Drabina A, Dwora D, Loskiewicz J, Zorski T
H. Niewodniczañski Institute of Nuclear Physics, Krakow, Poland.
Appl Radiat Isot. 2001 May;54(5):849-52. doi: 10.1016/s0969-8043(00)00329-8.
Czubek has obtained a practically successful solution of a two-layer borehole geometry using the neutron diffusion approximation. Czubek and Woznicka solved the more realistic three-layer borehole model, which includes a middle layer consisting of mud-cake or steel tubing, in this approximation. The comparison with experimental data for 15-mm thick steel tubes shows some discrepancies. By using an exact Monte Carlo solution of the Boltzmann equation for calculating the migration length, measurements agree more closely with the "general calibration curve". This opens opportunities for cased borehole logging.
楚贝克利用中子扩散近似法得到了两层钻孔几何结构的实际成功解决方案。楚贝克和沃兹尼卡在此近似法下求解了更现实的三层钻孔模型，该模型包括由泥饼或钢管组成的中间层。与15毫米厚钢管的实验数据比较显示出一些差异。通过使用玻尔兹曼方程的精确蒙特卡罗解来计算迁移长度，测量结果与“通用校准曲线”更为接近。这为套管井测井带来了机遇。
