ELIS Magnetic Resonance Tool (EMRTTM)
The Nuclear Magnetic Resonance (NMR) technology is one of the most advanced technologies in well logging today. The logging signals, which contain rich information about reservoir, come from the pore spaces of reservoir rocks, and can be used to analyze the key parameter such as the volume of free fluid, bound water, permeability and pore size distribution. During the exploration stage, the NMR logging can provide effective information of fluid properties, reservoir properties and recoverable reserves and so on for the reservoir evaluation. During the development phase, the NMR logging can provide quantitative data for evaluation and analysis of problem such as oil remains, recovery ratio and the effects of production increasement methods. It has an obvious effect with the application to the complex reservoir, the low resistivity and saturation reservoirs as well as natural gas and heavy oil reservoirs.
The ELIS Magnetic Resonance Tool (EMRTTM
) measures the hydrogen nuclei response from formation pore fluid. With static and pulsed radio frequency (RF) magnetic, the EMRTTM
makes downhole spin echo magnetic response measurements. The spin-echo trains contain allot of important information. The initial amplitude of the spin-echo train is proportional to the number of hydrogen nuclei associated with the fluids in the pores within the sensitive volume, and can be calibrated to give the porosity of the formation, and the decay rates of the spin-echo will provide information of pore size and fluid types.
Directly measures the density of hydrogen nuclei in reservoir pore movable fluid. This will quantitative analysis the volume of free fluid, bound water, permeability and pore size distribution. The mineral components of the rock skeleton will have no effect on the porosity measurement.