煤矿瓦斯抽排井套管强度校核计算方法探讨

Discussion on Checking Calculation Method for Casing Strength of Mine Gas Pumping-exhaust Well

摘要:

近年来在煤矿安全生产中瓦斯抽排井得到越来越广泛的应用。这类井施工周期长、难度大、要求高，再加上套管直径大、总质量大、施工和套管的成本费用也很高，据所掌握的工程资料，国内已有数口井在施工过程的不同环节发生了不同形式的套管挤毁事故，造成整井报废，损失惨重。以某瓦斯抽排井下套管过程中工作套管发生严重挤毁事故为例，对其受力情况进行了深入分析，并在此基础上对大直径套管三轴应力强度校核计算方法作了详细论述。通过与传统单轴应力强度计算方法进行对比分析认为，套管三轴应力强度计算结果更准确科学，采用三轴应力强度计算方法指导前期套管设计，工程质量更加安全可靠，值得推广应用。

Abstract:

Gas pumping-exhaust well is applied more and more widely in coalmine safety production in recent years, but its construction period is long with difficulty. Take the example of serious collapsing accident, analysis was made on the case stress; based on the analysis, the checking calculation method for tri-axial stress of large diameter case was discussed in detail. By the comparative analysis, the tri-axial stress calculation results are more accurate than the ones by traditional uniaxial stress calculation method.