RapidSeal Junction, Indonesia
CNOOC drilled and completed the first TAML Level 6 multilateral well in Indonesia and the world’s first Level 6 intelligent completion. The objective was to increase recoverable reserves and reduce well-construction costs. A RapidSeal junction was installed to complete the NE Intan A-24 well in the Java Sea.

This well in 23 m [75 ft] of water required less time to drill—just 25 days—and cost about $1 million less than the AC-06 well, a Level 3 multilateral completion in East Rama field drilled to about the same depth with similar lateral lengths.

After the 9 5/8-in. RapidSeal junction was oriented, expanded and cemented in place at 2770 ft [844 m] MD, both lateral branches were drilled with synthetic oil-base mud.
 
The first lateral extended 1655 ft [504 m] MD and was drilled with a 61⁄8-in. bit. The second lateral extending 2335 ft [712 m] MD was drilled with a 6-in. by 7-in. bicentered bit using a PowerPak positive displacement motor that had a 1.83° bent housing.

CNOOC completed the first lateral with 31⁄2-in. premium sand-control screens. The second lateral utilized 41⁄2-in. premium sand-control screens. Each branch included an external casing packer (ECP) for zonal isolation. Advanced completion equipment with downhole hydraulic valves and sensors to measure pressure, temperature and flow rate for each well branch was installed above the junction to control production.

A Schlumberger electrical submersible pump with a downhole MultiSensor well monitoring unit for submersible pump completions and a variable-speed drive at the surface lifted hydrocarbons to the surface through 41⁄2-in. tubing. Multiphase flowmeters and a surface control and data acquisition (SCADA) system on surface monitored pump parameters and well performance, transmiting real-time data to CNOOC via the Web.