Well pumping system with linear induction motor device
OwnerLewis E. Massieinventor
Life of this patent
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Abstract
Fluid wells, particularly oil wells, exert heavy shock loads on the string of sucker rods extending down to the fluid pump located adjacent to the producing formation. A conventional rocker arm must lift the sucker rods the column of oil in the casing plus the weight of the fluid pump, overcome the inertial load and then come to a stop before reversing the stroke. The employment of linear induction motors to reciprocate the oil well rocker arm and then operate as a generator on the reverse stroke reduces the shock loading and the returns the generated electrical energy to the well pumping system. The instant invention greatly reduces the maintenance costs of a conventional oil well and provides greater efficiency of the well pumping system.
Claims2
A well pumping system with linear induction motor drive wherein a rocker arm pivotally supported intermediate its ends, a first end of which is attached to a sucker rod and the second end portion attached to a base mounted linear induction motor wherein the improvement comprises:
- (a) a series of equal length, electrically activable stators arranged consecutively along a linear path;
- (b) a magnetic portion, cooperative with said stators for electrically moving a power output rod along said path;
- (c) switching means disposed along said path which are sequentially energized at a predetermined position of said magnetic portion for switching on or off, the power applied to each stator;
- (d) non-magnetic rods providing slidable support for said magnetic portion along said path;
- (e) a load support rod fastened to the top surface of said magnetic portion;
- (f) switch actuating means attached to said magnetic portion;
- (g) said switching means aligned with a switching means support structure extending the length of the assembled stators;
- (h) individual switching means electrically connected to the field winding of the associated stator, and
- (i) the spacing between consecutive stators adjustable by selected spacers to the needs for accelerating and braking the velocity of the magnetic portion.
Dependencies are inferred from the claim text.