VISCOUS DISPLACEMENT IN FRACTURED POROUS-MEDIA

In some fractured reservoirs, a gas pressure gradient of the order of 3 - 5 kPa/m may be established in the fractures due to flow. Such a pr essure gradient could result in recovery enhancement of the matrix oil . Several tests are conducted to study viscous displacement in fractur ed porous media with artificial fractures. These tests are analysed by using a fully-implicit finite difference simulator with appropriate f racture capillary pressure. The results show that there is considerabl e recovery improvement due to viscous displacement. For a gas pressure gradient of 3 kPa/m, the matrix oil recovery increases by 10% of PV i n one of the tests.