煤储层改造背景下深部煤层气藏物质平衡方程的建立与应用  

Establishment and application of material balance equation for deep coalbed methane reservoirs based on coal formation stimulation background

作　　者：石军太[1,2] 徐凤银 曹运兴 李相方[1,2] 黄红星[5,7] 王凯 陈明[1,8] 张硕[1,2] 吉义天宇 王伟[9] 孙政 李靖 SHI Juntai;XU Fengyin;CAO Yunxing;LI Xiangfang;HUANG Hongxing;WANG Kai;CHEN Ming;ZHANG Shuo;JI Yitianyu;WANG Wei;SUN Zheng;LI Jing(State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum Beijing,Beijing 102249,China;Coalbed Methane Research Center,China University of Petroleum,Beijing 102249,China;College of Energy(College of Modern Shale Gas Industry),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;China United Coalbed Methane National Engineering Research Center Co.,Ltd.,Beijing 100095,China;Henan International Joint Laboratory for Unconventional Energy Geology and Development,Jiaozuo 454003,China;PetroChina Coalbed Methane Company Limited,Beijing 100028,China;Linfen Branch of PetroChina Coalbed Methane Company Limited,Taiyuan 030000,China;Exploration,Development and Construction Branch of PetroChina Coalbed Methane Company Limited,Linfen 041400,China;State Key Laboratory of Coal Fine Exploration and Intelligent Mining,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]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 [2]中国石油大学(北京)煤层气研究中心,北京102249 [3]成都理工大学能源学院(页岩气现代产业学院),四川成都610059 [4]成都理工大学油气藏地质及开发工程全国重点实验室,四川成都610059 [5]中联煤层气国家工程研究中心有限责任公司,北京100095 [6]河南省非常规能源与开发国际联合实验室,河南焦作454003 [7]中石油煤层气有限责任公司,北京100028 [8]中石油煤层气有限责任公司临汾分公司,山西太原030000 [9]中石油煤层气有限责任公司勘探开发建设分公司,山西临汾041400 [10]中国矿业大学煤炭精细勘探与智能开发全国重点实验室,江苏徐州221116

出　　处：《煤炭科学技术》2025年第3期200-217,共18页Coal Science and Technology

基　　金：国家自然科学基金重点资助项目(42230814);山西省科技重大专项资助项目(20201101002)。

摘　　要：近些年深部煤层气发展迅速,在多个深部煤层气区块都取得单井日产万方的突破,为了更加科学高效地开发深部煤层气,大幅提高煤层气的采收率,建立合理、可靠且考虑因素全面的煤层气物质平衡方程,并研究深部煤层气藏或气井控制储量、平均煤储层压力、不同类型气体产量占比、产能评价指标和最终可采储量具有重要的理论与现实意义。目前考虑游离气、煤基质收缩、溶解气、吸附气富集的微孔与游离气和水占据的介孔之间的压差和煤储层改造影响的煤层气物质平衡方程鲜有报道。首先基于深部煤层气藏物质平衡原理,在常规物质平衡方程考虑应力敏感引起的孔隙压缩、基质收缩、水的膨胀和产水因素的基础上,进一步考虑吸附气富集的微孔与游离气和水占据的介孔之间的压差、煤储层改造引起的煤储层物性参数变化和溶解气的影响,建立了基于煤储层改造背景下的深部煤层气藏物质平衡方程;然后提出了深部煤层气线性拟合的吸附气−游离气−溶解气储量评价方法、平均地层压力显式计算方法、吸附气−游离气−溶解气产量占比评价方法、深部煤层气井产能评价方法和最终可采储量EUR预测方法;最后对提出的方法进行了实例应用,评价了实例井控制的吸附气−游离气−溶解气储量,揭示了深部煤层气井生产过程中吸附气−游离气−溶解气产量占比变化规律,剖析了产能指标变化特征并预测了不同废弃压力下的EUR和煤层气采收率。研究表明:提出的深部煤层气储量评价方法,仅需实测2次以上的平均煤储层压力和对应的累计产气量和产水量数据,即可采用线性拟合的方法,评价出深部煤层气井吸附气−游离气−溶解气的储量;提出的深部煤层气平均地层压力计算方法为显式表达式,避免了隐式求解方法中复杂的计算机编程计算;提出的深部煤层气�In recent years,the deep coalbed methane was developed rapidly,with breakthroughs in daily production of tens of thousands of cubic meters per well in multiple deep coalbed methane blocks.In order to develop deep coalbed methane more scientifically and efficiently,significantly improve the recovery rate of coalbed methane,establishing a reasonable,reliable,and comprehensive coalbed methane material balance equation,and studying the controlled reserves,average coal reservoir pressure,proportion of different types of gas production,productivity evaluation indicators,and EUR of deep coalbed methane reservoirs or gas wells have important theoretical and practical significance.At present,there are few reports on the material balance equation of coalbed methane considering the presence of free gas,coal matrix shrinkage,the presence of dissolved gas,the pressure difference between micropores enriched with adsorption gas and mesopores occupied by free gas and water,and the impact of coal formation stimulation.Firstly,based on the principle of material balance in deep coalbed methane reservoirs,a material balance equation for deep coalbed methane reservoirs under formation stimulation background was established by further considering the pressure difference between micropores enriched with adsorption gas and mesopores occupied by free gas and water,changes in coal reservoir physical parameters caused by formation stimulation,and dissolved gas,except considering pore compression caused by stress sensitivity,matrix shrinkage,water expansion,and water production in conventional material balance equation of coalbed methane reservoir.Then,a linear fitting method for evaluating the reserves of adsorbed gas,free gas,and dissolved gas,an explicit calculation method for average formation pressure,an evaluation method for the production proportion of adsorbed gas,free gas,and dissolved gas,a productivity evaluation method for deep coalbed methane wells,and an EUR prediction method were proposed.Finally,the proposed methods were app

关 键 词：深部煤层气 物质平衡方程 游离气 储量评价 煤储层压力 产量占比 产能评价 最终可采储量EUR预测 

分 类 号：TD713[矿业工程—矿井通风与安全]