ANALYTIC EVALUATION METHOD OF FRACTAL EFFECTIVE STIMULATED RESERVOIR VOLUME FOR FRACTURED WELLS IN UNCONVENTIONAL GAS RESERVOIRS

被引:5
|
作者
Zhang, Qi [1 ,2 ]
Su, Yuliang [2 ]
Zhao, Hui [3 ]
Wang, Wendong [2 ]
Zhang, Kaijie [2 ]
Lu, Mingjing [2 ,4 ]
机构
[1] China Univ Geosci, Fac Earth Resources, Wuhan 430074, Hubei, Peoples R China
[2] China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Shandong, Peoples R China
[3] Yangtze Univ, Coll Petr Engn, Wuhan 430100, Hubei, Peoples R China
[4] Colorado Sch Mines, Dept Civil & Environm Engn, Golden, CO 80401 USA
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Unconventional Gas Reservoirs; Gas Adsorption; Fractured Wells; Fractal Geometry; Stimulated Reservoir Volume; HORIZONTAL WELLS; MODEL; FLOW; ADSORPTION; IMBIBITION;
D O I
10.1142/S0218348X18500974
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
It has been proved that effective stimulated reservoir volume (ESRV) is a significant area dominant to the production of the fractured well in unconventional gas reservoirs. Although ESRV properties can be estimated based on the microseismic technology and the analysis of actual fracturing data, the operations are complicated and results are inaccurate. Due to the complex structure of stimulated reservoir volume (SRV) with fractal and chaotic characteristics, a fractal evaluation model for ESRV (ESRV-FEM) of fractured wells in unconventional gas (both tight and shale gas) reservoirs is developed. Multiple gas transport mechanisms, SRV and unstimulated reservoir volume (USRV) are included. According to the pressure transient analysis (PTA), influences of multiple transport mechanisms on gas transport behaviors in ESRV are conducted. Moreover, the fractal index representing the heterogeneity degree is applied to estimate the ESRV under different inter-porosity flow coefficients and storage ratio conditions based on the ESRV-FEM. In addition, the presented ESRV-FEM is validated by an actual field case. The results show that gas adsorption has a significant effect on the radial flow duration time in SRV, and the heterogeneity makes the radial flow on PTA curves no longer show a horizontal line with the value of 0.5. Calculated ESRV sizes are compared with the assumed ones under different fractal indexes. The stronger the heterogeneity, the smaller ESRV is. The ESRV size of a fractured well in shale gas reservoirs is only 52.11% of SRV size when the fractal index equals to 0.6. The ESRV-FEM presented in this paper is expected to provide an effective method for the evaluation of the ESRV of fractured wells in unconventional gas reservoirs.
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页数:13
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