义171-斜16VF井钻井技术探索与实践

Drilling technology exploration and practice of Yi 171-Xie 16VF well

义171-斜16VF井位于济阳坳陷沾化凹陷渤南洼陷中部,是渤南地区的一口非常规井,主要目的层为沙四下。该地区沙一段砂层发育,地层压力敏感,而沙三段与沙四段地层异常高压,压力矛盾凸显,安全窗口窄。当钻井过程中钻井液压力超过其承压能力时,极易压裂地层而形成圈闭裂缝,从而引起开泵漏停泵涌的复杂情况的发生。为此通过采取合适的施工措施,取得了较好的钻井效果。

Located in the central part of Bonan sub-sag in Jiyang depression,Yi 171-Xie 16 VF well is a non-conventional well in Bonan area,and the main target layer is lower Sha-4 member.Sandstone of Sha-1 member in the area was well developed with sensitive formation pressure,while Sha-3and Sha-4 member was of abnormal high pressure,of obvious pressure contradictions and narrow safety window.During the drilling process when the drilling fluid pressure exceeds its bearing capacity,it is easy to fracture formation and form fractures in traps,and then case complexities such as pumping,no leakage.Therefore by taking appropriate construction measures,good drilling effects have been achieved.