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1、第31卷第5期石油钻采工艺Vol.31No.52009年10月OILDRILLING&PRODUCTIONTECHNOLOGYOct.2009文章编号:1000–7393(2009)05–0015–04岩石力学参数试验与地层破裂压力预测研究111,2111李敏练章华陈世春魏臣兴林铁军李孝军(1.西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500;2.渤海钻探塔里木钻井工程公司,新疆库尔勒841000)摘要:通过对塔里木盆地群库恰克地区4口井中的7个地层100块岩心进行岩石力学参数试验和声波试验,获得了该地区岩石的弹性模
2、量、泊松比、纵横波时差等一系列岩石静态力学参数。对试验结果进行了分析研究,得到了岩石纵横波时差关系拟合模型。结合测井资料所得到的岩石动态力学参数,回归出了群库恰克地区岩石的动静态力学参数模型,为预测群库恰克地区地层破裂压力提供了准确的岩石力学参数。在建立群库恰克地区地层破裂压力预测模型过程中,基于岩石的破裂机理,提出了一种地层破裂压力预测的新模型,该新模型已用于群库恰克地区地层破裂压力预测,为合理确定钻井液密度提供了理论依据。关键词:三轴试验;泊松比;动静态力学参数;声波时差;破裂压力中图分类号:TU453文献标识码:ARockmech
3、anicalparametricexperimentsandtheresearchofformationfracturepressureprediction111,2111LIMin,LIANZhanghua,CHENShichun,WEIChenxing,LINTiejun,LIXiaojun(1.SouthwestPetroleumUniversityofOilandGasReservoirGeologyandDevelopmentEngineering,StateKeyLaboratory,Chengdu610500,China;
4、2.TarimDrillingEngineeringCompanyofBohaiDrillingEngineeringCo.,Korla841000,China)Abstract:Theelasticmodulus,Poissonratio,S-Pintervalandotherstaticrockmechanicalparameterswereobtainedthroughtherockmechanicalparametricexperimentsandacousticexperimentsofthe100drillingcoresf
5、rom7layersand4wellsinQunkuqiakeBlockofTarimBasin.ThematchingmodelofrockS-Pintervalrelationshipcanbederivedfromtheresultsoftheexperiments.Combinewiththestaticrockmechanicalparametersobtainedfromloggingdata,thestaticrockmechanicalparametricmodeloftheQunkuqiakeBlockcanbeder
6、ived.ThisprovidesaccuraterockmechanicalparametersforformationfracturepressurepredictioninQunkuqiakeBlock.WhenbuilduptheforecastmodeloftheformationfracturepressureinQunkuqiankeBlock,anewmodelwasdevelopedforfor-mationfracturepressurepredictiononbaseofthefracturingmechanism
7、.ThisnewmodelhasalreadybeenusedontheformationfracturepressurepredictioninQunkuqiakeBlock,anditprovidestheoreticalcriterionfortheproperselectionofdrillingfluiddensity.Keywords:tri-axialtest;poissonratio;dynamicandstaticmechanicalparameters;acoustictraveltime;fracturepress
8、ure准确地预测地层破裂压力,有助于合理确定钻井界,北靠柯坪台隆,西南为齐姆根凸起及咯什、叶城凹液密度与井身结构,保证钻井安全,在石油工程中具陷。该区块钻井目的层较深,一般在5000m以上,地[1-5]有十