 Spoolable composite tubular member with energy conductors |
| OF THE INVENTION Composite fibers (graphite, Kevlar, fiberglass, boron, etc.) have numerous assets ... |
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| Composite spoolable tube |
| The invention attains the foregoing objects by providing a composite coiled tube that offers the ... |
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| Joining member and method of joining two conductive pieces of fiberglass reinforced plastic pipe |
| This invention provides a method of joining two pieces of fiberglass reinforced pipe, the pipe ... |
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| Composite spoolable tube |
| OF ILLUSTRATED EMBODIMENTS Composite fibers (graphite, Kevlar, fiberglass, boron, etc.) have ... |
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| Composite spoolable tube |
| The invention attains the foregoing objects by providing a composite coiled tube that offers the ... |
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| Composite spoolable tube |
| The invention attains the foregoing objects by providing a composite coiled tube that offers the ... |
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| System for controlled lowering of a tube or cable |
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| Systems and methods for pipeline rehabilitation |
| OF EXEMPLARY EMBODIMENTS FIG. 1 illustrates an exemplary embodiment of a system 10 for ... |
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| Heat shield |
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| Method for making tool with dual-material handle |
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Composite tubular member with axial fibers adjacent the side walls
| Details |
Inventors: Williams, Jerry G.; Hopkins, Mark W.;
Assignee: Conoco Inc. (Ponca City, OK)
Primary Examiner: Sewell; Paul T.
Assistant Examiner: Cicconi; Bethanne C.
Attorney, Agent or Firm:
A composite tubular member having an outer cylindrical member containing fibers oriented to resist internal pressure and provide low bending stiffness, and two inner smaller core members located near the neutral axis of the composite tubular members containing fibers oriented to provide high axial stiffness, high tensile strength and low bending stiffness and fibers oriented to resist shear stress, positioned opposite each other and adjacent to the inner walls of the outer cylindrical member. |
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DETAILED DESCRIPTION OF THE INVENTION Composite fibers (graphite, Kevlar.
RTM.
, fiberglass, boron, etc.
) have numerous assets including high strength, high stiffness, light-weight, etc.
, however, the stress strain response of composite fibers is linear to failure and therefore non ductile.
Composite coil tubing must therefore address the strain limitations in another manner, i.
e.
, by providing a design to meet the requirements with a near elastic response.
Such a composite design must have high resistance to bending stresses and internal pressure.
It must also have high axial stiffness, high tensile strength and be resistant to shear stress.
All of these properties are combined in the composite tubular member of the invention to provide a coiled tubing which can be bent to a radius compatible with a reasonable size spool.
The invention is best described by reference to the drawings.
FIG.
1 shows a cross-sectional view of a composite tubular member which is made up of a composite cylindrical member 2 and two composite inner members 4.
Composite cylindrical member 2 contains fibers which are cross-plied and oriented at .
+-.
55.
degree.
to the axis of the tubular member.
The (.
+-.
) signifies opposite orientation of the fibers at the degrees indicated.
This orientation of the fibers is the optimum to achieve high structurally efficiency for outer cylindrical member 2 when such member is subjected to bending and is under internal pressure loading.
Outer cylindrical member 2 will usually contain from about 5 to about 10 percent fibers which are oriented at approximately 90.
degree.
, that is, approximately perpendicular to the axis of the composite tubular member.
The inclusion of the 90.
degree.
fibers lowers the Poisson ratio of the composite tubular member toward 0.
5 and increases the ability to carry shear stress in such member.
The opposing inner composite members 4 contain fibers which are oriented at 0.
degree.
to the axis of the tubular member to meet the requirement for high axial stiffness, high tensile strength and low bending stiffness
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Nonmetallic Processes 
