This paper presents the architecture and implementation in which two computer codes- TOUGH2 and GeoCrack3D are coupled. A fully coupled thermal-hydrologic-mechanical (THM) analysis of multiphase fluid flow, heat transfer, and deformation in a porous rock can be carried out. The codes are simultaneously executed to run as one module T2STR.

The forward coupling is achieved by using the thermal, hydrostatic and poroelastic effects in the effective stress calculations. The backward coupling is done by including the corrections in porosity, permeability, and capillary pressure as function of mean effective stress. Also, the source term in fluid flow arising due to the volumetric expansion or contraction of porous media is included. A sample problem is solved to demonstrate the capability of the code in correctly predicting the response of a fully coupled system.

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