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Steamflood production mechanism in an edge pattern Duri field, Indonesia
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The Duri field, located in Riau Province in Central Sumatra, Indonesia, is currently the site of the largest steamflood project in the world. Roughly half of the field is being flooded in eight project areas. Low oil rate has been encountered in the edge pattern in Duri field. The source of the problem is believed to be the poor steamflood efficiency due to water coning and steam possibly injected into water zone. Evidences for poor steamflood efficiency are a high Steam-oil Ratio and low wellhead temperature. A reservoir simulation study was performed to model the production mechanism in a typical edge pattern of Duri field. A history-match model was developed using a three- dimensional, black-oil, thermal reservoir simulator. A simple pattern-element, layer-cake model was used. Reservoir properties, except permeability and porosity, from the previous model were used and an excellent match of six years of historical performance was obtained by making minor changes in the water relative permeability data. From the result, it can be explained that there are two mechanisms happening to the steam flow in the reservoir. Gravity segregation tends to move steam upward, and least-resistance-flow-path (LRFP) tends to move steam downward due to water cone formed by the producers. LRFP is dominant in the beginning of the steamflood. Water temperature is lower than that of steam, causing even more flow downward to the water zone. Once temperature equilibrium is reached in the OWC, gravity override starts to take over the role. A horizontal well seems to be a good choice to improve the sweep efficiency, because of better contact between wellborn and pay-zone, resulting in lower pressure drawdown for the same production rate. Sensitivity analysis shows the best horizontal section is perpendicular to the reservoir dip. An experimental design using two-level factorial design was performed to find out what variables are influencing the cumulative production, discounted cumulative production and project life for drilling horizontal well in the situation as in Duri field. Correlations to estimate those quantities were developed using linear regression method. It is no surprise that the oil volume and discount factor are the variables that determine those quantities.
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Includes bibliographical references (leaves 53-56).
Issued also on microfiche from Lange Micrographics.
Yuwono, Ipung Punto (1999). Steamflood production mechanism in an edge pattern Duri field, Indonesia. Master's thesis, Texas A&M University. Available electronically from
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