Affiliation:
1. Key Lab of Industrial Fluid Energy Conservation and Pollution Control (Ministry of Education), Qingdao University of Technology, Qingdao 266520, China
2. Research Institute of Exploration & Development, PetroChina, Beijing 100083, China
3. College of Mechanical and Electronic Engineering, China University of Petroleum (East China), Qingdao 266580, China
4. SINOPEC DaLian Research Institute of Petroleum and Petrochemicals, Dalian 116045, China
Abstract
The effects of complex well conditions in shale oil wells on the swelling and tribological properties of high-acrylonitrile stator rubber used in screw pumps were investigated in this study. Tests were conducted considering the combined effects of immersion medium, temperature, and duration. The key parameters measured included mass change rate, volume change rate, hardness, elongation at break, tensile strength, surface micro-morphology of the rubber after thermal expansion and swelling, friction coefficient, and wear quantity. The results indicated that in the actual well fluids, the mass change rate of high-acrylonitrile rubber ranged from −1.08% to 1.29%, with a maximum volume change rate of 2.78%. In diesel oil, the greatest mass change rate of the rubber was 4.68%, and the volume change rate did not exceed ±1%, indicating superior swelling resistance. In both actual well fluids and diesel oil, the maximum decreases in hardness were 8.7% and 9.5%, respectively. Tensile strength and elongation at break decreased with increasing immersion temperature, with elongation at break in 80 °C diesel oil decreasing by over 50%, indicating a significant decline in the tensile properties of the rubber. The average friction coefficient of rubber specimens immersed in actual well fluids at three temperatures, as well as in diesel oil at 25 and 50 °C, decreased compared with the high-acrylonitrile rubber without thermal expansion and swelling. However, the average friction coefficient of rubber specimens immersed in diesel oil at 80 °C increased. The wear quantity of the rubber increased following immersion in both media. Additionally, the friction coefficient and wear quantity of the rubber increased with increasing immersion temperatures. The results of the study can offer valuable insights into assessing the durability of properties in high-acrylonitrile stator rubber under complex well conditions.
Funder
National Natural Science Foundation of China
Taishan Scholar Project of Shandong Province
Shandong Provincial Plan for Introduction and Cultivation of Young Pioneers in Colleges and Universities
Natural Science Foundation of Shandong Province
Project of CNOOC Research Institute Ltd.
Reference54 articles.
1. First application of progressing cavity pumps for appraisal well testing in the Ugandan Albertine Graben Basin;Sathyamoorthy;SPE Prod. Oper.,2013
2. Producing extra-heavy oil from the Orinoco Belt, Cerro Negro Area, Venezuela, using bottom-drive progressive cavity pumps;Ramos;SPE Prod. Oper.,2007
3. Optimization and characteristic analysis of screw rotor of a twin-screw pump;Tian;J. Vibroeng.,2022
4. Submersible direct-drive progressing cavity pump rodless lifting technology;Hao;Pet. Explor. Dev.,2019
5. Finite element analysis for adhesive failure of progressive cavity pump with stator of even thickness;Chen;J. Pet. Sci. Eng.,2014
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献