Effects of Powdered Fluorescent Additives on NMR Characteristics of Drilling Fluids

Abstract

Abstract:

The use of fluorescent additives in drilling fluid is beneficial for drilling safety, but may potentially have adverse effects on oil discovery. In this paper, the effects of addition of powdered fluorescent additives on the NMR characteristics of drilling fluids were investigated with high-resolution NMR spectroscopy. A total of fourteen types of powdered fluorescent additives were added to water and drilling fluid at different dosages and temperature (32 ℃, 90 ℃ and 150 ℃). The NMR spectra of the doped water and drilling fluid were then acquired. The results showed that some of the fluorescent additives showed no NMR signal, while the other showed peaks of hydrated additives. In the later case, the peak disappeared after adding relaxation reagent. It was concluded that commonly used powered fluorescent additives have no effects on the NMR characteristics of drilling fluids, and thus can be used without limitation in NMR surface logging.

Key words: powered fluorescent additive, NMR, drilling fluid, oil display, hydration peak

CLC Number:

O482.53

WANG Zhi-zhan1，QIN Li-ming1，DU Huan-fu2，WANG Xin2，ZHANG Xue-tao2，CAI Qing3. Effects of Powdered Fluorescent Additives on NMR Characteristics of Drilling Fluids[J]. Chinese Journal of Magnetic Resonance.

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