Build Of NMR Cuttings Analyzer's Uniform Field And Study Of On-site Applied Effect

The current NMR instruments are always large, weighty and strict to circumstance, so they are unfit for on- site application of oil field. It is necessary to design an appropriative NMR instrument used in oil field with good property, such as, small, stable, affable to circumstance and easy to operate.There are many ways of magnet design in Nuclear Magnetic Resonance. However, it will bring a series of problems to make magnet small, light, stable and having larger uniformity area . Solution of these problems relies on the computing of electromagnetism field .In this article ,we first expatiate on the problems, then optimize different ways of design ,and finally choose the best one.In this paper, size of parts of magnet derives primarily from the empirical formula, then the 2D and 3D finite element analysis, optimization and correction was done to achieve the goal of reality. Numerical calculation of finite element analysis of magnet was applied effectively to design magnet. It is a significant try.Utilizing the portable NMR cuttings analyzer, which is made up with the permanent magnet designed by numerical calculation, collection of many core's NMR signal further confirmed correctness of this design. NMR analyzer was applied on Er Lian Hao Te oil field. On the site of field ,using the portable NMR coreanalyzer ,MAGNET-2000, the fast measurement to the on-site core, wall core of a well and cuttings have been done. The porosity, permeability and mobile fluid saturation and oil saturation was measured quantificationally. As to the wall care of a well, only oil saturation was measured. Result was analyzed and compared with that of NMR logging and the conventional method.Conclusion: Result of Porosity, permeability, and mobile fluid percent from NMR cuttings analyzer is fit well with that of NMR logging at the same deep plot. On some oil field where NMR logging can't be developed, the NMR cuttings analyzer is a good substitute . In some aspect, the analyzer reduce cost of exploration and enrich the exploration method.