E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/10 (2006.01) E21B 17/18 (2006.01) F04B 47/02 (2006.01)
Patent
CA 2261299
A rod guide fixedly molded around the shank of a sucker rod string with the rod guide including a radially inner non-erodible zone and a radially outer erodible zone. The non- erodible zone includes a radially inner substantially sleeve-shaped portion having an inner cylindrical surface for gripping engagement with the rod. A plurality of flow through channels are spaced outward of the substantially sleeve-shaped portion. Each flow through channel extends axially along the rod guide and has a maximum circumferential width greater than any gap in the radially outer surface of the erodible zone circumferentially aligned with and radially outward of the respective flow through channel. The radially outer surface of the erodible zone may have a cylindrical outer configuration, such that a radially outward substantially sleeve-shaped portion is provided for engagement with the tubing. The upper and lower surfaces of the rod guide may each be inclined such that the radially outer surface of the rod guide extends longitudinally in excess of the inner cylindrical surface of the sleeve- shaped portion and in engagement with the rod. A guided sucker rod includes an elongate rod having threaded end connectors for mating engagement with an adjoining sucker rod and one or more rod guides fixedly molded thereon. According to the method of the invention, left-side and right-side molds are created each including one or more elongate cavity creating member supported in a cantilevered fashion from a supporting end block. A plastic material is injected into the mold cavity, and the supporting end block is then moved longitudinally along the axis of the rod to remove the one or more channel performing members from the molded rod guide.
Evans Thomas E.
Hoff H. Milton
Ray Randall G.
Finlayson & Singlehurst
Flow Control Equipment Inc.
Robbins & Myers Energy Systems L.p.
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