Material Substitution Of Coil Tubes In
CT Drilling Technology For Hard Rocks
Author(s)
R. Roufail & V. Rasouli
Abstract
The fatigue life of coil tubing is known for its low cycle due to multiple bend
events. Since fatigue failure is usually catastrophic, the tube is commonly
withdrawn from service earlier based on its operation life database. The coil tube
in a drilling system needs to be light in weight to facilitate the transportation and
manoeuvring of the equipment. It also needs to last for few hundreds of drill
holes without failure to speed the drilling process and decrease the cost per
drilled hole. The conventional material of the coil tube available in the market is
high strength low alloy steel (HSLAS), which is relatively heavy for frequent
repositioning, and has a low bending fatigue life.
In this study material selection analysis is performed on a variety of candidate
material using performance index method. The performance indices are
evaluated based on the candidate materials’ unit weight, bend-ability, load
carrying capacity, specific stiffness, and fracture toughness and corrosion
resistance. The results suggested composite materials, 56% E-class glass fibre,
73% E-class glass fibre and 63% carbon fibre scored the highest performance
indices that are 62.2, 51.4 and 48.2, respectively. Such materials are suitable
alternatives to the high strength low alloy steel. Candidate material properties are
extracted from literature. A further study is in progress for existing coil tubes,
where their material properties will be investigated for selection purposes.
Keywords: coil tubing, material selection, performance index fatigue, drilling.
Keywords
coil tubing, material selection, performance index fatigue, drilling.
Related Book
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