Application of 3D geosteering in geology-engineering integration practice

doi:10.3969/j.issn.1672-7703.2017.01.011

Abstract

Abstract: Geology-engineering integration has become an indispensable exploration and development strategy along with the growing demand for production enhancement, cost control and efficiency improvement of horizontal wells in unconventional oil and gas reservoirs. Unconventional horizontal wells are faced with multiple challenges in terms of geology and engineering. In order to realize productivity breakthrough and beneficial development and meet the requirements of cost reduction and productivity construction ahead of schedule, it is common to apply horizontal wells in unconventional oil and gas reservoirs for early development. The geological uncertainties impact the drilling ratio of horizontal wells, increase operation risks and decrease drilling time efficiency. According to the concept of factorylike intensive well pattern, 3D extended reach well with complex trajectory is inevitable, making drilling operation more and more difficult. Practical operation indicates that trajectory optimization of horizontal well based on efficient geosteering method is the only way to diminish drilling risks, guarantee effective completion stimulation and realize beneficial development while ensuring the drilling ratio of sweet spots. 3D geosteering is a new-generation steering method which is developed according to the concept of geology-engineering integration, and its core lies in geosteering model reconstruction and high-precision 3D geological modeling. It maximizes the advantages of “well factory” and improves the model precision by means of horizontal wells, so as to provide the support for pre-drilling trajectory optimization, drilled formation anticipation and trajectory pre-adjustment. 3D geosteering is a process independent of LWD (logging while drilling) tool. With this technique, the drilling cost is reduced significantly, and satisfactory results are achieved in the practical drilling of shale gas or tight oil horizontal wells in China.

Key words: 3D geosteering, geology-engineering integration, unconventional horizontal well, drilling quality, shale gas, tight oil

CLC Number:

TE348

Wu Zongguo, Liang Xing, Dong Jianyi, Li Zhaofeng, Zhang Zhao, Wang Gaocheng, Gao Yang, Li Xun. Application of 3D geosteering in geology-engineering integration practice[J]. China Petroleum Exploration, 2017, 22(1): 89-98.

References

[1] 陈志鹏，梁兴，王高成，等.旋转地质导向技术在水平井中的应用及体会——以昭通页岩气示范区为例[J].天然气工业，2015,35(12):64-70. Chen Zhipeng, Liang Xing, Wang Gaocheng, et al. Application of rotary geosteering technology in horizontal wells and its implication: a case staudy of the Zhaotong shale gas demonstration area of Yunnan[J]. Natural Gas Industry, 2015, 35(12):64-70.
[2] 牛新明.涪陵页岩气田钻井技术难点及对策[J].石油钻探技术，2014,42(4):1-6. Niu Xinming. Drilling technology challenges and resolutions in Fuling Shale Gas field[J]. Petroleum Drilling Techniques， 2014,42(4):1-6.
[3] 文乾彬，杨虎，孙纬国，等. 吉木萨尔凹陷致密油大井丛“工厂化”水平井钻井技术[J].新疆石油地质，2015,36(3):334-337. Wen Qianbin, Yang Hu, Sun Weiguo, et al. Factory-like drilling technology of cluster horizontal wells for tight oil development in Jimusaer Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2015,36(3):334-337.
[4] 余雷，高清春，吴兴国，等. 四川盆地开发页岩气钻井技术难点与对策分析[J]. 钻采工艺，2014,37(2):5-7. Yu Lei, Gao Qingchun, Wu Xingguo, et al. Drilling technical difficulties and countermeasures in shale gas development in Sichuan Basin[J]. Drilling and Production Techniques， 2014,37(2):5-7.
[5] 崔思华，班凡生，袁光杰. 页岩气钻完井技术现状与难点分析[J]. 天然气工业，2011,31(4):72-75. Cui Sihua, Ban Fansheng, Yuan Guangjie. Analysis of status of challenges of shale gas drilling and completion[J]. Natural Gas Industry, 2011,31(4):72-75.
[6] 陈志明，廖新维，赵晓亮，等.低渗透致密气藏水平井探测半径研究[J].特种油气藏,2015,22(5):90-94. Chen Zhiming, Liao Xinwei, Zhao Xiaoliang,et al.Investigation radius of horizontal well in low-permeability tight gas reservoir [J].Special Oil & Gas Reservoirs, 2015,22(5)：90-94.
[7] 逄仁德, 崔莎莎, 尹宝福, 等. 鄂尔多斯盆地陆相页岩气缝网压裂技术应用分析[J]. 中国石油勘探, 2015, 20(6): 66-71. Pang Rende, Cui Shasha, Yin Baofu, et al. Network fracturing and its application to continental shale gas in Ordos Basin[J].China Petroleum Exploration, 2015,20(6):66-71.
[8] 王瑞.致密油藏水平井体积压裂效果影响因素分析[J].特种油气藏,2015,22(2):126-128. Wang Rui.Analysis on influential factors for volumetric fracturing effects in horizontal well in tight reservoir[J]. Special Oil & Gas Reservoirs, 2015,22(2):126-128.
[9] 郭旭升，胡东风，魏志红，等. 涪陵页岩气田的发现与勘探认识[J]. 中国石油勘探, 2016,21(3):24-37. Guo Xusheng, Hu Dongfeng, Wei Zhihong, et al. Discovery and exploration of Fuling shale gas field[J]. China Petroleum Exploration, 2016,21(3):24-37.
[10] 吴奇，梁兴，鲜成钢，等. 地质—工程一体化高效开发中国南方海相页岩气[J]. 中国石油勘探，2015,20(4):1-23. Wu Qi, Liang Xing, Xian Chenggang, et al. Geoscient-to-production integration ensures effective and efficient South China marine shale gas development[J]. China Petroleum Exploration. 2015,20(4):1-23.
[11] 陈颖杰，刘阳，徐婧源，等. 页岩气地质工程一体化导向钻井技术[J]. 石油钻探技术，2015，43(5):56-62. Chen Yingjie, Liu Yang, Xu Jingyuan, et al. Integrated steering drilling technology for geology engineering of shale gas[J]. Petroleum Drilling Techniques， 2015,43(5):56-62.
[12] 曾义金. 页岩气开发的地质与工程一体化技术[J]. 石油钻探技术，2014,42(1):1-6. Zeng Yijin. Integration technology of geology & engineering for shale gas development[J]. Petroleum Drilling Techniques，2014, 42(1):1-6.
[13] 吴奇，等. 地质导向与旋转导向技术应用及发展[M]. 北京：石油工业出版社，2012. Wu Qi, et al. Application and development of geosteering and RSS techniques[M]. Beijing:Petroleum Industry Press, 2012.
[14] Liang Xing, Wang Lizhi, Zhang Jiehui, et al. An integrated approach to ensure horizontal wells 100% in the right positions of the sweet section to achieve optimal stimulation: a shale gas field study in the Sichuan Basin, China[C]. SPE 177474, presented at the Abu Dhabi International Petroleum Exhibition and Conference held in Abu Dhabi, UAE, 9-12 Nov 2015.
[15] Faisal Bashir, Maan Al-Hawi, Indra Bhuana, et al. Real time 3D modeling to optimize geosteering in clastic reservoir-Case Study[C]. OTC 26635,Presented at the Offshore Technology Conference Asia held in Kuala Lumpur, Malaysia, 22-25 Mar 2016
[16] Najjar N F, Jerome T, Alshammery M. 3D geological modeling-while-drilling for geosteering[C]. IPTC 10850, Presented at International Petroleum Technology Conference held in Doha, Qatar, 21-23 Nov 2005.
[17] 常森，罗静兰，付晓燕，等. 苏里格气田水平井地质三维导向技术——以盒8段辫状河储层为例[J]. 吉林大学学报:地球科学版，2015, 45(6):1608-1619. Chang Sen, Luo Jinglan, Fu Xiaoyan, et al. Three-dimentional geosteering technology for horizontal wells in Sulige gasfield-a case study from braided river reservoir of the He8 Group[J]. Journal of Jilin University: Earth Science Edition, 2015,45(6):1608-1619.
[18] 吴胜和，翟瑞，李宇鹏. 地下储层构型表征：现状与展望[J]. 地学前缘, 2012, 19(2):15-23. Wu Shenghe, Zhai Rui, Li Yupeng. Subsurface reservoir architecture characterization: current status and prospects[J]. Earth Science Frontiers, 2012 19(2):15-23.
[19] Charles R Berg, Andrew C Newson. Geosteering using true stratigraphic thickness[C]. SPE 68866,Presented at the Unconventional Resources Technology Conference, Denver, Colorado, USA, 12-14 Aug 2013.
[20] Gao Wenkai, Sheng Limin, Dou Xiurong, et al. CGDS near-bit geosteering drilling system and its application in China[C]. SPE 176495, Presented at SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition, Nusa Dua, Bali, Indonesia, 20-22 Oct 2015.
[21] Anthony Wright, John Snyder. Instrumented motors prove crucial in unconventional well placement[C]. SPE168031, Presented at IADC/SPE Drilling Conference and Exhibition, Fort Worth, Texas, USA, 4-6 Mar 2014.
[22] 单祥，陈能贵，郭华军，等. 基于岩石物理相的砂砾岩储层分类评价——以准噶尔盆地玛131井区百二段为例[J]. 沉积学报，2016, 34(1):149-157. Shan Xiang, Chen Nenggui, Guo Huajun, et al. Reservoir evaluation of sand conglomerate reservoir based on petrophysical facies: a case study on Bai 2 reservoir in the Ma131 region, Jungar Basin[J]. Acta Sedimentologica Sinica, 2016,34(1):149-157.
[23] 谭开俊，王国栋，罗惠芬，等. 准噶尔盆地玛湖斜坡区三叠系百口泉组储层特征及控制因素[J]. 岩性油气藏，2014,26(6):83-88. Tan Kaijun, Wang Guodong, Luo Huifen, et al. Reservoir characteristics and controlling factors of the Triassic Baikouquan Formation in Mahu slope area, Jungar Basin[J]. Lithologic Reservoirs, 2014, 26(6):83-88.