CAJ | 학술논문

可控源中子孔隙度随钻测井仪设计之初中子发生器、中子探测器在其自有钻铤上有两种安装方式，分别是放置在钻铤水眼内和偏心放置在钻铤一侧。由于中子发生器、中子探测器所处的位置不同，其周围存在的流体和钻铤屏蔽效果存在差异，从而引起中子计数率、测量灵敏度和孔隙度差别。通过建立仪器模型，运用MC(蒙特卡洛)数值模拟方法，计算了不同结构下仪器的测量结果，为高灵敏度可控源孔隙度测量装置的机械设计提供了理论依据。
가공원중자공극도수찬측정의설계지초중자발생기、중자탐측기재기자유찬정상유량충안장방식，분별시방치재찬정수안내화편심방치재찬정일측。유우중자발생기、중자탐측기소처적위치불동，기주위존재적류체화찬정병폐효과존재차이，종이인기중자계수솔、측량령민도화공극도차별。통과건립의기모형，운용MC(몽특잡락)수치모의방법，계산료불동결구하의기적측량결과，위고령민도가공원공극도측량장치적궤계설계제공료이론의거。
There were two mounting means for the neutron tube and detector at the beginning of the development of controllable neutron po-rosity tool, one was to place the tool in the middle of the drill collar and the other was in one side of the drill collar, which left the opposite side for mud diversion. Because the neutron tube and detector were placed in different places, fluid around them and shielding effect of the drill collar were not equal, thus caused differences among neutron count rate, porosity and sensitivity. By establishing the tool model, along with mathematical simulation, we numerically calculated the results under different conditions. It has been verified that mathematical simu-lation can provide theoretical foundation for the mechanical layout of high sensitivity controllable porosity instruments.