The Baturaja (BRF) Clastic Formation in the Ramba Field of South Sumatra, Indonesia must be hydraulically fracture-stimulated to produce the reservoir at an acceptable economic level. Early efforts at producing from this formation were disappointing. A combination of a detailed reservoir engineering study and developments in fracture stimulation technology has made this zone an economic success.

The detailed engineering study allowed for a better understanding of the permeability variations within the formation across the field which in turn helped in the selection of optimum placement of the wells and individually tailoring the fracture stimulation treatment designs to suit particular well and reservoir conditions.

Early fracture-stimulation treatment designs used oil-based and water-based titanate/zirconate-crosslinked fracture fluids systems with mixed results. The most recent fracture stimulation treatments have employed a combination of a low polymer loading water-based borate-crosslinked fluid, and a Surface Modification Agent (SMA) to the proppant. The SMA increases the fracture conductivity, creates a flexible, stable proppant pack, reduces fines migration and fines invasion of fracture pack, assists in proppant flow back control; and reduces fracture cleanup time.

Sixteen wells were completed in the Clastic formation in late 1999 and early 2000. This paper discuss the design details and explains the changes made to the hydraulic fracture stimulation treatments to make this formation an economic success.

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