摘要
为了解决滑套卡球影响压裂残液排出和油气井正常生产的问题,开展了滑套密封筒卡球研究与分析。建立了滑套与密封球受力简化模型,对密封球在球座斜面上的受力进行了分析,给出了密封球在球座斜面上不发生卡球的条件和解卡力的计算式。指出压裂时密封球与球座发生弹性变形是密封球卡住的根本原因,密封球坐在球座斜面上可降低卡球的风险;钢密封球在球座夹角大于8.53°的球座上不会发生卡球现象,复合密封球在球座夹角大于16.70°的球座上也不会发生卡球现象;卡球时最大解卡力由压裂时最大压力及与球座和球座材料有关的系数决定。
To solve the problem of sliding sleeve sticking the ball to affect the discharge of remaining fracturing fluid and normal production of oil and gas wells, the study and analysis of sliding sleeve seal bore sticking the ball were conducted. The simplified force model of sliding sleeve and seal ball was established. The force of the ball on the inclined plane of the ball seat was analyzed. The conditions and the calculation formula for unfreezing force were given that ensure the ball will not get stuck on the plane. It was pointed out that the elastic deformation of the seal ball and the ball seat in fracturing is the basic reason for the ball to get stuck. The ball sitting on the plane can reduce the sticking risk. The steel seal ball will not get stuck when the included angle of the seat is greater than 8.53°. The compound seal ball will not get stuck when the included angle of the seat is greater than 16.70°. The maximum unfreezing force in ball sticking is determined by the maximum pressure in fracturing as well as the relevant coefficient of the seat and the seat material.
出处
《石油机械》
北大核心
2013年第2期75-78,共4页
China Petroleum Machinery
基金
中国石油天然气股份有限公司重大科技专项"致密气藏开发重大工程技术研究"之课题"致密气藏多层多段压裂技术研究"(1202-2)
关键词
分层压裂
滑套
密封球
球座斜面
卡球
解卡力
密封筒
layered fracturing
sliding sleeve
seal ball
ball seat inclined plane
ball sticking
unfreezing force
seal bore
