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Composite spoolable tube
| Details |
Inventors: Quigley, Peter A.; Nolet, Stephen C.; Williams, Jerry G.;
Assignee: Fiberspar Corporation (West Wareham, MA)
Primary Examiner: Brinson; Patrick
Assistant Examiner:
Attorney, Agent or Firm: Foley, Hoag & Eliot, LLP
A spoolable composite tube capable of being spooled onto a reel for storage and for use in oil field applications. The spoolable tube exhibits unique anistropic characteristics that provide improved burst and collapse pressures, increased tensile strength, compression strength, and load carrying capacity, while still remaining sufficiently bendable to be spooled onto a reel in an open bore configuration. The spoolable composite tube can include an inner liner, an interface layer, fiber composite layers, a pressure barrier layer, and an outer protective layer. The fiber composite layers can have a unique triaxial braid structure. |
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DETAILED DESCRIPTION The invention attains the foregoing objects by providing a composite coiled tube that offers the potential to exceed the performance limitations of isotropic metals currently used in forming coiled tubes, thereby increasing the service life of the coiled tube and extending the operational parameters of the coiled tube.
The composite coiled tube of the invention overcomes the disadvantages in present steel coil tubing by providing, among other things, a composite layer that exhibits unique anistropic characteristics capable of providing improved burst and collapse pressures as well as improved tensile strength, compression load strength, and load carrying capability.
The composite coiled tube of the present invention comprises a composite layer having fibers embedded in a matrix and an inner liner formed from polymeric materials or metal.
The fibers in the composite layer are oriented to resist internal and external pressure and provide low bending stiffness.
The composite coiled tube offers the potential to exceed the performance limitations of isotropic metals, thereby increasing the service life of the tube and extending operational parameters.
In addition, the fibers, the matrix, and the liner used in the composite coiled tube can make the tube impervious to corrosion and resistant to chemicals used in treatment of oil and gas wells or in flow lines.
The service life potential of the composite coiled tube constructed in accordance with the invention is substantially longer than that of conventional steel tube when subjected to multiple plastic deformation bending cycles with high internal pressures.
Composite coiled tube also provides the ability to extend the vertical and horizontal reach of existing concentric well services.
In one operation, the composite coiled tube is deployed as a continuous string of small diameter tubing into a well bore to perform a specific well bore procedure.
When the service is completed, the small diameter tubing is retrieved from the well bore and spooled onto a large reel for transport to and from work locations
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Nonmetallic Processes 
