南海北部深水录井实践

A practice of deep water logging in the northern South China Sea

南海北部深水区水体巨厚、泥线处温度低,钻井须使用粗长的隔水管,而该区含油构造盖层和储层,成岩性又较差,这给录井作业带来了岩屑样品代表性差、从钻井液中脱气困难,以及钻井液体积精确检测和钻井取心深度校正难度大等问题。整合应用智能综合录井THEMA技术、流体萃取技术,以及多种烃类检测和岩样鉴定技术,在油气发现和工程监测两方面均取得了很好的效果,初步建立了南海北部深水录井独特的技术体系和作业方式。

In the deep water area in the northern South China Sea,some problems occurred in the logging operation due to very thick water,quite low mudline temperaurte,coarse and long marine risers used in drilling and lower diagenetic grade of the reservoir and seal rocks in the oil-bearing structures,including the poor representativeness of cutting samples and the difficulties to degas drilling mud,to accuratelly detect mud volume and to correct coring depth.An integrated application of multiple techniques,such as the intelligent comprehensive logging THEMA,the fluid extraction and various techniques of hydrocarbon detection and rock sample identification,has resulted in good effects in both hydrocarbon discovery and engineering detection,and an unique technical system and operation mode have been preliminarily established for the deep water logging in the northern South China Sea.