| Popis: |
Rock deformation and fracturing is an important causal mechanism that can compromise well integrity. Geomechanical simulation is a valuable tool to investigate this mechanism and connect well tubular designs with reservoir development strategies. Utilizing relevant field examples, this paper describes a work flow in these regards.Two example simulation approaches are described. One is to use a composite casing/cement/rock model in a reservoir of complex geology to compute maximum strain, dogleg severity, and ovality/restriction in the casing along the well trajectory. Different well design parameters, such as casing size, grade, and cement thickness, can be iterated against different reservoir production strategies. All these efforts are to arrive at an optimized design. The other approach is to calculate localized shear displacement along a weak plane that will be imposed on well tubulars during reservoir activities. The resulting design is optimized by altering well placement and stimulation/production schedules.The above workflow has been proven in various field applications. Experience is shared in this paper. It is hoped this work can demonstrate that the optimal management of well integrity can be achieved by an integrated approach that designs appropriate tubulars and adjusts reservoir activities. Placing well tubulars in the context of rock deformation, geomechanical simulation is the best tool to connect the reservoir activities with the well tubular designs and therefore, can potentially offer a cost-effective well integrity management program. |
