Chengtai Gao, (deceased) professor, recipient of the Special Government Allowance of China, and Society of Petroleum Engineers (SPE) member, was born in 1937. He earned a BS degree in mechanics from Peking University in 1963. He had more than 40 years of industry experience in well testing, reservoir description, and production and reservoir engineering. He worked for Sichuan, Jianghan, and Changqing oil fields early in his career and specialized in reservoir engineering and application software development. He was a visiting scholar at the University of Houston and Rice University from 1981 to 1983, where he specialized in well test analysis for multilayered reservoirs with crossflow. He joined the Xi'an Petroleum University in Oct. 1993, where he specialized in gas reservoir engineering aspects of low-permeability gas reservoirs. He had published over 30 papers in peer-reviewed journals and SPE conferences.

Hedong Sun, SPE member and senior engineer, was born in 1973 and earned his PhD from Xi'an Jiaotong University in 2004. Since 2004, he has been a research engineer for the Research Institute of Petroleum Exploration and Development (RIPED)-Langfang Branch, which is the R&D center of the China National Petroleum Corporation (CNPC). Hedong has about 20 years of reservoir engineering experience with a focus on well test analysis and production analysis. He has been one of the academic leaders of reservoir engineering for the RIPED-Langfang Branch since 2008. In 2013, he was appointed as a technical expert of Well Testing Analysis and Productivity Evaluation in RIPED-Langfang Branch. He is the reviewer for five journals, including ACTA Petrolei Sinica and Well Testing. He has published over 40 papers in peer-reviewed journals and SPE conferences. He has published two books, “Modern Well Test Analysis and Deliverability Analysis of Complex Gas Reservoir (in Chinese),” published by Petroleum Industry Press in 2012, and “Advanced Production Decline Analysis and Application (in Chinese and English)” published by Elsevier in 2015.