Determination of pores properties in rocks by means of helium-3 NMR: A case study of oil-bearing arkosic conglomerate from North belt of crude oil, Republic of Cuba

Safiullin, K. R.; Kuzmin, V. V.; Bogaychuk, Alexander; Alakshin, E. M.; González, Lisset Miquel; Kondratyeva, E. I.; Dolgorukov, Gleb; Gafurov, Marat; Klochkov, A. V.; Tagirov, M. S.

doi:10.1016/j.petrol.2021.110010

Cited by 8 publications

(1 citation statement)

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“…Nuclear magnetic resonance (NMR) is a non-destructive technique that has been widely applied for investigating hydrogen-bearing reservoir fluids' petrophysical properties [19][20][21][22][23][24][25]. Based on the fully water-saturated and centrifuged NMR transverse relaxation time (T 2 ) distribution of coals, Zheng et al [22] calculated the T 2 cutoff values and then used them to classify pore types and evaluate the full-scale pore size distribution.…”

Section: Introductionmentioning

confidence: 99%

An NMR-Based Method for Multiphase Methane Characterization in Coals

et al. 2022

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Discriminating multiphase methane (adsorbed and free phases) in coals is crucial for evaluating the optimal gas recovery strategies of coalbed methane (CBM) reservoirs. However, the existing volumetric-based adsorption isotherm method only provides the final methane adsorption result, limiting real-time dynamic characterization of multiphase methane in the methane adsorption process. In this study, via self-designed nuclear magnetic resonance (NMR) isotherm adsorption experiments, we present a new method to evaluate the dynamic multiphase methane changes in coals. The results indicate that the T2 distributions of methane in coals involve three different peaks, labeled as P1 (T2 < 8 ms), P2 (T2 = 20–300 ms), and P3 (T2 > 300 ms) peaks, corresponding to the adsorbed phase methane, free phase methane between particles, and free phase methane in the sample cell, respectively. The methane adsorption Langmuir volumes calculated from the conventional volumetric-based method qualitatively agree with those obtained from the NMR method, within an allowable limit of approximately ~6.0%. Real-time dynamic characterizations of adsorbed methane show two different adsorption rates: an initial rapid adsorption of methane followed by a long stable state. It can be concluded that the NMR technique can be applied not only for methane adsorption capacity determination, but also for dynamic monitoring of multiphase methane in different experimental situations, such as methane adsorption/desorption and CO2-enhanced CBM.

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