Study on Flow Field Characteristics in Deflecting Section of Shale Gas Horizontal Well

Abstract

In order to study the characteristics of flow field at different deflecting sections of shale gas horizontal Wells, actual downhole string model is established to study the bottom-hole and annulus flow field characteristics by numerical simulation technology. The results show that the variation of deviation Angle has little influence on bottom hole and near bottom annulus flow field. When optimizing construction hydraulic parameters, the influence of the variation of inclined angle on bottom-hole flow field can be neglected. However, the distribution of annular velocity far away from the bottom hole is different, and the flow field characteristics of high inclined angle well are better than others, it is not easy to form cuttings bed during in construction. But more attention should be paid to problems of rock carrying in the low angle deflecting section of well. The research results can be used to guide the optimization of construction parameters and focus on the difficult problems in deflecting section of shale gas horizontal Wells.