9;5. Faculty of Civil Engineering, Department of Structural Engineering, K.N. Toosi University of Technology, Tehran, Iran;1. Selçuk University, Department of Mining Engineering, Turkey;2. Dumlup?nar University, Department of Mining Engineering, Turkey |
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| Abstract: | Field injectivity tests are widely used in the oil and gas industry to obtain key formation characteristics. The prevailing approaches for injectivity test interpretation rely on traditional analytical models. A number of parameters may affect the test results and lead to interpretation difficulties. Understanding their impacts on pressure response and fracture geometry of the test is essential for accurate test interpretation. In this work, a coupled flow and geomechanics model is developed for numerical simulation of field injectivity tests. The coupled model combines a cohesive zone model for simulating fluid-driven fracture and a poro-elastic/plastic model for simulating formation behavior. The model can capture fracture propagation, fluid flow within the fracture and formation, deformation of the formation, and evolution of pore pressure and stress around the wellbore and fracture during the tests. Numerical simulations are carried out to investigate the impacts of a multitude of parameters on test behaviors. The parameters include rock permeability, the leak-off coefficient of the fracture, rock stiffness, rock toughness, rock strength, plasticity deformation, and injection rate. The sensitivity of pressure response and fracture geometry on each parameter is reported and discussed. The coupled flow and geomechanics model provides additional advantages in the understanding of the fundamental mechanisms of field injectivity tests. |
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| Keywords: | Field injectivity tests Fracture modeling Cohesive zone method Parametric study |
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