Extended Search

- in all fields
- in the title
- in key words
- in the abstract
- in the bibliography
Analysis of factors affecting productivity of fractured horizontal well in tight gas formations (a case study of reservoirs in Western Sichuan, China)

Authors: Anlun WANG is a PhD candidate of Gubkin Russian State University of Oil and Gas (National Research University). E-mail: law8912@163.com
Vladimir S. YAKUSHEV is Doctor of Geology and Mineralogy, professor of the Department of Gas and Gas-Condensate Reservoir Engineering of Gubkin Russian State University of Oil and Gas (National Research University), member of the Academy of Natural Sciences (Section of Oil and Gas). His professional interests are prospecting, exploration, exploitation, procession and storage of natural gas. E-mail: law8912@163.com

Abstract: An analytical model was used to analyze the affect of factors on the productivity of fractured horizontal gas well in formations with permeability of about 0,1 mD. The following factors were considered: fracture width, fracture half-length, the number of fractures and fracture permeability. It was shown that unlike conventional low-permeability reservoirs, fracture permeability in tight formations has limited effect on the well productivity, whereas fracture half-length and the number of fractures are the main affect factors. It is noted that increasing fracture width thousands of times has no effect on the well productivity, and therefore, mesh simplification for numerical simulation of fractured horizontal wells in such formations was proved feasible

Index UDK: 662.279.3

Keywords: tight formation, fractured horizontal well, factors, affecting well pro-ductivity

1. Jun Ye, Tong Zhu, Zejiang Zhao. A study of gas reservoirs of upper shaximiao formation (J2s) and its origin in xinchang gas field, west Sichuan//Experimental petroleum geology, 1998, 12.
2. Lee S.-T. and Brockenbrough, J.R. A new approximate analytic solution for finite-conductivity vertical fractures, 1986. SPE Form Eval 1 (1): 75-88. http://dx.doi.org/10.2118/ 12013-PA.
3. Gringarten A.C. and Ramey, H.J., and Raghavan, R. 1974. Unsteady-State pressure distributions created by a well with a single infinite-conductivity vertical fracture. SPEJ 14(4): 347-360. SPE 4051-PA.
4. Bo Song, Michael J. Economides. Design of multiple transverse fracture horizontal wells in shale gas reservoirs. 2011 SPE 140555.
5. Yongren Sun, Shan Ren, Shize Wang, Qidong Xiong. Study on the key fracturing technology for tight gas reservoirs in the west of Sichuan. Drilling and production technology, 2008, vol. 31, no. 4, p. 68-70.
6. Zhijun Wu, Shunli He. Geologic characteristics of Xinchang tight gas reservoir and reasonable fracturing scale. Natural gas industry, 2004, vol. 24, no. 9, p. 93-96.
7. Huachang Li, Zhimin du, Yong Tang, Yong Wang. The calculation of the control reserve of single horizontal well in shaerduan formation of xinchang gas field. Drilling and production technology, 2012, vol. 35, no. 2, p. 51-53.
8. Xu Wang, Mingwen Tan, Xiaoyong Yan, Guangpeng Xu, Wenlong Deng, Song Feng. Evaluation of horizontal well performance in shaximiao formation JS21 of xinchang gas field. Drilling and production technology, 2012, vol. 35, no. 1, p. 45-48.
9. Stalgorova, E. and Mattar, L. Analytical model for unconventional multifractured composite systems. Paper SPE 162516 presented at the SPE Canadian unconventional resources conference, Calgary, Alberta, 30 October-1 November, 2013.
10. Brown, M., Ozkan, E., Raghavan, R. et al. 2009. Practical solutions for pressure transient responses of fractured horizontal wells in unconventional reservors. Paper SPE 125043 presented at the SPE annual technical conference and exhibition, New Orleans, Louisiana, 4-7 October. http:/dx.doi.org/10.2118/125043-MS.
11. Hanqiao Jiang, Jun Yao, Ruizhong Jiang. Theory and methods of reservoir engineering. 2-nd edition. M.: China university of petroleum press, 2006, p. 171.