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时间:2019-03-06
《油井水力压裂摩阻计算和井口压力预测》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第29卷增1岩石力学与工程学报Vol.29Supp.12010年5月ChineseJournalofRockMechanicsandEngineeringMay,2010油井水力压裂摩阻计算和井口压力预测1,213111刘合,张广明,张劲,彪仿俊,吴恒安,王秀喜(1.中国科学技术大学近代力学系,安徽合肥230026;2.中国石油勘探开发研究院,北京100083;3.中国石油大学石油和天然气工程学院,北京102200)摘要:对水力压裂过程中射孔孔眼摩阻和管柱沿程摩阻计算方法进行分析。列出射孔孔眼摩阻计算公式并讨论其中的各个影响因素,给出压裂液密度和孔眼流量系数的计
2、算公式,提出新的孔眼直径计算公式。基于大庆油田的施工数据,建议一种修正的降阻比计算公式,能够得到更为准确的管柱沿程摩阻历程曲线。通过有限元软件ABAQUS对大庆油田肇15–平56井2150.0~2160.0m井段分段压裂过程进行数值模拟,模拟得到的井底压力、井口压力曲线与现场施工曲线吻合良好,验证计算模型和管柱沿程摩阻计算公式的正确性。对大庆油田南214–平324井限流压裂过程进行数值模拟,模拟得到的压裂作业曲线和现场施工曲线吻合良好,验证射孔孔眼摩阻计算公式的正确性。关键词:岩石力学;油井;水力压裂;射孔孔眼摩阻;管柱沿程摩阻;有限元;数值模拟中图分类号:TU
3、45文献标识码:A文章编号:1000–6915(2010)增1–2833–07FRICTIONLOSSCALCULATIONANDSURFACEPRESSUREPREDICTIONINOILWELLHYDRAULICFRACTURING1,213111LIUHe,ZHANGGuangming,ZHANGJin,BIAOFangjun,WUHengan,WANGXiuxi(1.DepartmentofModernMechanics,UniversityofScienceandTechnologyofChina,Hefei,Anhui230026,China;2.
4、ResearchInstituteofPetroleumExplorationandDevelopment,PetroChina,100083,China;3.SchoolofPetroleumandGasEngineering,ChinaUniversityofPetroleum,Beijing102200,China)Abstract:Themethodsofcalculatingthepipestringfrictionandtheperforationfrictionareanalyzed.Perforationfrictionandpipestring
5、frictionareanalyzedandfurtherthesurfacepressureispredictedintheprocessofhydraulicfracturing.Theformulaofperforationfrictionispresentedandthecorrelativefactorsarediscussed.Theformulaeoffracturingfluiddensityandperforationdischargecoefficientareobtained,andtheformulaofperforationdiamet
6、erismodified.TheformulaofdragratioismodifiedbasedonthemeasureddatainDaqingOilfield,andfurthermorethetreatmenthistoryofpipestringfrictioncouldbeobtainedbyuseofdragratiomethod.Thestagedfracturingprocessesofwellinterval2150.0–2160.0mofwellZhao15–Ping56inDaqingOilfieldaresimulatedbyfinit
7、eelementsoftwareABAQUS.Theevolutionofbottomholepressureandsurfacepressureobtainedfromsimulationareingoodcoincidencewithcorrespondingfieldmeasurementdata,whichverifiesthecorrectnessofthesimulationmodelandtheproposedformulaofpipestringfriction.ThelimitedentryfracturingprocessofwellNan2
8、14–Ping324in
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