초록 ▼

A composite tubular member having an outer generally cylindrical member containing fibers oriented to resist internal and external pressure and provide low bending stiffness, and two inner areas of axial reinforcement located near the neutral axis of the composite tubular members containing fibers o

A composite tubular member having an outer generally cylindrical member containing fibers oriented to resist internal and external pressure and provide low bending stiffness, and two inner areas of axial reinforcement 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 within the walls of the outer member. These inner areas define a minor moment of inertia of bending extending diametrically through said inner areas and a major moment of inertia of bending generally orthogonal to said minor moment of inertia. Energy conductors integral to the tubular member are arranged in a plane along the minor moment of inertia formed in the tubular member.

대표청구항 ▼

[ We claim:] [1.] A composite coiled tubing for being stored on a spool and which can be spooled and unspooled for use in a wellbore, said composite coiled tubing having a longitudinal axis, comprisinga generally cylindrical tubular liner having a smooth interior bore and high axial stiffness,an out

[ We claim:] [1.] A composite coiled tubing for being stored on a spool and which can be spooled and unspooled for use in a wellbore, said composite coiled tubing having a longitudinal axis, comprisinga generally cylindrical tubular liner having a smooth interior bore and high axial stiffness,an outer composite member which is integrally bonded to said liner, said outer composite member containing fibers cross-plied in concentric layers about said liner and embedded within a plastic binder matrix that permeates the entire outer composite member so that said liner and outer composite member maintain a generally cylindrical shape in use and when spooled on a reel, andaxial stiffness elements arranged in opposite sidewalls of said outer composite member to create a minimum cross-sectional moment of inertia to provide a preferred direction of bending of said coiled tubing thereby imposing minimal bending strain on the axial stiffness elements.