海上TCP射孔反循环压井计算分析与应用
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摘要
在海上油管输送射孔(TCP)作业中,射孔后多采用反循环压井法,主要特点为迟到时间短,可为后期压井赢得宝贵的时间,地层流体不污染套管环空,可保持井筒干净。针对海上射孔管柱的特点,根据不同的作业情况推导出溢流物及压井液密度计算式,并进一步推导出压井过程中的关井压力和循环压力的计算公式,通过反循环压井实例进行了计算。结果表明:套压在开始时最高,溢流全部进入钻具后由初始循环套压下降至稳定循环套压,并在溢流上升及排出钻具过程中保持不变;压井液进入环空到达负压阀时,套压下降至终了循环套压,并在压井液上升及排出井口过程中保持不变。
Reverse circulation well killing method is commonly used in offshore tubing conveyed perforating(TCP).With this method,the lag time is short,so that the time for killing well can be saved;the formation fluid does not pollute the casing annulus,so that the wellbore can be kept clean.According to the characteristics of offshore perforating string,we deduce the formula for calculating the densities of overflow and well killing fluid,as well as the calculation formula of shut-in pressure and circulating pressure in the well killing process.Calculation is carried out for a reverse circulation killing example.The results show that the casing pressure is the highest at the beginning,and after the overflow all goes into the drilling tool,the initial circulating pressure is lowered to the stable circulating pressure.When the well killing fluid enters the annular vacuum and reaches the negative pressure valve,the casing pressure drops to the terminal circulating pressure.During the rising and discharging of the overflow or the well killing fluid,the casing pressure remains unchanged.
Reverse circulation well killing method is commonly used in offshore tubing conveyed perforating(TCP).With this method,the lag time is short,so that the time for killing well can be saved;the formation fluid does not pollute the casing annulus,so that the wellbore can be kept clean.According to the characteristics of offshore perforating string,we deduce the formula for calculating the densities of overflow and well killing fluid,as well as the calculation formula of shut-in pressure and circulating pressure in the well killing process.Calculation is carried out for a reverse circulation killing example.The results show that the casing pressure is the highest at the beginning,and after the overflow all goes into the drilling tool,the initial circulating pressure is lowered to the stable circulating pressure.When the well killing fluid enters the annular vacuum and reaches the negative pressure valve,the casing pressure drops to the terminal circulating pressure.During the rising and discharging of the overflow or the well killing fluid,the casing pressure remains unchanged.
引文
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[5]尹虎,张杰,孙健,等.气井溢流反循环压井理论研究与应用[J].科学技术与工程,2013,13(6):1432.Yin Hu,Zhang Jie,Sun Jian,et al.Theoretical study and application of overflow reverse circulation well killing in gas well[J].Science Technology and Engineering,2013,13(6):1432.
[6]丁亮亮,练章华,陈世春,等.高压深井压井过程中井筒温度数值模拟[J].石油钻采工艺,2011,33(4):15.Ding Liang-liang,Lian Zhang-hua,Chen Shi-chun,et al.Numerical simulation of wellbore temperature during high pressure deep well kills[J].Oil Drilling&Production Technology,2011,33(4):15.
[2]余敏,邓勇,李涧松,等.反循环司钻压井法过程中立压和套压的计算[J].西部探矿工程,2010,22(9):108.Yu Min,Deng Yong,Li Jian-song,et al.Calculation method for riser pressure and casing pressure in reverse circulation drilling well killing[J].West-China Exploration Engineering,2010,22(9):108.
[3]徐华义,余志清.适应小井眼的反循环井控方法及其计算[J].石油钻采工艺,1997,19(6):10.Xu Hua-yi,Yu Zhi-qing.Reverse circulation well control method and calculation adapted to slim hole[J].Oil Drilling&Production Technology,1997,19(6):10.
[4]董星亮,曹式敬,唐海雄.海洋钻井手册[M].北京:石油工业出版社,2011:88-90.Dong Xing-liang,Cao Shi-jing,Tang Hai-xiong.Offshore drilling manual[M].Beijing:Petroleum Industry Press,2011:88-90.
[5]尹虎,张杰,孙健,等.气井溢流反循环压井理论研究与应用[J].科学技术与工程,2013,13(6):1432.Yin Hu,Zhang Jie,Sun Jian,et al.Theoretical study and application of overflow reverse circulation well killing in gas well[J].Science Technology and Engineering,2013,13(6):1432.
[6]丁亮亮,练章华,陈世春,等.高压深井压井过程中井筒温度数值模拟[J].石油钻采工艺,2011,33(4):15.Ding Liang-liang,Lian Zhang-hua,Chen Shi-chun,et al.Numerical simulation of wellbore temperature during high pressure deep well kills[J].Oil Drilling&Production Technology,2011,33(4):15.