随钻声波测井仪模拟实验装置研制及应用

Development and application of simulation experimental device for acoustic logging while drilling

随钻声波测井仪器室内测试标定通常采用建造刻度井群的方式,模拟不同声速的软硬地层往往需要建造多个模拟刻度井筒,该方式不但建造成本较高,而且无法对仪器进行在线测试和调试。为了解决该问题,研制了一种随钻声波测井仪模拟实验装置代替刻度井,可以模拟随钻声波测井仪的工作环境,不但能够对仪器进行刻度和整体性能测试,还能够在同一环境中对测控电路进行在线调试。该实验装置实现方式简单,可快速实现仪器刻度,并极大方便新仪器的调试,提高随钻声波仪器的开发速度,具有很高的实用价值。基于该实验装置分别开展了随钻声波单极和四极模式的声速测量实验,实验结果表明,设计的随钻声波测井仪测量的平均纵波速度与采用时差法测得的纵波速度相比,相对误差为2.94%,精度满足现场需要。

The indoor test calibration of the acoustic logging while drilling tool usually adopts the method of constructing the scaled well group.It is often necessary to construct multiple simulated scale wellbores to simulate soft and hard formations with different sound speeds.This method not only has high construction cost,but also cannot test the instrument online.In order to solve this problem,a simulation experiment device for acoustic logging while drilling tool was developed instead of the scale well,which can simulate the working environment of the acoustic logging tool.The device can not only perform calibration and overall performance testing of the tool,but also conduct on-line debugging of the measurement and control circuit in the same environment.The experimental device is simple in implementation,can quickly realize the instrument scale,greatly facilitates the debugging of the new instrument,improves the development speed of the sonic instrument while drilling,and has high practical value.Based on the experimental device,the acoustic velocity measurement experiments of the solitary wave monopole and quadrupole modes were carried out.The experimental results show that the average longitudinal wave velocity measured by the designed acoustic logging while drilling tool is compared with the longitudinal velocity measured by the time difference method.The relative error is 2.94%,and the accuracy meets the needs of the site.