莱87 区块钻井液技术研究及应用

莱87区块位于济阳坳陷东营凹陷青南洼陷中部断裂带上，该区块原来采用聚合物钻井液施工，不能很好满足钻井施工的要求，经常出现流变性难控制，起下钻阻卡及井壁垮塌的复杂情况。通过优选处理剂，优化钻井液，研发了强抑制防塌钻井液。该钻井液在5口井进行了现场应用，施工中井壁稳定，无复杂事故出现，机械钻速明显提高，满足了该断块钻井工程的要求，加快了勘探开发进程。

The Research and Application of Drilling Fluid on Lai 87 Oilfield

Lai 87 oilfield is located in the middle fractured zone in Dong Ying Sag belonged to Ji Yang Downwarp. The oilfield was first use polymer drilling fluid to construct which lead to some complicated problem such as difficult to control theology behavior, blockage during tripping and wellbore collapsing. After treating-agent was carefully selected, and drilling fluid system was optimized in laboratory, high inhibitive ability and anti-caving drilling fluid was developed. The new drilling fluid was field application in 5 wells, and the applications showed that wellbore was stable and no down-hole troublesome condition occurred during the course of drilling wells. At last, the speed of power drill was significantly improved, satisfied the requirements of this well drilling and accelerated the speed of exploration.