Baker Hughes, a Ge Compnay, LLC

Baker Hughes Corporation

Baker Hughes Oilfield Operations LLC

Holger Tietjen

Martin Blanz

Radu Coman

Holger Thern

Mouin Hamdan

Oliver Mohnke

Martin Errenst

Yuri Vatis

Thomas Kruspe

Christoph Meyer

An example computer-implemented method for transmitting data from a downhole location to the earth's surface. The method includes sensing, with one or more sensors, sensor data downhole, the sensor data comprising a plurality of data value sets. The method further includes assigning at least one data value of each of the plurality of data value sets to each of a plurality of time levels or depth levels to generate a data block. The method further includes compressing, with a first processor in the drilling assembly, the data block by a block-based compression technique to generate compressed data. The method further includes transmitting, with a telemetry system, the compressed data from the downhole location to the surface. The method further includes decompressing, with a second processor at the surface, the compressed data to generate decompressed data values. The method further includes controlling the drilling assembly based on the decompressed data values.

Compressing data collected downhole in a wellbore

A nuclear magnetic resonance (NMR) apparatus includes a carrier configured to be deployed in a borehole, a magnet assembly configured to generate a static magnetic field in an earth formation, and at least one transmitting assembly configured to generate an oscillating magnetic field in a volume of interest within the formation. The apparatus also includes a pulse generator configured to apply a direct-echo pulse sequence to the at least one transmitting assembly, the direct-echo pulse sequence having a plurality of successive pulses including a first pulse and a second pulse configured to generate a first direct NMR echo, and a third pulse, the third pulse selected to at least partially separate a stimulated NMR echo from a second direct NMR echo occurring after the third pulse. The apparatus further includes at least one receiving assembly configured to detect the first and second direct echoes of an NMR echo train.

Magnetic resonance pulse sequences and processing

A system for measuring a property of fluid in an earth formation includes a downhole tool disposed in a borehole and configured to be movable within the borehole and a nuclear magnetic resonance (NMR) measurement device including a transmitter configured to emit at least two pulse trains of magnetic energy into the earth formation and a detector configured to detect a long-TW echo train and a short-TW echo train resulting from the at least two pulse trains. The system also includes a processor configured to combine the information from the at least two pulse trains and a rate of penetration of the downhole tool to form a measurement of the property.

Formation evaluation utilizing dual wait time nuclear magnetic resonance

An apparatus for estimating properties of an earth formation includes a nuclear magnetic resonance (NMR) measurement device including a magnet assembly, at least one transmitting assembly configured to generate an oscillating magnetic field in the formation, and a receiver configured to detect NMR signals from at least a sensitive volume in the formation. The apparatus also includes a processing device configured to receive NMR data corresponding to the detected NMR signals. The processing device is configured to perform combining a geometrical factor of the NMR logging tool with a temperature distribution, the temperature distribution indicating a temperature value at at least one location in the sensitive volume of the formation, correcting the NMR data based on the temperature value, estimating a property of the formation based on the corrected NMR data, and performing one or more aspects of an energy industry operation based on the estimated property.

Temperature correction of magnetic resonance data

A nuclear magnetic resonance (NMR) apparatus includes a transmitting assembly configured to emit one or more dual-wait-time pulse sequences, and a receiving assembly configured to detect a long-wait-time echo train and a short-wait-time echo train. The apparatus also includes a processor configured to perform at least one of: estimating a difference between the long-wait-time echo train and the short-wait-time echo train to generate a differential echo-train, inverting the differential echo-train into a differential Tdistribution, and detecting a motion artefact in response to determining that the differential echo-train includes a short-Tporosity fraction that is greater than a threshold value; and inverting two echo trains into two Tdistributions, calculating at least two porosity fractions for each of the two Tdistributions, estimating a shift of a porosity amount between the at least two porosity fractions, and detecting the motion artefact based on the shift.

Motion detection and correction of magnetic resonance data

A method for estimating a property of a subsurface material includes conveying a carrier through a borehole penetrating the subsurface material and performing an NMR measurement in a volume of interest in the subsurface material using an NMR tool having an antenna disposed at the carrier. The method further includes receiving with the antenna a short build-up signal due to a short magnetization build-up time of the NMR measurement, an echo-train signal with short polarization time due to the NMR measurement, and an echo-train signal with long polarization time due to the NMR measurement. The method further includes inverting, simultaneously, the short build-up signal, the short-polarization-time echo-train signal, and the long-polarization-time echo-train signal using a processor to estimate the property; and transmitting a signal comprising the property to a signal receiving device.

NMR T2 distribution from simultaneous T1 and T2 inversions for geologic applications

A media displacement device has a body configured to be positioned radially outwards of a tool having an antenna for transmitting electromagnetic energy to or receiving electromagnetic energy from an earth formation. The body is made of materials causing less power loss to electromagnetic energy transmitted or received by the tool than the media the body is configured to displace.

Media displacement device and method of improving transfer of electromagnetic energy between a tool and an earth formation

Method and apparatus using at least one process to reduce a data set using a data adaptive down-sampling scheme comprising a plurality of non-uniform down-sampling factors. The method may include separating the data set into a plurality of data windows, where each of the plurality of data windows corresponds to one of the plurality of non-uniform data-sampling factors; applying the down-sampling factors, and transmitting the reduced data set from a downhole location to the surface. The data set may include an NMR echo train. The apparatus may include an NMR tool configured to acquire NMR data and at least one processor configured to perform the method.

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Hannover, Germany

Holger Tietjen