煤层气井产量变化规律及产能预测

国内图分类号：TE256.9国际图书分书类号.：622工学硕士学位论文煤层气井产量变化规律及产能预测硕士研究生导师申请学位级别学科、专业所在单位授予学位单位：：：：：：康园园邵先杰教授工学硕士油气田开发工程车辆与能源学院燕山大学ClassifiedIndex:TE256.9U.D.C.:622DissertationfortheMasterDegreeinEngineeringVARIATIONLAWOFPRODUCTIVITYRATEANDPRODUCTIVITYPREDICTIONOFCBMWELLCandidate:Supervisor:AcademicDegreeAppliedfor:Speciality:University:KangYuanyuanProf.ShaoXianjieMasterofEngineeringOil-GasFieldDevelopmentEngineeringYanshanUniversity燕山大学硕士学位论文原创性声明由本人郑重声明：此处所提交的硕士学位论文《煤层气井产量变化规律及产能预测》，是本人在导师指导下，在燕山大学攻读硕士学位期间独立进行研究工作所取得的成果。据本人所知，论文中除已注明部分外不包含他人已发表或撰写过的研究成果。对本文的研究工作做出重要贡献的个人和集体，均已在文中以明确方式注明。本声明的法律结果将完全由本人承担。作者签字日期：年月日燕山大学硕士学位论文使用授权书《煤层气井产量变化规律及产能预测》系本人在燕山大学攻读硕士学位期间在导师指导下完成的硕士学位论文。本论文的研究成果归燕山大学所有，本人如需发表将署名燕山大学为第一完成单位及相关人员。本人完全了解燕山大学关于保存、使用学位论文的规定，同意学校保留并向有关部门送交论文的复印件和电子版本，允许论文被查阅和借阅。本人授权燕山大学，可以采用影印、缩印或其他复制手段保存论文，可以公布论文的全部或部分内容。保密□，在年解密后适用本授权书。本学位论文属于不保密□。(请在以上相应方框内打“√”)作者签名：日期：年月日导师签名：日期：年月日摘要Ⅰ摘要本文在调研大量相关文献基础上，分析了煤层气的赋存规律、解吸规律和渗流特征。通过对韩城和晋城两个矿区的实际资料分析认为，由于两个矿区的地质条件不同，所以呈现出不同的生产特征。韩城矿区煤层气井的生产特征表现为：产水量大，排水期长；单井产量差别大；提液产气；稳产时间长；产量波动大；低产期持续时间长；峰值期不明显。晋城矿区煤层气井的生产特征表现为：排水量达到峰值后，就开始产气；不同井稳产期持续时间差异大；递减期持续时间长，递减平缓，大部分产量是在递减期获得；二次措施后增产效果明显，并延长了油井生产寿命。根据煤层气井产量递减规律分析结果，研究区大部分井表现为指数递减，个别井表现为调和递减和双曲线递减，而且不同井的递减率差异比较大。结合实际数据分析了影响煤层气井的各个因素，包括煤储层厚度、煤储层物性、水文地质条件、多层合采、层间干扰和排采技术等。根据实际生产井资料，建立了中国煤层气井生产模式。从解吸、渗流平衡的机理出发，建立了合理地层压力水平的模型，优化出了合理的地层压力，分析了峰值产量形成的条件。依据线性回归方法、翁氏模型、灰色系统以及月产累产之比递减分析法对实际生产井进行了产量预测。结果表明线性回归方法、翁氏模型预测法、灰色系统预测法和月产累产之比递减分析法的预测数据与实际生产数据相关性较好，各种方法所得的平均误差率分别为3.65%、10.8%、1.39%、和9.108%，不同方法适合于不同生产阶段的井。关键词煤层气；生产特征；产量预测；线性回归方法；生产模式；灰色系统燕山大学工学硕士学位论文IIAbstractByanalysisingtheactualdataofHanchengandJincheng,becauseofdifferentgeologicalconditionsofthetwomines,therearedifferentproductioncharacteristicsinthetwomines.ThecharacteristicsofCBMwellsinHanchengareproducingalargeamountofwaterandlongdrainage.Perwellproductionisdifferent.Thestabletimeislong,alsoislowyieldtime.Thepeaktimeisnotclear.ThecharacteristicsofCBMwellsinHanchengaregasproductingafterdrainagepeak.Thedurationofstabletimeofdifferentwellsaredifferent.Thedeclinetimeislong,anddecreasingisflat.Mostoftheoutputisinthereducedperiod.Yieldincreasedaftersecondarymeasures,andproductivelifeofCBMwellsareextend.ProductiondeclinelawofCBMwellsarestresslyanalysed.Mostwellsareexponentialdecline,afewwellsareharmonicdeclineandhyperbolicdecline.DeclinerateofdifferentwellsareverydifferentTherearedifferentproductioncharacteristicsindifferentwells,whicharecontrolledbygeologicfactoranddrainagetechniques.WithdynamicanalysisofCBMwell,threeproductionmodelsareclassified.Basedontheequilibriummechanismofdesorptionandflow,areasonablelevelofformationpressuremodelisestablished,whichoptimizesreasonableformationpressureandanalysicsoftheformationconditionsofpeakproduction.Linearregression、Weng'smodel、graysystemGM(1,1)modelandmonthlyproduction/cumulativeproductionarerespectivelyusedtocalculatetheproductivityrateofCBMwells.ItturnsoutthatforecastdatabyLinearregression、Weng'smodelprediction、graysystemGM(1,1)Modelandmonthlyproduction/cumulativeproductioniswellinterrelatedtoactualproductiondata.Theaverageerrorrateofeverymodelare3.65%、10.8%、1.39%and9.108%.Differentmethodsarefitdifferentstagesofproductionwells.KeywordsCoalbedmethane;Productioncharacteristics;yieldforecasting;AbstractIIILinearregression;Productionmodel;graysystem燕山大学工学硕士学位论文IV目录V目录摘要·················································································································IAbstract·············································································································II第1章绪论·······································································································11.1引言·········································································································11.2国内外研究现状·····················································································11.2.1体积计算法························································································21.2.2产量递减分析法················································································31.2.3物质平衡法························································································31.2.4数值模拟法························································································41.3问题的提出及研究意义··········································································51.4课题来源及本文的研究内容··································································6第2章煤层气的储层特征和储集、运移以及产出机理································72.1煤层气的储层特征·················································································72.1.1煤的孔隙类型····················································································72.1.2煤的孔隙系统····················································································72.1.3煤层的渗透性····················································································82.1.4煤的内表面积····················································································92.2煤层气的赋存机理····························································