Method of creating a wellbore in an underground formation

Details Method of creating a wellbore in an underground formation Method of creating a wellbore in an underground formation

2001-01-26

2002-04-16

Neuder, William (Department: 3672)

Wells

Expansible anchor or casing

Expansible casing

C175S023000

Reexamination Certificate

active

06371203

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a method of creating a wellbore in an underground formation comprising drilling a borehole in the underground formation using a drilling tubular, capable of being expanded, to which a downhole motor driving a drill bit has been connected, and, after drilling to the desired casing setting depth, expanding the drilling tubular into place to line the borehole by applying a radial load to the drilling tubular and removing said load from the tubular after the expansion.
BACKGROUND OF THE INVENTION
Expansion methods and devices are disclosed in German patent specification No. 1583992 and in U.S. Pat. Nos. 3,162,245 to Howard et al; 3,167,122 to Lang; 3,203,483 to Vincent; 3,326,293 to Skipper; 3,489,220 to Kinley; 3,785,193 to Kinley et al; 5,014,779 Meling et al; 5,031,699 to Artynov et al; 5,083,608 to Abdrakhmanov et al; and 5,366,012 to Lohbeck.
Many of the known expansion methods employ an initially corrugated tube and the latter prior art reference employs a slotted tube which is expanded downhole by an expansion mandrel.
The use of corrugated or slotted pipes in the known methods serves to reduce the expansion forces that need to be exerted to the tube to create the desired expansion.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method for expanding a solid, i.e. unslotted, tubing which requires exertion of a force to expand the tubing and which provides a tubing having a larger diameter and higher strength than the unexpanded tubing and which can be carried out with a tubing which already may have a tubular shape before expansion.
There is provided a method of creating a wellbore in an underground formation comprising drilling a borehole in the underground formation using a drilling tubular, capable of being expanded, to which a downhole motor driving a drill bit has been connected, and, after drilling to the desired casing setting depth, expanding the drilling tubular into place to line the borehole by applying a radial load to the drilling tubular and removing the load from the drilling tubular.


REFERENCES:
patent: 3162245 (1964-12-01), Howard et al.
patent: 3167122 (1965-01-01), Lang
patent: 3203483 (1965-08-01), Vincent
patent: 3326293 (1967-06-01), Skipper
patent: 3489220 (1970-01-01), Kinley
patent: 3785193 (1974-01-01), Kinley et al.
patent: 4483399 (1984-11-01), Colgate
patent: 5014779 (1991-05-01), Meling et al.
patent: 5031699 (1991-07-01), Artynov et al.
patent: 5083608 (1992-01-01), Abdrakhmanov et al.
patent: 5366012 (1994-11-01), Lohbeck
patent: 5535824 (1996-07-01), Hudson
patent: 6021850 (2000-02-01), Wood et al.
patent: 1583992 (1971-06-01), None
patent: 0911483 (1999-04-01), None
patent: 2326896 (1999-01-01), None
patent: 93/25799 (1993-12-01), None
patent: 97/17524 (1997-05-01), None
patent: 97/20130 (1997-06-01), None
patent: 99/35368 (1999-07-01), None
Metal Forming-Mechanics and Metallurgy, Chapter 3, 2ndEd.. Prentice Hall. New Jersey, 1993.
International Search Report dated Jul. 14, 2000.
Metal Forming-Mechanics and Metallurgy, Chapters 3 and 17, 2ndEd., Prentice Hall, New Jersey, 1993.
Metals Handbook, Forming and Forging, pp. 7, 373-387, and 874-899, 9thEd., vol. 14, ASM International, Metals Park, OH (USA) 1993.
Failure of Materials in Mechanical Design, J.A. Collins, Chapter 3.5, pp. 34-37, 2ndEd., John Wiley & Sons, New York (USA) 1993.

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