空心抽油杆 meaning in English

hollow rod
hollow sucker rod

Specification for hollow sucker rod
空心抽油杆
Analytical solution for steam heating system of hollow sucker rod and optimal design of injection parameters
空心抽油杆注蒸汽数学模型的解析解及其参数优化
The new unit adopts hollow sucker rod working with pump and as fluid passage instead of conventional sucker rod , and uses a new hanger to fix the one - piece barrel rod pump on the casing wall , improving the operation stability of the subsurface pump
针对这种情况，大港油田新世纪机械制造有限公司研制成功一种新型无油管采油装置，这种装置以空心抽油杆代替实心抽油杆带泵工作并兼作出油流道，还通过一种新型悬挂器将整筒抽油泵固定在套管壁上，提高了抽油泵的工作稳定性。