Abstract
There are various types of reservoirs in Dagang oilfield, in which the geological reserves of heavy oil reservoirs account for 43.1% of the total geological reserves developed. In Liuguanzhuang, Kongdian and other heavy oil blocks, the average viscosity of crude oil is 8537 mPa•s. The downstream is difficult and the efficiency of the pumping pump is still low. Therefore, the hollow rod electric heating technology has been applied to the pumping system, which results in a great increase of energy consumption. The average monthly power consumption of a single well is 37,500 kW•h, and the annual power consumption is 358,000 yuan. This brings a great challenge to energy conservation, environmental protection, cost reduction and efficiency increase. Therefore, the electric submersible progressing cavity pump has been tested and applied. Oil recovery technology has achieved remarkable results of energy saving and consumption reducing and prolonging production cycle. The technical problems existing in the application of electric submersible progressing cavity pump have been solved by studying and establishing the calculation model of pipe flow friction and optimizing the matching equipment of the unit. The normal production of high viscosity and high deviation wells has been realized and the conventional pumping units have been replaced. The electric heating process with rod pumps can greatly reduce the energy consumption of the system operation, and provides a new technical way for the large-scale benefit utilization of heavy oil blocks and the matching of technology and technology for oil wells with complex well conditions.
There are many types of reservoirs in Dagang Oilfield. Among them, the geological reserves of heavy oil reservoirs account for 43.1% [1] of the total developed geological reserves, and the heavy oil blocks such as Liuguanzhuang and Kongdian. Due to the high viscosity of oil wells, the average crude oil viscosity is 8537mPa. s, at present, the pumping unit is mainly equipped with a hollow rod electric heating process, but the sucking rod column is difficult to descend, and the pumping pump efficiency is still low. Therefore, the hollow rod electric heating process is applied [2]. The energy consumption of operation is greatly increased. The average monthly power consumption of a single well is 37,500 kW•h, and the annual electricity consumption cost is 358,000 yuan. This brings huge challenges to energy conservation, environmental protection, cost reduction and efficiency enhancement. The large angle of the well is intensifying the problem of eccentric wear of the rod and tube, and the pumping period of the oil well is less than one year. How to improve the development efficiency of oil wells in thick and inclined wells, reduce operating energy consumption, and extend the period of oil well inspection pumps has become an important topic to solve the benefit development of heavy oil blocks.
Since 2017, the Dagang Oilfield research support and test has applied the electric submersible progressing cavity pump oil production technology. This technology uses low-speed high-torque permanent magnet synchronous submersible motor to drive high-performance screw pump production, which can reduce the monthly power consumption of a single well to 2,520. kW•h, the unit can adapt to the 90° position of the inclined angle of the well, and the viscosity of the well fluid can reach 25400 mPa•s. The adaptability to the high-slope well of the heavy oil is greatly improved. At the same time, the tube flow through the test application process. The frictional resistance calculation model and the optimization of the supporting equipment of the unit have solved the technical problems existing in the application process of the electric submersible progressing cavity pump, and realized the normal production of the high-viscosity oil high-angle well, and replaced the conventional pumping unit with a rod pump. The electric heating process greatly reduces the energy consumption of the system, and the power saving rate reaches 96%. In this type of oil well, 45 wells have been promoted and applied, and good implementation results have been achieved, which is the scale efficiency of the heavy oil block and The technical technology of complex well conditions oil wells provides a new technical approach.
