延缓大庆油田标准层套损的套管优选.pdf

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1、第43卷第6期石油钻探技术Vo1．43No．62O15年11月PETROLEUMDRILLINGTECHNIQUESNOV．。2O15钻井完井doi：10．11911／syztjs．201506002延缓大庆油田标准层套损的套管优选艾池，胡超洋，崔月明(东北石油大学石油工程学院，黑龙江大庆163318)摘要：大庆油田部分区域集中出现标准层套管剪切损坏，虽已采用标准层不固井工艺延缓套管损坏，但除此之外，套管壁厚、钢级等参数对标准层套管剪切损坏的临界条件也有影响。为此，考虑套管和地层弹塑性力学特征，针对标准层不固井的工程条件，应用考

2、虑大变形后应力平衡状态的拉格朗日格式有限元方程，提出了地层整体移动剪切套管过程的三维有限元计算方法。考虑套管变形和套管断裂的2种失效条件，计算并对比不同壁厚和钢级套管失效的临界值。结果表明：考虑套管断裂的地层剪切套管临界滑移量明显小于考虑套管变形的临界滑移量；同规格、同钢级套管损坏的临界滑移量随套管壁厚增大呈线性减小，随其延伸率增大近似呈线性增大。因此，在满足强度校核的前提下，大庆油田标准层宜采用低钢级小壁厚套管以延缓套管损坏。关键词：标准层套管损坏有限元法几何模型大庆油田中图分类号：TE358文献标志码：A文章编号：1001—

3、0890(2015)06—0007—06CasingOptimizationforDelayingCasingDamageintheDatumBedoftheDaqingOilfieldAiChi，HuChaoyang，CuiYueming(CollegeofPetroleumEngineering。NortheastPetroleumUniversity，Daqing，Heilongjiang，163318，China)Abstract：Casingsheardamageappearedfrequentlyinthedatum

4、bedintheDaqingOilfield，andanun—cementingtechnologyhasbeenadoptedtodelaycasingdamage．However，thecritica1valueofmarkercas—ingsheardamageisrelatedtowallthicknessandsteelgradeofthecasing．Ananalysiswasconductedontheelastoplasticmechanicalcharacteristicsofcasingsandformati

5、ons，andathree-dimensionalfiniteele—mentcalculationmethodwasproposed，basedontheengineeringconditionsofuncementingmarkers，forintegralformationmovementandshearingcasingbyusingtheLagrangefiniteelementequation，whichtakesaccountofthestressequilibriumstateafterlargedeformat

6、ion．Criticalvaluesofthecasingfailurewithdifferentwallthicknessandsteelgradewerecalculatedandcomparedattwofailureconditions，i．e．thecasingdeformationandcasingfracturing．ItisshownthatthecriticalslippageofcasingwithformationshearwhenthecasingWasfracturingismuchsmallertha

7、nthatofcasingdeformation．Thecritica1slippageofcasingthathavethesamesizeandsteelgradedecreaseslinearlywiththeincreaseofwallthickness，butincreaseslinearlywiththeincreaseofelongationrate．Tosumup，thecasingwithsmallwallthicknessandlowsteelgradeshouldbeadoptedindatumbedoft

8、heDaqingOilfieldtodelaycasingdamageonthecondi—tionthatstrengthchecksaresatisfied．Keywords：datumbed；casingdamage；finiteelementmethod