Pipes and tubular conduits – Repairing – Patches
Reexamination Certificate
2001-03-19
2003-02-25
Hook, James (Department: 3752)
Pipes and tubular conduits
Repairing
Patches
C138S097000
Reexamination Certificate
active
06523574
ABSTRACT:
BACKGROUND OF THE INVENTION
Pipe and other tubulars have been lined with tubular polymeric liners, e.g., polyethylene, nylon
11
, etc., for many years. These systems have been used principally in offshore and onshore pipelines, and in downhole production tubulars. Generally, the liner resides in close-tolerance with the host pipe along its length, forming a stable composite system. See
FIG. 1
, which is a cutaway end view of a lined tubular.
Several installation techniques are known to the art. However, they have all retied upon one of two methods to insert the liner into the host tubular; either pulling or pushing from one end or the other. Typically, to pull liners in, a cable is used, or if in the vertical direction, weights in conjunction with gravity have been employed to the same effect. In pushing methods, usually a four-step cycle is used upon the liner, consisting of the steps of clamp-push-release-reposition.
Under the current art, the maximum length of an individual installation segment has been limited by the mechanical properties of the liner in concert with the friction drag accumulated during the insertion process.
For example, for polyethylene liners installed in diameter-reduced fashion, e.g., the known Titeliner™ and Swageliner™ systems and the like, installation lengths tend to average 2500 feet, and the maximum permissible length is approximately 5000 feet. Tensile loads, borne totally by the liner, continually climb throughout the insertion process, in proportion to distance pulled, with all the force being directed through the leading end of the liner. As a result, when longer lengths are attempted, the liner simply pulls apart.
In pushing methods, the practical lengths tend to be even shorter. The relatively flexible liners quickly assume an ‘S-curve’ within the host due to the pushing. The resultant friction against the host wall is thus amplified, and the process simply stalls.
Generally, in either case, bends in the host pipe substantially diminish achievable insertion length. Drag between the liner and the host pipe increases dramatically due to bends that the liner passes. The increase in lateral pressure due to a bend increases the total friction between the two elements. Lining of reeled pipe is virtually impossible, since all segments that are to be lined must be relatively straight for best effect.
SUMMARY OF THE INVENTION
The invention relates to a method of injecting liners into host tubulars. Fluid is pumped into the host pipe concurrent with introduction of the liner. The momentum and drag imparted by the fluid to the liner induces axial motion of the liner for insertion into the tubular. Also, the pressure of the fluid in the host maintains the liner in a reduced cross-section throughout the insertion process, minimizing drag.
The invention extends the maximum installation length. It facilitates the ability to insert a liner over long distances, into those lines where sectioning into short distances is impractical, or impossible; e.g., water crossings and restricted rights-of-way. It can also be used to install liner into reeled pipe as well as straight pipe. These benefits translate directly to lower project costs. Fewer insertion operations are necessary for any in-situ rehabilitation project where the line is multiply sectioned, resulting in reduced time, hardware and overall cost. The invention also permits lining of new host tubulars at a plant-site for improved logistics and quality control. A final benefit of the method is that less longitudinal stress is imparted on the liner, minimizing failure potential and thus enabling longer service life.
The method is equally suitable to both pipeline, i.e., essentially horizontal, and downhole, i.e., essentially vertical, applications.
Other features and advantages of the invention will become apparent from the following detailed description, in conjunction with the drawings.
REFERENCES:
patent: 1304036 (1919-05-01), Eshelby
patent: 1930285 (1933-10-01), Robinson
patent: 2440245 (1948-04-01), Chevigny
patent: 2794758 (1957-06-01), Harper et al.
patent: 3184958 (1965-05-01), Eaton
patent: 3299417 (1967-01-01), Sibthorpe
patent: 3339415 (1967-09-01), Wild
patent: 3554493 (1971-01-01), Bowden et al.
patent: 3581776 (1971-06-01), Sheahan
patent: 3626987 (1971-12-01), Bittner
patent: 3907336 (1975-09-01), Siegmund
patent: 3933182 (1976-01-01), Costes
patent: 4185809 (1980-01-01), Jonnes
patent: 4220179 (1980-09-01), Scheffler et al.
patent: 4274549 (1981-06-01), Germain
patent: 4321110 (1982-03-01), Nickel et al.
patent: 4332170 (1982-06-01), Belval et al.
patent: 4386269 (1983-05-01), Murphy
patent: 4446891 (1984-05-01), Gebelius
patent: 4450711 (1984-05-01), Claude
patent: 4529009 (1985-07-01), Horner et al.
patent: 4554650 (1985-11-01), Brown et al.
patent: 4644780 (1987-02-01), Jeter
patent: 4651893 (1987-03-01), Mooney
patent: 4667505 (1987-05-01), Sharp
patent: 4676563 (1987-06-01), Curlett et al.
patent: 4683944 (1987-08-01), Curlett
patent: 4693279 (1987-09-01), Aubert
patent: 4700751 (1987-10-01), Fedrick
patent: 4756339 (1988-07-01), Buluschek
patent: 4804020 (1989-02-01), Bartholomew
patent: 4805444 (1989-02-01), Webb
patent: 4836305 (1989-06-01), Curlett
patent: 4867921 (1989-09-01), Steketee, Jr.
patent: 4920786 (1990-05-01), Danielson
patent: 4924949 (1990-05-01), Curlett
patent: 4932257 (1990-06-01), Webb
patent: 4965036 (1990-10-01), Miyazaki et al.
patent: 4985196 (1991-01-01), LeDoux et al.
patent: 4986951 (1991-01-01), Ledoux et al.
patent: 5034180 (1991-07-01), Steketee, Jr.
patent: 5040408 (1991-08-01), Webb
patent: 5060509 (1991-10-01), Webb
patent: 5091137 (1992-02-01), Ledoux
patent: 5172730 (1992-12-01), Driver
patent: 5222769 (1993-06-01), Kaempen
patent: 5305798 (1994-04-01), Driver
patent: 5308041 (1994-05-01), Griffioen et al.
patent: 5327945 (1994-07-01), Simpson et al.
patent: 5327949 (1994-07-01), Dotson et al.
patent: 5333490 (1994-08-01), Webb
patent: 5335872 (1994-08-01), Clubbs
patent: 5342570 (1994-08-01), LeDoux et al.
patent: 5343738 (1994-09-01), Skaggs
patent: 5395472 (1995-03-01), Mandich
patent: 5409561 (1995-04-01), Wood
patent: 5447665 (1995-09-01), Steketee, Jr.
patent: 5454419 (1995-10-01), Vloedman
patent: 5469891 (1995-11-01), Lund et al.
patent: 5490419 (1996-02-01), Webb
patent: 5497809 (1996-03-01), Wolf
patent: 5546992 (1996-08-01), Chick et al.
patent: 5551484 (1996-09-01), Charboneau
patent: 5611373 (1997-03-01), Ashcraft
patent: 5743299 (1998-04-01), Chick et al.
patent: 5778938 (1998-07-01), Chick et al.
patent: 5794663 (1998-08-01), Kiest, Jr. et al.
patent: 5810053 (1998-09-01), Mandich
patent: 5831149 (1998-11-01), Webb
patent: 5861116 (1999-01-01), Mandich
patent: 5884384 (1999-03-01), Griffioen
patent: 5934332 (1999-08-01), Rodriguez et al.
patent: 6021815 (2000-02-01), Kiest, Jr. et al.
patent: 6024910 (2000-02-01), Kamiyama et al.
patent: 2706069 (1978-08-01), None
patent: 0337674 (1989-10-01), None
patent: 2262321 (1993-06-01), None
patent: 9012241 (1990-10-01), None
Newman, et al., “Development of a Coiled Tubing Cable Installation System,” Society of Petroleum Engineers. Inc. (1995).
U.S. patent application Ser. No. 09/077,236 filed May 26, 1998, allowed.
Hook James
Ostrolenk Faber Gerb & Soffen, LLP
SafetyLiner Systems, LLC
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