Patent ID: 7287591
Filing Date: 2007-10-30
Classification: E21B

Abstract:
1. An apparatus for setting material into a zone of interest within a wellbore, the apparatus comprising: a top section having a means for transferring electrical power from a surface power supply through the top section; a reversible motor coupled to the top section and capable of receiving electrical power from the top section, the motor having a rotational output shaft; a bottom section having a top portion and a bottom portion, the top portion comprising a sealing member sealing the top portion from the bottom portion; a reversible means for transferring work from the rotational output shaft to the bottom section capable of moving the sealing member from the top portion of the bottom section into the bottom portion of the bottom section thereby breaking the seal between the top portion and the bottom portion and allowing material to be set within a zone of interest, as well as being capable of moving the sealing member from the bottom portion of the bottom section into the top portion of the bottom section thereby sealing the top portion from the bottom portion after material has been set within a zone of interest; wherein the top section further comprises a tubular body having a bore defined therethrough and the means for transferring electrical power through the top section comprises an insulating member disposed within the bore of the tubular body, the insulating member having an electrical contact that connects to a positive lead from the surface power supply and a bore therethrough for passage of a negative lead of the surface power supply, and wherein the reversible motor further comprises a positive terminal and a negative terminal that are connected to the electrical contact and the negative lead, respectively; wherein the reversible motor rotates in one direction with the application of the surface power supply of a given polarity and rotates in the opposite direction with the application of the surface power supply of an opposite polarity; and wherein the reversible means for transferring work from the rotational output shaft to the bottom section comprises a primary lead screw mechanically coupled to the rotational output shaft of the motor, the primary lead screw having a externally threaded surface, a secondary lead screw having a upper portion comprising a substantially cylindrical body having a bore defined therethrough with an internally threaded surface capable of rotationally engaging the externally threaded surface of the primary lead screw, a bottom portion having an externally threaded surface, the bottom portion coupled to the upper portion such that when the primary lead screw rotates in one direction within the upper portion, the bottom portion of the secondary lead screw moves in an axial direction and when the primary lead screw rotates in the opposite direction within the upper portion, the bottom portion of the secondary lead screw moves in the opposite axial direction, and a coupling means connecting the bottom portion of the secondary lead screw to the bottom section such that the axial motion of the bottom portion in one direction moves the sealing member from the top portion of the bottom section into the bottom portion of the bottom section and the axial motion of the bottom portion in the opposite direction moves the sealing member from the bottom portion of the bottom section into the top portion of the bottom section.