Abstract: A sucker rod string improved by the use of wear resistant, high temperature resistant, fiber-reinforced phenolic composite materials as centralizing guides on sucker rods and couplings, both molded on the rod and prepared as snap-on couplings for in-the-field use, and on magnet rod inserts, both rod box and pin magnet rod inserts, in which the thermosetting composites are used as sleeves, encapsulating housings, and centralizing guides. The magnet rod inserts and couplings are designed to be machined so that worn phenolic composite can be removed and replaced with fresh composite without removing or damaging the magnet. Processes are disclosed for integrating composite thermoset molding into sucker rod, coupling, and magnet rod insert manufacture and for refurbishing used components of a sucker rod string.

Abstract: A sucker-rod pumping system includes diametrically charged rare earth magnets having significant monopolar character mounted on the rod string and, optionally, within a magnet barrel below the pump barrel. The magnets are jacketed to preclude contact with crude petroleum. The magnets subject the petroleum to a significant magnetic flux to substantially preclude precipitation of paraffins and asphaltenes with a minimum of retrofit to existing equipment and without substantially altering the operation of the rod string.