True Hybrid Operations Combining Coiled-Tubing Drilling and Conventional Rig Workover Techniques and Practices
- Udo Cassee (Nordic-Calista Services) | Danny T. Kara (BP Alaska Exploration Inc.) | Devin P. Rock (Schlumberger) | Sean M. McLaughlin (BP)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2006
- Document Type
- Journal Paper
- 248 - 253
- 2006. Society of Petroleum Engineers
- 4.1.2 Separation and Treating, 6.1.5 Human Resources, Competence and Training, 1.6 Drilling Operations, 1.7.5 Well Control, 3 Production and Well Operations, 1.10 Drilling Equipment, 4.1.5 Processing Equipment, 1.6.10 Running and Setting Casing, 1.7 Pressure Management
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This paper documents the results of a new stage of development in the application of coiled-tubing drilling (CTD). Combining CTD technology with a conventional jointed-pipe workover capability represents the next-step change in providing low-cost reserves access solutions through selection of the most efficient tool for the application.
Drilling sidetracks using coiled tubing is an established practice in Alaska's North Slope oil fields. During these operations, the use of jointed pipe was avoided, except for running liners, with the CTD rig. A conventional workover rig was the preferred approach to prepare the coiled-tubing candidate well when it required a changeout of production tubing or other workover activity.
In 2001, a North Slope operator evaluated the opportunity to utilize one rig to perform both operations. In 2002, a workover rig was modified to fit the need.
Integrating two established technologies presented many challenges. Specialized equipment, multidisciplinary personnel, and control of overall well cost are just a few of the many parts of the operation to be planned. This paper details the results, problems encountered, solutions, and a quantification of the real benefits achieved combining CTD with a jointed pipe workover.
CTD began in the North Slope oil fields during the mid 1990s. More than 400 wells have been sidetracked using this technology during that decade of operation. Drilling equipment selection evolved significantly during this time frame. The first wells were sidetracked with a conventional, arctic-style, coiled-tubing unit (CTU) rigged up over a tree, with external tanks, pits, pumps, and support equipment scattered around location. This was sufficient for proof of concept but extremely difficult in the harsh Arctic environment and posed significant health, safety, and environmental (HSE) exposure. A small workover rig was added to the operation to enclose all the fluids handling equipment and provide a proper Arctic-enclosed rig floor for which to make up drilling assemblies. There still were multiple components, adding to a lengthy rig up in harsh conditions. The makeup of the CTD "rigs?? continued to evolve as through-tubing sidetracks proved to be an economical success.
|File Size||791 KB||Number of Pages||6|
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