Sucker rod pump automated control method and system

Abstract

A sucker rod pump automated control method comprising measuring the sucker rod pump parameters, counting the sucker rod pump geometry, forming a dynamometer card of the sucker rod pump parameters. Measuring an angle of the sucker rod pump walking beam, and based on the walking beam angle value, forming a real time value of the sucker rod pump crank angle and a polished rod velocity with using geometry dependences of the sucker rod pump components. The walking beam is equipped with an angle sensor connected to a PC input and is formed to detecting position of the walking beam.

1 . A sucker rod pump automated control method comprising:
 measuring the sucker rod pump parameters,   counting the sucker rod pump geometry,   forming a dynamometer card of the sucker rod pump parameters,   providing the sucker rod pump motor control signals depending on measured parameters,   the measured parameters comprising at least a load or/and a velocity of a polished rod,   wherein at least the motor torque, the polished rod load or/and velocity are calculated based on mass and geometry values of the sucker rod pump components with counting current and voltage parameters;
 calculating the motor momentary power value (MMP) and a counter weight system power (CWP) during each reciprocating stroke of the polished rod, 
 and using a variable speed drive (VSD) active power value excluding a losses, 
 wherein calculating the active power value based on a frequency setting (f) value, 
 wherein changing the frequency setting (f) value relative to the sucker rod pump filling rate; 
 wherein measuring the angle of the sucker rod pump walking beam, 
 and based on the walking beam angle value, 
 forming the real time values of the sucker rod pump crank angle and the polished rod velocity with using geometry dependences of the sucker rod pump components. 
   
     
     
         2 . The method according to  claim 1  wherein obtaining the motor torque average value by:
 comparing the motor torque average value relative to the motor torque reference value, wherein 
 taking the motor torque reference value calculated on a first sucker rod pump stroke, and 
 taking the motor torque reference value calculated on low motor velocity, 
 wherein said motor torque reference value showing a ratio between the motor torque average value and the sucker rod pump filling rate, 
 wherein at least the sucker rod pump filling rate reflects changing of the polished rod load. 
 
     
     
         3 . The method according to  claim 1  and  2  wherein
 calculating the motor torque average value during each reciprocation period of the polished rod, wherein the reciprocation period start is related to the polished rod end point. 
 
     
     
         4 . The method according to  claim 1  wherein calculating a current motor power expended in motion of the polished rod,
 forming a current motor power based on the VSD active power value excluding the losses, 
 wherein calculating a stator and a rotor power losses of the motor, and
 taking into account the sucker rod pump dynamic moment and a mechanical losses within the sucker rod pump swing joints. 
 
 
     
     
         5 . The method according to  claim 1  wherein using the VSD programmable controller, forming a surface and a down hole dynamometer card of the sucker rod pump parameters,
 wherein calculating the motor momentary power value (MMP), the counter weight system power (CWP), the polished rod load or/and velocity. 
 
     
     
         6 . The method according to  claim 1  wherein based on the sucker rod pump parameters dynamometer card forming the frequency settings value and calculating the VSD output voltage. 
     
     
         7 . The method according to  claim 1  wherein calculating geometry dependences of the sucker rod pump components via dimensioning,
 wherein using the geometry dependences for calculating the counter weight system power (CWP), the polished rod load or/and velocity. 
 
     
     
         8 . The method according to  claim 1  wherein calculating the load zero portion at the polished rod end points,
 wherein the load zero portion is forming a part of the polished road stroke length, 
 wherein forming the polished rod load constant value at an input/output of the zero portion, 
 wherein forming an intermediate load value as a calculated mathematic value. 
 
     
     
         9 . A sucker rod pump automated control system comprising: a variable speed drive (VSD) equipped with a programmable controller (PC) and connected with a motor,
 the motor is designed as a drive for the sucker rod pump crank,   wherein the sucker rod pump crank is in cinematic connection with a walking beam which is connected to a polished rod;   wherein the walking beam is equipped with an angle sensor connected to the PC input and is formed to detecting position of the walking beam,   wherein the PC input contains a galvanic isolation of a power supply,   wherein said PC comprising: a means of the crank position detection based on the detected position of the walking beam,   a means of the sucker rod pump geometry dependences calculation,   a means of the motor power calculation and a counter weight system power (CWP) calculation,   a means of the polished rod load or/and velocity calculation,   a means of data processing and forming a surface and a down hole dynamometer card of the sucker rod pump parameters.   
     
     
         10 . The sucker rod pump automated control system according to  claim 9  wherein the means of the motor power calculation comprising a block of a stator and a rotor power losses calculation and a block of the sucker rod pump dynamic moment calculation.