Abstract
Nuclear Magnetic Resonance mud logging technology (NMR mud logging) is a new mud logging technology. Mainly applies the CPMG(Carr-Purcell-Meiboom-Gill)pulse sequence to measure transverse relaxation time (T2) of the fluid. NMR mud logging can measure drill cutting, core and sidewall core in the well site, also according to the experiment results, the sample type and size has little effect to analysis result. Through NMR logging, we can obtain several petrophysical parameters such as total porosity, effective porosity, permeability, oil saturation, water saturation, movable fluid saturation, movable oil saturation, movable water saturation, irreducible fluid saturation, irreducible oil saturation, irreducible water saturation, pore size and distribution in rock samples, etc. NMR mud logging has been used nearly 10 years in China, Sudan, Kazakhstan, etc. it plays an important role in the interpretation and evaluation of reservoir and its fluids.
Highlights
Faster drilling speed and higher drilling cost dictate reducing cost and decreasing the time for reservoir evaluation
NMR mud logging has been used nearly 10 years in China, Sudan, Kazakhstan, etc. it plays an important role in the interpretation and evaluation of reservoir and its fluids
In order to get these petrophysical parameters of the reservoir, we usually analyze the core samples in the laboratory, but that need a long period and cost a lot
Summary
Faster drilling speed and higher drilling cost (especially offshore) dictate reducing cost and decreasing the time for reservoir evaluation. NMR mud logging technology utilizes hydrogen atomic nucleus (1H) rich in the formation fluid (oil, gas and water) to obtain the petrophysical parameter such as the porosity, permeability, fluid saturation, fluid property, movable fluid and irreducible fluid [1,2,3,4]. This technology has been widely applied to the evaluation of reservoir and its fluids.
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