Theoretical and experimentation of a carved collar isolator for logging-while-drilling acoustic tool
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摘要: 隔声体的设计与效果评价对随钻声波测井仪器的研发至关重要.针对刻槽式隔声体结构，利用数值模拟的方法分析了钻铤波在其传播过程中隔声阻带形成、拓宽并达到稳定的物理过程.在此基础上优化设计并加工了一种可用于随钻声波测井实验样机的刻槽式隔声体.在实验室内利用声波频率扫描方法测量了该隔声体的钻铤波声衰减，并进一步在实验井中测试验证了隔声体在井孔中工作时的隔声效果.最后，开展了随钻测井环境下的现场实验，测到了高质量的地层波信号和对应的纵波时差.理论分析和实验对比研究结果表明，刻槽隔声体有效地降低了钻铤直达波的干扰.本文的工作为随钻声波测井刻槽式隔声体的设计及评价测试提供了一套系统的理论及实验方法.Abstract: The design of logging-while-drilling (LWD) isolator is crucial for suppressing tool waves propagating along the drill collar under LWD conditions. This study simulates and analyses the physical process of stopband forming, evolution, and stabilization of a carved collar. Based on the simulation results, we have designed and manufactured an optimal LWD prototype isolator. We measured the collar wave attenuation of the carved isolator using the frequency-sweep technique, and tested the performance of the isolator in two experimental wells in the laboratory condition. Finally, we did a field test of the tool in the LWD environment which shows that formation acoustic signals with good quality and high SNR are measured in the designated isolation stopband. The theoretical and experimental results indicate the cutting groove isolator in this study can effectively suppress the drill collar wave which provide a standard method for the design and evaluation of an LWD acoustic isolator on a carved drill collar.
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Key words:
- Acoustic logging-while-drilling /
- Isolator /
- Collar wave /
- Stopband /
- Grooved collar
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