Pump control system for a downhole motor-pump assembly and method of using same
First Claim
1. A system for pumping oil well fluids from downhole to the ground surface comprising:
- a surface monitoring station for communicating with at least one remote downhole motor-pump assembly;
said motor-pump assembly including a downhole motor-pump cartridge unit for pumping the well fluids to the ground surface, and a surface motor controller for controlling a linear direct current motor disposed in said motor-pump cartridge unit;
said linear direct current motor including an armature assembly, said motor being coupled to said surface controller by control cable means carrying high voltage direct current pulses to cause said armature assembly in said linear direct current motor to be moved rectilinearly reciprocatively for fluid pumping purposes; and
said control cable means further simultaneously carrying low voltage frequency modulated carrier signals for communicating with a downhole motor control electronic unit disposed in said motor-pump cartridge unit to couple said high voltage pulses to selected ones of a plurality of stator pulse coils for causing said armature assembly to be moved rectilinearly reciprocatively.
2 Assignments
0 Petitions
Accused Products
Abstract
A new and improved control system for monitoring and controlling the operation of a downhole linear d.c. motor-pump assembly and a method of using it for producing a sufficient reciprocating pumping action to lift well fluid through the producing tubing of a well to the ground surface. The system includes a surface monitoring station that is in radio communication with a plurality of remote downhole motor-pump assemblies. Each motor-pump assembly has a surface motor controller, a downhole motor-pump cartridge unit that is adapted to be received in a downhole cartridge sleeve assembly that maintains the cartridge unit in a stationary position for pumping purposes. The motor-pump cartridge unit may be raised or lowered by a control cable within the production tubing for helping to facilitate the repair or replacement of the motor-pump cartridge unit. The motor-pump assembly also includes a plurality of sensors for monitoring the conditions of the well downhole as well as the efficiency of the motor-pump cartridge unit.
-
Citations
20 Claims
-
1. A system for pumping oil well fluids from downhole to the ground surface comprising:
-
a surface monitoring station for communicating with at least one remote downhole motor-pump assembly; said motor-pump assembly including a downhole motor-pump cartridge unit for pumping the well fluids to the ground surface, and a surface motor controller for controlling a linear direct current motor disposed in said motor-pump cartridge unit; said linear direct current motor including an armature assembly, said motor being coupled to said surface controller by control cable means carrying high voltage direct current pulses to cause said armature assembly in said linear direct current motor to be moved rectilinearly reciprocatively for fluid pumping purposes; and said control cable means further simultaneously carrying low voltage frequency modulated carrier signals for communicating with a downhole motor control electronic unit disposed in said motor-pump cartridge unit to couple said high voltage pulses to selected ones of a plurality of stator pulse coils for causing said armature assembly to be moved rectilinearly reciprocatively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A system for pumping well fluids from well, comprising:
-
pump means including chamber means for receiving a quantity of well fluid to be pumped to the surface and piston means reciprocatively mounted within said chamber means for pumping well fluids to the surface; motor means coupled to said piston means for moving said piston means rectilinearly reciprocatively within said chamber means to cause well fluids to be pumped to the ground surface; said motor means including an elongated stator having a set of coils mounted spaced-apart therealong and having an armature driven by said coils; means for sensing the position of said armature relative to said coils; surface motor controller means disposed above ground and responsive to said means for sensing for generating control signals to control the operation of said motor means; high voltage pulse means responsive to said surface motor controller means for generating high voltage pulses to energize said motor means with electrical power; downhole control means disposed in the well and responsive to said surface motor controller means for causing individual ones of said high voltage pulses to be directed to selected ones of said coils; power switch means responsive to said downhole control means for directing said high voltage pulses to selected individual ones of said coils; and cable means for coupling said motor controller means to said control means, for establishing a bidirectional communication patch between said surface motor controller and said downhole control means and for coupling said high voltage pulse means to said power switch means for establishing a one way coil energizing path between said high voltage pulse means and said power switch means.
-
Specification