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電磁波電阻率儀器的測井響應計算方法

2074014 2011-01-15 | rar | 1.1 MB | 次下載 | 10積分

資料介紹

?研究隨鉆電磁波電阻率儀器中線圈系電磁響應的計算方法，對于測井數據的快速反演具有重要的意義。從Maxwell方程出發，導出了修正磁矢位滿足的泊松方程，并采用分離變量法和電磁場邊界條件導出了圓電流環在徑向分層介質中的磁矢位的解析解，該方法形式簡潔，易于編程，精度高。利用上述方法對隨鉆電磁波電阻率測量儀器進行了建模和計算，并分析了鉆鋌刻度曲線和井眼校正方法，所得到的結論對于隨鉆電磁波電阻率測量儀器的研制具有重要的理論價值和實際意義。

Abstract:: ?Researching on the computational methods of the electromagnetic response to the coil system in the electromagnetic wave resistivity （EWR） logging-while-drilling （LWD） tool had great significance in the fast inversion of log data. Starting from the Maxwell’s equations， the Poisson’s equation for the modified magnetic vector potential is derived， and the analytical solution of the magnetic vector potential due to the circular current loop in the radially stratified media is obtained by using the method of separation of variables and boundary condition of the electromagnetic field. This method is simple， easy to be programmed， and with high precision. The logging-while-drilling （LWD） tool for electromagnetic wave resistivity （EWR） measurement is modeled and calculated， and the scale-curves of the drilling collar and borehole correction method are analyzed. These results have important theoretical value and practical significance in designing LWD tools for EWR measurement.