Molded composite mandrel for a downhole zonal isolation tool

摘要

A composite mandrel includes a filament-wound composite tube, and composite material molded over the filament-wound composite tube. For example, the composite material includes chopped fibers and a matrix of thermoset resin. The chopped fibers are arranged in layers upon the filament-wound composite tube, and the chopped fibers in each of the layers are randomly oriented along first and second orthogonal directions in each of the layers. The composite material includes at least one sheet of the composite material wound over the filament-wound tube, and at least one strip of the composite material wound over the sheet of the composite material and forming a head on the composite mandrel. An internal cavity of the filament-wound composite tube may provide a lumen for the composite mandrel. The internal cavity may be threaded to receive a removable bridge plug.

主权项

1. A composite mandrel comprising;
a filament-wound composite tube; and composite material molded over the filament-wound composite tube; wherein the composite material includes chopped fibers and a matrix of thermoset resin; wherein the chopped fibers are arranged in layers upon the filament-wound composite tube, and the chopped fibers in each of the layers are randomly oriented along first and second orthogonal directions in said each of the layers; wherein the composite mandrel is suitable for use as a central component of a down-hole tool; and wherein the chopped fibers are parallel to planar interfaces between adjacent layers.