In the light of the problems with heavy oil recovery, Model HLB hollow cilculation subsurface pump is developed by Dagang Oilfield Group New Century Machinery Manufacturing Co., Ltd.

• 针对稠油开采中稠油粘度高、摩擦阻力大、原油不进泵、抽油杯柱下行困难，以及油管结蜡等问题，大港油田新世纪机械制造有限公司研制出HLB型空心环流稠油抽油泵。