水平井投球滑套密封结构研究  

Study on Sealing Structure of Ball Actuated Sliding Sleeve for Horizontal Wells

作　　者：李斌[1] 沈桓宇 朱兆亮[1] 李强 陈海涛 

机构地区：[1]西南石油大学机电工程学院 [2]中海油服油田生产研究院 [3]中国石油川庆钻探工程有限公司安全环保质量监督检测研究院

出　　处：《石油机械》2015年第7期104-107,共4页China Petroleum Machinery

摘　　要：水平井分段压裂完井技术的核心工具之一是投球滑套。滑套在坐封面常出现球座表面被压溃而造成密封失效。为了有效解决投球和球座间的密封失效问题,基于Hertz接触理论,推导出适用于投球滑套的最大接触压力及接触长度的理论公式,并提出一种新型投球滑套密封结构。利用ABAQUS分析软件对比分析了常规和新型投球滑套密封结构在相同条件下的接触压力分布规律,研究了不同坐封力下投球与球座间的接触压力和Mises应力分布规律。研究结果表明,新型密封结构的表面接触压力由1 082 MPa减至976 MPa,降低了球座被冲蚀压溃的风险;球座接触面长度由1.37 mm增至1.76 mm,增大了接触面的接触面积,提高了投球滑套密封可靠性。The ball actuated sliding sleeve is commonly used as the key tool for horizontal well multistage frac- turing. To address the sealing failure between frac ball and ball seat caused by defects of ball seat surface, the theo- retical formula for maximum contact pressure and contact length of sliding sleeve is deduced based on the Hertz con- tact theory. A new ball actuated sliding sleeve seal structure is proposed. ABAQUS is used for comparative analysis of contact pressure distribution of conventional and new ball actuated sliding sleeve seal structure under the same conditions. The contact pressure and Mises stress distribution between frac ball and ball seat under various setting forces are also studied. The results show that the contact pressure of the new seal structure surface has been reduced from 1 082 MPa to 976 MPa, reducing the risk of ball seat erosion and crush. The length of ball seat contact surface increases from 1.37 mm to 1.76 mm, resulting in an increased contact area and enhanced sealing reliability. The new seal structure could be widely applied in multistage fracturing technology.

关 键 词：水平井 分段压裂 投球滑套 ABAQUS 密封失效 

分 类 号：TE934[石油与天然气工程—石油机械设备]