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时间:2020-05-20
《随钻双感应测井仪背景影响研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、石油管材与仪器·46·PETROLEUMTUBULARG00DS&DSTRUMENTS2015年6月·试验研究·随钻双感应测井仪背景影响研究仵杰叶雨白茹宝牒勇(1.西安石油大学光电油气测井与检测教育部重点实验室陕西西安710065;2.中国石油集团测井有限公司随钻测井中心陕西西安710054)摘要:分析随钻双感应测井仪背景影响对仪器研制具有重要的实际意义。本文通过COMSOL有限元软件数值计算分析背景参数(金属钻铤、反射层和磁芯)在不同地层电导率下对随钻双感应测井响应特性的影响,揭示了响应机理。当钻铤电导率大于10’s/m时,钻铤对深感应响
2、应的影响很小,对浅感应的影响不能忽略。钻铤长度变化对仪器的响应影响可以忽略。视电导率与钻铤半径近似线性关系。在地层电导率小于1S/m时,钻铤对深、浅感应的响应影响不大。反射层改变了钻铤对基值的非线性影响,随地层电导率增加,深感应的基值影响非线性减小,浅感应的非线性增加。深、浅感应的响应随着磁芯相对磁导率的增加非线性增加,相对磁导率在100至200之间时,对信号增强最明显。深、浅感应在磁芯实心与磁芯空心作用下的响应的比值约为固定值1.2。关键词:随钻双感应测井;金属钻铤;反射层;磁芯;COMSOL有限元软件中图法分类号:P631.43文献标识
3、码:A文章编号:2096—0077(2015)03—0046—05TheBackgroundInfluenceResearch0fLWDDual—inductionLoggingInstrumentWUJie’YEYuBAIRubaoDIEYong~(1.Xi~alzShiyouUniversity,KeyLaboratoryofEducationMinistryforPhotoelectricLoggingandDetection,Xi’an,Shaanxi710065,China;2.LWDLoggingCenter,ChinaPetr
4、oleumLoggingCO.LTD.,Xi’an,Shaanxi710054,China)Abstract:ThereisimportantpracticalsignificanceofanalysingthebackgroundinfluenceofLWDdual—inductionloggingtoo1.Inthisarti—cle,theinfluencesontheresponsefeatureofLWDdual—inductionloggingiscomputedandanalyzedusingCOMSOLsoftwarewhe
5、nthefor—mationconductivityischanged.Theeffectmechanismofmentaldrillcollarandhighpermeabilitymagneticcoreonthedua1.一inductionlog—gingwhiledrillingaterevealed.TheefectofdrillcollarconductivityOilthedeepinductionisalittlewhentheconductivityisgreaterthan10S/m,shallowinductionc
6、an’tbeignored.Theinfluenceofdrillcollarlengthontheresponsecanbene~eetedandtheapparenteonduc—tivityisapproximatelyproportionaltothedrillcollarradius.TheeffectofdrillcollaronthedeepandshallowinductionisalittlewhentheformationconductivityislessthanlS/m.reflectorhaschangedthen
7、onlinearinfluenceofdrillcollaronthebasevalue.Theinfluenceofthedeepinductionhasanonlineardecreasewiththeincreaseoftheformationconductivity.Buttheshallowinductionincreases.Theresponsesofthedeepandshallowinductionhaveanonlinearincreasewiththeincreaseoftherelativemagneticcorep
8、ermeability.Thesignalintensityisboostedobviouslywhentherelativemagneticcorepermeabilityis
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