Proceedings of the 1999 SPE Technical Symposium Paper 60766-MS, 1999

EXPANDABLE WELLBORE TUBULARS

R.B. Stewart1, F. Marketz1, W.C.M. Lohbeck1, F.D. Fischer2, W. Daves2, F.G. Rammerstorfer3, H.J. Böhm3

1SIEP, Rijswijk, The Netherlands
2Institute of Mechanics, University of Mining and Metallurgy,
Leoben, Austria
3Institute of Lightweight Structures and Aerospace Engineering,
TU Wien, Vienna, Austria


Abstract - The development of expandable tubular technologies was initiated by the business need to reduce drilling costs, to increase production of tubing constrained wells and to enable operators to access reservoirs that could otherwise not be reached economically without using expandable wellbore tubulars.

Expanded casing applications concentrate on reducing the telescopic profile of well designs. Casings and liners can be expanded against the previous casing/liner in such a way that each time they are set, the well diameter is just reduced by two tubular wall thicknesses. Furthermore, expandable wellbore tubulars also give life to existing wellbores through capabilities for selective water shut-off, damaged casing and tubing repair or for increasing burst and collapse ratings by cladding the inside of casing and tubing.

Yard tests have shown that it is possible to expand tubulars by up to 40 pct in diameter at a rate of up to 100 [ft/min] by means of propelling ceramic headed or hardened steel mandrels. The critical success factors for unconstrained expansion and cladding of wellbore tubulars and their implications for downhole applications will be addressed.

The development of commercial products for use in the oil-field requires the complementary capabilities of both service and operating company personnel. A novel type of technology commercialization concept has been established to provide the technology to the Industry through two fifty-fifty joint venture companies between an operator and major service companies.


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