Petroleum Exploration and Development >
Features of fracture height propagation in cross-layer fracturing of shale oil reservoirs
Received date: 2020-06-17
Revised date: 2021-02-17
Online published: 2021-04-22
Supported by
National Natural Science Foundation of China(51874328);National Natural Science Foundation of China(52074311);National Natural Science Foundation of China(U1762215);National Natural Science Foundation of China(U19B6003-05);China National Petroleum Corporation-China University of Petroleum (Beijing) Strategic Cooperation Science and Technology Project(ZLZX2020-02)
Triaxial fracturing modeling experiments were carried out on whole diameter shale cores from different layers of Shahejie Formation in the Dongpu sag, Bohai Bay Basin to find out the vertical propagation shapes of hydraulic fractures in different reservoirs. A numerical simulation method of inserting global cohesive elements was adopted to build a pseudo-three-dimension fracture propagation model for multiple shale oil reservoirs considering interface strength, perforation location, and pump rate to research the features of hydraulic fracture (HF) penetrating through layers. The hydraulic fracture propagates in a cross pattern in tight sandstone layers, in a straight line in sandstone layers with natural fractures, forms ladder fracture in shale layers with beddings. The hydraulic fracture propagates in a stripe shape vertically in both sandstone and shale layers, but it spreads in the plane in shale layers after connecting beddings. Restricted by beddings, the hydraulic fractures in shale layers are smaller in height than those in sandstone layers. When a sandstone layer and a shale layer are fractured at the same time, the fracture extends the most in height after the two layers are connected. Perforating at positions where the sandstone-shale interface is higher in strength and increasing the pumping rate can enhance the fracture height, thus achieving the goal of increasing the production by cross-layer fracturing in multiple shale oil layers.
Yizhao WANG , Bing HOU , Dong WANG , Zhenhua JIA . Features of fracture height propagation in cross-layer fracturing of shale oil reservoirs[J]. Petroleum Exploration and Development, 2021 , 48(2) : 469 -479 . DOI: 10.1016/S1876-3804(21)60038-1
| [1] | ZHAO Xianzheng, ZHOU Lihong, PU Xiugang, et al. Geological characteristics of shale rock system and shale oil exploration breakthrough in a lacustrine basin: A case study from the Paleogene 1st sub-member of Kong 2 Member in Cangdong sag, Bohai Bay Basin, China. Petroleum Exploration and Development, 2018,45(3):361-372. |
| [2] | GUO Jianchun, TAO Liang, ZENG Fanhui. Optimization of refracturing timing for horizontal wells in tight oil reservoirs: A case study of Cretaceous Qingshankou Formation, Songliao Basin, NE China. Petroleum Exploration and Development, 2019,46(1):146-154. |
| [3] | HOU B, CHEN M, CHENG W, et al. Investigation of hydraulic fracture networks in shale gas reservoirs with random fractures. Arabian Journal for Science and Engineering, 2016,41(7):2681-2691. |
| [4] | RENSHAW C, POLLARD D. An experimentally verified criterion for propagation across unbounded frictional interfaces in brittle, linear elastic materials. International Journal of Rock Mechanics and Mining Sciences & Geomechanics, 1995,32(3):237-249. |
| [5] | WARPINSKI N, TEUFEL L. Influence of geologic discontinuities on hydraulic fracture propagation (includes associated papers 17011 and 17074). SPE 13224, 1987. |
| [6] | HOU Bing, CHEN Mian, CHENG Wan, et al. Fracturing mechanism of shale gas reservoir with variable pump rates. Chinese Journal of Geotechnical Engineering, 2014,36(11):2149-2152. |
| [7] | LI Yongming, XU Wenjun, ZHAO Jinzhou, et al. Criteria for judging whether hydraulic fractures cross natural fractures in shale reservoirs. Natural Gas Industry, 2015,35(7):49-54. |
| [8] | CHENG Wan, JIN Yan, CHEN Mian, et al. Experimental investigation on influence of discontinuities on hydraulic fracture propagation in three-dimensional space. Chinese Journal of Geotechnical Engineering, 2015,37(3):559-563. |
| [9] | KAO Jiawei, JIN Yan, FU Weineng, et al. Experimental research on the morphology of hydraulic fractures in deep shale under high difference of in-situ horizontal stresses. Chinese Journal of Rock Mechanics and Engineering, 2018,37(6):1332-1339. |
| [10] | LIN Botao, SHI Can, ZHUANG Li, et al. Study on fracture propagation behavior in ultra-heavy oil reservoirs based on true triaxial experiments. Petroleum Exploration and Development, 2020,47(3):608-616 |
| [11] | LIU Zhiyuan, CHEN Mian, JIN Yan, et al. The effect of argillaceous interlayers on integrative fracturing of sandstone-mudstone interbedding reservoir with huge thickness. Science Technology and Engineering, 2014,14(9):34-38. |
| [12] | ZHANG Anshun, YANG Zhengming, LI Xiaoshan, et al. An evaluation method of volume fracturing effects for vertical wells in low permeability reservoirs. Petroleum Exploration and Development, 2020,47(2):409-415. |
| [13] | HOU Bing, CHENG Wan, CHEN Mian, et al. Experiments on the non planar extension of hydraulic fractures in fractured shale gas reservoirs. Natural Gas Industry, 2014,34(12):81-86. |
| [14] | HOU Bing, TAN Peng, CHEN Mian, et al. Experimental investigation on propagation geometry of hydraulic fracture in compact limestone reservoirs. Chinese Journal of Geotechnical Engineering, 2016,38(2):219-225. |
| [15] | LEI Qun, WENG Dingwei, GUAN Baoshan, et al. A novel approach of stimulation based on fracture controlling optimization and design. Petroleum Exploration and Development, 2020,47(3):592-599. |
| [16] | YUAN L, HOU B, LI W, et al. Experimental investigation on fracture geometry in multi-stage fracturing under tri-axial stresses: 8th Asian Rock Mechanics Symposium. Sapporo, Japan: International Society for Rock Mechanics and Rock Engineering, 2014. |
| [17] | HOU B, CHANG Z, FU W, et al. Fracture initiation and propagation in a deep shale gas reservoir subject to an alternating-fluid-injection hydraulic-fracturing treatment. SPE Journal, 2019,24(4):1-17. |
| [18] | WANG Junlei, JIA Ailin, WEI Yunsheng, et al. Optimization workflow for stimulation-well spacing design in a multiwell pad. Petroleum Exploration and Development, 2019,46(5):981-992. |
| [19] | XU Dan, HU Ruilin, GAO Wei, et al. Effects of laminated structure on hydraulic fracture propagation in shale. Petroleum Exploration and Development, 2015,42(4):523-528. |
| [20] | WANG Yonghui, LIU Yuzhang, DING Yunhong, et al. Study on the mechanism of shale bedding on the vertical propagation of fracturing fractures. Drilling & Production Technology, 2017,40(5):39-42. |
| [21] | BAJESTANI B M, OSOULI A. Effect of hydraulic fracture and natural fractures interaction in fracture propagation: 13th ISRM International Congress of Rock Mechanics. Montreal, Canada: International Society for Rock Mechanics and Rock Engineering, 2015. |
| [22] | KOLAWOLE O, ISPAS I. Interaction between hydraulic fractures and natural fractures: Current status and prospective directions. Journal of Petroleum Exploration and Production Technology, 2020,10:1613-1634. |
| [23] | CAMPBELL W, WICKER J, COURTIER J. Natural and hydraulic fracture density prediction and identification of controllers. Texas, USA: Unconventional Resources Technology Conference, 2018. |
| [24] | HOU B, CHENG W, JIN Y, et al. Experimental investigation on fracture geometry in multi-stage fracturing under tri-axial stresses: ISRM International Symposium-8th Asian Rock Mechanics Symposium. Sapporo, Japan: International Society for Rock Mechanics and Rock Engineering, 2014. |
| [25] | KRESSE O, WENG X. Effect of shear slippage of vertically crossed layer interface on hydraulic fracture height growth: 53rd US Rock Mechanics/Geomechanics Symposium. New York City, USA: American Rock Mechanics Association, 2019. |
| [26] | MA X, ZHOU T, ZOU Y. Experimental and numerical study of hydraulic fracture geometry in shale formations with complex geologic conditions. Journal of Structural Geology, 2017,98:53-66. |
| [27] | WENG X, CHUPRAKOV D, KRESSE O, et al. Hydraulic fracture-height containment by permeable weak bedding interfaces. Geophysics: Journal of the Society of Exploration Geophysicists, 2018,83(3):137-152. |
| [28] | XIE J, TANG J, YONG R, et al. A 3-D hydraulic fracture propagation model applied for shale gas reservoirs with multiple bedding planes. Engineering Fracture Mechanics, 2020,228:106872. |
| [29] | ZHANG F, NAGEL N, LEE B, et al. The influence of fracture network connectivity on hydraulic fracture effectiveness and microseismicity generation: 47th U.S. Rock Mechanics/Geomechanics Symposium. San Francisco, USA: American Rock Mechanics Association, 2013. |
| [30] | ZHANG F, MACK M. Integrating fully coupled geomechanical modeling with microsesmicity for the analysis of refracturing treatment. Journal of Natural Gas Science and Engineering, 2017,46:16-25. |
| [31] | WANG Yong, WANG Xuejun, SONG Guoqi, et al. Genetic connection between mud shale lithofacies and shale oil enrichment in Jiyang Depression, Bohai Bay Basin. Petroleum Exploration and Development, 2016,43(5):696-704. |
| [32] | SONG Mingshui, LIU Huimin, WANG Yong, et al. Enrichment rules and exploration practices of Paleogene shale oil in Jiyang Depression, Bohai Bay Basin, China. Petroleum Exploration and Development, 2020,47(2):225-235. |
| [33] | HUANG Aihua, XUE Haitao, WANG Min, et al. Reservoir potential evaluation of Es3L shale oil in Dongpu Depression . Journal of Yangtze University (Natural Science Edition), 2017,14(3):1-6. |
| [34] | YANG Zhi, HOU Lianhua, TAO Shizhen, et al. Formation conditions and “sweet spot” evaluation of tight oil and shale oil. Petroleum Exploration and Development, 2015,42(5):555-565. |
| [35] | HAN W, CUI Z, ZHANG J. Fracture path interaction of two adjacent perforations subjected to different injection rate increments. Computers and Geotechnics, 2020,122:103500. |
| [36] | MUTALIK P N, GIBSON R W. Case history of sequential and simultaneous fracturing of the Barnett shale in Parker County. SPE 116124, 2008. |
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