Summary
The Champion field is a large oil field offshore Negara Brunei Darussalam.
This paper discusses the (for us) novel application of water injection-induced
multilayer fractured injection into three shallow reservoirs in the Champion
Southeast (CPSE) field. Fractured water injection means that the bottomhole
injection pressure is allowed to exceed the formation’s fracture pressure.
Thereby an unpropped fracture is created, which propagates depending on the
injection water’s leakoff rate into the formation. The project is part of a
larger secondary recovery implementation scheme and future efforts to increase
economic oil production and ultimate recovery in the whole Champion field.
The main boundary condition for the rapid water injection project is the use
of existing infrastructure with the exception of three new water pipelines and
nine new wells. This paper describes the following:
• Reservoir setting and production history.
• Water injection philosophy.
• Design considerations for fractured water injection including:
o Pressure requirement to design for fractured water injection.
o Simulation of fracture growth and containment and resulting
conclusions.
• Design considerations for the multilayer fractured water injector wells
including:
o Selected drilling aspects (well trajectory, drill-in fluid, formation
evaluation, casing scheme).
o Completion design considerations (cleanout, perforating, sand control,
selectivity, “smartness”, other).
o Material selection.
One of the main conclusions is that fracture growth and containment is not a
major issue in soft, high-permeable formations. The main challenge is in
drilling the—in some cases—demanding well trajectories and running the “smart”
completions in these wells with small tolerances.
Introduction
The Champion Southeast (CPSE) field is part of the larger Champion field,
which is the largest known offshore oil accumulation in Negara Brunei
Darussalam, a small, oil-rich state on the north coast of the island of Borneo
(Fig. 1). The CPSE field is located in 10 to 45 m water depth at a distance of
approximately 40 km north of Bandar Seri Begawan, the capital of Negara Brunei
Darussalam.
This paper focuses on the rapid implementation of a pressure maintenance
scheme using multilayer fractured water injection and related design and
completion considerations for the water-injection wells to arrest the
faster-than-anticipated pressure depletion in these shallow reservoirs.
© 2007. Society of Petroleum Engineers
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History
- Original manuscript received:
13 June 2006
- Meeting paper published:
11 September 2006
- Revised manuscript received:
30 May 2007
- Manuscript approved:
17 August 2007
- Version of record:
20 December 2007
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