Summary
The Duri field in Sumatra, Indonesia, shown in Fig. 1 and operated by
Chevron Pacific Indonesia (CPI), is one of the largest onshore steamflood
operations in the world. Producing heavy oil (approximately 25°API) from an
essentially unconsolidated reservoir with a depth that ranges from 300 to 700
ft using steam injection at 300 to 400°F poses a unique challenge in designing
an effective, yet economic, completion. One of the biggest problems associated
with the production of the crude oil in this environment is the production of
massive amounts of solids. In addition to the cost of the recompletions,
problems associated with disposing of this amount of sand--and the effect the
produced solids have on the facilities, such as stabilization of emulsions--are
a large cost to operations.
A program was initiated in 2002 to evaluate the effectiveness of the
completions in the Duri field. This effort involved evaluated field data, such
as the frequency and type of workovers, the amount and size of produced solids,
the nature and number of failed liners, and the frequency of stuck sucker-rod
pumps, to understand the efficiency of the sand-control completions better.
Local sand-control gravel used in the completions was evaluated for steam
dissolution and adherence to American Petroleum Institute (API)
gravel-pack-sand standards. An audit of the primary sand-control-screen
manufacturer was also conducted to evaluate the quality of the sand-control
screens used in the completions. In addition, on site inspections of the
operational aspects of the completions were completed. The results of the
program showed that the completion designs and sand-control screens were up to
industry standards. However, several operational aspects were identified as
opportunities for improvement. The results of the program are presented, and
items for improvement of the completion for thermal wells in the Duri field are
discussed in this paper.
© 2009. Society of Petroleum Engineers
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History
- Original manuscript received:
26 October 2006
- Meeting paper published:
5 December 2006
- Revised manuscript received:
29 September 2008
- Manuscript approved:
7 October 2008
- Published online:
16 March 2009
- Version of record:
1 March 2009
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