ABSTRACT:

To obtain a good evaluation of oil sand reservoir deformation during thermal stimulation and its induced ground subsidence, elastic property changes with reservoir temperature are desired. In this contribution, the Karamay oil sand is viewed as a composite geomaterial consisting of bitumen (matrix) and grains (inclusions). Firstly, the elastic properties of bitumen are expressed as functions of both temperature and time. Similarly, the Eshelby's, Mori-Tanaka's and differential methods are used to write the elastic properties of oil sand (composite material) as functions of both temperature and time, too. An equivalent static time is proposed to eliminate the effect of time. A temperature transform is established according to experimental data for applying the theoretical models to practices. In this regard, if knowing the individual elastic properties of the bitumen/solid grains as well as reservoir porosity, the oil sand's effective elastic properties can be evaluated theoretically. The laboratory experimental data is used to verify the predicted method proposed, and it shows a good agreement. The effects of reservoir porosity, temperature and time on the effective elastic properties of oil sand are discussed. The method proposed can provide a guidance for the engineers in charge of field operations or numerical simulations to evaluate the elastic properties of oil sand reservoirs during thermal stimulations.

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