Composite marine riser system

A marine riser for use in drilling or production of hydrocarbons from a subsea formation comprising:

• elongated tubular body means constructed of a composite of elongated filaments in a resin matrix to form a load bearing member of said tubular body means;
• buoyancy means disposed around said tubular body means comprising a plurality of annular buoyancy chambers formed by a plurality of axially spaced apart cylindrical ribs disposed around said tubular body means, and a generally cylindrical shell disposed around said ribs and extending generally from one end of said tubular body means to the other, said ribs being in load bearing relationship with said tubular body means, said shell comprising a filament-resin matrix shell body contiguous with said ribs and having a load bearing wall thickness sufficient to provide a predetermined strength to resist collapse from externally applied fluid pressure;
• and
• coupling means at opposite ends of said tubular body means for coupling said riser to a member for transmission of tensile loads through said tubular body means between said ends.

A marine riser for use in drilling or production of hydrocarbons from a subsea formation comprising:

• elongated tubular body means constructed of a composite of elongated filaments in a resin matrix to form a tension load bearing member of said tubular body means, said tubular body means having an elongated bore;
• an elongated thinwalled sleeve disposed in said bore and coextensive with said tubular body means but in nonload bearing relationshp thereto when said tubular body means is in tension, said sleeve being formed of an abrasion resistant material and disposed in protective relationship to said tubular body means from fluids flowing through the interior of said tubular body means;
• seal means cooperating with said sleeve to prevent leakage of fluid between said sleeve and said body means;
• and
• coupling means at opposite ends of said tubular body means for coupling said riser to a member for transmission of tensile loads through said tubular body means between said ends.

A conduit particularly adapted for use in drilling or production of hydrocarbons from an earth formation comprising:

• elongated tubular body means constructed of a composite of elongated filaments in a resin matrix to form a tension load bearing member of said tubular body means, said tubular body means having an elongated bore;
• an elongated thinwalled sleeve disposed in said bore and coextensive with said tubular body means but in nonload bearing relationship thereto when said tubular body means is in tension, said sleeve being formed of an abrasion resistant material and disposed in protective relationship to said tubular body means from fluids flowing through the interior of said tubular body means;
• seal means cooperating with said sleeve to prevent leakage of fluid between said sleeve and said tubular body means;
• and
• coupling means at opposite ends of said tubular body means for coupling said conduit to a member for transmission of tensile loads through said tubular body means between said ends.