Development Of NMR Activation Sets Research And Tool Design Software

2D NMR logging activation sets are acquisition means aiming at obtaining specific formation information.It directly determines the adaptability of NMR instruments to different types of reservoirs and the credibility of original data.In this paper,based on the component elements and working mechanism of the activation,a set of software for 2D NMR logging activation sets design with visualization function is developed by using C#language,then the corresponding activation sets is designed by using the design software combined with the ideal fluid model,and the forward and inverse numerical simulation of the model is completed based on the two-dimensional NMR spectral equation,and the simulated two-dimensional inversion spectrum is obtained.Finally,the rationality of the activation sets is verified by the comparison between the inversion results and the fluid model.Thus,a set of pre-logging design software for 2-D NMR logging with complete functions can be formed.This paper focuses on the following two aspects of in-depth research:Firstly,the research of activation sets design software and the development of tool design software.At present,there are many kinds of mainstream 2D NMR logging tools,and the activation sets of 2D NMR logging consists of many elements,and the constraints between elements are complex.In order to simplify the work,this paper focuses on the working mechanism of activation sets of Baker Atlas multi-dimensional nuclear magnetic instrument MREX.Firstly,the composition elements and working mechanism of activation sets are clarified by investigating relevant literature.On this basis,combining with the relevant needs of observer pattern designer,the realization idea of design software is constructed.Finally,the design software of activation sets is completed by using C#programming language.The software supports the design of activation sets for 2D NMR logging and NMR core analyzer,at the same time,the software provides three kinds of parameter editing methods,observation mode optimization and graphical display functions.The software realizes flexible adjustment of activation sets and solves the problems that exist in the former mainstream 2D NMR logging activation sets,such as low SNR of raw data,incomplete loading of fluid relaxation characteristics due to inadequate fixed acquisition parameters and flexible adjustment,etc.In addition,the software also provides the output function for the information of acquisition parameters and acquisition timing.Secondly,the application effect of the activation sets is verified by numerical simulation.Pre-test design of nuclear magnetic resonance logging is very important for fluid identification.Firstly,an ideal fluid model is constructed according to reservoir conditions and fluid properties.Then,according to the activation sets designed by the model,forward numerical simulation and data inversion are performed to obtain the two-dimensional spectral distribution of the fluid model.Finally,the validity of the optimized activation sets is verified by comparing the inversion results with the structural spectrum,and achieve the purpose of Pre logging design by optimizing the activation sets.