天然气水合物岩心样品带压参数测试系统与实验研究  

Testing system and experimental study on pressure parameters of natural gas hydrate core samples

作　　者：鲁浩然 卢春华[1] 黄柳松 谭畴江 乔梦迪 LU Haoran;LU Chunhua;HUANG Liusong;TAN Choujiang;QIAO Mengdi(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,武汉430074

出　　处：《石油科学通报》2025年第1期156-168,共13页Petroleum Science Bulletin

基　　金：国家重点研发计划战略性国际科技创新合作重点专项“天然气水合物勘查开发技术联合研究”(2018YFE0208200)资助。

摘　　要：天然气水合物被认为极有可能成为未来最有远景的新型接替能源,引起世界各国的广泛关注。天然气水合物性能参数带压测试分析,对解释赋存于地层中的水合物生长机理与预测水合物分解过程中地层物理力学性质变化等极为重要,更是构建上述复杂情况下水合物赋存地层行为预测模型的关键所在,对评估储层内天然气水合物赋存方式和资源量都具有重要意义。通过地震或者测井所得数据对水合物岩心各项参数进行估算往往与实际值存在较大误差,且在现有技术条件下又很难进行原位地层参数测试,所以通过钻井获取水合物地层岩心再对其物理化学及力学性质进行测试与分析是最为可靠的方法。欧盟、美国、德国等少数发达国家和地区已成功研制出水合物保真岩心样品后处理和现场测试分析装置并在生产现场应用,中国目前与深部海洋天然气水合物保压取样钻具对接的岩心现场测试分析和后处理技术仍不成熟,现场测试多数依靠国外相关检测装置和检测方法。本文介绍了一种天然气水合物保压岩心样品现场参数测试分析系统的工作原理、关键技术及相关实验研究。该系统主要由岩心抓捕和切割单元,取样器保压单元,岩心样品参数测试单元,岩心样品存储单元、温度和压力维持单元等组成,论文详细介绍了各单元的结构和工作原理。为了验证参数测试系统的工作性能及不同压力环境对参数测试的影响,制备了3种不同组分的模拟岩心,在不同压力下进行了纵波波速、电阻率和剪切强度测试。研究表明:该天然气水合物岩心样品带压参数测试系统能够在30 MPa的高压下稳定可靠工作;压力对岩心样品电阻率的影响不大;对波速测试有影响,压力越大,纵波波速度越大;压力对岩心剪切强度的影响也比较大。Natural gas hydrates are considered highly likely to become the most promising new alternative energy source in the future,attracting widespread attention from countries around the world.The analysis of performance parameters of natural gas hydrates through pressure testing is extremely important for explaining the growth mechanism of hydrates existing in the formation and predicting changes in the physical and mechanical properties of the formation during hydrate decomposition.It is also the key to constructing a prediction model for the occurrence behavior of gas hydrates in the complex situations mentioned above,which is of great significance for evaluating the occurrence mode and resource quantity of natural gas hydrates in the reservoir.Estimating various parameters of hydrate cores using seismic or logging data often results in significant errors from actual values,and it is difficult to conduct in-situ formation parameter testing under existing technical conditions.So obtaining hydrate formation cores through drilling and testing their physical,chemical,and mechanical properties is the most reliable method.A few developed countries and regions,such as the European Union,the United States,and Germany,have successfully developed post-processing and on-site testing analysis devices for hydrate fidelity core samples and applied them in production sites.Currently,China’s on-site testing analysis and post-processing technology for core samples connected to deep marine natural gas hydrate pressure sampling drilling tools is still immature,and most on-site testing relies on relevant foreign detection devices and methods.This article introduces the working principle,key technologies,and related experimental research of a field parameter testing and analysis system for natural gas hydrate pressure retaining core samples.The system is mainly composed of core capture and cutting units,sampler pressure maintaining units,core sample parameter testing units,core sample storage units,temperature and pressure maintaining

关 键 词：天然气水合物 保压 岩心样品 参数测试 实验研究 

分 类 号：P634.43[天文地球—地质矿产勘探] TE921.3[天文地球—地质学]