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Effect of oxygen on the NMR relaxation properties of crude oils

机译：氧对原油NMR弛豫特性的影响

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摘要

Nuclear magnetic resonance relaxation measurements of bulk fluids provide a sensitive probe of the dynamics of molecular motion. Dissolved oxygen can interfere with this technique as its paramagnetic nature leads to a reduction of the paramagnetic relaxation times of the fluids. We studied this effect for the relaxation properties of crude oils that are in general characterized by a distribution of relaxation times. The samples were stock tank oils that have been exposed to air. We compared T-1 and T-2 relaxation time distributions and their correlation functions of the initial (oxygenated) samples with those from the deoxygenated samples. Oxygen was removed from the oils with a freeze-thaw technique. As expected, the effect of oxygen is most apparent in oils with long relaxation times. In these oils the effect of oxygen can be described by an additional relaxation rate 1/T-1,2(ox) to the transverse and longitudinal relaxation rates that is sample dependent but does not vary within the relaxation time distribution of the oil. Values of 1/T-1,2(ox) for different crude oils were found to be in the range of 2.5 to 8.3 s. For crude oils that have components with relaxation times less than 100 ms, no significant oxygen effect is observed.
机译：散装流体的核磁共振弛豫测量提供了分子运动动力学的灵敏探针。溶解的氧气会干扰该技术，因为其顺磁性会导致流体顺磁性弛豫时间的减少。我们研究了原油的弛豫性能的这种影响，通常以弛豫时间的分布为特征。样品是暴露在空气中的储罐油。我们比较了T-1和T-2弛豫时间分布及其与原始样品（脱氧样品）的相关函数与脱氧样品的相关函数。用冻融技术从油中除去了氧气。如预期的那样，氧的作用在松弛时间长的油中最为明显。在这些油中，氧的作用可以通过横向和纵向弛豫速率的附加弛豫率1 / T-1,2（ox）来描述，后者取决于样品，但在油的弛豫时间分布内不发生变化。发现不同原油的1 / T-1,2（ox）值在2.5至8.3 s的范围内。对于具有弛豫时间小于100毫秒的成分的原油，未观察到明显的氧气作用。

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