High strength connection for sleeve and mandrel and related methods
AssigneeCCDI Composites, Inc.
InventorRob Sjostedt
Life of this patent
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Abstract
Device, system, and method to adhesively bond a sleeve to a mandrel are disclosed. The sleeve and the mandrel may be used as part of frac plug or a bridge plug in oil and gas applications. The bonded adhesive connection with grooves is strengthened to reliably achieve higher levels of lap shear strengths than attainable by conventional means.
Claims20
A method for increasing adhesive bond strength of a composite sleeve to a mandrel comprising a longitudinal axis, said method comprising:
- machining a plurality of grooves on an exterior surface of the mandrel along the longitudinal axis of the mandrel;
- applying adhesive to the axial grooves;
- and
- placing the sleeve over the mandrel.
A method for enhancing lap shear strength of an adhesive bond between a composite sleeve and an elongated mandrel comprising a bore;
- said method comprising:
- machining a plurality of grooves on an exterior surface of the mandrel along a longitudinal axis of the mandrel, each of said grooves comprising a bottom surface, two sidewalls, a groove depth, and a groove width;
- applying adhesive to the axial grooves;
- and
- placing the composite sleeve over the mandrel and providing a clearance between an inside surface of the sleeve and the exterior surface of the mandrel.
A composite high strength structure comprising:
- a composite mandrel comprising an elongated body comprising a length, an exterior surface, and a bore comprising an interior bore surface;
- a composite sleeve comprising an elongated body comprising a length, an exterior surface, and a bore comprising an interior bore surface placed over at least part of the exterior surface of the mandrel and defining an overlapped section;
- a plurality of spaced apart grooves located at the overlapped section, each of said groove comprising a length, a width, and a depth;
- and
- cured adhesive located in the plurality of spaced apart grooves.
Dependencies are inferred from the claim text.