The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 30, 2021
Filed:
Apr. 08, 2019
Weatherford Technology Holdings, Llc, Houston, TX (US);
Clark E. Robison, Tomball, TX (US);
Benson Thomas, Pearland, TX (US);
Sean M. Christian, Fort Howard, MD (US);
Weatherford Technology Holdings, LLC, Houston, TX (US);
Abstract
A long stroke pumping unit includes a tower and a counterweight assembly movable along the tower. A belt includes a first end connected to the counterweight assembly and a second end connectable to a rod string. A prime mover is used to reciprocate the counterweight assembly along the tower. A sensor detects the position of the counterweight assembly, and a load cell measures the force exerted on the rod string. A motor is provided to adjust an effective weight of the counterweight assembly during reciprocation thereof along the tower. A controller communicates data with the sensor and the load cell and controls the adjustment force exerted by the adjustment motor.