AnTech Ltd. has unveiled the COLT, a bottomhole assembly (BHA) designed to eliminate some of the problems associated with coiled tubing drilling (CTD) applications, particularly in depleted reservoirs and gas formations where downhole tools can be subjected to high vibrations and shocks. According to a company spokesperson, using COLT, it is now possible to carry out short radius underbalanced CTD for gas because the new design reduces risk of formation damage.

Other features, according to the company, include:

• Robust design withstands rigorous shock and vibrations while operating downhole. The physical layout of the tool is designed to resist damage in harsh environments, it is fitted with durable metal-to-metal seals, and it has a specially designed smooth flowpath making the tool less affected by fluid-induced wear and vibrations. The tool is also being subjected to rigorous and intensive vibration testing.

• Compact size makes it less expensive to operate, transport and rig up and down. With just one connection to the coil and one connection to the drilling motor, rig-up time at the wellhead is reduced to minutes.

• Responsive system is easy to steer because of the new electrically powered orienting tool, Pointing Orienter, which lets the operator change the direction of the tool very quickly.

• Sensors and telemetry provide the operator with real-time information, such as downhole conditions, tool position, and geological formation, on which to make decisions. Sensors include a pressure compensated weight-on-bit sensor, pressure sensors, and steering and gamma ray sensors.

• Precise control resulting from the bend on the tool, which is continuously adjustable from 0 to 3 degrees while drilling, which lets the operator drill with greater precision with the possibility of drilling the build section and the later section in one trip.

For more information, visit www.antech.co.uk.

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