溢流环空压力峰值确定套管下深方法
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摘要
目前套管下深设计主要考虑关井压力,但实际压井过程中,循环排气时的环空压力峰值高于关井时的环空压力。为保证溢流井控全过程不压漏地层以及减少地层压力不确定性对井控风险的影响,通过计算循环压井将溢流物循环排出井筒过程中环空压力变化,计算出环空压力峰值,建立其随溢流强度变化的图版,并提出根据溢流环空压力峰值对比地层破裂压力确定套管下入深度的方法。结合油田实例计算证明:该方法能够明确套管下深可应对的井涌强度,使地层压力不确定性可控,实现了套管下深精细设计。
At present,shut-in pressure is the main factor that is taken into consideration when the casing setting depth is designed.In the actual process of well killing,however,the peak annulus pressure during the circulating out of the gas is higher than the annulus pressure during well shut-in.To prevent circulation loss in the whole process of overflow well control and reduce the effect of formation pressure uncertainty on well control risk,the peak annulus pressure was calculated by calculating the change of annulus pressure during the circulating of the overflow materials out of the borehole by means of circulative well killing,and the chart for the variation of peak annulus pressure with the overflow strength was established.Besides,it was proposed to determine the casing setting depth according to the peak overflow annulus pressure,combined with the formation fracture pressure.It is proved from the case calculation of an oilfield that this method can define the kick strength corresponding to the casing setting depth,and thus the uncertainty of formation pressure is the controllable and the casing setting depth is designed precisely.
At present,shut-in pressure is the main factor that is taken into consideration when the casing setting depth is designed.In the actual process of well killing,however,the peak annulus pressure during the circulating out of the gas is higher than the annulus pressure during well shut-in.To prevent circulation loss in the whole process of overflow well control and reduce the effect of formation pressure uncertainty on well control risk,the peak annulus pressure was calculated by calculating the change of annulus pressure during the circulating of the overflow materials out of the borehole by means of circulative well killing,and the chart for the variation of peak annulus pressure with the overflow strength was established.Besides,it was proposed to determine the casing setting depth according to the peak overflow annulus pressure,combined with the formation fracture pressure.It is proved from the case calculation of an oilfield that this method can define the kick strength corresponding to the casing setting depth,and thus the uncertainty of formation pressure is the controllable and the casing setting depth is designed precisely.
引文
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[14]任美鹏,李相方,刘书杰,王元娇.钻井井喷关井期间井筒压力变化特征[J]中国石油大学学报(自然科学版),2015,39(3):113-119.REN Meipeng,LI Xiangfang,LIU Shujie,WANG Yuanjiao.Characteristics of wellbore pressure change during shut in after blowout[J].Journal of China University of Petroleum,2015,39(3):113-119.
[15]何英明,刘书杰,耿亚楠,谢仁军,任美鹏,夏强.莺歌海盆地高温高压水平井井控影响因素[J].石油钻采工艺,2016,38(6):771-775.HE Yingming,LIU Shujie,GENG Ya’nan,XIE Renjun,REN Meipeng,XIA Qiang.Factors influencing the well control of HTHP horizontal wells in the Yingehai Basin[J].Oil Drilling&Production Technology,2016,38(6):771-775.
[16]袁波,刘刚,王果.压井施工的精细计算[J].断块油气田,2006,13(6):65-68.YUAN Bo,LIU Gang,WANG Guo.Exactcalculation of kill Job[J].Fault-Blockoil&Gas Field,2006,13(6):65-68.
[17]张艳,翟晓鹏.深水钻井司钻法压井过程中立管压力和地层受力变化规律[J].石油钻采工艺,2015,37(5):14-16,21.ZHANG Yan,ZHAI Xiaopeng.Change law of standpipe pressure and formation stressduring well killing by driller method in deep water drilling[J].Oil Drilling&Production Technology,2015,37(5):14-16,21.
[2]李琪,徐英卓.钻井事故灾难应急信息共享与决策指挥系统研究[J].石油钻采工艺,2012,34(5):102-106.LI Qi,XU Yingzhuo.Research on information sharing and decision making systemfor drilling accident emergency[J].Oil Drilling&Production Technology,2012,34(5):102-106.
[3]魏超南,陈国明.“深水地平线”钻井平台井喷事故剖析与对策探讨[J].钻采工艺,2012,35(5):18-21.WEI Chaonan,CHEN Guoming.Analysisandprecaution of the blow-out on deep horizon rig[J].Drilling&Production Technology,2012,35(5):18-21.
[4]王延恒.楚29井气侵溢流的分析与处理[J].钻采工艺,1995,17(3):22-27.WANG Yanheng.Analysis and treating of gas overflow in Chu29 well[J].Oil Drilling&Production Technology,1995,17(3):22-27.
[5]赵金洲,李真祥.毛坝1井钻井井控实践[J].天然气工业,2003,23(5):44-47.ZHAO Jinzhou,LIZhenxiang.Practice of well control in drilling well Moba-1[J].Natural Gas Industry,2003,23(5):44-47.
[6]高德利,覃成锦,李文勇.南海西江大位移井井身结构与套管柱设计研究[J].石油钻采工艺,2003,25(4):1-4.GAO Deli,TAN Chengjin,LI Wenyong.Designs of well structure and casing strings for Xijiang extended reach wells in South-China sea[J].Oil Drilling&Production Technology,2003,25(4):1-4.
[7]刘天科.胜利油田老区调整井钻井井控技术[J].石油钻采工艺,2011,33(3):9-11,16.LIU Tianke.Applicationof well control technology on adjustment wells[J].Oil Drilling&Production Technology,2011,33(3):9-11,16.
[8]郝俊芳.如何计算井涌余量[J].西南石油学院院报,1983,5(3):45-50.HAO Junfang.How to calculate kick tolerance[J].Journal of Southwest Petroleum Institute,1983,5(3):45-50.
[9]郝俊芳.司钻法压井过程中套压及地层受力变化规律与计算方法[J].石油钻采工艺,1983,5(2):9-13.HAO Junfang.Change law and method to calculateof standpipe pressure and formation stressduring well killing by driller method[J].Oil Drilling&Production Technology,1983,5(2):9-13.
[10]郝俊芳.井控过程中防止井漏的若干理论问题[J].石油钻采工艺,1984,6(3):1-6.HAO Junfang.Some theoretical problems of preventing well leakage in well control process[J].Oil Drilling&Production Technology,1984,6(3):1-6.
[11]曾明昌,高自力,郑述全,毛建华.气井最高允许关井压力确定及钻井现场几个井控问题研究关[J].天然气工业,2005,25(11):45-47.ZENG Mingchang,GAO Zili,ZHENG Shuquang,MAO Jianhua.Highest shut-in pressure allowed by gas well and some well control problems in drilling site[J].Natural Gas Industry,2005,25(11):45-47.
[12]刘凯.如何认识和计算井涌余量[J].西南石油学院学报,1990,12(1):37-45.LIU Kai.How to recognize and calculate kick tolerance[J].Journal of Southwestern Petroleum Institute,1990,12(1):37-45.
[13]郝希宁,苏峰,蒋世全.南海深水钻井井涌余量主控因素分析[J]石油钻采工艺,2015,37(1):60-63.HAO Xining,SU Feng,JIANG Shiquan.Main control factors of kick tolerance for deepwater drilling in South China Sea[J].Oil Drilling&Production Technology,2015,37(1):60-63.
[14]任美鹏,李相方,刘书杰,王元娇.钻井井喷关井期间井筒压力变化特征[J]中国石油大学学报(自然科学版),2015,39(3):113-119.REN Meipeng,LI Xiangfang,LIU Shujie,WANG Yuanjiao.Characteristics of wellbore pressure change during shut in after blowout[J].Journal of China University of Petroleum,2015,39(3):113-119.
[15]何英明,刘书杰,耿亚楠,谢仁军,任美鹏,夏强.莺歌海盆地高温高压水平井井控影响因素[J].石油钻采工艺,2016,38(6):771-775.HE Yingming,LIU Shujie,GENG Ya’nan,XIE Renjun,REN Meipeng,XIA Qiang.Factors influencing the well control of HTHP horizontal wells in the Yingehai Basin[J].Oil Drilling&Production Technology,2016,38(6):771-775.
[16]袁波,刘刚,王果.压井施工的精细计算[J].断块油气田,2006,13(6):65-68.YUAN Bo,LIU Gang,WANG Guo.Exactcalculation of kill Job[J].Fault-Blockoil&Gas Field,2006,13(6):65-68.
[17]张艳,翟晓鹏.深水钻井司钻法压井过程中立管压力和地层受力变化规律[J].石油钻采工艺,2015,37(5):14-16,21.ZHANG Yan,ZHAI Xiaopeng.Change law of standpipe pressure and formation stressduring well killing by driller method in deep water drilling[J].Oil Drilling&Production Technology,2015,37(5):14-16,21.