Precise Cementing Simulation
BDC offers an accurate simulation of the cementing and well abandonment process, focusing on operational safety and efficiency.
Oil & Gas (O&G) operations are known for their financial and operational risks. In regard to environmental regulations, an O&G well must comply not only with the restrictions for its operational life, but also to those conceived for its decommissioned life.
Down to the reservoir, modeled through hoses, risers, tubulars, completions and rock formation. Different models of fluids are considered, such as biphasic fluids, cement paste and cement/foamed fluid. Changes in Well Injectivity are computed based on the pressure reservoir response (Finite Element Model) along with cake formation, which depends on the adopted filter cake model. Thermodynamic effects are also addressed during the operation, considering heat exchange between well components and reservoir, including fluids, casings, and rock formation.
The first case consisted of plugging with conventional cement paste, while the second case utilized foamed fluids to plug a partially collapsed well.
From the first case graphical analysis (Figure 3), it can be seen that the percentage difference was less than 2% for most of the operation, reaching only a little over 4% at the end. Small differences are normal due to the uncertainties of the field data. It is considered that the results obtained by the simulator were adequate in representing the field’s behavior.
It can be seen that the simulated curve remains close to the pressure profile observed in the field up to almost 400 bbl of injected fluid volume, with a difference close to 10%. After the 400 bbl volume, there is a slightly larger difference of approximately 40%. Considering the interval before 400 bbl, it can be seen that the PVT and foamed fluid models were adequate to represent the field behavior. After 400 bbl, many uncertainties can be listed regarding the field data, such as the approximate reservoir properties.
Reference
Silva, I. E.; Rylo, E.; Forti, T. L.; Longhin, G. C.; Moreira, R. P.; Piedade, T. S.; Rocha, J. S.; Oliveira, A. G.; Lucchesi, R. D.; Carvalho, C. P.; Cid, K. F.; and F. G. Santos. “Cementing Bullheading Simulator for Well Plugging and Abandonment with Coupled Well-Reservoir Modeling.” Paper presented at the Offshore Technology Conference Brasil, Rio de Janeiro, Brazil, October 2023. doi: https://doi.org/10.4043/32946-MS
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BDC offers an accurate simulation of the cementing and well abandonment process, focusing on operational safety and efficiency.
The coupled well-reservoir simulator enhances predictability and control during cementing operations, ensuring better results.
The use of biphasic fluids, cement paste, and foamed fluid models allows flexible adaptation to different operational scenarios.
The simulator addresses thermodynamic effects, considering heat exchange between well components and the reservoir, increasing simulation accuracy.
The simulator accurately replicated field behaviors, ensuring reliable results and the adequacy of the models used.