套管内液力补贴作业所需轴向力分析

ANALYSIS TO AXIAL FORCE NEEDED FOR CONDUCTING IN - CASING HYDRAULIC PATCHING

套管内衬波纹管液力补贴作业过程中，挤胀波纹管时上提胀头所需的轴向力是一个十分有意义的参数。在分析挤胀波纹管受力的基础上，采用大变形弹塑有限元分析方法，结合实际数据进行计算。结果表明：当波纹管外径１０４ｍｍ，内径７０ｍｍ，壁厚３．１７ｍｍ，刚性胀头锥角３０度时，对常用低碳钢材料．套管补贴所需轴向力不超过４０ｋＮ；液力补贴工具刚性胀头锥角设计时取２５～３５度为宜；波纹管壁厚、外径和波纹条数的变化，对所需轴向力有较大影响。

During hydraulic patching of corrugated pipe in casing, the axial force for uplifting the expansion joint is very significant. On the basis of analyzing the force exerted on corrugated pipe, by means of the deforming finite element method, this paper conducts calculation by use of actual data. The calculated results indicate: when the outer diameter of the corrugated pipe is 104 mm, the inner diameter is 70 mm, and the wall thickness is 3. 17 mm, the axial force needed for casing patching does not exceed 40 kN in terms of the conventional low carbon steel; the pyramidal degree of the rigid expansion Joint of the hydraulic patching should be 25-- 35°; the wall thickness, the outer diameter and the ripples of the corrugated pipe have greater influence on the needed axial force.