|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||417/12 ; 417/18 ; 417/44 ; 417/63|
|발명자 / 주소|
|인용정보||피인용 횟수 : 22 인용 특허 : 0|
A method and apparatus for vertically adjusting the stroke of the polished rod of a pumpjack during its operation in a producing well, while detecting abnormal conditions such as gas-off, pump seizure, sucker and separation, gas-lock pounding or fluid pounding. The method and apparatus involves a hydraulic or pneumatic cylinder interposed between the polished rod clamp and the carrier bar of the pumpjack. Abnormal conditions are detected by an electronic device incorporating a pressure transducer which senses fluid pressure changes in the hydraulic or pn...
An electronic fluid pump controller and electronic artificial lift motor controller for determining whether an emergency condition exits in a fluid pressure cylinder associated with an artificial lift apparatus used in an operating well, comprising: a pumpjack operationally connected to the artificial lift apparatus; a fluid pressure cylinder; a fluid pressure transducer for measuring the fluid pressure within said fluid pressure cylinder, said fluid pressure transducer producing an electrical signal proportional to the fluid pressure within said cylinde...