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Coiled tubing drilling
Coiled Tubing Drilling (CTD) has been used effectively for over 20 years in the oil industry〔()'', Learn About Coiled Tubing Drilling, AnTech, 2014, Retrieved 28 July 2014〕 and the technology has been evolving in order to meet changing industry demands.〔()'', Drilling Market Focus: Coiled Tubing Use Growing Faster than Drilling Industry, The Oil and Gas Journal, 19 Sept 2005, Retrieved 30 July 2014〕 CTD takes the well-established concept of Coiled tubing and combines it with directional drilling using a mud motor to create a system for drilling reservoirs. Bottom hole assemblies (BHAs) are now able to drill directional, S-curve and horizontal wells and can be the key to unlocking reserves in mature oilfields via re-entry drilling. Coiled tubing drilling is known for its speed and ability to drill reservoirs in an underbalanced condition and CTD can reduce drilling times between 30%-60% compared with conventional jointed pipe drilling rigs.〔()'', Niobrara Wells Prove BHA for Coiled Tubing, Drilling Contractor, 15 Mar 2012, Retrieved 30 July 2014〕 Therefore CTD can provide significant economic benefits.〔()'', Introduction to Coiled Tubing: Drilling Applications, ICoTA, Retrieved 29 July 2014〕
==Advantages of Coiled Tubing Drilling==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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