关键词: 无水采油期, 地层压力测量, 油气动用程度, 油层采出程度, 油层剩余油饱和度, 压力系数

Abstract:

Properties of formation fluid and formation pressure can be evaluated by Wireline Formation Multi-Tester (FMT) data including formation pressure and formation fluid data. Consequently, FMT data plays an important role at the stage of oil-field exploration. However, FMT can have more important applications at the stage of entire oil-field development. One of these is to estimate the remaining oil saturation during the water-free oil production period. Various methods have been introduced to determine the remaining oil saturation in the water-free period. Based on the Darcy Law, we introduced a concept of the reservoir producing degree and recovery degree, and put forward a new approach that applied reservoir pressure data acquired by FMT to estimate the remaining oil saturation. During the water-free 〖JP+1〗producing period, the oil reservoir resistivity is almost the same as the original reservoir resistivity, and the difference in remaining oil saturations calculated by the two resistivities mentioned above is also very small. In this case, a wrong conclusion of the low producing degree may readily be deduced. Therefore, FMT data should be used to estimate the remaining oil saturation, which can avoid wrong interpretations. As to a producing well in the development period, resistivity logging data and FMT data should be integrated to calculate the remaining oil saturation, and they can complement mutually in application.

Key words: water-free oil production period, formation pressure measurement, oil-gas producing degree, reservoir recovery degree, remaining oil saturation, pressure coefficient