鹿邑凹陷海陆过渡相页岩气地质调查鹿页1井钻井技术

Drilling technology of Well Luye-1 for shale gas geological survey in Luyi Sag

南华北盆地鹿邑凹陷具有页岩气形成和发育的良好地质条件,区域内设计的页岩气地质调查鹿页1井井深3506.5 m。区域内属于海陆过渡相地层,地层复杂,构造发育,山西组及上石盒子组地层泥岩层段较多,施工中易出现坍塌、掉块等孔内复杂情况。针对钻井工程施工难点,通过优选钻探设备、钻头、钻井液体系等措施,总结了泥浆护壁、深孔取心、防斜等技术措施,保障了钻井工程的顺利实施,形成了一套适应于南华北盆地鹿邑凹陷海陆过渡相地层的页岩气深井钻井施工技术方法。为下一步实施同类钻井、安全优质高效开发页岩气提供了有益借鉴。

Luyi Sag in the Southern North China Basin provides beneficial geological conditions for the formation and development of shale gas.The area belongs to the marine‑continental transitional facies strata.The strata are complex and the structure is well developed;and there are many mudstone strata in Shanxi Formation and Shangshihezi Formation,which are prone to collapse and block falling during drilling.The designed depth of Well Luye-1 for shale gas survey in the region is 3506.5m.In view of the difficulties in drilling works,optimization of drilling equipment,bits and drilling fluid systems was conducted,and the technical measures such as mud wall protection,deep hole coring and anti‑deviation were summarized.These measures have ensured the smooth implementation of drilling operations and form a set of shale gas deep well drilling technology methods suitable for marine and continental transitional strata in Luyi Sag of Southern North China Basin.It provides a useful reference for the next implementation of similar drilling engineering,as well as safe,high‑quality and efficient development of shale gas.