Application of geology-engineering integration in productivity prediction for stresssensitive tight reservoir: a case study of × block in western Kuqa

doi:10.3969/j.issn.1672-7703.2017.01.009

Abstract

Abstract: The stress sensitivity observed during the production of tight reservoir in western Kuqa was studied and simulated by geomechanicsrelated theories and advanced techniques. It is indicated that the stress sensitivity is essentially the complex variation and interaction among seepage field, ground stress field and fracture status during the production. In order to determine this interaction and its effects on productivity, a numerical simulation of the gas reservoir system, mechanic system and fracture system was carried out by coupling of multi-discipline data, based on the concept of geology-engineering integration. Taking a gas well in No.1 block as an example, the available data of multiple disciplines were analyzed, and reliable 3D gas reservoir model, 3D geomechanics model, and 3D discrete fracture model were built up respectively. Then, the coupling parameters between the models (i.e., stress-permeability relationship and stress-fracture aperture relationship) were determined by physical and numerical experiments. Finally, by a coupling numerical simulation, the changes of ground stress, formation pressure and seepage field with space and time in the designed development plan were identified, and the results obtained were compared with the results of simulation without considering stress sensitivity. The study results show that the permeability and fracture conductivity of stresssensitive reservoirs dropped evidently during production. Generally, the influence of the stress sensitivity on the productivity was large during early stage, decreasing during middle stage, and finally increasing again during later stage. When there was stress sensitivity, both the stable production period and the total production ratio declined greatly. The study results also show that excessive production pressure difference may lead to too fast permeability decline, and cause permanent damage which may hinder the production. Therefore, it is very important to select reasonable production pressure difference.

Key words: geology-engineering integration, fractured tight sandstone, stress sensitivity, seepage-stress coupling, productivity prediction

CLC Number:

Yang Xiangtong, Zheng Zijun, Zhang Yang, Yu Yinhua, Feng Jueyong, Wang Zhenlan, Teng Qi, Dong Jianyi. Application of geology-engineering integration in productivity prediction for stresssensitive tight reservoir: a case study of × block in western Kuqa[J]. China Petroleum Exploration, 2017, 22(1): 61-74.

References

[1] 王招明，谢会文，李勇，等. 库车前陆冲断带深层盐下大气田的勘探和发现[J]. 中国石油勘探，2013,18(3):1-11. Wang Zhaoming, Xie Huiwen, Li Yong, et al. Exploration and discovery of large and deep subsalt gas fields in Kuqa foreland thrust belt[J]. China Petroleum Exploration, 2013, 18(3):1-11. br/>[2] 王招明，李勇，谢会文，等. 库车前陆盆地超深层大油气田形成的地质认识[J]. 中国石油勘探，2016,21(1):37-43. Wang Zhaoming, Li Yong, Xie Huiwen, et al. Geological understanding on the formation of large-scale ultra-deep oil-gas field in Kuqa foreland basin[J]. China Petroleum Exploration, 2016,21(1):37-43. br/>[3] 于忠良, 熊伟, 高树生, 等. 致密储层应力敏感性及其对油田开发的影响[J]. 石油学报, 2007,28(4):95-98. Yu Zhongliang, Xiong Wei, Gao Shusheng, et al. Stress sensitivity of tight reservoir and its influence on oilfield development[J]. Acta Petrolei Sinica, 2007,28(4):95-98. br/>[4] 刘建军, 刘先贵, 胡雅衽, 等. 低渗透储层流—固耦合渗流规律的研究[J]. 岩石力学与工程学报, 2002,21(1):88-92. Liu Jianjun, Liu Xiangui, Hu Yareng, et al. Study of fluid-solid coupling flow in low permeability oil reservoir[J]. Chinese Journal of Rock Mechanics and Engineering, 2002,21(1):88-92. br/>[5] 肖文联，李滔，李闽，等. 致密储集层应力敏感性评价[J]. 石油勘探与开发，2016,43(1):107-114. Xiao Wenlian, Li Tao, Li Min, et al. Evaluation of the stress sensitivity in tight reservoirs[J]. Petroleum Exploration and Development. 2016,43(1):107-114. br/>[6] Jones F O, Owens W W. A laboratory study of low-permeability gas sands[J]. Journal of Petroleum Technology, 1980,32(9):1631-1640. br/>[7] David C,Wong T F, Zhu W L, et al. Laboratory measurement of compaction-induced permeability change in porous rocks: implications for the generation and maintenance of pore pressure excess in the crust[J]. Pure and Applied Geophysics, 1994, 143:425-456. br/>[8] Sigal R F. The pressure dependence of permeability[J]. Petrophysics, 2002,43(2):92-102. br/>[9] 李传亮. 储层岩石的应力敏感性评价方法[J]. 大庆石油地质与开发, 2006,25(1):40-42. Li Chuanliang. Evaluation method for stress sensitivity of reservoir rock[J]. Petroleum Geology & Oilfield Development in Daqing, 2006,25(1):40-42. br/>[10] Dong J J, Hsu J Y, Wu W J, et al. Stress-dependence of the permeability and porosity of sandstone and shale from TCDP hole-A [J]. International Journal of Rock Mechanics & Mining Sciences, 2010,47(7):1141-1157. br/>[11] Zhao Jinzhou, Xiao Wenlian, Li Min, et al. The effective pressure law for permeability of clay-rich sandstones[J]. Petroleum Science, 2011,8(2):194-199. br/>[12] Jones F O. A laboratory study of effects of confining pressure on fracture flow and storage capacity in carbonate rocks[J]. Journal of Petroleum Technology, 1975,27(1):21-27. br/>[13] 尹尚先, 王尚旭. 不同尺度下岩层渗透性与地应力的关系及机理[J]. 中国科学:D 辑: 地球科学, 2006,36(5):472-480. Yin Shangxian, Wang Shangxu. The relationship and mechanism between permeability and formation stress under different scale[J]. Science in China Series D: Earth Sciences, 2006,49(7):714-723. br/>[14] 肖文联, 李闽, 赵金洲, 等. 低渗致密砂岩渗透率应力敏感性试验研究[J]. 岩土力学, 2010,31(3):775-779. Xiao Wenlian, Li Min, Zhao Jinzhou, et al. Laboratory study of stress sensitivity to permeability in tight sandstone[J]. Rock and Soil Mechanics, 2010,31(3):775-779. br/>[15] 邓佳，朱维耀，刘锦霞，等. 考虑应力敏感性的页岩气产能预测模型[J]．天然气地球科学，2013,24(3):456-460. Deng Jia, Zhu Weiyao, Liu Jinxia, et al. Productivity prediction model of shale gas considering stress sensitivity[J]. Natural Gas Geoscience,2013,24(3):456-460. br/>[16] 胥洪俊，范明国，康征，等. 考虑渗透率应力敏感的低渗气藏产能预测公式[J]. 天然气地球科学，2008,19(1):145-147. Xu Hongjun, Fan Mingguo, Kang Zheng, et al. A productivity prediction equation considering rock permeability stress-sensitivity in low-permeability gas reservoirs[J]. Natural Gas Geoscience, 2008,19(1):145-147. br/>[17] 刘峰，王裕亮，陈小凡，等. 考虑应力敏感性的低渗透油藏油井产能分析[J]. 石油与天然气地质，2013,34(1):125-128. Liu Feng，Wang Yuliang，Chen Xiaofan，et al. Analysis on oil well productivity of low-permeability reservoirs with stress-sensitivity being taken into considerations[J]. Oil & Gas Geology, 2013,34(1):125-128. br/>[18] 苟燕，孙军昌，杨正明，等. 复杂岩性储层渗透率—应力敏感性及其对气井产能的影响[J]. 岩土力学，2014,35(9):2535-2542. Gou Yan, Sun Junchang, Yang Zhengming, et al. Permeability-stress sensitivity of complex lithology reservoir and its effect on gas well productivity[J]. Rock and Soil Mechanics, 2014,35(9):2535-2542. br/>[19] 罗晓容，张立宽，雷裕红，等. 储层结构非均质性及其在深层油气成藏中的意义[J]. 中国石油勘探，2016,21(1):28-36. Luo Xiaorong, Zhang Likuan, Lei Yuhong, et al. Structural heterogeneity of reservoirs and its implication on hydrocarbon accumulation in deep zones[J]. China Petroleum Exploration, 2016,21(1):28-36. br/>[20] 王珂，戴俊生，张法国，等. 裂缝性储层应力敏感性数值模拟——以库车坳陷克深气田为例[J]. 石油学报，2014,35(1):123-133. Wang Ke, Dai Junsheng, Zhang Faguo, et al. Numerical simulation of fractured reservoir stress sensitivity: a case from Kuqa depression Keshen gas field[J]. Acta Petrolei Sinica, 2014, 35(1):123-133. br/>[21] 宋岩, 赵孟军, 方世虎, 等. 中国中西部前陆盆地油气分布控制因素[J]. 石油勘探与开发, 2012,39(3):265-274. Song Yan, Zhao Mengjun, Fang Shihu, et al. Dominant factors of hydrocarbon distribution in the foreland basins, central and western China[J]. Petroleum Exploration and Development, 2012,39(3):265-274. br/>[22] 张惠良，张荣虎，杨海军，等. 构造裂缝发育型砂岩储层定量评价方法及应用——以库车前陆盆地白垩系为例[J]. 岩石学报，2012,28(3):827-835. Zhang Huiliang, Zhang Ronghu, Yang Haijun, et al. Quantitative evaluation methods and applications of tectonic fracture developed sand reservoir: a Cretaceous example from Kuqa foreland basin[J]. Acta Petrologica Sinica, 2012,28(3):827-835.