Field Monitoring and Identification Method for Overflow of Fractured-Vuggy Carbonate Reservoir
Author:
Zhang Qiangui12ORCID, Yan Zelin1, Fan Xiangyu123, Li Zhilin4, Zhao Pengfei3, Shuai Juntian5, Jia Lichun4, Liu Lu6
Affiliation:
1. Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China 3. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China 4. Drilling and Production Engineering Technology Research Institute, Chuanqing Drilling Engineering Co., Ltd., China National Petroleum Corporation, Guanghan 618300, China 5. China Resources Gas (Suining) Co., Ltd., China Resources, Suining 629000, China 6. First Oil Plant of Qinghai Oilfield, China National Petroleum Corporation, Dunhuang 736202, China
Abstract
Since carbonate reservoirs develop pores and fractures and have a complex formation pressure system, overflow and even blowout seriously threaten the exploration and development of these kinds of reservoirs. According to the overflow characteristics of fractured-vuggy carbonate reservoirs, a field monitoring and identification method for overflow has been developed. This method is based on the top-down logic framework for early overflow identification, combined with optimized monitoring parameters. The DBSCAN clustering algorithm is used to identify abnormal logging parameters, and thus, a probability weight coefficient of overflow (K) indicated by the abnormal engineering parameters of a gas well can be calculated. K is divided into four early warning response levels of overflow, and the overflow control operation can be made according to the different levels of early warning response. Based on this method, an integrated software system for field monitoring and identification of early overflow is designed. This software system integrates the functions of data collection and management, overflow risk parameter calculation, overflow early warning, and overflow simulation analysis. Finally, according to a case analysis of overflow prediction for a fractured-vuggy carbonate reservoir in Well XX, this method’s prediction stability and accuracy are demonstrated, indicating that it can be used for the overflow early warning in engineering practice.
Funder
National Natural Science Foundation of China Natural Science Foundation of Sichuan Province
Subject
Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction
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