基于真三轴试验装置的岩石渗流密封方式改进及实验研究  

Improvement of the Seepage Sealing Method and Test of Rock Based on the True Triaxial Test Device

作　　者：武鹏飞[1,2] 雒小飞 王建美[1,2] 宋晓夏 王建龙[1,2] WU Pengfei;LUO Xiaofei;WANG Jianmei;SONG Xiaoxia;WANG Jianlong(Key Laboratory of In-situ Property-improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学原位改性采矿教育部重点实验室,太原030024 [2]太原理工大学矿业工程学院,太原030024

出　　处：《实验科学与技术》2024年第1期121-126,共6页Experiment Science and Technology

基　　金：国家自然科学基金(51904196);山西省科技重大专项项目(20201102002);山西省基础研究计划面上项目(202103021224059)。

摘　　要：国内现有的非常规油气储层的渗透性测试大多采用圆柱试样,通过假三轴试验装置进行测试,而真三轴条件下立方体试件棱边大多存在棱边串流与端面密封不严的缺陷。基于现有真三轴试验装置,以及大量的实验经验,针对现有的立方体试件单橡胶套渗流密封方式进行改进。介绍了嵌套式“上下密封套”结构特征,特别对棱边区的密封进行了设计,提出了密封套顶-底端面凹陷型内嵌“单孔网槽导流板”结构设计,并对顶部传压板的尺寸进行了讨论。对100 mm×100 mm×100 mm立方体煤样进行了真三轴渗流试验分析,得到了不同入口渗透压力真三轴围压条件下的渗透率。该密封方法的改进有助于提高科研单位及测试中心对原位地应力条件下非常规油气储层渗透性测试精度,并提高高端科研人才的实践创新能力与科研素养。Most of the existing unconventional oil and gas reservoirs in China are tested with cylindrical samples by the false triaxial test device.However,under the condition of true triaxial,the edges of cube specimens are mostly deficient in edge flow and face seal.Based on the existing true triaxial test device and a large number of experiments,the existing seepage sealing method of cube specimen with single rubber sleeve was improved.This paper introduces the structural features of nested sealing sleeve,especially the design of the seal in the edge area,puts forward the structural design of the top and bottom end of the sealing sleeve concave with a single hole mesh groove,and discusses the size of the top pressure transfer plate.Taking the 100 mm×100 mm×100 mm cubic coal sample as an example,the true triaxial seepage test analysis was carried out,and the permeability under different inlet seepage pressures under true triaxial confining pressures was obtained.The improvement of the sealing methodddd is helpful to improve the permeability test accuracy of unconventional oil and gas reservoirs under in-situ stress conditions in scientific research institutions and testing centers,and improve the practical innovation ability and scientific research accomplishment of high-end scientific research talents.

关 键 词：非常规油气储层 真三轴试验装置 渗透性 密封套 密封方法 

分 类 号：TD802[矿业工程—矿山开采]