Application of screw pump matched coaxial double hollow sucker rod in heavy oil recovery

In order to solve the problem of heavy oil exploitation which oil viscosity greater than 10 000 mPa·s under the condition of 50 degree ground, according to the theory of heavy oil development, a coaxial double hollow sucker rod model with viscosity reduction by circulating hot water and heat exchange was proposed for Well Ze70-9X1. And the model was established based on the analysis of viscosity-temperature characteristics and rheological properties for 5 heavy oil wells like Well Ze70-9X1. Following that, the temperature distribution of circulating hot water and oil in the lifting process were analyzed, and the crude oil viscosity changes along the way were also studied in detail. Making the circulating water inlet temperature control in a certain range can meet the need of five heavy oil wells normal production in the field production practice. The success provides technical reference for heavy oil recovery of similar reservoirs in structure edge.