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合适的低场核磁共振(LF-NMR)检测条件及检测参数对于钻井液含油率数据结果的准确性、重复性及稳定性具有非常重要的意义。本文研究了水基聚合物钻井液LF-NMR测试中聚合物钻井液样品的配置条件、检测量对含油率检测结果的影响;同时还研究了LF-NMR测试过程中,LF-NMR采样参数及拟合方法对含油率检测结果的影响。结果表明,水基聚合物钻井液的最佳测试量为6 g,且在放入探头前需要加入20-30%量的氯化锰溶液,且溶液浓度为60%;加入氯化锰溶液后,搅拌10 min后,静置0.5~1.5 h后进行测试较好;测试使用CPMG序列测试,SW设置为100 kHz,TE设置为0.3 ms,NS为32或64;研究结果可为后期应用LF-NMR技术进行水基聚合物钻井液含油率检测提供适当的检测条件参考。
Appropriate low-field nuclear magnetic resonance (LF-NMR) testing conditions and testing parameters are very important for the accuracy, repeatability and stability of the data of oil content in drilling fluid. In this paper, we studied the configuration conditions of polymer drilling fluid in LF-NMR test of water-based polymer drilling fluid and the influence of the amount of detection on the test results of oil content. At the same time, the parameters of LF-NMR sampling and Effect of Fitting Methods on Oil Content Test Results. The results show that the best test volume of water-based polymer drilling fluid is 6 g, and 20-30% manganese chloride solution needs to be added before putting the probe, and the solution concentration is 60%; after adding manganese chloride solution , And the test was performed after standing for 0.5-1.5 h after being stirred for 10 min. The test was performed using the CPMG sequence test with SW set to 100 kHz, TE set to 0.3 ms, and NS set to 32 or 64. The results could be used for the later application of LF- NMR technology for water-based polymer drilling fluid detection rate to provide appropriate detection conditions for reference.