Well test analysis for multistage fractured horizontal wells in tight gas reservoir considering stress sensitivity

被引：0
|
作者：
Ouyang W. [1 ,2 ]
Sun H. [3 ]
Zhang M. [1 ,2 ]
机构：
[1] Changqing Downhole Technology Company, CNPC Chuanqing Drilling Engineering Company Limited, Xi'an, 710018, Shaanxi
[2] National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Fields, Xi'an, 710018, Shaanxi
[3] Department of Gas Field Development, PetroChina Research Institute of Petroleum Exploration and Development, Langfang, 065007, Hebei
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2018年 / 39卷 / 05期
关键词：
3D model; Finite element method; Irreversibility; Multistage fractured horizontal well; Numerical well test; Stress sensitivity; Well opening and closing times;
D O I：
10.7623/syxb201805008
中图分类号：
学科分类号：
摘要：
Based on the stress-sensitive experimental data and well test theory of tight gas reservoirs, this study establishes a three-dimensional numerical well test model for multistage fractured horizontal wells, in which the permeability varies with effective stress in a power law model. Well test log-log type curves under different stress-sensitive conditions are obtained using the finite element method with hybrid elements for model solution. The influences of stress sensitive irreversibility on the characteristics of well test curves are studied as well as the effects of other factors, such as stress sensitivity coefficient, opening and closing times and flow rate on the test curve morphology. The results show that the irreversibility of stress sensitivity can cause permanent damages to formation permeability. The greater the stress sensitivity coefficient is, the more the opening and closing times are, the larger the flow rate is, the more damages to formation permeability will occur. The well test log-log type curve is manifested as a rising pressure and pressure derivative curve, respectively. The full-history pressure curve shows a pressure drop amplitude upgraded with the increase of opening and closing times. For wells in tight reservoir after multiple closing and opening, the test data interpretation results indicate that if the influence of stress-sensitive irreversibility is neglected, the permeability of original formation is small, difficult to match the full-history pressure curve. © 2018, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：570 / 577
页数：7
相关论文
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