侧向仪器主屏流比和剩余电位电路测量理论算法研究

Theory and algorithm research on the ratio of main current & bucking current and rest potential circuit measurement of laterolog tool

研究硬聚焦侧向仪器主屏流比和剩余电位对测井结果的影响,聚焦主屏流比和剩余电位的电路简化测量方法,借助正演方法对仪器主屏流测量电路模型进行简化,搭建主电流测试电路和屏流测量电路,并给出理论计算方法和结果分析,结果显示该方法能够在基于电路简化模型基础上给出主屏流比和剩余电位测试结果,该测试结果可以在一定程度上校正仪器正演模型的误差。继续分析该方法在主聚焦电路参数测试中的应用优势,能够对方位阵列侧向不同方位主电流测量的参数进行量化对比,保证仪器方位上的一致性,也为继续优化主聚焦电路提供了数据支撑。

This paper studies the influence of the ratio of main current & bucking current and the rest potential of the hard focus lateral tool on the logging results, the circuit simplified measurement method of the the ratio of main current & bucking current and the rest potential, simplifies the circuit model of the main current & bucking current measurement of the tool with the help of the forward method, builds the main current test circuit and the bucking current measurement circuit, and gives the theoretical calculation method and the result analysis. The results show that the method can be based on the electricity simplified model, the ratio of main current & bucking current and rest potential test results are given. The test results can correct the errors of the forward model of the tool to a certain extent. The application advantages of this method in the main focus circuit parameter test are analyzed. It can quantize and compare the parameters of the main current measurement in different directions of the array azimuthal laterolog, ensure the consistency of the tool orientation, and provide the data support for the continuous optimization of the main focus circuit.