Numar Corporation

Halliburton Energy Services, Inc.

Geometric Data Corporation

Numalog

Melvin N Miller

Manfred G Prammer

George R Coates

John C Bouton

Duncan Mardon

Moti Huber

Sergei Knizhnik

Eugene L Leboy

Dennis L Tebbe

Charles G Masi

Reddiar S Anbalagan

Georges R Coates

A magnet assembly and a magnetic field configuration are disclosed for the generation of a magnetic field in a defined volume, with the field being homogeneous over a pre-determined portion of the volume and not homogeneous over the rest. The disclosed magnetic assembly has a plurality of spaced-apart magnets arranged in pairs. The magnets of each pair are be positioned diametrically opposite each other with respect to an enclosed volume. In different embodiments magnets may all be arranged such that their magnetization directions are substantially aligned, or could alternatively be arranged to have magnetizations pointing in different directions. The angular spacing between the magnets is selected in the range of approximately 13&#xb0;-17&#xb0; and could be as large as the size of the magnets. The assembly generates a homogeneous magnetic field within an inner portion of the defined volume, and a second magnetic field, substantially different from the homogeneous magnetic field throughout the remainder, i.e., in the periphery of the defined volume.

Apparatus and method for magnetic resonance measurements in an interior volume

A well logging system and method are disclosed for detecting the presence and estimating the quantity of gaseous and liquid hydrocarbons in the near wellbore zone. The system uses a gradient-based, multiple-frequency NMR logging tool to extract signal components characteristic for each type of hydrocarbons. To this end, a new data acquisition method is proposed in which measurements at different frequencies are interleaved to obtain, in a single logging pass, multiple data streams corresponding to different recovery times and/or diffusivity for the same spot in the formation. The resultant data streams are processed to determine mineralogy-independent water and hydrocarbon saturations and porosity estimates. Gas and oil saturations are used to obtain accurate estimates of the water content, permeability and other parameters of interest.

System and method for lithology-independent gas detection using multifrequency gradient NMR logging

A well logging system and method for detecting the presence and estimating the quantity of gaseous and liquid hydrocarbons in the near wellbore zone. The system uses a gradient-based, multiple-frequency NMR logging tool to extract signal components characteristic for each type of hydrocarbons. To this end, a new data acquisition method is proposed in which measurements at different frequencies are interleaved to obtain, in a single logging pass, multiple data streams corresponding to different recovery times and/or diffusivity for the same spot in the formation. The resultant data streams are processed to determine mineralogy-independent water and hydrocarbon saturations and porosity estimates. Gas and oil saturations are used to obtain accurate estimates of the water content, permeability and other parameters of interest.

System and method for lithology-independent gas detection using

A method for measuring or predicting a property of a porous material while curing, the porous material including therein a liquid which undergoes metamorphosis and which is present in the porous material in different phases during curing, the method including the steps of performing a low frequency, spin-echo nuclear magnetic resonance (NMR) measurement of each phase of the liquid, and correlating the NMR measurement, or extrapolating the property, in accordance with a predetermined relationship between the property and the NMR measurement.

NMR concrete analysis

An improved system for using nuclear magnetic resonance techniques to obtain information relating to geologic structures. The system of the present invention employs a variable sampling window which increases sampling efficiency by allowing the system to optimize the sampling interval, thereby maximizing the amount of data which can be obtained in a series of data samples.

Nuclear magnetic resonance detection of geologic structures

Nuclear magnetic resonance well logging apparatus and a method of use for geophysical examination of a bore hole as the bore hole is drilled. The apparatus is connected to the drill bit to follow it through the bore hole as the bore hole is formed. The apparatus comprises a resilient, tubular, permanent magnet for generating a static magnetic field in the region of a portion of the bore hole adjacent the apparatus, which region includes materials sought to be analyzed, an antenna mounted on the magnet and connected to associated circuitry for exciting nuclei of the materials sought to be analyzed in the region, and a receiver connected to the antenna for receiving nuclear magnetic resonance signals from the excited nuclei and for providing an output signal indicative of properties of the materials sought to be analyzed.

System for logging a well during the drilling thereof

A magnetic structure for producing a substantially uniform magnetic field in a region external to the structure. The field produced has a predetermined magnitude but with all of its first and second order partial derivatives with respect to spatial coordinates being equal to zero at any selected point within the uniform region. The structure includes a pair of elongated magnets which are magnetized along their longitudinal axis. The magnets are spaced from each other with their corresponding end poles facing each other. A pair of annular cylindrical magnets which are magnetized in a radial direction are mounted on the end faces of each of the elongated magnets. Another annular cylindrical magnet, also having its magnetization oriented in a radial direction is located on the midplane between the two elongated magnets. The combined effect of these magnets is to create a uniform toroidal field. This field is particularly suitable for use in NMR oil well logging applications.

NMR magnet system for well logging

A system is disclosed for generating a maturity index for blood cells which may be used in a hematology profile to show the health of a patient. The system includes a scanning system for scanning a cell, pattern recognition means connected to the scanning means for generating a plurality of groups of signals, each group representative of a different characteristic of the cell scanned, and calculation means responsive to the signals for calculating an index of maturity for the cell scanned in accordance with its characteristics.

Growing community of inventors

Wynnewood, PA, United States of America

Melvin N Miller