Abstract: The disclosure relates to a sucker rod assembly for use in an oil well. The sucker rod assembly includes an elongated hollow rod having a threaded section at an end, a tubular connector having a threaded section at one end for engaging with the threaded section of the elongated hollow rod, and a second threaded section at the other end, and a tubular coupling having a threaded section at each end for engaging with the second threaded section of said tubular connector and with a second tubular coupling or sucker rod. The hollow rod, connector and coupling form a continuous hollow core for carrying fluid, cables, fiber optics or other materials.

Abstract: An apparatus including a sleeve and a tag embedded into the sleeve by injection molding. The sleeve may include an outer wear resistant surface. The surface comprising a plurality of integral grooves traversing angularly along the surface. The sleeve may include a wear cage. The wear cage may include two rigid fiber reinforced polymer symmetrical halves, couplable to each other, wherein each symmetrical halve may include, an inner surface, a channel integral along the full circumferential length of the inner surface, an outer surface, and a plurality of annular elements separated by stand-offs.

Abstract: The present invention is directed to a tubular centralization system for completing oil, gas, geothermal and other types of wells where the temperatures may be high or the side loads are high, or both. A centralizer has a ring-shaped main body having an inner surface and an outer surface, with a central axis of rotation that passes through the open or hollow centre of the ring from a first open end to a second open end. A plurality of elongate blades extend from the outer surface of the body with each blade forming a wave form with at least two peaks and troughs along the length of the blade.