Research and application of key technologies of geology and engineering integration for shale oil development: a case study of Chang 7 member of the Triassic Yanchang Formation, Ordos Basin

doi:10.3969/j.issn.1672-7703.2022.01.015

Abstract

Abstract: The reservoir of Chang 7 member shale oil in Longdong area is mainly composed of interbedding layers of deep lacustrine shale and gravity-flow sandstone, which is characterized by strongly heterogeneous reservoir distribution vertically and laterally and thin single sand layer, with natural fractures developed. In view of the technical challenges in shale oil development, such as well location placement, high-efficiency well drilling and customized well stimulation, a complete set of geology and engineering integrated solution is proposed.Firstly, by applying the comprehensive geological study results, 3D fine geological and geomechanical modeling and reservoir simulation are performed, and then well location selection, well-factory platform design, well drilling and geosteering schemes optimization are implemented to ensure that the well trajectory is reasonable and applicable, reservoir penetration rate is improved while well drilling and completion time is reduced; The combined geomechanical model and reservoir simulation enable the rational fracturing design and operation; In the flowback and production stage, a pertinent scheme is designed by considering the geological, oil reservoir, geomechanical and well completion conditions for fracturing operation to achieve the maximized single well production as well as a long-term cumulative production of the well block.

CLC Number:

TE319

Wang Ruijie, Wang Yongkang, Ma Fujian, Chen Xufeng, Liang Xiaowei, Liu Yuan, Qi Yin, Ding Li, Chen Bo, Wang Lipeng, Chai Huiqiang, Pan Yuanwei, Liu Bo, Lu Qingzhi. Research and application of key technologies of geology and engineering integration for shale oil development: a case study of Chang 7 member of the Triassic Yanchang Formation, Ordos Basin[J]. China Petroleum Exploration, 2022, 27(1): 151-163.

References

[1] 付金华，喻建，徐黎明，等. 鄂尔多斯盆地致密油勘探开发新进展及规模富集可开发主控因素[J]. 中国石油勘探，2015,20(5):9-19.
Fu Jinhua, Yu Jian，Xu Liming, et al . New progress in exploration and development of tight oil in Ordos Basin and main controlling factors of large-scale enrichment and exploitable capacity[J]. China Petroleum Exploration, 2015, 20(5):9-19.
[2] 冯张斌，马福建，陈波，等. 鄂尔多斯盆地长7 致密油地质工程一体化解决方案: 针对科学布井和高效钻井[J]. 中国石油勘探，2020, 25(2):155-168.
Feng Zhangbin, Ma Fujian, Chen Bo, et al . A Geologyengineering integration solution for tight oil exploration of the Chang-7 member, Yanchang Formation in the Ordos Basinfocusing on scientific well spacing and efficient drilling[J]. China Petroleum Exploration, 2020,25(2):155-168.
[3] 付金华，牛小兵，淡卫东，等. 鄂尔多斯盆地中生界延长组长7 段页岩油地质特征及勘探开发进展[J]. 中国石油勘探，2019,24(5): 601-614.
Fu Jinhua, Niu Xiaobing, Dan Weidong, et al . The geological characteristics and the progress on exploration and development of shale oil in Chang7 member of Mesozoic Yanchang Formation, Ordos Basin[J]. China Petroleum Exploration, 2019, 24(5):601-614.
[4] 王汇智，赵卫卫，何浩男，等. 鄂尔多斯盆地陇东地区致密油储层特征研究：以鄂尔多斯盆地长7 段为例[J]. 非常规油气，2019,6(2): 46-55.
Wang Huizhi, Zhao Weiwei, He Haonan, et al . Characteristics of tight oil reserviors in Ordos Basin, a case study of C7 member in Longdong area[J]. Unconventional Oil ＆ Gas, 2019, 6(2):46-55.
[5] 邹才能，赵政璋，杨华，等．陆相湖盆深水砂质碎屑流成因机制与分布特征：以鄂尔多斯盆地为例[J]．沉积学报，2009,27(6):1065-1075.
Zou Caineng, Zhao Zhengzhang, Yang Hua, et al ．Genetic mechanism and distribution of sandy debris flows in terrestrial lacustrine basin[J]. Acta Sedimentologica Sinica, 2009,27(6): 1065-1075.
[6] 李相博，刘化清，张忠义，等. 深水块状砂岩碎屑流成因的直接证据: “泥包砾”结构：以鄂尔多斯盆地上三叠统延长组研究为例[J]. 沉积学报，2014,32(4):42-51.
Li Xiangbo, Liu Huaqing, Zhang Zhongyi, et al . “Argillaceous parcel”structure: a direct evidence of debris flow origin of deep-water massive sandstone of Yanchang Formation，Upper Triassic，the Ordos Basin[J]. Acta Sedimentologica Sinica，2014, 32(4):42-51.
[7] Shanmugam G, Lehtonen L Ｒ , Straume T, et al . Slump and debris flow dominated upper slope facies in the Cretaceous of the Norwegian and Northern North Seas (61°～ 67 °N): implications for sand distribution[J]. AAPG Bulletin, 1994,78(6):910-937.
[8] 李国欣，朱如凯. 中国石油非常规油气发展现状、挑战与关注问题[J]. 中国石油勘探，2020,25(2):1-13.
Li Guoxin, Zhu Rukai. Progress, challenges and key issues in the unconventional oil and gas development of CNPC[J]. China Petroleum Exploration, 2020,25(2):1-13.
[9] 付金华，李士祥，侯雨庭，等. 鄂尔多斯盆地延长组7 段Ⅱ类页岩油风险勘探突破及其意义[J]. 中国石油勘探，2020,25(1):78-92.
Fu Jinhua, Li Shixiang, Hou Yuting, et al . Breakthrough of risk exploration for Class Ⅱ shale oil in Chang 7 member of the Yanchang Formation and its significance in the Ordos Basin[J]. China Petroleum Exploration, 2020,25(1):78-92.
[10] 马润勇，朱浩平，张道法，等. 鄂尔多斯盆地基底断裂及其现代活动性[J]. 地球科学与环境学报，2009,31(4):400-408.
Ma Runyong, Zhu Haoping, Zhang Daofa, et al , Basement faults and their recent activity in Ordos Basin[J]. Journal of Earth Sciences and Environment, 2009,31(4):400-408.
[11] 赵文智，胡素云，汪泽成，等. 鄂尔多斯盆地基底断裂在上三叠统延长组石油聚集中的控制作用[J]. 石油勘探与开发，2003,30(5):13-17.
Zhao Wenzhi, Hu Suyun, Wang Zecheng, et al . The control of basement faults on Yanchang Formation hydrocarbon accumulations in Ordos Basin[J]. Petroleum Exploration and Production, 2003,30(5):13-17.
[12] 赵振宇，郭彦如，王艳，等. 鄂尔多斯盆地构造演化及古地理特征研究进展[J]. 特种油气藏，2012,19(5):15-20.
Zhen Zhenyu, Guo Yanru, Wang Yan, et al . The study on structural evolution and paleo-geography in Ordos Basin[J]. Special Oil ＆ Gas Reserviors, 2012,19(5):15-20.
[13] 邸领军，张东阳，王宏科. 鄂尔多斯盆地喜山期构造运动与油气成藏[J]. 石油学报，2003,24,(2):34-37.
Di Lingjun, Zhang Dongyang, Wang Hongke. Himalayan tectonic movement and petroleum reservoir in Ordos Basin[J]. Acta Petrolei Sinica, 2003,24(2):34-37.
[14] Cheung P S Y, Heliot D. Workstation based fracture evaluation using borehole images and wireline logs[C]. SPE 65th Annual Technical Conference and Exhibition, Society of Petroleum Engineers, New Orleans, LA, 1990:465-474.
[15] Richard Y S, David T. Fracture pattern and associated aperture distubution: example from the foothills, western Canada[C]， SPWLA 46th Annual Logging Symposium, 2005.
[16] Xie J, Qiu K B, Zhong B, et al . Construction of a 3D geomechanical model for development of a shale gas reservoir in the Sichuan Basin[J]. SPE Drilling & Completion, 2018,33: 275-297.
[17] Byerlee J D. Friction of rocks [J]. Pure and Applied Geophysics, 1978,116:615-626.
[18] Zoback M D. Reservoir geomechanics[M]. Cambridge: Cambridge University Press, 2010:125-126.
[19] Barton C A, Zoback M D, Moos D. Fluid flow along potentially active faults in crystalline rock[J]. Geology, 1995, 23:683-686.
[20] Baihly J D, Malpani R, Edwards C, et al . Unlocking the shale mystery: how lateral measurements and well placement impact completions and resultant production[C]. SPE Annual Technical Conference and Exhibition.Society of Petroleum Engineers, 2010.
[21] Weng X, Kresse O, Cohen C, et al . Modeling of hydraulicfracture- network propagation in a naturally fractured formation[J]. SPE Production & Operations, 2011,26(4),368- 380.
[22] Longoria R A, Liang T, Huynh U T, et al . Water blocks in tight formations: the role of matrix/fracture interaction in hydrocarbon-permeability reduction and its implications in the use of enhanced oil recovery techniques[J]. SPE Journal, 2017, 22(5):1393-1401.
[23] Wijaya N, Sheng J J. Shut-in effect in removing water blockage in shale-oil reservoirs with stress-dependent permeability considered[J]. SPE Reservoir Evaluation & Engineering, 2020,23(1):81-94.
[24] Potapenko D I, Williams R D, Desroches J, et al . Securing long-term well productivity of horizontal wells through optimization of post fracturing operations[C]. SPE Annual Technical Conference and Exhibition, 2017.
[25] Deen T, Daal J, Tucker J. Maximizing well deliverability in the Eagle Ford shale through flowback operations[C]. SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers,2015.
[26] Rodriguez A, Maldonado F. Evaluating pressure drawdown strategy for hydraulically fracture shale gas condensate producers[C]. SPE Oklahoma City Oil and Gas Symposium. Society of Petroleum Engineers, 2019.