Project Title:Efficient extraction technology with rodless lifting for horizontal well of shale oil platform

Participating Enterprises: Shale Oil Development Branch of Petrochina Changqing Oilfield Company ; Oil & Gas Technology Research Institute of Petrochina Changqing Oilfield Company

Award Received: Technological Innovation Award

Achievement Level: International Advanced Level

Project Number: ECF-2025-SET-1011

Main Participants: Huang Zhanwei, Ma Hongxing, Dang Yongchao, Wang Xiaorui, Liu Huanyu, Fan Song, Yue Yuanzhou, Hu Sujuan, Tian Weidong, Zhang Lei, Wang Yihang, Zhang Xin, Liu Zhiyong, Chai Xiaoyong, Zhong Jianwei

Expert Review Comments:
International advanced level. This project addresses challenges in shale oil large-platform long horizontal wells during lifting and production operations, such as rod-end wear, complex wellbore conditions, and fluctuating fluid volumes. It innovatively establishes a “two-stage rodless lifting + dynamic balanced production” technology system, developing an electric submersible screw pump system and a “five-in-one” integrated wellbore prevention and control process to achieve efficient, safe, intelligent, and green production operations. Through automated production parameter collection and online operational diagnostics, it seamlessly integrates intelligent pressure equalization with photovoltaic power supply modes, establishing a smart rodless pumping technology system suitable for platform-based shale oil development. The technology has been applied to over 100 wells in Changqing Oilfield and other locations, significantly enhancing recovery rates and operational stability. It delivers outstanding economic and social benefits with broad prospects for industrial-scale deployment.

Main Innovations:

1）Innovation has formed a two-stage lifting process of "centrifugal pump discharge+screw pump production"，achieving efficient drainage and production of large platform horizontal wells. 

2）Established a "five in one" comprehensive wellbore prevention and control process system, which solves prominent contradictions such as wax deposition, sand production, gas lock, and blowout prevention in shale oil horizontal wells. 

3) Innovative formation of large platform dynamic balance oil recovery technology for automatic collection of production parameters，combining photovoltaic system power supply to achieve efficient and green oil recovery

Main Uses and Technical Principles:

In response to the complex investigation requirements of long horizontal wells on shale oil platforms, the application of rodless lifting technology, innovative drainage processes, integrated process matching, and research and development of dynamic balance oil recovery technology have achieved the intelligent, large-scale, and cost-effective application of rodless lifting technology for shale oil platform horizontal wells, meeting the technical needs of efficient investigation of shale oil horizontal wells and solving several major challenges faced by conventional machine extraction processes for large platform horizontal wells. Firstly, the complex wellbore trajectory, large offset distance, and severe pipe and rod wear of large platform oil wells have been solved by the application of rodless oil recovery technology, which thoroughly solves the problem of pipe and rod wear; Secondly, there is a significant change in the amount of liquid produced during the fracturing process of shale oil horizontal wells. Conventional lifting requires multiple equipment replacements, resulting in increased investment and operational risks. The displacement of rodless pumps ranges from 5 to 80m3 , meeting the different liquid volume extraction needs throughout the entire life cycle and avoiding duplicate capital investment; The third issue is the coexistence of wax, gas, and sand in shale oil horizontal wells, which creates a complex environment and restricts the long-term, efficient, and stable operation of lifting equipment; The fourth is to automatically collect parameters and dynamically balance oil production to achieve balanced pressure relief on large platforms, effectively improving the final recovery rate. Through project research and development, an intelligent rodless extraction process system suitable for horizontal wells on shale oil platforms has been formed, which promotes the efficient development of shale oil in Changqing Oilfield.

Technical Applications:

Changqing Oilfield Shale Oil Development Branch deployed rodless pumping equipment in 138 wells from 2022 to 2025. Through nearly three years of exploration, it has essentially established rodless lifting technologies suitable for horizontal wells in the large-scale shale oil platforms of Changqing Oilfield. This has enabled the large-scale application of platforms such as Hua H40, Hua H50, Hua H60, Hu H100, and He H60 large-scale platforms. The system demonstrates distinct advantages in efficiency, intelligence, safety, and environmental sustainability. It pioneers new pathways for efficient lift in complex horizontal wells with intricate wellbore structures, accumulating valuable experience for enhancing efficiency, reducing frequency, advancing intelligent development, and facilitating low-carbon transformation in mechanical production systems. Concurrently, it established Hu H90-3 as Asia's longest rodless pumping well and Hu H100 as Asia's largest onshore rodless pumping demonstration platform. As unconventional shale oil and gas development advances, the “large platform, multi-formation, three-dimensional” long horizontal well development model has become a key technology for effective reservoir utilization. New development concepts and requirements—such as enhancing efficiency, conserving land, and promoting environmental sustainability—will significantly drive the adoption of large-platform rodless lifting and production technologies, offering broad application prospects.