International Journal of Oil, Gas and Coal Engineering
Volume 7, Issue 1, January 2019, Pages: 13-20
Received: Aug. 8, 2018;
Accepted: Sep. 20, 2018;
Published: Jan. 24, 2019
Views 748 Downloads 86
Zhongbao Wu, Research Institute of Petroleum Exploration & Development, Petro China, Beijing, China
Hydraulic fracturing has become an indispensable stimulation measure for low permeability reservoirs, but how to quantitatively establish the fracturing geological model of this kind of reservoir has been an important factor restricting the progress of numerical research on overall hydraulic fracturing reservoirs. Based on the basic hypothesis of hydraulic fracturing and considering the heterogeneity of fracturing parameters, the mathematical models of fracture conductivity, permeability and porosity are deduced by reservoir engineering method, and the corresponding software is compiled to calculate quantitatively the geological parameters at any point of a single artificial fracture and its geological model is established. This model is applied to Sai 309 well area of Suijing oilfield in Changqing. Firstly, according to the geologic and development characteristics of the oilfield, unstable well test analysis method is used to quantitatively analyze the fracture parameters of fractured wells by using the existing formation testing data of wells, and then the critical geological factors and hydraulic fracturing operation parameters are selected to establish artificial neural network. Based on the trained neural network to predict the half-length of artificial fractures and the fracture conductivity of other wells without formation testing data, the porosity and permeability geological model of the fractures in hydraulic fracturing reservoir is established by using the above mathematical model, which lay a foundation for numerical simulation of fracture- matrix coupling in this kind of reservoir.
Analytical Fracture Models for Overall Hydraulic Fracturing Reservoirs, International Journal of Oil, Gas and Coal Engineering.
Vol. 7, No. 1,
2019, pp. 13-20.
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/
) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Min Chunjia, Lu Shuangfang, Tang Mingming. et al. Hydro-fracturing parameter optimization and simulation of horizontal well in tight oil reservoir. Fault-Block Oil & Gas Field 22(6), 794-797(2015).
Zhang Wanmao, Zhang Junxiang, Zou Yuebang. et al. Fracture Parameter optimimization of network fracturing for horizontal well in wellblock Y151 35(7), 66-69(2016).
Zhang Rusheng, Li Kezhi, Huang Zhiwen. Horizontal well fracturing parameter optimization for the tight gas reservoir in Dingbei Block 39(2), 249-253(2017).
Zhu Guangpu, Yao Jun, Fan Dongyan, Zeng Hui. Pressure transient analysis fractured horizontal well in shale gas reservoir. Chinese Journal of Theoretical and Applied Mechanics 47(6), 945-953(2015).
Yan Jin, He Youwei, Shi Yunqing. et al. Well testing analysis of mul ti—fractu red horizontal well with unequal gas production of fractures in tight gas reservoir. Natural Gas Geoscience 28(6), 839-845(2017).
HEY, CHENGS, LIS, et al. A semianalytical methodology to diagnose the locations of underperforming hydraulic fractures through pressure-transient analysis in tight gas reservoir [R]. SPE 185166-PA, 2016.
Wu Zhongbao. The numerical simulation study of large-scale overall fracturing oil reservoir with low permeability. Petroleum Geology and Recovery Efficiency 213(6), 101-104(2006).
Li Yongming, Liao Yi, Zhao Jingzhou. et al. Wormhole dissolution pattern study in complicated carbonate rock based on two-scale continuum model and equivalent seepage theory. Natural Gas Geoscience 27(1), 121-127(2016).
Ma Yongxin, Lei Xiao, Zhang Qiaoliang, Meng Lingqiang. A new model for calculating effective permeability in low permeability reservoir:A cas study of low permeability marine sediments reservoir in the Pearl River Mouth Basin. Lithologic Reservoirs 28(1), 117-122(2016).
Ge Jiali. The modern mechanics of fluids flow in oil reservoir (Volume I), Petroleum Industry Press, Beijing, 25—55(2003).
H. Gu, J. Desroches, J. L. Elbel. Computer simulation of multilayer hydraulic factures, SPE64789.
Hannah R R, Harrington L J, Lance L C. Real time calculation of accurate bottomhole fracturing pressure from surface measurements with measured pressure as a base, SPE 12062.
Onco H, Samaniego F. Transient pressure analysis for fractured wells. Journal of petroleum Technology33 (9), l749-l766(1981).
LEE Sheng-tai, brockenbrough J R. A new approximate analytic solution for finite conductivity vertical fractures. Society of petroleum Engineers Formation Evaluation 18(2), 75-88(1986).
Guo Dali, Ji Lujun, Zhao Jinzhou, Liu Ciqun. 3D fracture propagation simulation and production prediction in coalbed. Applied Mathematics and Mechanics (in Chinese) 22(4), 337-344(2001).
Guo Dali, Liu Ciqun, Zhao Jinzhou. Dynamic production prediction and parameter identification for gas well with vertical fracture. Applied Mathematics and Mechanics (in Chinese) 23(6), 563-567(2002).
Guo Dali, Zeng Xiaohui, Zhao Jinzhou, Liu Ciqun. Model and mothod of well test analysis for wells with vertical fracture. Applied Mathematics and Mechanics (in Chinese) 26(5), 527—533(2005).
Yang Shenglai, Wei Junzhi. Oil reservoir physics, Petroleum Industry Press, Beijing, 153—157(2004).