Experimental Study on Conductivity of Hydraulic Fracture in Coal Bed
Authors
-
China University of Petroleum, Beijing, State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102 249 ,CN
Dong Guang -
China University of Petroleum, Beijing, State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102 249 ,CNDeng Jingen
-
China University of Petroleum, Beijing, State Key Laboratory of Petroleum Resource and Prospecting, Beijing 102 249 ,CNZhu Haiyan
Keywords:
Coal Bed, Hydraulic Fracture, Proppant, Conductivity.Abstract
Hydraulic fracturing is an important stimulation technology of coal bed methane well. It is different between CBM reservoirs and conventional oil and gas reservoirs. The research conclusion of coal bed hydraulic fracture conductivity is different from that of conventional oil and gas reservoir. It is necessary to carry out the research of coal bed hydraulic fracture conductivity. In this paper, fracture conductivity of coal rock is evaluated by FCES-100 fracture conductometer. The effect of closure pressure, sand concentration, time, the natural fractures of coal rock as well as proppant type on fracture conductivity are studied. The study shows that as the closure pressure increases, there is a decline of more than 50% about coal bed fracture conductivity. The conductivity under high sand concentration is significantly higher than that under single layer sand concentration. Thereby, increasing the concentration of sand is conducive to the formation of high conductivity fracture. With the time increase, fracture conductivity is decreased with a decline of 20%~35%. Natural fracture has a direct impact on conductivity, and this impact is performed particularly evidently in the case of a higher closure pressure. Meanwhile proppant type is also an important factor in affecting the fracture conductivity.
Downloads
Metrics
Downloads
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
References
Laubach, S. E., Marrett, R. A., Olson, J. E. and Scott, A. R. (1998): “Characteristics and origins of coal cleat: A review.” International Journal of Coal Geology 1998; 35:175-207.
Su, Xianbo, Feng, Yanli, Chen, Jiangfeng and Pan, Jienan (2001): “The characteristics and origins of cleat in coal from Western North China.” International Journal of Coal Geology 2001; 47:51-62.
Wang, G. X., Wang, Z. T., Rudolph, V., Massarotto, P. and Finley, R. J. (2007): “An analytical model of the mechanical properties of bulk coal under confined stress.” Fuel 2007; 86:1873-1884.
Zhan, G. Shicheng, Mou, Shanbo, Zhan, G. Jin and Wan, G. Lei (2008): “Experimental Evaluation of Long-term Conductivity of Fracturing in Coal Beds.” Acta Geologica Sinica 2008; 82:1444-1449.
Awoleke, O., Romero, J., Zhu, D. and Hill, A. D. (2012): Experimental Investigation of Propped Fracture Conductivity in Tight Gas Reservoirs Using Factorial Design. SPE Hydraulic Fracturing Technology Conference, Woodlands, Texas, 2012, paper SPE 151963.
Marpaung, F., Chen, F., Pongthunya, P., Zhu, D. and Hill, A. D. (2008): Measurement of Gel Cleanup in a Propped Fracture With Dynamic Fracture Conductivity Experiments. SPE Annual Technical Conference and Exhibition, Denver, Colorado, 2008, paper SPE 115653.
Alramahi, B. and Sundberg, M. I. (2012): Proppant Embedment and Conductivity of Hydraulic Fractures in Shales. Mechanics/Geomechanics Symposium, Chicago, 2012.
Rivers, M., Zhu, D. and Hill, A. D. (2012): Proppant Fracture Conductivity with High Proppant Loading and High Closure Stress. SPE Hydraulic Fracturing Technology Conference, Woodlands, Texas, 2012, paper SPE 151972.
Cipolla, C. L., Lolon, E. P., Ceramics, Carbo, Mayerhofer, M. J. and Warpinski, N. R. (2009): The Effect of Proppant Distribution and Un-Propped Fracture Conductivity on Well Performance in Unconventional Gas Reservoirs. SPE Hydraulic Fracturing Technology Conference, Woodlands, Texas, 2009, paper SPE 119368.
Wen, Qingzhi, Zhang, Shicheng, Wang, Lei, Liu, Yongshan and Li, Xianping (2007): “The effect of proppant embedment upon the long-term conductivity of fractures.” Journal of Petroleum Science and Engineering, 2007; 55: 221-227.
