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由于介质井眼的改变,空气井中补偿中子测井仪器的响应与液体井中有很大不同,利用液体介质井眼下刻度的补偿中子测井仪不能满足气体介质井眼测井的要求。利用蒙特卡罗方法,模拟了空气井中补偿中子测井响应以及井径变化对测井响应的影响。通过仪器刻度的方法对模拟结果进行处理,得到空气钻井补偿中子测井刻度后的仪器响应与孔隙度的关系曲线以及扩径校正方法,并应用于实际井中求取中子孔隙度,取得了一定的效果。
Because of the change in the media borehole, the response of the compensating neutron logging tool in the air well is quite different from that in the liquid well, and the compensated neutron logging tool using the borehole scale of the liquid medium can not meet the requirements of the borehole logging of the gas medium. Monte Carlo method is used to simulate the effects of compensated neutron logging response and well diameter variation on well response in air well. The simulation results are processed by instrument calibration method to get the curve of instrument response and porosity after the air drilling compensates the neutron logging scale and the method of diameter expansion correction. The method is applied to the actual well to obtain the neutron porosity. A certain effect.