气体钻井中钻柱失效试验研究.docx

石油机械

2012年第40卷第7期CHINAPETROLEUMMACHINERY—29—

钻井技术与装备?

气体钻井中钻柱失效试验研究

李东洋陈次昌王钱钱黄小兵吕东莉

(西南石油大学研究生部)

摘要：为了研究气体钻井中钻柱在冲蚀和振动工况下的力学性能，通过使用新研制的能模拟气体钻井钻柱同时受到振动及冲蚀情况的试验装置，进行了不同钻具组合情况下钻柱力学性能试验和钻柱冲蚀试验。试验结果表明，气体钻井过程中，钻柱所受交变应力波在由底部钻柱向上传播时有一定的衰减，但衰减程度不大，所以下段钻柱的应力值对上段钻柱的受力有较大影响；钻柱绕井简反转将增大钻柱所受的交变应力，且转速越高交变应力变化越大，从而加深钻柱损伤程度；钻柱冲蚀量随着注气量的增大而增大，但其增大是非线性的。

关键词：气体钻井；钻柱失效；钻具组合；多功能试验台；交变应力；冲蚀；振动

中图分类号：TE921文献标识码：A文章编号：1001-4578(2012)07-0029-05

AnExperimentalStudyofDrillstringFailureinGasDrilling

LiDongyangChenCichangWangQianqianHuangXiaobingLüDongli

(GraduateSchool,SouthwestPetroleumUniversity)

Abstract:Tostudythemechanicalpropertyofdrillstringingasdrillingundertheoperatingconditionsoferosionandvibration,thenewly-developedtestunitwhichcansimulatethedrilltringinvibrationanderosionatthesametimewasusedtoconductthemechanicalpropertytestanderosiontestofthedrillstringwithdifferentbottomholeas-semblies.Theexperimentalfindingsshowthatintheprocessofgasdrilling,thereisacertaindegreeofattenuationwhenthealternatestresswaveofthedrillstringtransmitsupwardfromthedrillstringbottombutthedegreeofattenua-tionisnotremarkable.Therefore,thestressvalueoflowerdrillstringhasremarkableeffectontheforceofupperdill-string.Thecounterrevolutionofdrillstringaroundthewellborewillincreasethealtermatestressofthedrillstring.Thehighertherotationspeed,thegreaterthealternatestresschanges.Asaresultthedamagetothedrllstringwillincrease.Thedrillstringerosionamountincreaseswiththeincreaseofsteaminjection,buttheincreasecurveisnotlinear.

Keywords:gasdrlling;drillstringfailure;bottomholeassembly;multifunctionaltestbed;alternatestress;erosion;vibration

0引言

气体钻井技术已在我国大规模推广应用，但气体钻井过程中钻柱失效频率非常高，