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:
Feb. 05, 2019
Filed:
Jan. 11, 2016
Weatherford Technology Holdings, Llc, Houston, TX (US);
Clark E. Robison, Tomball, TX (US);
Benson Thomas, Pearland, TX (US);
William C. Lane, The Woodlands, TX (US);
Darius John Yakimchuk, St. Albert, CA;
Jeffrey John Lembcke, Cypress, TX (US);
Bryan A. Paulet, Spring, TX (US);
Brandon M. Cain, Houston, TX (US);
Sean M. Christian, Sparrows Point, MD (US);
Paul L. Smith, Katy, TX (US);
WEATHERFORD TECHNOLOGY HOLDINGS, LLC, Houstone, TX (US);
Abstract
A long-stroke pumping unit includes a tower; a counterweight assembly movable along the tower; a drum connected to an upper end of the tower and rotatable relative thereto. The unit also includes a belt having a first end connected to the counterweight assembly, extending over the drum, and having a second end connectable to a rod string. The unit further includes a prime mover for reciprocating the counterweight assembly along the tower; a sensor for detecting sudden acceleration of the counterweight assembly due to failure of the rod string; and a controller in communication with the sensor and operable to activate the braking or arrestor system in response to detection of the sudden acceleration. The unit further includes at least one of a braking system for halting free-fall of the counterweight assembly; and an arrestor system for absorbing kinetic energy of the falling counterweight assembly.