取换套修井管柱防卡力学分析与计算

通过取换套修井中套铣管柱的力学分析，建立了考虑压差和粘吸作用下套铣管柱的防卡力学模型．依此计算了管柱在不同井深下防卡的最长静止时间，并分析了影响管柱阻卡的主要因素．

THE MECHANICAL ANALYSIS ON PREVENTING MILLED SLEEVE FROM STICKING IN REPAIRING WELL

The well repairing by drawing casing and changing is a new technology for restoring a well of casing failure and is very effective.During the well repairing,the diameter of the milled sleeve is large and the clearance is small,so that the sticking of the milled sleeve becomes very serious.It often increases the repairing period and repairing cost. In this paper, the theoretical model of preventing milled sleeve from sticking is established by a mechanical analysis. It takes account of both pressure difference and sticking effect on the milled sleeve. On the basis of the model, the longest time for the milled sleeve stopped in the well is calculated, so that it can be prevented from sticking. The main factors of sticking milled sleeve are analyzed.