United Kingdom: CT BHA for underbalanced drilling ///

Following several years in design, development and testing in controlled environments, Exeter-based Antech has a new coiled tubing bottomhole assembly, called Colt, which is ready for oil well field trials. Since 2002, a version of the BHA has been used by a Japanese company to drill a series of boreholes to identify potential waste-disposal sites. The tool successfully measured directional and drilling information while drilling. The company delivered the first custom system to Japan in 2002, and a second in 2004. Ongoing support continues with training and updates. The new BHA was introduced, though not commercially, to the petroleum industry in 2001 and is designed for short-radius underbalance CT drilling for gas. The nitrogen foams and light fluids used during gas drilling don’t provide effective damping, so downhole tools are subjected to high levels of vibration and shocks from the drilling process.

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