青海共和盆地干热岩注采大尺度物理模拟实验  

Large-scale physical simulation of injection and production of hot dry rock in Gonghe Basin,Qinghai Province,China

作　　者：赵鹏 朱海燕 李根生[4] 陈作[5] 陈世杰 上官拴通 齐晓飞 ZHAO Peng;ZHU Haiyan;LI Gensheng;CHEN Zuo;CHEN Shijie;SHANGGUAN Shuantong;QI Xiaofei(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;College of Energy,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;Sinopec Research Institute of Petroleum Engineering Co.Ltd.,Beijing 102206,China;The Second Geological Team of Hebei Coal Field Geology Bureau(Hebei Hot Dry Rock Research Center),Xingtai 054000,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [2]成都理工大学油气藏地质及开发工程全国重点实验室,成都610059 [3]成都理工大学能源学院,成都610059 [4]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [5]中国石化石油工程技术研究院有限公司,北京102206 [6]河北省煤田地质局第二地质队(河北省干热岩研究中心),河北邢台054000

出　　处：《石油勘探与开发》2024年第3期646-654,共9页Petroleum Exploration and Development

基　　金：国家自然科学基金重大项目课题“开采过程多场时空演变规律与流动调控方法”(52192622);国家自然科学基金青年基金“增强型地热系统注采过程热-流-固-化耦合裂缝形变机制与流动换热调控方法研究”(52304003)。

摘　　要：基于自主研制的真三轴多物理场原位注采大型物理模拟实验系统,开展了青海共和干热岩多井长期注采物理模拟实验。通过多井连通性实验获得了岩样内部天然裂缝系统的空间分布特征以及各裂缝与井筒的连通情况,在此基础上选择注入井和生产井,开展了一注两采和一注一采实验,系统分析了生产井的开采流量、开采温度、采热速率和流体采收率随持续注采的变化规律。结果表明:在热冲击、注入压力联合作用下,裂缝导流能力增强,生产井开采温度表现为下降趋势,且流量越大下降越快;当裂缝局部闭合区域逐渐激活,产生新的换热面积,开采温度升高或下降速率降低;采热速率主要由开采流量、注入和采出流体的温度差控制,当滤失通道导流能力增强,生产井流体采收率快速下降;优势通道和换热流体滤失对采热性能的影响机制有所区别,前者限制换热面积,后者影响采出流体流量,二者都是影响干热岩长期高效开发的重要因素。Based on the independently developed true triaxial multi-physical field large-scale physical simulation system of in-situ injection and production,we conducted physical simulation on the long-term injection and production of multiple wells in the hot dry rocks in the Gonghe Basin of Qinghai Province,NW China.By virtue of multi-well connectivity experiments,the spatial distribution characteristics of the natural fracture system in the rock samples and the connectivity between fracture and wellbore were clarified.The injection and production wells were selected to conduct the experiments,namely one injection well and two production wells,one injection well and one production well.The variation of several physical parameters in the production well was analyzed,such as the flow rate,the temperature,the heat recovery rate and the fluid recovery.The results show that under the combination of thermal shock and injection pressure,the fracture conductivity was enhanced,and the production temperature showed a downward trend.The larger the flow rate,the faster the decrease.When the local closed area of the fracture was gradually activated,new heat transfer areas were generated,resulting in a lower rate of increase or decrease in the mining temperature.The heat recovery rate was mainly controlled by the extraction flow rate and the temperature difference between injection and production fluid.As the conductivity of the leak-off channel increased,the fluid recovery of the production well rapidly decreased.The influence mechanisms of dominant channels and fluid leak-off on thermal recovery performance are different.The former limits the heat exchange area,while the latter affects the flow rate of the produced fluid.Both of them are important factors affecting the long-term and efficient development of hot dry rock.

关 键 词：干热岩 注采模拟实验 采热性能 导流能力 优势通道 流体滤失 

分 类 号：TE122.3[石油与天然气工程—油气勘探]