Wells – With electrical means – Electrical motor
Patent
1985-03-21
1987-08-18
Novosad, Stephen J.
Wells
With electrical means
Electrical motor
166 665, 166 68, 166105, 417417, E21B 4300, F04B 1704
Patent
active
046870547
ABSTRACT:
Apparatus and method for operating a downhole sucker rod pump in which a downhole linear motor is controlled by a surface digital computer. The motor includes a number of coil sections circumfusing and spaced along the length of a non-magnetic tube, and an armature positioned coaxially inside the tube. The armature section includes a central mandrel of a non-magnetic material and a number of laminated armature sections circumfusing and spaced along the length of the mandrel. The tube is sized substantially the same as the production tubing, and the armature is not physically connected to the tube, such that the armature and the attached pump can be removed without removing the tubing. The coils are energized by electric power supplied by three electric conductors running from the surface. The power is selectively applied to each of the conductors in a predetermined sequence by a number of SCR switching devices controlled by the digital computer, such that the field coils are energized in manner to provide the proper attractive and repulsive forces to the armature section to cause it to move in the desired direction. By properly controlling the power switching sequence, the stroke length, speed, and duty cycle can be programmed and controlled.
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Russell George W.
Underwood Larry B.
Dang Hoang C.
Novosad Stephen J.
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