Diffusion coefficient measurements for moving samples under strong magnetic field gradients.

Among the numerous measurements carried out during a well-logging procedure, the Nuclear Magnetic Resonance (NMR) assessment is one of the fundamental analyses in determining the economic viability of a well for the oil industry. Nowadays, two reliable approaches, Wireline Logging (WL) and Logging While Drilling (LWD), stand out. WL comprises the acquisition of NMR data under static conditions.

Transverse relaxation measurements for moving samples in the presence of strong magnetic field gradients.

Nuclear Magnetic Resonance (NMR) is one of the primary techniques used in the oil industry for logging operations and in the laboratory environment to study rock formations due to its reliability in offering a reliable estimation of oil well productivity. Two types of well-logging operations exist, Wireline Logging and Logging While Drilling (LWD). Wireline Logging involves NMR measurements taken under static conditions.

B -gradient-based MRI using frequency-modulated Rabi-encoded echoes.

Purpose: Reduce expense and increase accessibility of MRI by eliminating pulsed field (B ) gradient hardware.

Methods: A radiofrequency imaging method is described that enables spatial encoding without B gradients. This method, herein referred to as frequency-modulated Rabi-encoded echoes (FREE), utilizes adiabatic full passage pulses and a gradient in the RF field (B ) to produce spatially dependent phase modulation, equivalent to conventional phase encoding.

A benchtop single-sided magnet with NMR well-logging tool specifications - Examples of application.

This article was written in honor of Prof. Bernhard Blümich, who has heavily impacted many areas of Magnetic Resonance and, in particular, low-field and portable NMR with numerous advances, concepts, innovations, and applications of this impressive technology. Many years ago, we decided to research and develop single-sided magnets for the area of petroleum science and engineering to study oil reservoir rocks in the laboratory under well-logging conditions.