Patent ID: 7316268
Filing Date: 2008-01-08
Classification: E21B

Abstract:
1. In combination: a sucker rod for a wellbore having a downhole pump and adapted to introduce a conditioning fluid during production pumping of a well, the sucker rod being assembled into a hollow pumping string and being made of steel, profiled and threaded at both ends, the sucker rod comprising two sucker rod heads that are tubular, welded to the ends of a tube made of steel, thus forming a continuous tube through which the conditioning fluid can flow and an electric or optical cable can be pulled through, or set inside, each head having an inner hole of cylindrical section from a top end of the sucker rod thread down to approximately the lower end of an upset bead of the head of the sucker rod, the cylindrical section being followed by a conical section and ending with another cylindrical section extending all the way through a welding zone of the head of the sucker rod, between the conical section and the cylindrical section there being provided a radius that works as a stress relief: a hollow rotor of a progressive-cavity pump, used to pump the well concomitantly with injecting conditioning fluids; and electrical/optical cables passing through the string, the cables transmitting to the surface signals about properties of the wellbore fluids or pump status, signals generated by adequate transducers mounted on the sucker rod string or pump, or transmitting power from the surface to downhole electrical motors used to drive progressive-cavity-pump, screw or electrical-submersible pumps.