Abstract
The target of the work was to determine the safe operating mode for the injection wells to prevent the propagation of hydraulic fractures beyond the target interval into a cup rock in environmentally sensitive offshore oilfield. The ranges of injection pressures and rates as well as monitoring techniques to ensure a cap rock integrity based on geomechanics was defined.
The following steps have been taken to achieve the objectives:
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retrospective analysis of injection history;
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analysis of injection tests performed at selected wells;
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analysis of the evolution of closure pressure, friction pressures and fracture net-pressure;
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calibration of existing mechanical earth model to account for actual geomechanical state at specific point of injection history;
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modeling of self-induced hydraulic fractures in novel state-of-the-art planar 3D fracture simulator;
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comparison of fracture height with independent estimation methods such as DTS, SNL and others;
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sensitivity analysis of various injection modes.
Our research has shown that previous injection modes have caused propagation of self-induced fractures. In addition, modeling such fractures in the novel planar 3D fracture simulator has excellent convergence with observations of DTS and SNL studies, and shows no fractures propagation beyond the interval of interest. The application of this approach makes it possible to assess the risks associated with top-seal integrity during water injection in the long terms.
Use of the latest simulator based on the advanced planar 3D model to simulate the development of self- induced fractures coupled with DTS and SNL monitoring methods proves viability of top-seal integrity control. The study of fall-off tests at different stages of long-term injection allows to determine the current stress-strain state.
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Berezenkov, D.V., Klyubin, A.A., Gaysina, N.R., Lisitsyn, A.I., Melkov, A.E., Bochkarev, A.V. (2024). Identification of Safe Injection Modes for Injection Wells. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2023. IFEDC 2023. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-97-0260-2_139
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DOI: https://doi.org/10.1007/978-981-97-0260-2_139
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