Abstract: A rod guide for maintaining a rod of a sucker rod string in substantially central position in a well tubing during reciprocal movement of the sucker rod string in the well tubing.

Abstract: A guide for the rods of a rod string having a plurality of of units spaced longitudinally on the shank of the rod to provide a flex rod portion therebetween and a method of and apparatus for installing the guide unit on the shank.

Abstract: Corrosion control cathodic protection for the rod string and the well tubing. Anode assemblies for mounting on the rods of the rod string.

Abstract: A field-installable rod guide firmly grasps the sucker rod to which it is attached and reduces fluid friction to axial movement of the rod guide. The rod guide includes one or more channels for fluid to flow by the guide through straight or helical vanes. An axial access channel which permits application of the rod guide onto a sucker rod has a wide, tapered mouth to minimize the length of time during which the guide is stretched during installation. Recognizing that some stretch is inevitable in the guide at the point opposite the axial access channel, more rod guide material is placed at this point of greater stretch. In a preferred embodiment of the present invention, the rod guide stock from which the rod guide is machined is extruded to form the desired vanes as well as a non-circular "rod hole."This way, a "dual-radius" hole is enabled. The dual-radius hole narrows the gripping radius of the guide to solidly grasp the rod and eliminate slipping of the guide on the rod.

Abstract: A rod guide assembly having a mount moulded on the rod guide shank and a centralizer rotatably mounted on the mount and the method of installing the assembly on a rod guide shank.

Abstract: A sinker bar connectable to other sinker bars, sucker rods and the reciprocable operator of a down hole pump by use of conventional elevator and hoist connectors without the use of auxiliary devices such as pony sucker rods, the sinker bar having a reduced intermediate portion below the top portion thereof engageable by a conventional elevator connector and an external annular groove in the top portion constituting means engageable by a conventional hoist connector.