【摘要】 过油管固井质量评价在海上油气井的弃置作业中有广泛需求，研究双层套管井的固井质量评价方法具有重要意义.针对CBL和VDL等现有高频声波技术径向穿透小，无法透过钢介质油管进行固井质量评价的缺陷，本文开展了低频偶极声波测井理论与实验研究，首先理论分析了偶极源下双层套管井的频散曲线，发现外层套管胶结不好时存在额外的高阶套管弯曲模式，在此基础上将该模式从波形中提取出来并形成偶极固井质量评价方法，最后依托实验室模型井开展了双层套管井固井质量评价实验研究，进一步验证了该方法的有效性和可靠性.理论与实验的结果表明额外的高阶套管弯曲波可以反应外层套管的水泥胶结情况，为双层套管井的固井质量评价提供了可行的方法.更多还原

【Abstract】 The evaluation of cementing quality through tubing is widely needed in the abandonment of offshore oil and gas well, so it is of great significance to study the evaluation method of cementing quality in double casing well. Aiming at the defect that the high frequency acoustic wave method such as Cement Bond Logging(CBL) and Variable Density Logging(VDL) have small radial penetration and cannot be used to evaluate the cementing quality through steel tubing, this paper has carried out theoretical and experimental research on low frequency dipole acoustic logging. Firstly, the dispersion curve of double casing well under dipole source is analyzed theoretically, and it is found that there are additional high order casing flexural modes when the outer casing is poorly cemented. On this basis, the high order casing flexural modes is extracted from the waveform and a dipole cementing quality evaluation method is formed. Finally, the experimental research on cementing quality evaluation of double casing well is carried out based on the laboratory model well, which further verifies the validity and reliability of this method. The theoretical and experimental results show that the extra high order casing flexural modes can reflect the cement bonding condition of the outer casing, which provides a feasible method for the evaluation of cementing quality of double casing well.更多还原