A recent study carried out on sane levels of Mbede Field in Nigeria, containing volatile oil and in the presence of primary gas caps, showed quite satisfactory recovery factors. More than 50% of the O.O.I.P has already been recovered from two out of the four hydrocarton bearing levels, while in the remaining two the present recovery factor ranges between 35 and 45%.

These excellent values must be ascribed to the good characteristics of the rock and the oil and to the remarkable "gravity segregation" that is one of the primary drainage mechanisms.

Some forecast cases have been analyzed. They show that the final recovery factor ranges between 52 and 71%. The lowest recovery factors are encountered in the levels where the aquifer is present as a further drainage mechanism.

You can access this article if you purchase or spend a download.