南海C区块高温高压气井井控技术

发布时间：2019-02-15 07:50

【摘要】：为确保南海C区块高温高压气井钻井过程中的井控安全,针对存在的地层压力高且复杂、地层温度高、钻井液安全密度窗口窄、高密度钻井液性能维护困难等井控技术难点,制定了实时检测溢流、控制溢流量,压井时逐渐提高压井液密度,防止发生井漏,钻井液降温和性能维护,井下溢漏共存处理等技术措施。防止井漏的技术措施包括提高地层承压能力和钻井液的封堵性、优化井身结构、控制井底循环当量密度、阶梯开泵、简化钻具组合及控制下钻速度等。南海C区块30余口高温高压井在钻井过程中采取了制定的井控技术措施,未发生井控事故。这表明,采取所制定的井控技术措施可以确保南海C区块高温高压气井的钻井井控安全。
[Abstract]:In order to ensure the well control safety in the drilling process of high temperature and high pressure gas wells in South China Sea C Block, the difficulties of well control technology such as high formation pressure and complexity, high formation temperature, narrow window of drilling fluid safety density, difficulty in maintaining the performance of high density drilling fluid, etc. Some technical measures such as real-time detection of overflow, control of overflow flow, increasing density of well killing fluid, prevention of well leakage, cooling of drilling fluid, performance maintenance and treatment of downhole overflow are made. The technical measures to prevent well leakage include improving formation pressure bearing capacity and plugging property of drilling fluid, optimizing wellbore structure, controlling bottom hole circulation equivalent density, stepping pump, simplifying drilling tool combination and controlling drilling speed etc. More than 30 high temperature and high pressure wells in South China Sea C block have adopted the well control technical measures in the drilling process, and no well control accidents have occurred. This indicates that the well control measures can ensure the safety of drilling well control in the high temperature and high pressure gas wells in South China Sea C block.
【作者单位】：中国石化上海海洋油气分公司;中石化海洋石油工程有限公司上海钻井分公司;
【分类号】：TE52

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