悬挂封隔器卡瓦作用区段套管应力分布研究

悬挂封隔器上的卡瓦是保证水平井改造工作可靠性的重要元件，锚定后可以起到支撑、锚定封隔器和锁定胶筒的作用.但由于套管是薄壁件，在卡瓦的作用下容易破坏而造成不良后果，因此对卡瓦作用段套管的受力情况进行力学分析显得尤为重要，通过建立数学模型确定卡瓦作用区段套管的应力分布情况.结果显示，封隔器的坐封力会加大套管的环向应力，悬重会加大套管的轴向应力，两者一起会使得套管应力大幅上升，甚至造成套管产生缺陷.得到的理论公式为水平井改造现场判断悬挂封隔器作用段套管应力提供了预估参考.

Stress Distribution Analysis of the Casings Under Suspended Packer Slips

The slips in a suspended packer are very important components to ensure success of the horizontal well reconstruction technology.They can support and fasten the packer and lock the rubber when they are anchored.But the casing is liable to failure under the effect of slips since it's a thin-wall cylinder,so it is very important to conduct mechanical analysis of casings under the effect of slips.The stress distribution of the casing under actions of slips was determined with an established mathematical model.The results show that the setting force of the packer increases the hoop stress of the casing and the suspended weight magnifies the axial stress,which jointly make the casing stress much higher and even cause failure of the casing.The theoretical model provides some useful references for evaluation of the casing stress state under the effect of packer slips for the horizontal well reconstruction technology.