用套管补偿中子模拟裸眼补偿中子的方法研究

在大斜度井、水平井中如果完井没有测到物性资料可以用套管补偿中子计算地层孔隙度。但套管补偿中子资料受套管、水泥环的影响使得其测量值大于裸眼补偿中子测量值,为此,本文提出了分不同套管尺寸建立模型来校正,校正后的补偿中子与裸眼补偿中子在形状数值上基本一致。

Study on the Method of Simulating Borehole Compensated Neutron with Casing Compensated Neutron

In highly-deviated wells and horizontal wells, if physical property data fail to be measured in completion, casing compensated neutron data can be used to calculate the formation porosity.But casing compensated neutron data are affected by casing and cement sheath which make the measured value larger than that of borehole. This paper presents to establish models in different casing sizes to correct the data. The corrected compensated neutron is almost in accordance with that of borehole in shape and numerical values.