Coiled Tubing was introduced to the Karachaganak Field in 1997 as part of a package of technical enhancements designed to improve field productivity. Initially planned only for acid stimulation work during the summer, the service has been extended into an all year round support to the Workover, Stimulation and Well Service programs. Examples of the type of operations performed are described. These include tubing cutting, cleaning and acid washing as required to remove tailpipes during workovers. Fishing to clean up old wells prior to the workover. Inflatable packer isolations for acid stimulation and wellhead repairs.

Introducing a new service, such as coiled tubing, to any location, presents an interesting challenge. Developing and applying the techniques within the service, particularly on an established, corrosive, gas/condensate production field with old, high rate, well stock, located in a remote area with extreme weather conditions, challenges the technical application of Engineers, operators and support services.

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