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安全、高效实施油气钻探作业,是石油人不断追求的目标,但在各类结构比较复杂的定向井、水平井、大位移井等钻探过程中,容易因地层压力异常及岩屑床的问题,引发各种复杂工程事故,直接影响着钻井效率、钻井成本、井身质量及钻井安全。针对冀东油田南堡5区块,大部分井在钻探过程中多次发生井漏、卡钻等工程复杂事故,严重影响了勘探速度和完钻建井周期。本文提出依托现场综合录井平台,应用后台相关软件实时计算分析地层孔隙压力、循环当量密度、井筒流态、扭矩摩阻和井眼净化,并应用这些参数实时分析目前是否可能发生井下复杂事故等情况,提出合理建议,使钻井液参数、工程参数保持在安全的钻井状态。通过现场南堡5-85侧一口定向井的实践,证实了本文提出的方法对复杂工况起到一定的预防作用。
The safe and efficient implementation of oil and gas drilling operations is a constant goal pursued by the oil people. However, in the drilling processes of directional wells, horizontal wells and extended-reach wells with complicated structures, it is easy to cause the problems of abnormal formation pressure and bed of cuttings, Trigger a variety of complex engineering accidents, a direct impact on drilling efficiency, drilling costs, well quality and drilling safety. In view of the block 5 in the South Fort of Jidong Oilfield, most of the wells have suffered from complex accidents such as well leakage and stuck pipe during the drilling process, which has seriously affected the exploration speed and completion of drilling and drilling cycles. In this paper, based on the comprehensive logging platform of the site, the real-time calculation and analysis of formation pore pressure, circulating equivalent density, wellbore fluid flow, torque friction and borehole cleaning are carried out by using the real-time software of the backstage and real-time analysis of the possibility of complicated downhole accidents And put forward reasonable suggestions to keep drilling fluid parameters and engineering parameters in safe drilling conditions. Through the practice of a directional well at 5-85 side of Nanpu site, it proves that the method proposed in this paper plays a preventive role in complex working conditions.