随钻地层压力录井技术在莺琼盆地的应用

Application of formation pressure logging technique while drilling in Yingqiong Basin

针对新探区地层压力数据来源少、精度不高给钻探带来的风险及造成的损失,中海油专门开展了相关课题的研究,系统地应用了综合录井随钻地层压力监测技术,并获得了可喜的成效。特别是在高温、超高压的莺琼盆地勘探中,通过细致的研究摸索,准确地计算了上覆地层压力系数及D指数趋势线数值,为保证随钻地层压力检测结果精确创造了条件。以莺琼盆地CHG井与DFG井为例,系统地介绍了随钻压力监测过程及方法,同时印证了录井随钻压力监测技术在高温、超高压盆地的应用是可行的、有效的,为避免井喷、井漏等事故的发生,实现安全、高效钻探创造了条件,提供了保障。

In view of the risks and losses in new exploration area caused by the less source and low accuracy of the formation pressure data, the related research topic was specially developed by CNOOC, which was systematically applied comprehensive mud logging technique of formation pressure monitoring while drilling, and had obtained gratified successes, especially during the exploration in Yingqiong Basin, which was in high temperature and superhigh pressure. Through careful study and try, overlying formation pressure coefficient and D index trend curve numerical value were worked out accurately, thus creating favourable conditions for result accuracy in detecting formation pressure while drilling. From Yingqiong Basin, taking two wells CHG and DFG as examples, the paper systematically introduced the process and methods for pressure monitoring while drilling, moreover, verified that for the mud logging technique of pressure monitoring while drilling, its application in high temperature and superhigh pressure basin was workable and effective. This technique created conditions and provided guarantee for avoiding the accidents of well blowout, lost circulation etc. and realizing drilling in safety and high efficiency.