Geologic Input to Work Processes at Duri Field, Indonesia

H. Primadi, W. D. Jackson, G. J. McNaboe, L. Bamahry, H. Semimbar, A. Desman, B. Setiyadi, H. Dedi, M. Djamaludin, and I. Z. Batubara

Duri Field, central Sumatra, Indonesia, at 300,000 bbls per day from over 3000 wells is considered the world's largest steamflood. A project of this magnitude presents significant challenges during the planning, implementation, and operational phases. One of the biggest challenges was to increase the amount of geological data being used in decisions made on a daily basis in operations. This paper will focus on the contributions made by geologists to pattern analysis, a key process within the new, cross-functional, Asset Management Teams.

The geological contribution to pattern analysis is zone correlation, geostatistical modeling, and establishment of flow units on a pattern basis. The tools necessary for the effort include statistics, formation evaluation, post steam resistivity logs, computer mapping (reserves, kh, Phi-H-So, transmissivity, 4D seismic). All applied on a pattern area to layers (15 acre patterns, 5-8 layers per pattern). The geology products are now integrated with other information, (temperature surveys, krypton surveys, PNC logs, well head temperatures, liner damage image), all previously used with little geology input.

Each AMT is responsible for approximately 150-200 patterns and each pattern must be reviewed twice a year. Each work day of the year, up to 24 wells and all new data are reviewed. The pace of work requires dependable, easily communicated analyses. Estimates that this layer management of the steamflood increases the recovery efficiency by 5% at a minimum, a potential increase in reserves of 500 million barrels.

AAPG Search and Discover Article #91019©1996 AAPG Convention and Exhibition 19-22 May 1996, San Diego, California