Linear Drive Assembly with Rotary Union for Well Head Applications and Method Implemented Thereby

Abstract

A drive assembly for a progressive cavity pump includes a frame supported by the wel piping and a polish rod connected to the sucker rod. The polish rod is received by a rotary union formed by a sleeve portion rotatable with respect to a body portion with a seal structure that seals the sleeve and body portions during rotation. A mechanical drive, such as a hydraulic motor, electric motor or engine, has an output shaft that is linear with the polish rod and that has an axial passageway which receives the polish rod. A coupler mechanically couples an upper portion of the polish rod to the output shaft. The invention also includes a method of rotating a progressive cavity pump by this assembly.

Description

FIELD OF THE INVENTION[0001]The present invention broadly concerns wells and drive assemblies therefore along with methods for pumping fluids from a down hole location in the well to the surface. More particularly, the present invention is directed to a linear drive assembly and pump assemblies incorporating in the same so that torque forces on the assembly are reduced. The invention specifically is directed to a drive assembly for a progressive cavity pump. The invention also relates to a rotary seal that may be used with these and other pump assemblies. Further, the invention is directed to methods accomplished by these pump assemblies.BACKGROUND OF THE INVENTION[0002]Since ancient days, humankind has been known to settle around convenient sources of fresh water, such as lakes, rivers, streams, springs and the like. These sources are normally exposed at the surface of the earth for ready access. However, early on it was further learned that subterranean water supplies could be tap...

AI Technical Summary

Benefits of technology

[0011]It is a further object of the present invention to provide a drive assembly and method for a pump that eliminates torque forces resulting from offset side mounting of the drive assembly.

Problems solved by technology

Problems result from this solution to providing a rotary seal, however.

For example, if the carbon-impregnated rope is compressed too much against the polish rod, abrasion will form a groove in the polish rod which can cause severe leakage of the system.

Such leakage is not only uneconomical, but it may also result in environmental damage.

Indeed, such wells are monitored for leakage and any discovered leakage may result in a large fine to the operator.

Such motors are usually constant speeds unless provided with fairly complicated and expensive frequency controller.

Various bearings in the assembly may become worn because of the torque created by the offset drive.

The drive belts can wear and stretch so that substantial maintenance must be provided to maintain proper tensioning of the belt.

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