Abstract

In the order to justify the horizontal drilling program, it is necessary to employ selective and precise spatial analysis using various reservoir properties. This method comprises three main components, the knowledge, the data and the control (inherent in an inference network). It is, therefore, inevitably subjective and heavily reliant on the expertise of the geologist or reservoir engineer to develop the network and to draw the conclusions.

East Ketaling structure is a mature field with 28 active wells and total net oil production of approximately 190 m3/day (1200 BOPD). Production optimization has been undertaken at East Ketaling structure with three horizontal wells (KTT-35, KTT-36 and KTT-37) within the Air Benakat Formation. This succeeded and increased the total oil production per day by 50 %.

The methodology simply utilizes an approach involving subjective judgment to assign fuzzy membership values over each continuous variable. The mathematical Boolean operators are then used to develop the inference network. This network produces the overlay combination between particular classes, which in turn results in favorable map scaling from highest to lowest priority.

This method will be applied to future horizontal drilling prospects, especially at layer B3a that has a worthwhile potential reserve (±1 MMSTB) with minimum risk, cost and time.