Linear Drive Assembly with Rotary Union for Well Head Applications and Method Implemented Thereby
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[0034]The present invention broadly concerns drive assemblies and methods for driving a progressive cavity pump that is located down hole in a well. Here, such wells are known to be provided having a casing interior and a sucker rod located in a delivery tube within the casing interior whereby rotation of the sucker rod acts to rotate the progressive cavity pump. In the exemplary embodiments, the drive assembly is a linear drive having an output shaft that is coaxial with a polish rod that is connected to the sucker rod. Another aspect of the exemplary embodiments of the present invention includes a rotary union that substantially seals the production flow through the delivery tube and that includes a friction cap that seals against the polish rod with the rotary union providing a rotary seal whereby the polish rod may be rotated in a substantially sealed rotation in the rotary union.
[0035]In order to introduce the aspects of the present invention, reference may be first made to FIG...
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