financially supported by the National Natural Science Foundation of China(Grant No.51174224);the National Science and Technology Major Projects of Oil and Gas(Grant Nos.2016ZX05066 and 2016ZX05042);the Natural Science Foundation of Shandong Province(Grant No.ZR2014El015)
A new technology of offshore oil rod pumping production is developed for offshore heavy oil recovery. A new type of miniature hydraulic pumping unit with long-stroke, low pumping speed and compact structure is designe...