New Tools Improve the Economics of Coring

Filshtinsky, Michael; Quinn, Joel

doi:10.2118/12092-ms

Cited by 5 publications

(1 citation statement)

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“…Porém, a coleta e a preparação de testemunhos envolvem procedimentos de alto custo e grande demanda de tempo, limitando a obtenção de testemunhos (FILSHTINSKY; QUINN, 1983).…”

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Estudo da permeabilidade de meios porosos por Ressonância Magnética Nuclear ênfase em reservatórios de petróleo

Pezzatti¹

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Conventional oil reservoirs are sedimentary rocks that can store and allow the flow of hydrocarbons or water inside. Among the petrophysical properties of reservoir rocks, permeability stands out. During well-logging activities, the Nuclear Magnetic Resonance (NMR) technique is the only well-logging tool that allows estimating the permeability of rocks inside the well. Two NMR permeability models are frequently used by the oil industry: the free fluid model (Timur-Coates or Coates) and the SDR (Schlumberger-Doll-Research). It is observed that there are no dynamic parameters in any of these two most widely used NMR permeability equations. Thus, the objective of this study was to improve the estimation of the permeability of reservoir rocks by Nuclear Magnetic Resonance by adding a dynamic parameter to the SDR model, in order to obtain a new permeability equation by NMR, called K LEAR , where LEAR is the Portuguese acronym of the High Resolution NMR Spectroscopy Laboratory of IFSC/USP. The dynamic parameter chosen was the velocity of magnetization exchange between different sites ( M  ), which is observed through NMR exchange experiments. In general, it was possible to observe that there are correlation between the velocity of exchange of magnetization between different sites of the porous media and the permeability, however these correlations are different for sandstones and carbonates.This way, new NMR permeability equations have been proposed, one specific for sandstones and another one for carbonates. These new permeability equations fit better with gas permeability results when compared to the traditional K SDR model. Since the quality and accuracy of information obtained from well-logging has a significant impact on the economic viability assessment of an oil reservoir, the proposed new equations (K LEAR ) have great potential for use by the oil industry, both during well-logging activities as well as laboratory analysis.

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“…Porém, a coleta e a preparação de testemunhos envolvem procedimentos de alto custo e grande demanda de tempo, limitando a obtenção de testemunhos (FILSHTINSKY; QUINN, 1983).…”

Section: Introductionunclassified

Estudo da permeabilidade de meios porosos por Ressonância Magnética Nuclear ênfase em reservatórios de petróleo

Pezzatti¹

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An operator view on trends in core acquisition

Saucier

Sincock

2022

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Core samples from the subsurface can provide unambiguous direct information to guide operator decisions. Core may be acquired with drilling equipment (full-bore core) or by post-drill wireline methods (sidewall core). Both approaches have distinct profiles of cost, risk, sample type and value, and an operator must select the most appropriate to progress business in an informed way. The option to selectively core after drilling and perceptions of lower cost and risk might indicate that sidewall coring will always be the best approach. Recent developments to increase the size and quality of rotary sidewall samples would only add weight to this view. It's not all good news for sidewall core, however. Individual sample size and total volume delivered per run are tiny; weak rock or high overbalance pressure may cause poor recovery and biased datasets; time between drilling and logging allows mud invasion and borehole relaxation so samples are often broken, and pore fluids contaminated. Sidewall sample sets therefore leave a higher degree of uncertainty when compared to full-bore core. It is this operator's view that both approaches have a role to play in reducing subsurface uncertainty, and cost, risk and value should be carefully considered when deciding which to apply.

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