caa a22 4500 606226141 CHVBK 20210128101151.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s10553-015-0614-9 doi (NATIONALLICENCE)springer-10.1007/s10553-015-0614-9 Two Techniques for Reducing Sucker-Rod Loads in Deep Wells [Elektronische Daten] [Xueqi Cen, Xiaodong Wu, Sheng-en Gao] Deep and superdeep reservoirs over 5000 m deep are continually being discovered and developed in Western China, particularly in the Tarim Basin. The low pressure in these reservoirs makes it necessary to run sucker-rod pumps to great depths, which increases the load on the polished rod and creates pumping problems in deep wells. This study examines two rod-load-reduction techniques for deep wells, one using composite fiberglass-steel rods and the other using load reducers for the rods. The effects of these techniques on polished-rod load reduction are evaluated by calculation based on well operation data and comparison of the two techniques. Energy efficiency is analyzed by calculating the torque based on the difference between the maximum and minimum loads on the polished rod. The study results show that composite fiberglass-steel rods reduce the maximum load by 35.7% and that the load reducer decreases the load by an average of 22.8%, which is a significant outcome. The composite fiberglass-steel rod is more energy efficient than the load reducer. Springer Science+Business Media New York, 2015 deep wells nationallicence fiberglass-steel composite rods nationallicence load reducers nationallicence polished rod nationallicence load-reducing effects nationallicence Cen Xueqi China University of Petroleum, Beijing, China aut Wu Xiaodong China University of Petroleum, Beijing, China aut Gao Sheng-en Research Institute of Petroleum Exploration & Development, PetroChina, Beijing, China aut Chemistry and Technology of Fuels and Oils Springer US; http://www.springer-ny.com 51/4(2015-09-01), 371-378 0009-3092 51:4<371 2015 51 10553 https://doi.org/10.1007/s10553-015-0614-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10553-015-0614-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cen Xueqi China University of Petroleum, Beijing, China aut NATIONALLICENCE 700 1- Wu Xiaodong China University of Petroleum, Beijing, China aut NATIONALLICENCE 700 1- Gao Sheng-en Research Institute of Petroleum Exploration & Development, PetroChina, Beijing, China aut NATIONALLICENCE 773 0- Chemistry and Technology of Fuels and Oils Springer US; http://www.springer-ny.com 51/4(2015-09-01), 371-378 0009-3092 51:4<371 2015 51 10553