考虑扶正器影响的套管摩阻计算方法研究

Study On Casing Friction Calculation Method Considering the Effect of Centralizer

为了保障和提高水平井与大位移井固井质量,通常会在大斜度井段及水平段安放一定数量的套管扶正器,以保证套管居中,但同时也增大了下套管摩阻.针对安放扶正器的套管串,结合三维井眼状况,应用纵横弯曲梁理论分析了多扶正器影响下的套管串受力情况,建立了侧向力及摩阻计算模型.现场数据计算表明,考虑扶正器影响后的套管摩阻比未考虑情况下的摩阻增大4.88％～34.99％,该模型可以更为准确地预测水平井及大位移井下套管摩阻,对于指导现场下套管作业施工具有重要的指导意义.

In order to ensure and improve the quality of the cementing of horizontal and extended reach well,a certain number of casing centralizers would be placed in high angle deviated section and horizontal section to ensure the casing centering,but it also increases the casing friction.On the basis of analyzing mechanical characters of casing containing some centralizers,vertically and horizontally distort model is used and combined with 3Dborehole conditions,a model for calculating the lateral force and friction can be established.Field data indicate that the casing friction of considering the centralizer effect is 4.88%~34.99% more than that without considering the centralizer effect,this model can predict the casing friction of the horizontal well and extended reach well accurately and it has important significance to guide for casing running operation.