深水钻井气侵井控风险分析
发布时间：2018-09-09 13:46
【摘要】：深水钻井尤其是深水高压气层钻井过程的井筒压力控制是关系到钻井安全的关键之一。准确掌握钻进和压井过程中由于气侵引起的井筒内压力变化规律、气体上升及体积变化规律、井口溢流量增长规律,及时评价不同地层和施工条件下的井控风险及风险强度,对制定合理井控风险防范和压井施工措施具有重要意义。本论文针对深水钻井气侵井控风险评价问题,在系统调研钻井和井控过程中井筒温度、压力计算方法以及风险评价方法研究进展和成果的基础上,通过理论分析,建立了深水钻井和气侵井控过程中井筒内温度和压力的计算模型,分析了钻进气侵溢流过程中井底压力、泥浆池增量、溢流发现时间的变化规律,研究了不同气层特点和压井参数条件下压井过程中套管压力的变化特征。依据井口装置承压能力、套管抗内压能力和地层破裂压力条件,建立了区分井控风险“安全、相对危险和危险”的3个级别的判别方法。并应用南海东部NH3-2井的钻井资料对该井进行了井控风险分析。研究结果表明,地层渗透率、井底压差、溢流发现时间、泥浆池增量等是影响井控难度的主要因素。对NH3-2井,溢流量控制在0.6m3以内为安全区,溢流量在0.6m3到8.4m3之间为相对危险区,溢流量超过8.4m3为危险区。研究成果为深水钻井气侵井控难度的预测和溢流报警限的合理确定以及压井措施的制定提供了手段。
[Abstract]:Well bore pressure control in deep water drilling, especially in deep water high pressure gas formation, is one of the key factors related to drilling safety. In order to evaluate the well control risk and risk intensity under different formation and construction conditions, we can accurately grasp the law of wellbore pressure change, gas rise and volume change, well overflow flow growth, and well control risk and risk intensity under different formation and construction conditions caused by gas invasion during drilling and well killing. It is of great significance to make reasonable well control risk prevention and well-killing measures. In this paper, aiming at the risk evaluation of gas invasion control in deep water drilling, on the basis of systematic investigation and research on wellbore temperature, pressure calculation method and risk assessment method during drilling and well control, theoretical analysis is carried out. The calculation model of wellbore temperature and pressure during deep water drilling and gas invasion control is established, and the variation law of bottom hole pressure, mud pool increment and overflow discovery time during drilling gas invasion overflow is analyzed. The variation characteristics of casing pressure in the process of well-killing under different gas reservoir characteristics and well-killing parameters are studied. According to the pressure bearing capacity of wellhead device, casing resistance to internal pressure and formation fracture pressure condition, three levels of distinguishing well control risk "safety, relative danger and danger" are established. Well control risk analysis of NH3-2 well in the east of South China Sea is carried out. The results show that formation permeability, bottom hole pressure difference, overflow discovery time and mud pool increment are the main factors affecting the difficulty of well control. For NH3-2 well, the overflow flow is controlled within 0.6m3 as a safe area, the overflow flow between 0.6m3 and 8.4m3 is a relative dangerous area, and the overflow amount exceeds 8.4m3 as a dangerous area. The research results provide a means for predicting the difficulty of gas invasion control in deep water drilling, reasonably determining the limit of overflow alarm and making the measures of well killing.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE52
本文编号：2232560
[Abstract]:Well bore pressure control in deep water drilling, especially in deep water high pressure gas formation, is one of the key factors related to drilling safety. In order to evaluate the well control risk and risk intensity under different formation and construction conditions, we can accurately grasp the law of wellbore pressure change, gas rise and volume change, well overflow flow growth, and well control risk and risk intensity under different formation and construction conditions caused by gas invasion during drilling and well killing. It is of great significance to make reasonable well control risk prevention and well-killing measures. In this paper, aiming at the risk evaluation of gas invasion control in deep water drilling, on the basis of systematic investigation and research on wellbore temperature, pressure calculation method and risk assessment method during drilling and well control, theoretical analysis is carried out. The calculation model of wellbore temperature and pressure during deep water drilling and gas invasion control is established, and the variation law of bottom hole pressure, mud pool increment and overflow discovery time during drilling gas invasion overflow is analyzed. The variation characteristics of casing pressure in the process of well-killing under different gas reservoir characteristics and well-killing parameters are studied. According to the pressure bearing capacity of wellhead device, casing resistance to internal pressure and formation fracture pressure condition, three levels of distinguishing well control risk "safety, relative danger and danger" are established. Well control risk analysis of NH3-2 well in the east of South China Sea is carried out. The results show that formation permeability, bottom hole pressure difference, overflow discovery time and mud pool increment are the main factors affecting the difficulty of well control. For NH3-2 well, the overflow flow is controlled within 0.6m3 as a safe area, the overflow flow between 0.6m3 and 8.4m3 is a relative dangerous area, and the overflow amount exceeds 8.4m3 as a dangerous area. The research results provide a means for predicting the difficulty of gas invasion control in deep water drilling, reasonably determining the limit of overflow alarm and making the measures of well killing.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE52
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