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Modeling poroelastic effect on borehole stability for under-balanced and over-balanced drilling conditions
Since rock formations are always saturated by fluids, the coupled poroelastic models were developed to conduct wellbore stability analysis. The analysis based on this theory allows us to consider phenomena such as well communication with rock formation, change of pore pressure profile, pore pressure dissipation, etc. This article presents the analytical solution of one coupled poroelastic model and then departs to consider two common drilling scenarios, which are under-balanced drilling (UBD) and over-balanced drilling (OBD). Obtained results show that the phenomena of time-dependent delayed failure and failure initiation taking place not only at the wellbore wall but also inside the formation can be predicted by virtue of the coupled model. Moreover, these two phenomena are different for the two drilling scenarios mentioned above. Regarding the (UBD), the borehole stability status will get enhanced with time due to the poroelastic effect in the formation. On the contrary, the borehole stability status will get worse, and time-delayed failure may happen for the OBD.
Modeling poroelastic effect on borehole stability for under-balanced and over-balanced drilling conditions
Since rock formations are always saturated by fluids, the coupled poroelastic models were developed to conduct wellbore stability analysis. The analysis based on this theory allows us to consider phenomena such as well communication with rock formation, change of pore pressure profile, pore pressure dissipation, etc. This article presents the analytical solution of one coupled poroelastic model and then departs to consider two common drilling scenarios, which are under-balanced drilling (UBD) and over-balanced drilling (OBD). Obtained results show that the phenomena of time-dependent delayed failure and failure initiation taking place not only at the wellbore wall but also inside the formation can be predicted by virtue of the coupled model. Moreover, these two phenomena are different for the two drilling scenarios mentioned above. Regarding the (UBD), the borehole stability status will get enhanced with time due to the poroelastic effect in the formation. On the contrary, the borehole stability status will get worse, and time-delayed failure may happen for the OBD.
Modeling poroelastic effect on borehole stability for under-balanced and over-balanced drilling conditions
Qi, Zili (Autor:in) / Nawrocki, Pawel A. (Autor:in) / Wang, Dong (Autor:in)
Geosystem Engineering ; 16 ; 54-61
01.03.2013
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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