North W12-1 Oilfield in Zhanjiang of Guangdong province has drilling problems of borehole wall collapse and stripping, which had often caused accidents of well and instrument burial.

• 摘要广东湛江W12-1北油田开发过程中遇到了钻井中井壁易垮塌、易剥落的难题，易造成井壁坍塌、掩埋钻井及仪器事故。