空气钻井过程中燃爆异常的录井监测探讨
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摘要
空气钻井作为一种新型钻井工艺,因其在提高机械钻速、保护油气层、防止井漏等方面的独特优势,近年来被石油钻井行业广泛应用。但由于空气钻井属于负压钻进,当钻遇油气层时,地层流体更容易进入井筒内,而地层产出的可燃性气体与空气混合后,极易在井底发生燃烧、爆炸异常,从而造成严重的灾害性事故。为了准确监测空气钻井中的燃爆异常,有效规避井下作业风险,以准噶尔盆地一口评价井在空气钻井过程中产生的燃爆异常为例,对录井资料(岩性、工程参数、气测数据等)进行分析,从录井角度加强对空气钻井条件下发生燃爆异常的认知,并提出了监测、控制燃爆异常发生的对策。
As a new drilling technology,air drilling has been widely used in petroleum drilling industry in recent years due to its unique advantages in improving penetration rate,protecting hydrocarbon reservoirs and preventing well leakage.However,because air drilling belongs to negative pressure drilling,when drilling hydrocarbon layers,formation fluid is easier to enter the wellbore.When the combustible gas produced by the formation is mixed with air,it is very easy to cause combustion and explosion anomaly at the bottom of the well,thus causing serious disastrous accidents.In order to accurately monitor the combustion and explosion anomaly in air drilling and effectively avoid downhole operation risk,the explosion anomalies caused by an appraisal well in Junggar Basin during air drilling was taken as an example,mud logging data(gas logging data,lithology,engineering parameters,etc.)were analyzed,the cognition of explosion anomaly under the condition of air drilling was enhanced from the point of mud logging.The comprehensive measures for monitoring and controlling the abnormal occurrence of combustion and explosion are put forward.
As a new drilling technology,air drilling has been widely used in petroleum drilling industry in recent years due to its unique advantages in improving penetration rate,protecting hydrocarbon reservoirs and preventing well leakage.However,because air drilling belongs to negative pressure drilling,when drilling hydrocarbon layers,formation fluid is easier to enter the wellbore.When the combustible gas produced by the formation is mixed with air,it is very easy to cause combustion and explosion anomaly at the bottom of the well,thus causing serious disastrous accidents.In order to accurately monitor the combustion and explosion anomaly in air drilling and effectively avoid downhole operation risk,the explosion anomalies caused by an appraisal well in Junggar Basin during air drilling was taken as an example,mud logging data(gas logging data,lithology,engineering parameters,etc.)were analyzed,the cognition of explosion anomaly under the condition of air drilling was enhanced from the point of mud logging.The comprehensive measures for monitoring and controlling the abnormal occurrence of combustion and explosion are put forward.
引文
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[3]张林,余代银,许期聪,等.空气钻井井下燃爆事例分析[J].天然气工业,2008,28(5):53-54.ZHANG Lin,YU Daiyin,XU Qicong,et al.Down hole explosion cases occurred during air drilling[J].Natural Gas Industry,2008,28(5):53-54.
[4]张瑞强.川东北工区元坝4井空气钻井录井成果及经验[J].西部探矿工程,2010,22(9):65-68.ZHANG Ruiqiang.Results and experience of air drilling in Yuanba wells 4in northeast Sichuan work area[J].West-China Exploration Engineering,2010,22(9):65-68.
[5]李铁成,刘东峰,胡建均,等.川东北地区空气钻井燃爆分析与预防[J].天然气工业,2009,29(5):78-81.LI Tiecheng,LIU Dongfeng,HU Jianjun,et al.Analysis and prevention of air drilling explosion in northeast Sichuan area[J].Natural Gas Industry,2009,29(5):78-81.
[6]高岩,武凤旺,梁占良.钻柱振动声波录井技术方法及应用实例[J].录井工程,2009,20(1):1-7.GAO Yan,WU Fengwang,LIANG Zhanliang.Drill string vibro-acoustic logging method and application examples[J].Mud Logging Engineering,2009,20(1):1-7.