What are the advantages of using NMR logging in formation evaluation?

The tool has a coil which externally produce magnetic wave and send into the formation. The magnetic nuclear spins aligned by polarization of a magnetic field (B0). The chaos of this alignment by oscillating is resulting of a pulse called T2 relaxation time. The initial amplitude of the spin-echo is proportional to the number of hydrogen nuclei in the pore fluids which is an indication of fluids inside pores. The area under T2 distribution is equal to spin nuclei amplitude and is calibrated in porosity unit. The tool use cutoff for different fluids inside pores. Different type of the NMR tools, MRIL (Haliburton), MREX (Baker) and CMR (SCHL.) use different technologies and experimental cutoffs for CBW, CBF and FF.

PoreSize Distribution: NMR provides detailed insights into reservoir rock characteristics. Fluid Typing: Enables precise differentiation and quantification of fluid types. Accurate Effective Porosity: Clay-Bound Water Detection: Mobile vs. Immobile Fluids: Distinguishes between mobile and immobile fluid fractions. Minimized Invasion Effects: Less affected by invasion effects, providing a clearer wellbore view. Quick Measurements: NMR provides efficient T1 and T2 relaxation time measurements. Quantitative Analysis: Facilitates quantitative analysis of fluid saturations and permeability. Improved Saturation Estimation: Enhances estimation of fluid saturations by directly measuring hydrogen content. High Resolution:

The NMR data interpretation provide a lot of useful outputs for petrophysicists, drilling and reservoir engineers. The NMR is the only tool can estimate porosity independent lithology. The NMR separate determined total water saturation to capillary bound fluid (CBF) and free fluid (FF). The Clay bound water effect on porosity automatically, ignored using CBW cutoff for clay. T hydrocarbon viscosity and synthetic capillary pressure can be estimated from T2. The tool does not effect by washouts and fluid type of the mud inside borehole. The NMR has wide applications in analyzing unconventional resources (Shale Oil and Shale Gas). The estimated high CBF allows to drilling engineers to perforate zones within high water saturation.

The nitrogen (N2) assisted flowback with coiled tubing (CT) widely used to improving and optimization of the well production. The second method is matrix acid stimulation using coil tubing technique specially in carbonate reservoirs. For more efficient reservoir management the production logging is critically important.

The NMR data and interpreted results help to drillers to set accurately perforation intervals, specially in thin laminate sand beds. The CBF calculated using T2 data cutoff and the fluid is bounded and immovable. The thin laminate sands have high CBF and NMR useful to estimates this parameter for perforation interval decision.

The NMR data and interpreted results help to drillers to set accurately perforation intervals, specially in thin laminate sand beds. The CBF calculated using T2 data cutoff and the fluid is bounded and immovable. The thin laminate sands have high CBF and NMR useful to estimates this parameter for perforation interval decision.

The NMR help reduce uncertainty in tarmat. The tarmat is solid and formed at the bottom of oil column above aquifer. In some reservoirs the oil viscosity increasing by depth and oil at the top of formation is mobile and at the bottom is immobile. The tarmat cut connection between aquifer and oil column and drop pressure that is effect oil production and reduce productivity..