青海共和盆地干热岩地热储层水力压裂物理模拟和裂缝起裂与扩展形态研究

详细信息    查看全文 | 推荐本文 |

英文篇名：Experimental Study on Hydraulic Fracturing Physics Simulation, Crack Initiation and Propagation in Hot Dry Rock Geothermal Reservoir in Gonghe Basin, Qinghai 作者：周舟 ; 金衍 ; 曾义金 ; 张旭东 ; 周健 ; 汪文智 ; 孟翰 英文作者：Zhou Zhou;Jin Yan;Zeng Yijin;Zhang Xudong;Zhou Jian;Wang Wenzhi;Meng Han;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum;Sinopec Research Institute of Petroleum Engineering; 关键词：干热岩 ; 水力压裂 ; 起裂模型 ; 扩展形态 ; 共和盆地 ; 储层 ; 地热 英文关键词：hot dry rock;;hydraulic fracturing;;initiation model;;fracture propagation;;Gonghe basin;;reservoirs;;geotherm 中文刊名：吉林大学学报(地球科学版) 英文刊名：Journal of Jilin University(Earth Science Edition) 机构：中国石油大学(北京)油气资源与探测国家重点实验室;中国石化石油工程技术研究院; 出版日期：2019-09-26 出版单位：吉林大学学报(地球科学版) 年：2019 期：05 基金：国家重点研发计划项目(2018YFB1501802-03);; 中国石油大学(北京)科研基金项目(2462016YJRC017)~~ 语种：中文; 页：220-225 页数：6 CN：22-1343/P ISSN：1671-5888 分类号：P314

摘要

水力压裂是青海共和盆地干热岩地热资源开发的难点技术问题之一。本文基于升级改造的大尺寸真三轴水力压裂物理模拟实验系统模拟干热岩储层高温高压环境,利用青海共和盆地露头岩心进行水力压裂物理模拟实验,揭示干热岩储层水力裂缝的起裂和扩展规律。通过物理模拟实验发现:干热岩储层裂缝起裂可以通过文中提出的起裂模型判断起裂方式和预测起裂压力;水力裂缝在岩石基质中的扩展形态简单,仅沿最大主应力方向延伸;但是水力裂缝会受到岩石中弱面的影响,发生转向沿弱面延伸,形成较复杂的裂缝形态。因此,建议在干热岩储层实际施工中,在天然裂缝发育较丰富的层段开展水力压裂,以实现复杂裂缝网络提取地热能。
        Hydraulic fracturing is one of the most important technical challenges in the development of hot dry rock geothermal reservoirs in Gonghe basin, Qinghai. Based on the advanced large-scale true triaxial hydraulic fracturing simulation experimental system, the authors studied the hydraulic fracture initiation and propagation in hot dry rock geothermal formations with high temperature and high pressure. The samples were from the outcrop core of Gonghe basin. According to the experimental result, the hydraulic fracture initiation and pressure could be predicted by the crack initiation model proposed in this paper. The propagation in the hot dry rock matrix has a simple extension along only with the direction of the maximum horizontal stress. The hydraulic fractures, however, are affected by natural fractures to achieve larger stimulation reservoir volume. Therefore, it is suggested that in the field, the hydraulic fracturing treatment should be in the formations rich in natural fractures so as to get a complex fracture network for geothermal energy extracting.

引文

[1] 陈勉,陈治喜,黄荣樽.大斜度井水压裂缝起裂研究[J].石油大学学报(自然科学版),1995,19(2):30-35.Chen Mian,Chen Zhixi,Huang Rongzun.Research on Hydraulic Fracture Cracking in High Angle Wells[J].Journal of the University of Petroleum (Natural Science Edition),1995,19(2):30-35.
    [2] Ishida T,Chen Q,Mizuta Y.Effect of Injected Water on Hydraulic Fracturing Deduced from Acoustic Emission Monitoring[J].Pure and Applied Geophysics,1997,150:627-646.
    [3] 金衍,陈勉.天然裂缝地层斜井水力裂缝起裂压力模型研究[J].石油学报,2006,27(5):124-126.Jin Yan,Chen Mian.Hydraulic Fracturing Initiation Pressure Models for Directional Wells in Naturally Fractured Formation[J].Journal of Petroleum,2006,27(5):124-126.
    [4] Hunt S P,Morelli C P.Cooper Basin HDR Seismic Hazard Evaluation:Predictive Modelling of Local Stress Changes Due to HFR Geothermal Energy Operations in South Australia[R].Adelaide:University of Adelaide,2006:50.
    [5] Zhou J,Chen M,Jin Y.Analysis of Fracture Propagation Behavior and Fracture Geometry Using a Tri-Axial Fracturing System in Naturally Fractured Reservoirs[J].International Journal of Rock Mechanics Mining Science and Geomechanics,2008,45:1143-1152.
    [6] Reinicke A,Rybacki E,Stanchits S.Hydraulic Fracturing Stimulation Techniques and Formation Damage Mechanisms-Implications from Laboratory Testing of Tight Sandstone-Proppant Systems[J].Chemie der Erde-Geochemistry,2010,70(Sup.3):107-117.
    [7] 卢运虎,陈勉,金衍.各向异性地层斜井井壁稳定性研究[J].石油学报,2013,34 (3):563-568.Lu Yunhu,Chen Mian,Jin Yan.Borehole Instability Mechanism of a Deviated Well in Anisotropic Formations[J].Journal of Petroleum,2013,34 (3):563-568.
    [8] Frash L P,Gutierrez M,Hampton J.True-Triaxial Apparatus for Simulation of Hydraulically Fractured Multi-Borehole Hot Dry Rock Reservoirs[J].International Journal of Rock Mechanics & Mining Sciences,2014,70:496-506.
    [9] 许天福,张延军,于子望.干热岩水力压裂实验室模拟研究[J].科技导报,2015,33(19):22-27.Xu Tianfu,Zhang Yanjun,Yu Ziwang.Laboratory Study of Hydraulic Fracturing on Hot Dry Rock[J].Technology Review,2015,33(19):22-27.
    [10] 樊冬艳,孙海,姚军.增强型地热系统不同注采井网参数分析[J].吉林大学学报(地球科学版),2019,49(3):798-807.Fan Dongyan,Sun Hai,Yao Jun.Parametric Analysis of Different Injection and Production Well Pattern in Enhanced Geothermal System[J].Journal of Jilin University (Earth Science Edition),2019,49(3):798-807.
    [11] 金衍,陈勉.天然裂缝地层垂直井水力裂缝起裂压力模型研究[J].石油学报,2005,26(7):113-114.Jin Yan,Chen Mian.Initiation Pressure Models for Hydraulic Fracturing of Vertical Wells in Naturally Fractured Formation[J].Journal of Petroleum,2005,26(7):113-114.