Pseudo-Elastic Response of Gas Bearing Clastic Formations: An Italian Case Study

Christian Coti, Vera Rocca and Quinto Sacchi
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Christian Coti: Stogit Division, Snam S.p.A. (Società per Azioni), 20097 San Donato Milanese, Italy
Vera Rocca: Department of Environment, Land and Infrastructure Engineering, Faculty of Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
Quinto Sacchi: Dream srl (società a responsabilità limitata)—Corso Trento, 5, 10129 Torino, Italy

Energies, 2018, vol. 11, issue 9, 1-12

Abstract: The research presented in this paper focuses on the analysis of land movements induced by underground gas storage operations in a depleted reservoir in Northern Italy with the aim of increasing the understanding of the deformation response of deep formations via a real case study. The a priori knowledge of the pseudo-elastic parameters showed a substantial discrepancy between static values from triaxial lab tests and dynamic values obtained via the interpretation of sonic data at wellbore scale. The discrepancy is not surprising for the formations under investigation: a thousand meters of a silty to shaly sequence intercalated with arenaceous banks above a reservoir formation, which is basically made up of sandstone intercalated with shale intervals and conglomerates. Information collected for over more than ten years of seasonal production/injection cycles (i.e., time and space evolution of the reservoir fluid pressure and of the induced land surface movements) was then combined in a 3D numerical geomechanical model to constrain and update the a priori knowledge on the pseudo elastic model parameters via a back analysis approach. The obtained calibrated model will then be used for reliable prediction of system safety analyses, for example in terms of induced ground movements.

Keywords: pseudo-elastic parameters; 3D numerical geomechanical model; anthropogenic ground surface movements; gas bearing clastic formation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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