Results 51 to 60 of about 176 (133)
Dynamometric study of rod pumps with physical wear [PDF]
E3S Web of ConferencesRod pumping units are widely used in mature oil fields to artificially lift crude oil to the surface. However, during operation, common failures include rod breaks, pump valve malfunctions, and stuck rods.
Ponikarov Sergey, Ponikarov Artem
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Advanced Functional Materials, Volume 36, Issue 50, 22 June 2026.First vacuum formed spherical triboelectric converter for 3D‐omnidirectional ultrasonic energy receiving, with configurable DC or pulse outputs for versatile applications. ABSTRACT Ultrasound‐driven triboelectric nanogenerators (UD‐TENGs) have emerged as promising ultrasonic energy converters for underwater and biomedical applications.
Yanqin Huang +12 more
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Biological Reviews, Volume 101, Issue 3, Page 1406-1462, June 2026.ABSTRACT Oropharyngeal food processing exhibits a remarkable diversity among vertebrates, reflecting the evolution of specialised ‘processing centres’ associated with the mandibular, hyoid, and branchial arches. Although studies have detailed various food‐processing strategies and mechanisms across vertebrates, a coherent and comprehensive terminology ...
Daniel Schwarz +6 more
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Research on Fault Diagnosis Method for the Sucker Rod Pump Injection-production System
Shiyou jixie, 2018 Compared with the conventional single-pump system, the structure of the sucker rod pump injection-production system is more complicated and its downhole working conditions is harsher.
Jiang Minzheng +4 more
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Eccentric Wear Mechanism and Centralizer Layout Design in 3D Curved Wellbores
Applied SciencesIn deep oil and gas wells, sucker rod strings (SRS) frequently experience breakage and eccentric wear problems. To address this engineering challenge, this study establishes a new coupled three-dimensional (3D) mechanical-mathematical model for sucker ...
Ziming Feng +3 more
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Developmental Dynamics, Volume 255, Issue 6, Page 533-547, June 2026.Abstract Background Previous experiments inducing leakage of embryonic cerebrospinal fluid (CSF) suggest the necessity of intraventricular CSF pressure (PCSF) for brain morphogenesis. Nevertheless, how embryonic PCSF occurs is unclear, especially in utero. Results Using a Landis water manometer, we measured PCSF in fetal mice isolated from the amniotic
Koichiro Tsujikawa +2 more
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RS-LVQ-based Fault Diagnosis of the Injection-production System
Shiyou jixie, 2018 Aiming at the unconventional structure of the sucker rod pump injection-production system, an inverse calculation method was proposed. The fault diagnosis model was established and solved.
Jiang Minzheng +4 more
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Geofluids, 2020 Based on the informatization and intelligent construction of an oilfield, this paper proposes a new method for calculating inflow performance relationship in sucker rod pump wells, which solves the limitations of current IPR curve calculation method in ...
Ruichao Zhang +3 more
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Application and Node Mechanics Analysis of Sucker Rod Pump Injection-production System
Shiyou jixie, 2017 To achieve effective production stabilization and water-cut control in extra-high water-cut wells, a sucker rod pump injection-production system has been designed. The system uses gravity to separate the oil and water in the downhole. The separated water
Jiang Minzheng +3 more
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Design of the Polished Rod Load Simulation System for Pumping Unit Type Test
Shiyou jixie, 2017 To simulate the polished rod load of the pumping unit, a new polished rod load simulation test device has been designed. In the simulation test device, throttle valve and relief valve has been used to simulate the oil load of pumping unit, the heavy load
Wang Hongbo +3 more
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