东海水平井地质导向技术及应用

Geosteering Technology and Application of Horizontal Wells in East China Sea

为提升东海水平井实施效果,针对储层埋深大、储层厚度薄、横向变化快、砂体内部结构复杂的特点,开展了水平井地质导向技术研究,总结了一套适合东海水平井实施的地质导向策略和方法,基于测井、录井等随钻资料,开展地层精细对比,实时预判目的层深度,保障合适井眼井斜角顺利着陆;建立地质导向模型指导水平段钻进,提高水平段有效储层钻遇率,提升水平井实施效果。采用地质导向技术,平均砂岩钻遇率80.3%,平均有效储层钻遇率74.9%,取得了显著的实施效果,对东海后续水平井实施具有较高的借鉴和应用价值。

In order to improve the implementation effect of horizontal wells in East China Sea, in view of the characteristics of large buried depth, thin reservoir thickness, rapid lateral change and complex internal structure in sand bodies, the geological steering technology of horizontal wells was studied, and a set of geosteering strategies and methods suitable. The fine formation correlation is carried out with logging, mud logging and other data while drilling to predict the depth of the target zone in real time and ensure a smooth landing of the appropriate wellbore inclination, for the implementation of horizontal wells in East China Sea were summarized. The geological guidance model is established to guide drilling in the horizontal section, improve the drilling rate of effective reservoirs in the horizontal section, and improve the implementation effect of horizontal wells. The average drilling penetration rate of sandstone and effective reservoir is 80.3% and 74.9% by adopting geosteering technology, which has achieved the remarkable implementation effect, and has high reference and application value for the subsequent implementation of horizontal wells in East China Sea.