A study of well test data interpretation model for waterbearing reservoirs with phase redistribution

International Symposium on Resource Exploration and Environmental Science

地球科学;生态环境科学

Zhang, Junxiang^1 ; Deng, Rui^2 ; Liang, Haipeng^2 ; Yang, Jing^2

Gas Field Exploitation Department of PetroChina Changqing Oilfield Company, Xi'an, Shanxi, China^1

School of Energy Resource, Chengdu University of Technology, Chengdu, Sichuan, China^2

关键词: Condensate waters;    Laplace transformations;    Partial penetration;    Phase redistribution;    Pressure derivatives;    Theoretical research;    Water- bearing gas reservoirs;    Well test interpretation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/64/1/012019/pdf
DOI  :  10.1088/1755-1315/64/1/012019

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

In China, plentiful marine reservoirs exist. Net pay thickness in individual gas reservoirs where partial penetration was performed can be hundreds of meters. Due to the influence of condensate water and formation, water phase separation phenomenon, where gas rose up and liquid moved down, and a morsel of water production emerged in some gas wells, which makes the build-up curves distorted and thus unable to be interpreted. On the basis of seepage theory and Laplace transformation, a seepage mathematical model and a well test interpretation model for gas wells with phase separation considered are developed to analyze the impact of such various elements as phase separation and partial penetration on the pressure and pressure derivative log-log plot. With practical data of well test in Xihu Sag, reliability analysis of the mathematical model mentioned above was demonstrated. Theoretical research results proposed in our study substantially improved the accuracy of well test interpretation for thick water-bearing gas reservoirs and laid a technical foundation of development of the similar oil & gas reservoirs.