多功能超声波成像测井仪应用效果评价

多功能超声成像测井仪采用超声脉冲反射法进行套损及水泥胶结质量评价.对该仪器实测的波形进行分析,波形信噪比良好,首波为套管内壁的反射波,随后到达的为套管共振波,波形频谱曲线具有明显的谱陷特征.利用井眼内壁反射波的幅度及到时曲线可实现井眼内壁高分辨率成像;利用套管共振波的共振频率及幅度衰减可分别计算套管厚度及套管后面材料的水泥声阻抗.现场实测的裸眼井资料表明,该仪器可获取井壁表面裂缝、层理、孔洞等地质构造信息.处理现场实测的套管井资料表明,仪器可正确测量套管的壁厚,识别套损方位,同时还可以根据水泥声阻抗的数值范围确定一界面材料是气体、液体还是固体成分.该仪器具有井眼内壁成像、套损评价及水泥胶结质量评价的功能.

Evaluation on Application Effect of Multi-functional Ultrasonic Imaging Logging Tool

The multi-functional ultrasonic imaging logging tool can be used for casing inspection and cement bonding evaluation by using ultrasonic pulse echo technique. The field data measured by the MUlL shows that the reflection wave will be firstly received by transducer and then is the resonance wave. The character of spectrum trap is visible obviously in frequency spectrum curve of waveform. The casing＇s internal conditions can be inspected from the echo amplitude and transit time. The casing thickness and the cement impedance can be calculated from the resonance frequency and resonance decay. It shows that this tool can evaluate the geo- logic feature information, such as fracture, vug and bedding structure in the opened-hole. Weather the component of material behind casing is gas, liquid or solid can be curtained based on the variable range of cement impedance. The measurement result shows that this tool has the function of borehole imaging, casing inspection and cement bonding evaluation.