| Recoverable oil reserves remain trapped in fractured reservoirs of dual porosity with very low permeability rock matrix blocks, 0.10 md or less, and a fracture system. Conventional secondary methods cannot be applied to this type of reservoirs because injected fluids channel though the fractures bypassing oil trapped in the matrix blocks. Spontaneous water imbibition is an spontaneous mechanism that could be applied. The process exchanges oil inside the rock matrix for surrounding water filling the fractures. However, the process is very time dependent.;Oil distribution inside carbonated rock samples, and the effects of introducing CO;A high pressure core holder suitable for MRI and CT applications was developed using commercial fiber glass tubing. Development of the new tool permitted imbibition of unadulterated and carbonated water to be studied at a reservoir pressure of 2000 psi.;Different cases were studies: (1) Imbibition of unadulterated water; (2) Imbibition of CO;Introduction of CO;Oil recovery by CO... |
