Article(id=1322941843410911316, tenantId=1146029695717560320, journalId=1322258508890079423, issueId=1322941842395889747, articleNumber=null, orderNo=null, doi=10.13809/j.cnki.cn32-1825/te.2025480, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1765900800000, receivedDateStr=2025-12-17, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793343514540, onlineDateStr=2026-10-30, pubDate=1784995200000, pubDateStr=2026-07-26, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793343514540, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793343514540, creator=13701087609, updateTime=1793343514540, updator=13701087609, issue=Issue{id=1322941842395889747, tenantId=1146029695717560320, journalId=1322258508890079423, year='2026', volume='16', issue='4', pageStart='737', pageEnd='948', issueExtLink='null', onlineDate='null', pubDate='1784995200000', pubDateStr='2026-07-26', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793343514297, creator='13701087609', updateTime=1793344192960, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322944689019695905, tenantId=1146029695717560320, journalId=1322258508890079423, issueId=1322941842395889747, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322944689019695906, tenantId=1146029695717560320, journalId=1322258508890079423, issueId=1322941842395889747, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=769, endPage=777, ext={EN=ArticleExt(id=1322941845319319639, articleId=1322941843410911316, tenantId=1146029695717560320, journalId=1322258508890079423, language=EN, title=Experimental study on stress sensitivity of coal rock permeability considering pore pressure decline rate, columnId=1322941845239627862, journalTitle=Petroleum Reservoir Evaluation and Development, columnName=Young Scientists Forum, runingTitle=null, highlight=

Deep coal-rock gas has become an important target for increasing natural gas reserves and production in China. Field practice has demonstrated that there is a correlation between the production rate of deep coal-rock gas in the Daning-Jixian area and the economically recoverable reserves controlled by gas wells. However, existing stress-sensitivity response relationships for coal rock fail to effectively reflect this phenomenon, particularly the differentiated response of permeability to stress paths, i.e., different pressure decline rates. This study investigated the influence of stress paths on the stress sensitivity of permeability, especially the relationship between pore pressure decline rate and permeability during pressure decline process. By simulating the pore pressure variation process, the permeability evolution of coal-rock reservoirs under different stress conditions was systematically analyzed. Permeability experiments were conducted using a pulse-decay method for unconventional reservoir cores. By adjusting the average pressures of the upstream and downstream standard chambers, different pore pressure decline rates (stress paths) were simulated. Four core samples from the No. 8 coal seam of the Baode Mine on the eastern margin of the Ordos Basin were tested to investigate permeability variation trends of coal rock and its irreversibility under different pressure decline paths. The results showed that, with pore pressure decreasing, the matrix permeability of coal rock generally exhibited an exponential decline, characterized by a rapid decrease in the early stage followed by a slower decline in the later stages. Normalization analysis indicated that permeability recovery during unloading was relatively slow and failed to return to the initial value. Moreover, the decline amplitude of the unloading curve was smaller than that of the loading curve, demonstrating a pronounced hysteresis effect. Regression analysis of pressure decline rate and permeability change rate for different core samples revealed that, indicating differentiated responses of the stress sensitivity of coal-rock permeability under different loading rates, within a certain range, the speed of pressure drop directly affects the stress-sensitive response of coal and rock permeability. Field statistical observations further confirmed the sensitivity of coal-rock permeability to the pore pressure decline rate.

, articleAbstract=null, authors=SUYANG ZHU1, XINYU ZENG1, SHENG ZHANG2, WEI LIU1, authorsList=SUYANG ZHU, XINYU ZENG, SHENG ZHANG, WEI LIU, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322941847340974186, articleId=1322941843410911316, tenantId=1146029695717560320, journalId=1322258508890079423, language=CN, title=考虑孔隙压降速度的煤岩渗透率应力敏感实验研究, columnId=1322941845415788632, journalTitle=油气藏评价与开发, columnName=青年科学家论坛, runingTitle=null, highlight=

深层煤岩气已成为中国天然气增储上产的重要方向,实践证明大宁—吉县的深层煤岩气采出速度与气井控制的经济可采储量之间存在一定关系,但现有的煤岩应力敏感响应关系并不能有效反映这一现象,尤其未能体现渗透率对应力路径(压降速度)的差异化响应规律。研究针对应力路径对渗透率应力敏感的影响,特别是压降过程中孔隙压降速度与渗透率之间的关系,通过模拟孔隙压力变化过程,分析不同应力条件下煤岩储层渗透率的变化规律。实验采用非常规储层岩心脉冲法测试渗透率,调节上、下游标准舱室的平均压力,模拟不同的孔隙压降速度(应力路径),对鄂尔多斯盆地东缘保德煤矿8号煤层的4块岩心进行测试,研究煤岩在不同压降路径下的渗透率变化趋势及其不可逆性。结果表明:随着孔隙压力的降低,煤岩基质渗透率大致呈指数式递减,并呈现出下降趋势先快后慢的变化特点;归一化分析显示,卸载过程中渗透率恢复较缓慢,未能恢复到初始值,且卸载曲线的下降幅度小于加载曲线,表现出明显的滞后效应。对不同岩心的压降速度和渗透率变化率拟合分析发现,煤岩在不同加载速度时渗透率应力敏感程度存在差异化响应,且在一定范围内,压降速度的快慢直接影响到煤岩渗透率应力敏感的响应。基于现场统计规律,亦证实了煤岩渗透率对孔隙压降速度的敏感性。

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朱苏阳(1989—),博士,副教授,主要从事煤层气、缝洞型油气藏工程与数值模拟方面的科研与教学工作。地址:四川省成都市新都区西南石油大学石油与天然气工程学院,邮政编码:610500。E-mail:

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朱苏阳(1989—),博士,副教授,主要从事煤层气、缝洞型油气藏工程与数值模拟方面的科研与教学工作。地址:四川省成都市新都区西南石油大学石油与天然气工程学院,邮政编码:610500。E-mail:

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朱苏阳(1989—),博士,副教授,主要从事煤层气、缝洞型油气藏工程与数值模拟方面的科研与教学工作。地址:四川省成都市新都区西南石油大学石油与天然气工程学院,邮政编码:610500。E-mail:

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China Petroleum Exploration, 2024, 29(4): 142-155., articleTitle=Gas occurrence and production characteristics of deep coal measure gas and reserve estimation method and indicators in Daning-Jixian block, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1322941847613603947, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, xref=1, ext=[AuthorCompanyExt(id=1322941847621992556, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, companyId=1322941847613603947, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1 Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China), AuthorCompanyExt(id=1322941847634575469, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, companyId=1322941847613603947, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1 西南石油大学石油与天然气工程学院,四川   成都 610500)]), AuthorCompany(id=1322941847718461550, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, xref=2, ext=[AuthorCompanyExt(id=1322941847726850159, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, companyId=1322941847718461550, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2 Jingmen PetroChina Kunlun Gas Company Limited, Jingmen, Hubei 448000, China), AuthorCompanyExt(id=1322941847735238768, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, companyId=1322941847718461550, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2 荆门中石油昆仑燃气有限公司,湖北   荆门 448000)])], figs=[ArticleFig(id=1322941851472363663, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, language=EN, label=Fig.1, caption=Production variation pattern of deep coal-rock gas, figureFileSmall=Tdb2YZ9RnzWfsbWNZNkSjw==, figureFileBig=RnxOy59afgkr0mVwrMS79g==, tableContent=null), ArticleFig(id=1322941851564638352, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, language=CN, label=图1, caption=深层煤岩气产量变化模式, figureFileSmall=Tdb2YZ9RnzWfsbWNZNkSjw==, figureFileBig=RnxOy59afgkr0mVwrMS79g==, tableContent=null), ArticleFig(id=1322941851816296593, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, language=EN, label=Fig.2, caption=Core samples collected from No. 8 coal seam in underground Baode Mine on eastern margin of Ordos Basin, figureFileSmall=oiyR9LzZVbh/oSKd+8tumA==, figureFileBig=m5z99GzS0EV9gXjeZciXuA==, tableContent=null), ArticleFig(id=1322941851887599762, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, language=CN, label=图2, caption=鄂尔多斯盆地东缘保德矿井下8号煤取样岩心, figureFileSmall=oiyR9LzZVbh/oSKd+8tumA==, figureFileBig=m5z99GzS0EV9gXjeZciXuA==, tableContent=null), ArticleFig(id=1322941851954708627, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, language=EN, label=Fig.3, caption=Experimental setup and flowchart for coal-rock gas stress sensitivity experiments, figureFileSmall=1kRf13SS+GxHyKnZaGQmzw==, figureFileBig=FnKNV4GOT2lJnE83qNuA3A==, tableContent=null), ArticleFig(id=1322941852034400404, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322941843410911316, language=CN, label=图3, caption=煤岩气应力敏感实验装置和流程

注:1为高压氮气瓶;2、4、7、8、10、13为二通阀;3为真空泵;5为上游标准舱室;6、15为压力传感器;9为岩心夹持器;11为围压泵;12为恒温箱;14为下游标准舱室;16为计算机。

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考虑孔隙压降速度的煤岩渗透率应力敏感实验研究
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朱苏阳 1 , 曾欣雨 1 , 张圣 2 , 刘伟 1
油气藏评价与开发 | 青年科学家论坛 2026,16(4): 769-777
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油气藏评价与开发 |青年科学家论坛 2026 , 16 (4) : 769 -777
考虑孔隙压降速度的煤岩渗透率应力敏感实验研究
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朱苏阳1 , 曾欣雨1, 张圣2, 刘伟1
作者信息
  • 1 西南石油大学石油与天然气工程学院,四川   成都 610500
  • 2 荆门中石油昆仑燃气有限公司,湖北   荆门 448000
作者简介:

朱苏阳(1989—),博士,副教授,主要从事煤层气、缝洞型油气藏工程与数值模拟方面的科研与教学工作。地址:四川省成都市新都区西南石油大学石油与天然气工程学院,邮政编码:610500。E-mail:

Experimental study on stress sensitivity of coal rock permeability considering pore pressure decline rate
SUYANG ZHU1 , XINYU ZENG1, SHENG ZHANG2, WEI LIU1
Affiliations
  • 1 Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • 2 Jingmen PetroChina Kunlun Gas Company Limited, Jingmen, Hubei 448000, China
出版时间: 2026-07-26 doi: 10.13809/j.cnki.cn32-1825/te.2025480
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深层煤岩气  /  基质渗透率  /  应力敏感  /  压降速度  /  塑性变形
deep coal-rock gas  /  matrix permeability  /  stress sensitivity  /  pressure decline rate  /  plastic deformation
朱苏阳, 曾欣雨, 张圣, 刘伟. 考虑孔隙压降速度的煤岩渗透率应力敏感实验研究. 油气藏评价与开发, 2026 , 16 (4) : 769 -777 . DOI: 10.13809/j.cnki.cn32-1825/te.2025480
SUYANG ZHU, XINYU ZENG, SHENG ZHANG, WEI LIU. Experimental study on stress sensitivity of coal rock permeability considering pore pressure decline rate[J]. Petroleum Reservoir Evaluation and Development, 2026 , 16 (4) : 769 -777 . DOI: 10.13809/j.cnki.cn32-1825/te.2025480
中国在鄂尔多斯盆地突破了深层煤岩气高效开发的技术瓶颈[1],实现了将丰富的中国深层煤岩气储量资源(2 000 m以深的煤岩气资源量为40.71×1012 m3)的高效产量转化,使得深层煤岩气资源成为中国天然气开发的重要领域[2-5],与浅部相比,深层煤岩气具有压力高、温度高、含气量大、厚度大、游离气饱和度高、煤体硬度大和渗透率低的特点[6-9]。页岩气的开发实践表明,生产制度(配产比例)明显影响了气井的渗透率应力敏感行为和控制可采储量[10-11]。深层煤岩气的有效开发与页岩气类似,主要依赖于水平井多段压裂技术所形成的复杂裂缝网络,压裂后游离气在早期迅速产出,随着裂缝网络压力逐渐降低,基质中的气体(包括吸附气、残余游离气)得到持续释放,实现对深层煤岩气的稳定动用[12-13]。
煤岩气排采实践与室内实验均证实了煤的渗透率对应力具有较强的敏感性[14-15],煤岩应力敏感性研究主要包括常规围压和孔隙压力条件下的应力敏感性实验、微观机理研究和评价[16-17]。通过原煤和型煤的围压等幅循环加载-卸载渗流实验,明确了煤岩对应力的响应特征符合一般岩石应力敏感的变化趋势[18],虽然趋势一致,但是煤岩渗透率应力敏感的微观机制则与常规岩石存在明显的差异[19]。利用岩石力学真三轴实验机和声发射监测系统进行单轴加载试验和三轴加载-卸载实验,煤岩的应变对应力路径的响应会存在一定的差异[20-21],说明煤岩在三轴应力下的弹性变形往往伴随着一定的塑性变形[22]。目前,此类研究多集中于采矿与路桥工程的应变研究,还缺乏煤岩渗透率对应力路径的响应关系的实验探索。
以鄂尔多斯盆地东缘保德煤矿8号煤层煤岩为研究对象,考虑了应力路径对渗透率应力敏感的影响,特别是压降过程中孔隙压降速度与渗透率之间的关系,通过模拟孔隙压力变化过程,分析了不同应力条件下煤岩储层渗透率的变化规律[20-21]。
由于煤岩气链式流动的赋存与运移特征,煤岩气需依次经历基质-割理-压裂缝的串联通道才能被采出,因此,深层煤岩气压裂改造后的生产动态表现出显著的缝控可采储量特征,即后期稳产产量与压裂改造规模呈明显的正相关关系,基质向割理的流动速率是制约气井产量与可动用储量的关键因素(图1)。目前,深层煤岩气长水平井+超规模压裂的改造方式可以密切割煤层,极大缩短游离气和吸附气在基质中的传输距离,快速释放基质中的气体,加速基质中的煤岩气的流动速率,实现由不可动用储量向可动用储量的转化。
煤岩气井全生产周期可划分为返排上产、高产稳产、递减、稳产4个阶段(图1)[22]。各个阶段的产能特征均与压裂缝网的结构特征相关。在返排上产阶段,气井主要处于返排阶段,日产气量逐步增加并进入高产期;高产稳产阶段主要受游离气储量、缝网密度、主裂缝长度及缝网导流能力等因素控制,产量稳定;随着大量游离气的开采,受解吸速率影响,解吸气量低于游离气产出量,气井由高产稳产阶段向递减阶段过渡;进入稳产期后,液量、排量、簇数与解吸速率一同影响稳产阶段的稳产时间和产量[23-25]。
煤岩通常被视为典型的基质-裂隙双重孔隙介质,虽然,基质渗透率极低,但其吸附气含量超过70%,因此,基质渗透率的应力敏感性对长期的吸附气储量释放具有主导意义。生产过程中,基质中的吸附气首先向割理扩散,再通过天然裂缝流入压裂缝,随着游离气逐渐被动用,吸附气在产气中的占比提高,基质对裂缝系统的补给比例升高,基质渗透能力对产能的影响逐渐增大(图1)。前期生产制度的设置,特别是对压降速度的控制,直接影响储层渗透率的损失程度,进一步对中后期的产能表现产生显著影响。所以,亟须研究深层煤岩基质在不同有效应力下的渗透率变化特征。煤岩气产出过程遵循“解吸—扩散—渗流”机制[26-27]。其中,基质渗透率是影响气体从煤岩基质扩散到割理的重要因素。当基岩渗透率较高时,气体能快速高效地扩散到割理,从而提升气井产能;当基岩渗透率较低时,流动通道受限和扩散速率减缓导致气井产能降低。因此,基质渗透率是影响后期稳产产量的主要因素。
若开采前期采速过高,进入稳定生产阶段时割理压力过低,从而导致基质中的应力敏感效应显著降低气井的稳定产量并缩短稳产时间。同时,过快的采速会使割理压力下降过快,导致基质中的气体扩散到割理的速度减缓,进一步减少气井的稳定产量[28]。因此,合理控制初期采速、避免割理压力过低,减缓基质渗透率下降速度,是确保后期煤岩气稳定生产的关键,研究煤岩基质渗透率对应力路径的应力敏感性是一个亟待解决的问题。
研究取样来自鄂尔多斯盆地东缘保德煤矿井下8号煤层,煤层位于山西组底部砂岩之上,矿区内最上部可采煤层以厚煤层为主,煤层平均厚度为7.62 m。保德煤矿8号煤层全区分布稳定,存在二分型或三分型的夹矸,为典型的复杂结构煤层,与大宁—吉县深层8号煤层特征基本一致。为更好地对研究区煤层特征进实验分析研究,依据中华人民共和国国家标准《岩心分析方法》(GB/T 29172—2012),避开夹矸部位选取结构裂隙发育少的大块煤钻取25 mm×50 mm圆柱样,圆柱体煤样的钻取方向平行于煤层层面方向,2号和4号岩心边缘存在一定程度的碎裂(主体完整,不影响实验),以胶带进行固定(图2)。
钻取柱样后选取4块煤样进行基本工业分析和物性分析(表1),样品工业分析测试依据ISO 17246:2024《煤炭与焦炭工业分析》(Coal and coke—Proximate analysis);镜质组反射率的测定依据ISO 7404-5:2025《煤岩相分析方法第5部分:镜质体反射率的显微测定方法》(Coal—Methods for petrographic analysis—Part 5:Method of determining microscopically the reflectance of vitrinite)。
研究采用产自法国的超低渗气体渗透率测定仪(Low Gas Permeability Measurement 700),对不同应力条件下岩心样品的孔隙度和渗透率进行测量。研究所用仪器的渗透率测试下限可达10×10-3 µm2,围压最高可达70 MPa,孔隙流体压力最高可达20 MPa,能够满足煤岩岩样基础物性参数的测试需求。具体实验流程如图3所示:岩心两端分别用柱塞连接上游与下游标准舱室,实验开始时上游和下游标准舱室先达到平衡压力,接着上游标准舱室产生一个短暂的脉冲压力使内部压力升高,上下游标准舱室间形成压力差,在该压力差的作用下气体开始流动,直至岩心两端压力再次达到平衡状态,最后,依据中华人民共和国国家标准《页岩孔隙度、渗透率和饱和度测定》(GB/T 34533-2023),对超低渗气体渗透率测定仪所产生的压力波动曲线进行分析,得出深层煤岩的渗透率。
利用非稳态方法得到的气测渗透率公式如下:
K=-s1μLfzf1Apm(1/V1+1/V2)
式中:K为气测渗透率,单位10-3 µm2;s1为测试中上、下游标准舱室压差与时间在单对数坐标图中曲线斜率,单位s-1;μ为黏度,单位mPa·s;L为岩心长度,单位cm;fz为实际气体偏离理想气体的特性值;f1为流量校准因子;A为岩心的横截面积,单位cm2;pm为测试平均压力,单位kPa;V1和V2分别为上、下游舱室体积,单位mL。
研究过程中,渗透率测试实验设定的固定围压介于39~40 MPa,参考大宁—吉县区块返排初期套压递减规律情况设定压降速度,现场监测数据的分析结果表明首周日均压降速度可达1.0~1.5 MPa/12 h。实验过程中为保证操作可行性与压力控制的稳定性,采用12 h为一个压力调整周期。考虑实验装置的气密性,一条完整测试实验数据须在14 d内完成,因为若测试时间过长(24 h),总实验周期将超出气密性时限,若时间过短(8 h),则操作人员需夜班操作,将增加人力成本。在此条件下,选取10、5、2、1 MPa/12 h压降速度,使其与现场压降速度相匹配,同时覆盖快速、中等与缓慢三类典型的压力下降情况,能较全面地反映压降速度对渗透率应力敏感特征的影响。实验温度控制在35 ℃,采用氮气进行实验,为了减小滑脱效应对实验的影响,实验过程中保持最小压力为2 MPa,平均压力大于5 MPa。
通过实验测得不同孔隙压降速度条件下岩心渗透率与孔隙压力的变化数据,分析岩心渗透率与孔隙压力关系可知(图4):煤岩基质样品初始气测渗透率介于(0.621 4~1.190 3)×10-3 µm2,随着孔隙压力的降低,煤岩基质渗透率大致呈指数式递减,并呈现出下降趋势先快后慢的变化特点。
对比不同孔隙压降速度和渗透率的变化发现(图5):当孔隙压降速度较快时(10、5 MPa/12 h),煤岩基质的渗透率下降幅度相对较快,而且渗透率下降幅度几乎没有平缓期;当孔隙压降速度较慢(2、1 MPa/12 h)时,深层煤岩基质渗透率下降幅度明显变小,而且存在明显的下降平缓期。将渗透率绝对值进行归一化处理,可以得到4块煤岩的归一化渗透率对孔隙压降速度的应力敏感响应关系。
对比同一岩心加载和卸载曲线,加载过程中煤岩的渗透率随孔隙压降速度的增加而显著降低,而卸载过程中,渗透率恢复较缓慢,未能恢复到初始值,且卸载曲线的下降幅度小于加载曲线,表现出明显的滞后效应。实验结果表明,不同岩心的加载和卸载曲线渗透率的变化幅度和响应速度也存在差异。
通过对不同岩心的压降速度和渗透率变化进行拟合分析发现(图6):孔隙压降速度与渗透率变化呈现指数关系,证实煤岩在不同加载速度时渗透率应力敏感程度存在差异化响应,且在一定范围内,压降速度的快慢直接影响到煤岩渗透率应力敏感的响应,为预测和优化煤岩气返排过程中的控压速度提供了重要的理论依据。
大量实验研究结果证实了由于煤岩的矿物组成与割理结构,在围压条件下,煤岩的塑性变形占比明显增加,在实际开采过程中,随着有效应力的不断增大,塑性变形逐渐占主导地位,使煤岩孔隙和裂隙结构发生显著变形(图7),煤岩的孔隙结构受到压缩,裂隙逐渐闭合,煤岩渗透率显著降低,从而导致渗透率对应力路径产生强烈滞后与不可逆性,表现出强塑性变形特征[29]。但从理论角度来看,煤岩渗透率对应力路径的敏感性通常是塑性变形,即加载-卸载会导致孔隙与裂隙结构发生不可逆变形;从多项实验与力学研究成果看,煤岩基质的整体变形在宏观尺度上多呈现弹性行为,宏观弹性响应掩盖了局部孔隙-裂隙系统可能出现的塑性屈服或不可逆闭合现象[30]。
塑性变形改变了煤岩的结构特征,使应变与应力路径之间的响应关系逐渐增强,渗透率对孔隙压降表现出更强的敏感性,这种敏感性体现在渗透率变化的快速响应上和煤岩在不同应力路径下的非线性响应特征。在高应力路径变化条件下,塑性变形主导了煤岩的形变过程,孔隙结构的不可逆压缩使渗透率对孔隙压降的响应更加迅速,下降幅度更大。
大宁—吉县区块位于鄂尔多斯盆地东缘[31-32],截至2025年6月,大宁—吉县区块已投产110余口井,核心生产区主力煤层为石炭系太原组8号煤层,埋深主要介于2 000~2 520 m,煤层平均厚度7.8 m,煤体结构以原生结构为主,平均镜质组反射率为2.7%,平均含气量为25.2 m3/t,割理较发育[33-34]。选用在2023年6月至2024年2月期间投产的20口井进行研究(保证压裂工艺与参数一致,地质区域特征基本一致),所有井采用多段多簇工艺,井距主要介于300~400 m,水平段长度介于1 000~1 700 m[35]。在实际生产中,为了减少由于压力过大导致的单井控制储量损失,需控制井内压降速度,从而提高气井稳产量和延长生产周期,避免由塑性变形引起的强应力敏感性问题[36-37]。通过研究在不同控压条件下的生产动态特征(图8),分析前期控压对后期生产情况的影响。
根据图8所示,不同控压条件下的生产动态表现出显著差异:初期不控压生产时,较高的初始配产导致套压下降速度较快(图8a),在生产后期表现出较低的稳产气量,稳产时间较短,而井的稳产套压越高,稳产气量越大。一些偏离整体线性趋势的异常点主要受压窜影响(图8b)。由研究结果可知:强应力敏感性会导致煤岩在高应力下发生不可逆的形变,进而加速渗透率的下降速率,导致井控储量的损失,控压生产在一定程度上能够减缓储层伤害,延长气井稳产期,提升气井产量和经济效益,为深层煤岩气的可持续开发提供重要保障。
由于实验观察问题与响应幅度问题,套压递减率取平均值,返排第一周的最大压降速度可达1.0~1.5 MPa/12 h,在一定程度上低估了初始实际压降速度。因此,目前实验测试过程中,压降速度仍比实际现场返排的压降速度快一个数量级,现有实验测试结果有可能高估煤岩渗透率应力敏感对应力路径的响应程度,下一步研究需针对实际压降情况进行实验压降数据调整,为现场应用提供支撑。
1)随着孔隙压力的降低,煤岩基质渗透率大致呈指数递减,初期渗透率降低较快,后期渗透率降低幅度逐渐减小,煤岩的基质渗透率不仅对孔隙压力变化敏感,还与孔隙压降速度有明确的响应关系。
2)煤岩基质渗透率对应力路径的响应特征主要源于塑性变形,塑性变形改变了煤岩的结构特征,使应变与应力路径之间的响应关系逐渐增强,并且随着压降速度的增加,煤岩的渗透率呈现指数关系变化。
3)在煤岩气开发过程中,压降速度过快时,深层煤岩基质和微裂缝系统发生蠕变变形,导致渗透率的变化更加显著。因此,深层煤岩气需要控压生产,避免强应力敏感性导致煤岩在高应力作用下发生不可逆的塑性变化。

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2026年第16卷第4期
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doi: 10.13809/j.cnki.cn32-1825/te.2025480
  • 接收时间:2025-12-17
  • 首发时间:2026-10-30
  • 出版时间:2026-07-26
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    1 西南石油大学石油与天然气工程学院,四川   成都 610500
    2 荆门中石油昆仑燃气有限公司,湖北   荆门 448000
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
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