基于有限元的南缘高泉试验水平井稳定性评价

南缘高泉背斜清水河组储层具有三高一深（即高温、高压、高产和超深）特征，国内尚无成熟完井案例可循。为优选合适的完井方式，针对目标区试验水平井分别建立了预孔筛管完井、套管射孔完井的井筒和地层的稳定性模型，对其全生命周期井壁稳定性开展了数值模拟研究。结果表明，当井筒沿着最小水平主应力方向时，孔眼应力集中在平行于最小水平主应力方向最大，在垂直于最小水平主应力方向最小，井筒的破坏会从外壁孔眼处开始；筛管和套管只会产生部分塑性变形，变形量小于5%，发生挤毁可能性不大，但生产后期筛管完井地层必定会发生坍塌，固井后的射孔地层相对比较稳定，从井壁稳定性出发对目标区此类三高一深特征水平井可优先推荐采用射孔进行完井。

Stability Evaluation of Gaoquan Test Horizontal Well in Southern Margin Based on Finite Element Method

Qingshuihe Formation reservoir in Gaoquan Anticline in the south margin has the characteristics of high temperature, high pressure, high yield and ultra deepth. There is no mature completion case to follow in China. In this paper, the wellbore and formation stability models of pre perforated screen completion and casing perforation completion are established respectively for horizontal wells in target area, and numerical simulation study on wellbore stability in whole life cycle is carried out for opital completion mode. The results show that when the wellbore is along the direction of the minimum horizontal principal stress, the hole stress concentration is the maximum parallel to the minimum horizontal principal stress direction, and is the minimum perpendicular to the minimum horizontal principal stress direction, and the wellbore damage will start from the outer wall hole; the screen pipe and casing will only produce partial plastic deformation, with the deformation less than 5%, and small possibility of collapse, but the formation which screen tube completion is bound to collapse in the late production stage, and the perforated formation after cementing is relatively stable. Based on the wellbore stability, perforation can be preferentially recommended for such horizontal wells with similar characteristics in the target area.