Composite coiled tubing apparatus and methods

A composite coiled tubing comprising:

• a cylindrical surface layer;
• a cylindrical composite fiber layer, wherein the composite fiber layer is concentrically inside of the surface layer, the composite fiber layer formed by weaving composite fibers in a predetermined pattern whereby the fibers are oriented in angular relationship to the longitudinal direction of the coiled tubing such as to provide appropriate strength and buckling characteristics to the coiled tubing;
• said coiled tubing having a section modulus and section properties which vary along the length of the coiled tubing so that predetermined characteristics of said coiled tubing including stiffness or strength thereof may be selectively varied,
• a cylindrical liner layer concentrically inside the composite fiber layer;
• further wherein conductive fibers are provided within the composite coiled tubing extending continuously along said coiled tubing, the fibers being adapted to transmit signals representing data along said coiled tubing.

A composite coiled tubing of a hollow cylindrical cross section, comprising:

• an inner cylindrical liner layer;
• an outer cylindrical composite fiber layer in concentric relation to said inner liner layer to form with said inner liner layer a circumferential wall defining said hollow cylindrical cross section of said coiled tubing, the composite fiber layer formed in part by woven fibers in a predetermined pattern whereby the woven fibers are oriented in relationship to the longitudinal direction of the coiled tubing such as to provide appropriate strength and buckling characteristics to the coiled tubing;
• conductive metal wire in said circumferential wall extending continuously without interruption for a predetermined continuous length of said coiled tubing for conducting signals along said coiled tubing;
• said coiled tubing having a predetermined section modules and section properties which vary along the length of the coiled tubing so that predetermined characteristics of said coiled tubing including stiffness or strength thereof may be selectively varied;
• and
• a microprocessor positioned in said circumferential wall and in communication with said metal wires for receiving and transmitting data.

A composite coiled tubing of a hollow cylindrical cross section, comprising:

• an outer cylindrical liner layer;
• a cylindrical composite fiber layer, wherein the composite fiber layer is concentrically inside of the surface layer to form with said outer layer a circumferential wall about the hollow coiled tubing, the composite fiber layer formed in part by weaving composite fibers in a predetermined pattern, the woven fibers oriented in relationship to the longitudinal direction of the coiled tubing and the angles formed by said woven fibers as compared to the longitudinal direction of the coiled tubing varying along the length of the coiled tubing for varying correspondingly the strength and bending modulus of the coiled tubing;
• conductive fibers in said wall of said hollow composite coiled tubing extending continuously without interruption for a predetermined continuous length of said coiled tubing for conducting signals along the continuous length of said coiled tubing;
• said coiled tubing having a predetermined section modules and section properties which may vary along the length of the coiled tubing so that predetermined characteristics of said coiled tubing including stiffness or strength thereof may be selectively controlled;
• said composite coiled tubing having to a reel end proximate a reel for the composite coiled tubing and a distal end attached to a tool for insertion within a wellbore;
• and a disconnect for the composite coiled tubing at a predetermined position along the length of said coiled tubing and a plurality of fibers of varying strength and orientation mixed into a fiber blend wherein a load at which the composite disconnect fails correspond to the failure characteristics of the fiber blend.