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With satisfaction to the requirement of "infinite" medium, the geometry of calibration pit for neutron log has been calculated and studied theoretically with numerical simulation method. Based on the theory of degroup P1 scattering approximation, the geometry calculations are made by NNLSP software package and satisfactory results are obtained. They can be used as reference while building calibration pits. It is the first time in China that numerical simulation has been used for neutron log. It also proves that...

With satisfaction to the requirement of "infinite" medium, the geometry of calibration pit for neutron log has been calculated and studied theoretically with numerical simulation method. Based on the theory of degroup P1 scattering approximation, the geometry calculations are made by NNLSP software package and satisfactory results are obtained. They can be used as reference while building calibration pits. It is the first time in China that numerical simulation has been used for neutron log. It also proves that the influence of tool parameters, geologic parameters on neutron log, especially those problems which are hard to be solved by calibration pit can be studied by numerical simulation.

谢仲生等,应用数值方法确定中子测并中模型并几何尺寸的研究.测并技术,1994.18(2):94~100本文应用数值模拟方法从理论上对中子测井标准刻度井的几何尺寸进行了计算与研究。该尺寸应满足“无限大”介质的要求。计算系采用分群P-1-近似理论,应用NNLSP软件包进行,取得了满意的结果,可供建造刻度并参考,这是国内第一次应用数值模拟的方法从理论上对中子测井问题进行研究。进一步说明应用数值模拟可以对测井中一些理论和实际问题,特别是对一些在模型井上难以实现的问题进行估算和研究。

Based on analyzing the characteristics and limination of transmission line model and curved surface integral model for resistivity logging through casing, the mathematical expression of the curved surface integral equation is derived for complex formation and its numerical solution is obtained by using subdomain method. The resistivity log response, environmental effect and its tool parameters are investigated systematically. The computed...

Based on analyzing the characteristics and limination of transmission line model and curved surface integral model for resistivity logging through casing, the mathematical expression of the curved surface integral equation is derived for complex formation and its numerical solution is obtained by using subdomain method. The resistivity log response, environmental effect and its tool parameters are investigated systematically. The computed log for the simulated formation agrees with the actual lateral 3 and induction logs. This study provides the ground for the tool design and lays the foundation for the interpretation of resistivity log through metal casing.

分析了套管井电阻率测井的传输线方程模型和曲面积分方程模型的特点及局限性;给出了复杂地层模型下的曲面积分方程表达式,采用子区域法求其数值解。用该方法系统地考察了套管井电阻率测井响应、环境影响、仪器参数。最后给出了实际地层模型下计算出的测井曲线,得到了与三侧向测井、感应测井一致的效果。为套管井电阻率测井仪器参数设计提供了依据,也为套管井电阻率测井解释打下了基础

In this paper, a control system applicable for maintenance and verification of SL1318 gamma ray spectrolog tool is briefly introduced. The system includes a host personal computer and a communication circuit, which interfaces the computer and the downhole tool to be tested. It can replace the surface system of CLS-3700-series digital logging system. It is capable of communicating with the gamma ray spectrolog tool, adjusting the tool parameters and displaying the spectrum and all the...

In this paper, a control system applicable for maintenance and verification of SL1318 gamma ray spectrolog tool is briefly introduced. The system includes a host personal computer and a communication circuit, which interfaces the computer and the downhole tool to be tested. It can replace the surface system of CLS-3700-series digital logging system. It is capable of communicating with the gamma ray spectrolog tool, adjusting the tool parameters and displaying the spectrum and all the measured data simultaneously. It can help the maintenance engineers quickly find or locate troubles about the spectrolog tool, thus, promoting maintenance efficiency and quality.

简要介绍了一种用于自然伽马能谱测井仪地面维修的调校控制系统。它采用PC系列微机作为主机,配以主机与井下仪器专用的通信电路,该设备能够代替CLS-3700数控测井仪的地而系统,可对自然伽马能谱仪进行调整控制及接收仪器的上传数据,并实时显示能谱图及各种测量参数值。据此,维修工程师可以迅速定位故障所在的部位,提高了仪器的维修工作效率和质量。

 
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