EVALUATION OF FLUID INJECTION MODELLING APPLICATION USING FINITE ELEMENT HEAT AND MASS TRANSFER CODE (FEHM

• Main Author: Haerusalam, Herdis
• Format: Theses
• Language: Indonesia
• Subjects: Ilmu kebumian
• Online Access: https://digilib.itb.ac.id/gdl/view/32543
• Institution: Institut Teknologi Bandung

Fluids injection into porous and permeable rocks will affect the condition of the surrounding rocks. The injection process will be coupling fluid pressure and stress which causes stress of the rocks around the injection area changed. This change can be simulated using the open source Finite Element Heat and Mass Transfer Code (FEHM) software. In this research, the subsurface model was constructed in 3000m x 3000m x 2000m, consisting of four layers, Zone 1 (0-400m), Zone 2 (400-600m), Zone 3 (600-1300m) and Zone 4 (1300- 2000m). Porosity and permeability parameters are built into two models , Model 1 is made homogeneous for all grids while Model 2 is made inhomogeneous at a certain distance. The distance between grids is arranged uniformly for both models. The point source injection is set at 837 m depth, 1500 meters easting and 1500 meters norting. The material is assumed to be homogeneous, elastic and isotropic. The initial pressure and temperature increase as a function of depth with a pressure gradient of 0.00981 MPa/m and a temperature gradient of 0.025 degrees C/m. The injection process is carried out by injection of 6 kg / sec with simulation time for 10 years. Injection results show that the FEHM software can be used to predict fluid pressure distribution. In the case of Model 1, the fluid pressure distribution is radially distributed in all directions, whereas in the case of Model 2 the fluid distribution will tend to be greater towards greater porosity and permeability values. The injection process also shows the coupling fluid pressure and stress around the injection area.