Electricity: measuring and testing – Magnetic – Displacement
Patent
1988-10-24
1990-11-06
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
324172, 324206, 3242074, 417 63, G01B 714, G01P 350, F04B 2100
Patent
active
049689347
ABSTRACT:
Method and apparatus for the measurement of the displacement, and if desired, the force on movable equipment in the production pipe of a pumped well, for example, a pump rod or sucker rod near the pump at the bottom of a well. The force on the rod is measured with a load sensing device connected to a lower rod. The displacement is measured by creating equally spaced apart magnetic marks or poles on the internal wall of the production pipe, detecting the marks, and then erasing the marks, so they do not interfere with marks created and detected when the direction of displacement is reversed. A new mark is created each time a mark is detected, and the equal displacement distance between detected marks is compared with the corresponding elapsed time to determine the displacement and velocity of the rod. A diagram of force-displacement can be made from the measurement data to enable the pump, or other movable equipment to be operated at optimum conditions.
REFERENCES:
patent: 3466535 (1969-09-01), Sterns et al.
patent: 4560928 (1985-12-01), Hayward
Jacquet Bernard
Robinet Alain
Societe Nationale Elf Aquitaine
Strecker Gerard R.
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