科研之友
微信
新浪微博
Facebook
分享链接
摘要
Based on the rock elastic and plastic deformation mechanisms, a systematic formation stress distribution model was evolved to study the plastic zone in sanding horizontal wells. According to the principle that the stress keeps continuous at the boundary between the elastic and plastic zones, a new model for the plastic sanding radius, which is the real boundary of elastic and plastic zones, for sanding horizontal wells was proposed. Using this model, the factors affecting the distribution of stress in plastic zone near a sanding horizontal well and the corresponding sanding radius were analyzed. The results show that in a sanding horizontal well, the plastic stress distribution and sanding radius are related to the prime principal stress, circumferential angle, drift azimuth and bottom hole flowing pressure. The relationship between plastic sanding radius and circumferential angle is directly affected by the relative magnitudes of the prime maximum horizontal principal stress and vertical principal stress. In case of high horizontal principal stress, the sanding radius in vertical direction is higher than that in horizontal direction, which means more severe sanding in vertical direction. In the case of high vertical principal stress, the law reverses correspondingly. The sanding radius varies periodically with drift azimuth. In a horizontal well with drift azimuth of 0°and 180°, the sanding radius keeps higher in horizontal direction than vertical, which means more severe sanding tendency. In case of 90°and 270° drift azimuth, the sand will be produced more seriously from vertical direction. Additionally, due to the heterogeneity distribution of rock property along wellbore trajectory, the distribution of stress and sanding radius reveal the same heterogeneity distribution characteristics.
- 出版日期2012
- 单位中国石油大学（华东）
