噪声频谱测井与其他测井技术在气井找漏找窜中的组合应用

Combined Application of NST and Other Logging Techniques in Detecting Leakage and Channeling of Gas Well

为快速准确地诊断储气库井套管漏失和水泥环窜槽位置,组合应用了噪声频谱测井(NST)和其他测井技术。运用噪声频谱测井仪,通过分析噪声的频率和幅度,能够确定套管漏失和套管外窜流的位置,以及流体性质。应用效果表明,噪声频谱测井与多臂井径-电磁测厚组合测井(MIT+MTT)和脉冲中子全谱测井(PNST)、硼中子寿命测井组合应用,优势互补、相互验证,能够更全面地反映气体漏窜状况,大大提高了测井成功效率,具有较强的适用性。

A combination of NST spectral noise tool and other logging techniques is used to quickly and accurately diagnose intervals of casing leakage and cement sheath channeling in underground gas storage wells.By analyzing the frequency and amplitude of the noise,the NST tool can determine the intervals of casing leakage and channeling out of the casing as well as fluid properties.Field application results show that the combination of NST with MIT+MTT logging,PNST logging and boron neutron lifetime logging can complement and verify each other,which can reflect the gas leakage and channeling more comprehensively,and greatly improve the logging success rate.The combined logging is highly suitable for gas wells.