简介：Decreasingtherisksandgeohazardsassociatedwithdrillingengineeringinhigh-temperaturehigh-pressure(HTHP)geologicsettingsbeginswiththeimplementationofpre-drillingpredictiontechniques(PPTs).ToimprovetheaccuracyofgeopressurepredictioninHTHPhydrocarbonreservoirsoffshoreHainanIsland,wemadeacomprehensivesummaryofcurrentPPTstoidentifyexistingproblemsandchallengesbyanalyzingtheglobaldistributionofHTHPhydrocarbonreservoirs,theresearchstatusofPPTs,andthegeologicsettinganditsHTHPformationmechanism.OurresearchresultsindicatethattheHTHPformationmechanisminthestudyareaiscausedbymultiplefactors,includingrapidloading,diapirintrusions,hydrocarbongeneration,andthethermalexpansionofporefluids.Duetothismulti-factorinteraction,acloudofHTHPhydrocarbonreservoirshasdevelopedintheYing-QiongBasin,butonlytraditionalPPTshavebeenimplemented,basedontheassumptionofconditionsthatdonotconformtotheactualgeologicenvironment,e.g.,Bellotti’slawandEaton’slaw.Inthispaper,wefocusontheseissues,identifysomechallengesandsolutions,andcallforfurtherPPTresearchtoaddressthedrawbacksofpreviousworksandmeetthechallengesassociatedwiththedeepwatertechnologygap.Inthisway,wehopetocontributetotheimprovedaccuracyofgeopressurepredictionpriortodrillingandprovidesupportforfutureHTHPdrillingoffshoreHainanIsland.

简介：Accordingtotheconsiderationoftheadvantageofdrilling,itisusuallyakindofprac-ticethathelpsstudentstoacquirefluencyinthelanguagebytrainingthemtoproducelan-guagepatternsautomaticallyandwithoutconsciouseffort.Butinrecentyears,thereisagreatandheatedarguementaboutdrillingactivities.

简介：在这篇论文，我们调查模仿围住的前进的非线性的动力学的与vibro影响的敲击的钻的一个低维的模型。在影响在钻期间引起的粘住滑倒产生的Non-holonomity没能正确地经由古典技术被鉴别。没有non-holonomity的一个减少的模型被一个新州的变量，平均技术成功地被采用检测周期的运动的介绍导出。本地分叉被使用C-L方法直接介绍。沿着参数的不同选择的数字模拟和渗透的率分析被执行了探查非线性的行为和钻的系统的最佳的渗透率。关键词分叉-混乱-Non-holonomity-敲击的钻工程被中国(10872136和10932006)和EPSRC资助(GR/R85556)的国家自然科学基础支持。

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简介：AbstractObjective:To evaluate the necessity and effectiveness of a preplanned technique for drilling during transcanal endoscopic ear surgery.Methods:Study design: Retrospective case series study from June 2011 to June 2015. Setting: Private tertiary care hospital. Patients: Eighty-five ears of 78 patients, age ranging from 9 to 57 years underwent transcanal endoscopic drilling for various types of pathology in their middle and external ear. Interventions: Application of a preplanned technique for transcanal drilling in endoscopic ear surgery that involved short timed drilling with use of intermittent irrigation and suction. Every events of the procedure were done one after another with the single hand of the surgeon. An attachment providing protecting sheath around rotating burr was used during each time of drilling. Main outcomes measure: Efficacy of such drilling technique in single handed endoscopic ear surgery. Presence of any postoperative thermal injury of facial nerve and any lacerated injury of skin of external ear.Results:This preplanned technique was found suitable for transcanal endoscopic drilling with the single hand of the surgeon. Postoperative facial nerve palsy or laceration of skin of external ear was not noted in any patient.Conclusion:After using the present technique, transcanal endoscopic drilling could be done easily and safely with single hand of the surgeon.

简介：DTH(down-the-hole)榔头钻的过程由于它的高非线性，大变丑和损坏行为作为很复杂的现象被描绘了。作为影响标本拿易碎的材料(水泥，花岗石和沙岩)，明确的时间集成非线性的有限元素代码LS-DYNA被采用，DTH的穿入边界条件锤打敲击的钻分析影响进程系统。与以前的研究相比，现在的模型包含几个新特征。一个人是钻系统的DTH榔头的3D效果被考虑。另一个重要特征是它带了易碎的材料的联合效果进报道去钻的系统的小点标本边界。这把它与传统的途径区分开来到小点岩石交叉，非线性的春天模型通常在被强加。影响力量，小点在DTH榔头影响下面插入穿入和水泥，花岗石和沙岩的力量穿入曲线被记录了；坑和破裂的形成也被调查了。影响大量活塞小点相互作用看起来相对敏感来回推动影响速度。在活塞小点相互作用之间的影响发生在twotimes更大的力量，而第一影响的持续时间不关于活塞速度变化。影响标本的材料性质不影响在活塞和位之间的第一影响进程。然而，在二影响之间的时期和第二影响力量的大小极大地取决于标本材料性质。标本的穿入深度依赖于影响力量大小和易碎的材料的宏机械的性质，这被发现。

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简介：ThemicrostructureofsynthesizedAT(A-luminumtitanate)hasbeenimprovedefficient-ly,AndthemicrocrackofATformedduringcoolingandabnormalgraingrowthhavebeenlimitd.Therefore,thesinterabilityandmechanicalpropertiesofATmaterialhavebeenenhanced.

简介：这份报纸为保留深海的钻的系统的车站的系统的评估探讨需要半能沉入水中。把半能沉入水中的配置基于选择的钻，系在的系统用不同系在线材料为水深度的一个范围被分析并且设计。这些是钢电线绳，聚酯绳和HMPE(高模量poly乙烯)。系在的分析在计算机软件包裹竖琴用先进充分联合的时间域分析方法被执行。衍射分析首先被使用包括钻的钻塔，系在的线和起床人解决容器的水动力学性质然后完全的动态系统的运动方程在时间领域被开发并且解决。使用先进分析方法，系在的系统的一个矩阵为用各种各样的系在材料在1000m，1500m，和2000m的水深度操作被开发。系在的系统的开发根据通常采用的绳索设计代码，APIRP2SK和APIRP2SM被进行。新鲜尝试然后被做比较地评估系在的系统特征和全球性能。有用结果以系在的材料被获得了，浇深度，并且给系在的配置的参数调音。结果在华南海环境为深海的系在系统的设计和操作提供深入的卓见。

简介：ThemaximuminternaltangentialstressisacriticalparameterforthedesignofthePDC(polycrystallinediamondcompact)diethathasbeenwidelyappliedtooffshoreoildrilling.Asimpleequationforthecalculationofthestressisproposed,andverifiedbythetestdatafromKingdreamCorp.ofChina,thelargestbitCompanyinChina.AnoptimummethodforthedesignofthePDCdieispresentedanddemonstratedindetail,andsoftwareforthedesignandFEManalysisofthedieisdevelopedonthebasisofthemethod.Thissoftwarehasbeenusedinoilindustryinrecentyears.

简介：钻洞的方法是为测量剩余压力的最著名的方法之一。在一个标本识别未知飞机压力，一个圆形的洞首先在飞机应力下面在无限的板中被钻，然后，源于钻的洞的紧张被测量。紧张可以从在洞附近解释Moiré签名被获得。在穿过的栅栏Moiréinterferometry，水平、垂直的排水量地(u和v)能被获得到确定二块紧张地和一砍紧张地。在这篇论文，借助于Moiréinterferometry和作者开发的三个方向栅栏(栅栏插座)，三排水量回答(u，v和s)被获得获得三块紧张地。作为一个实际应用程序，钻方法的洞被采用为增强的铝和纤维测量消除紧张合成。它是一一步一步地方法；在各个走一个单身者把压成薄片或相等的深度被钻发现在钻的深度和在纤维减轻的剩余紧张之间的一些关系增强合成材料。

简介：Tomaintaingashydratestability,low-temperaturedrillingfluidsandhighdrillingspeedsshouldbeusedwhiledrillingingashydrate-bearingsediments.Theeffectofthedrillingfluidondownholerocksurfacesatlowtemperaturesisveryimportanttoincreasethedrillingrate.Thispaperanalyzedtheactionmechanismofthedrillingfluidondownholerocksurfacesandestablishedacorrespondingevaluationmethod.Thesofteningeffectofsixsimulateddrillingfluidswith0.1wt.%offourcommonsurfactantsandtwocommonorganicsaltsonthedownholerocksurfacestrengthwasevaluatedexperimentallyusingtheestablishedmethodatlowtemperature.Theexperimentalresultsshowedthatthesurfactantsandorganicsaltsusedinthedrillingfluidsaidedinthereductionofthestrengthofthedownholerocksurface,andtheestablishedevaluationmethodwasabletoquantitativelyrevealthedifferenceinthesofteningeffectofthedifferentdrillingfluidsthroughcomparisonwithwater.Inparticular,themostcommonsurfactantthatisusedindrillingfluids,sodiumdodecylsulfate(SDS),hadaverygoodsofteningeffectwhiledrillingunderlow-temperatureconditions,whichcanbewidelyappliedduringdrillinginlow-temperatureformations,suchasnaturalgashydrate-bearingsediments,thedeepseafloorandpermafrost.

简介：SongkeWellNo.2,oneofthemainpartofthescientificdrillingprojectinSongliaoBasin,whichwasdrilled7018mandacquiredthepartofcorescontinuouslyfromtheLowCretaceoustotheCarboniferousandthePermianfromthe2843mdeep,canbeconsideredasthedeepestcontinentaldrillingprojectinAsia.Aimingatthefeaturesoflongerwellsections,largerdiametersandmultiplespud-insforcoringofSongkeWellNo.2,thisprojectbrokethroughthe"coringinsmalldiameterandreaminginlargediameter"spud-indrilling-completionprocedureswhicharealwaysusedinlarge-diameter-wellcoringforcontinentalscientificdrillingprojectsindomesticandoverseasandthedrillingmethodofshort-singlecylinderroundtripfootage.Atthesametime,"coringinthesamediameterandcompletingdrillingatonesinglediameter"wasachievedatallφ311mmandφ216mmcoringsectionsofmorethanonethousandmeterslong,high-efficientoperationwith"drillinglongfootagewithdrilltoolscombinedinmulticylinders"wasachievedatdeepcoringsection.Fourworlddrillingrecordswerecreatedwhichincludemorethanathousandmeterscontinuouscoringatφ311mm,andthefootageperroundtripfootageatφ311mm,φ216mmandφ152mmisallmorethan30m,allofthesebreakthroughsreducedatleast300daysforthisproject;moreover,consideringthecharacteristicsofformationsthatthegeothermalgradientishighinthedrilledsectionsandtheinside-welltemperatureisover240℃afterdrillingcompletion,aformate-polymerwater-basedmudsystemwasdevelopedbycompoundingattapulgiteandsodiumbentoniteandbyaddingindependentlydevelopedhigh-temperaturestabilizer,whichcanprovidecriticaltechnicalsupportforsuccessfulwellcompletionat7018minthesuper-high-temperatureenvironmentItisthefirsttimethatthewater-basedmudisoperatedattheworkingtemperaturehigherthan240℃inChina;Besides,consideringthehigh-qualityrequirementoncoresimposedbytheproject,themethod"mechanicalcor

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简介：Deepwatersedimentsarepronetolosscirculationindrillingduetoalowoverburdengradient.Howtopredictthemagnitudeofleak-offpressuremoreaccuratelyisanimportantissueintheprotectionofdrillingsafetyandthereductionofdrillingcostindeepwater.Startingfromthemechanicalpropertiesofashallowformationandbasedonthebasictheoryofrock-soilmechanics,thestressdistributionaroundaboreholewasanalyzed.Itwasfoundthattherockorsoilonaboreholeisintheplasticyieldstatebeforetheeffectivetensilestressisgenerated,andtheeffectivetangentialandverticalstressesincreaseasthedrillingfluiddensityincreases;thus,tensilefailurewillnotoccurontheboreholewall.Basedontheresultsofstresscalculation,twomechanismsandleak-offpressurepredictionmodelsforshallowsedimentsindeepwaterdrillingwereputforward,andthecalculatedvaluesofthesemodelswerecomparedwiththemeasuredvalueofshallowleak-offpressureinactualdrilling.TheresultsshowthattheMHPS(minimumhorizontalprinciplestress)modelandtheFIF(fracturinginformation)modelcanpredictthelowerandupperlimitsofleak-offpressure.ThePLC(permeablelostcirculation)modelcancomprehensivelyanalyzethefactorsinfluencingpermeableleakageandprovideatheoreticalbasisforleak-offpreventionandpluggingindeepwaterdrilling.

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简介：独角兽是西方神话传说中的一种虚构生物。形如白马，额前有一个螺旋角，代表稀有、高贵、高傲和纯洁。如今,这个西方世界的神兽，已经成为最具创新能力的成功食业的图腾.它能够在极短时间内，凭借自己独有的基因，率先深入挖掘新经济中的巨大机遇.