Well Fluid Extraction System

Abstract

The invention relates to a well fluid extraction system using a progressive cavity pump; comprising a stator, a rotor; a rotating drive rod, and a drive motor; the rotor is installed in the stator and has an external threaded curve surface; and the rotating rod is connected to the rotor; the drive motor, a fluid outlet of the progressive cavity pump is connected to an input end of a tank or a fluid pipeline; a fluid inlet immersed in a reservoir in the production zone of a well including a well head and a well casing; at least one torque sensor; which measures the torque of the rotating rod in a non-contact way, and includes a sensor housing supported by a mounting assembly adapted to be connected to the well head or well casing and comprising at least one elongate axially orientated support for the sensor housing.

What is claimed is: 
     
         1 . A well fluid extraction system using a progressive cavity pump; wherein the progressive cavity pump comprises: a stator, a rotor, a rotating drive rod, and a drive motor; the rotor is installed in the stator and has an external threaded curve surface; and the rotating rod is connected to the rotor; the drive motor, and the rotating rod are connected in sequence; a fluid outlet of the progressive cavity pump is connected to an input end of a tank or a fluid pipeline; a fluid inlet immersed in a reservoir in the production zone of a well including a well head and a well casing; at least one torque sensor; the torque sensor measures the torque of the rotating rod in a non-contact way, and comprises a sensor housing, and at least one torque sensor located in the sensor housing, adjacent to the rotating rod, to provide an indication of the torque present in the rotating rod whilst the rod is rotating, from which data relating to the properties of the produced well fluids in the reservoir may be determined, wherein the sensor housing is supported by a mounting assembly adapted to be connected to the well head or well casing and comprising at least one elongate axially orientated support for the sensor housing. 
     
     
         2 . A well fluid extraction system according to  claim 1  wherein at the end adjacent the drive motor, the rotating rod includes a polished portion adjacent to which the torque sensor is located. 
     
     
         3 . A well fluid extraction system according to  claim 1  wherein the sensor housing includes first and second sensors are located in the housing in diametrically opposed positions in relation to the rotating rod when the sensor housing is in an installed position. 
     
     
         4 . A well fluid extraction system according to  claim 1 , wherein the first sensor includes a magnetic field generating coil and/or a magnetic field measuring coil. 
     
     
         5 . A well fluid extraction system according to  claim 1  wherein the mounting assembly includes a housing support plate to which the sensor housing is attached. 
     
     
         6 . A well fluid extraction system according to  claim 5  wherein the housing support plate is U-shaped and comprises first and second wing arms. 
     
     
         7 . A well fluid extraction system according to  claim 6  wherein two axial supports are provided, attached to each first and second wing arm. 
     
     
         8 . A well fluid extraction system according to  claim 5  wherein the mounting assembly includes a mounting plate having attachment means for attaching the mounting assembly to the well head or well casing. 
     
     
         9 . A well fluid extraction system according to  claim 8  wherein the mounting plate is spaced axially from the sensor support plate and wherein the elongate axial support extends axially from the sensor support plate to the mounting plate mounting 
     
     
         10 . A well fluid extraction system according to  claim 3 , wherein the housing comprises a first housing portion in which the first sensor is located and a second housing portion in which the second sensor is located and the first and second housing portions are spaced from each other to provide an opening through which the rotating rod extends. 
     
     
         11 . A well fluid extraction system according to  claim 10 , wherein the first and second housing portions are connected together by a connecting plate  29  such that the opening is formed between the first and second housing portions. 
     
     
         12 . A well fluid extraction system according to  claim 7 , wherein the first and second housing portions each comprise a cylindrical casing sized to surround the sensor and end caps to close each end of the casing forming an complete enclosures around the sensor. 
     
     
         13 . A well fluid extraction system according to  claim 1 , wherein power and data transmission means are provided extending from each sensor to a connector arranged on the outside of the housing cable. 
     
     
         14 . A well fluid extraction system according to  claim 1 , wherein the well fluid extraction system further comprises a monitoring and control mechanism, and the monitoring and control mechanism comprises a controller connected to the motor  6 . 
     
     
         15 . A well fluid extraction system according to  claim 1 , wherein the mounting assembly is resiliently mounted to provide resilient support to the sensor housing. 
     
     
         16 . A well fluid extraction system according to  claim 1 , wherein the elongate axial support  14  is in the form of at least two springs.