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Limits on the penetration of coiled tubing in horizontal oil wells: effect of the pipe geometry.

McCourt, I; Kubie, Jorge

Authors

I McCourt

Jorge Kubie



Abstract

To carry out remedial work in oil wells through the production tubing string, a method using a continuous length of steel coiled tubing is used. In horizontal wells substantial friction forces are generated which resist the motion of the tubing as it is pushed into the well. As the penetration increases, the friction forces arising from the contact of the tubing with the inner casing wall increase too, and the tubing buckles. The buckling is initially sinusoidal but eventually transforms into helical. At this point the force required to push the tubing rises dramatically, and the maximum penetration is then rapidly reached. Considerable economic benefits could be gained if the limits on the maximum penetration of coiled tubing in horizontal oil wells could be increased. This article discusses ways of increasing the penetration of coiled tubing in horizontal oil wells by managing the geometry of the coiled tubing. It is shown that the best strategy is to keep the external diameter of the coiled tubing constant, and to make up the coiled tubing from several sections, each with uniform, but increased wall thickness. It is shown that with two sections the maximum penetration can be increased by about half, and that with three sections the maximum penetration can be increased by about two-thirds.

Citation

McCourt, I., & Kubie, J. (2005). Limits on the penetration of coiled tubing in horizontal oil wells: effect of the pipe geometry. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 219(11), 1191-1197. https://doi.org/10.1243/095440605X32066

Journal Article Type Article
Publication Date 2005-11
Deposit Date May 28, 2008
Print ISSN 0954-4062
Electronic ISSN 2041-2983
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 219
Issue 11
Pages 1191-1197
DOI https://doi.org/10.1243/095440605X32066
Keywords Oil wells; Horizontal drill hole; Coiled tubing; Increased penetration; Multiple sections;
Public URL http://researchrepository.napier.ac.uk/id/eprint/1872
Publisher URL http://dx.doi.org/10.1243/095440605X32066