General Electric Company

Schlumberger Technology Corporation

Baker Hughes Holdings LLC

Kevin Scott McKinny

Matthew Thomas McPheeters

Cornelis Huiszoon

Libai Xu

Christian Stoller

Edward Joseph Baus

Christopher Freeman

Matthew Steinhart

Matthew Mcpheeters

Casey Hale

Jonas Burke

A photomultiplier includes a housing including a proximal end and a distal end, an optical window disposed at the proximal end of the housing, an end-wall plate disposed at the distal end of the housing, a feedthrough that penetrates through the end-wall plate, and a gas electron multiplier (GEM) board disposed between the optical window and the end-wall plate.

Gas electron multiplier board photomultiplier

An arrangement for detecting neutrons. In an aspect, the arrangement includes a first neutron detector including a neutron-sensitive substance, and the first neutron detector having an associated gain performance. The arrangement includes a second neutron detector including neutron-sensitive substance, and the second neutron detector having an associated gain performance. The gain performance of the second neutron detector matching the gain performance of the first neutron detector. In an aspect, the arrangement includes a first neutron detector including at least some helium. The arrangement includes a second neutron detector including at least some helium and at least some Boron-10.

Method for gain matching neutron detectors containing various He&#x2014;3 partial pressures

A detector arrangement for detecting at least one of rays, ions and particles includes a plurality of detectors. Each detector has a respective anode output and the detectors are arranged with the respective anode outputs being in an electrical series. The arrangement includes a plurality of resistive elements interspersed in the electrical series. The arrangement includes a first measurement point at a first end of the electrical series and a second measurement point at a second end of the electrical series. The arrangement includes electrical circuitry, electrically connected to the first and second measurement points for receiving electrical signals/pulses from the first and second measurement points, and for using the electrical signals/pulses from the first and second measurement points to determine which of the plurality of detectors made the detection utilizing a division of charge that exists between the first and second measurement points.

Method for simultaneously measuring the individual outputs of particle detectors in an array using charge division electronics

An arrangement for detecting neutrons. A first neutron detector includes at least some helium, and may include some Helium-3. The first neutron detector has an associated gain performance. A second neutron detector includes at least some helium. The second neutron detector may include some Helium-3 and may include some Helium-4. The second neutron detector has an associated gain performance. In an aspect, the gain performance of the second neutron detector matches the gain performance of the first neutron detector. In an aspect, the amount of all helium of the second detector is the same as the amount of all helium in the first detector. In an aspect, at least one of the first and second detectors includes at least some additional, different neutron-sensitive substance. In an aspect, at least one of the first and second detectors includes some Boron-10 as the additional, different neutron-sensitive substance.

Method for gain matching neutron detectors containing various He-3 partial pressures

A radiation detection assembly that includes an ionization chamber having a cathode and an anode. The ionization chamber detects radiation that passes into the ionization chamber. The assembly includes an exterior enclosure defining a hollow internal volume within which the ionization chamber is enclosed. The exterior enclosure includes at least two layers. At least one of the layers provides an electromagnetic shield to the hollow internal volume and the ionization chamber enclosed therein.

Ion chamber enclosure material to increase gamma radiation sensitivity

An arrangement for detecting neutrons. The arrangement includes a first detector including helium that includes at least some Helium-3. The arrangement includes a second detector including helium that includes at least some Helium-4. The amount of all helium of the second detector is the same as the amount of all helium in the first detector. An associated method for providing the arrangement.

A detector arrangement for detecting at least one of rays, ions and particles includes a plurality of detectors. Each detector has a respective anode output and the detectors are arranged with the respective anode outputs being in an electrical series. The arrangement includes a plurality of resistive elements interspersed in the electrical series. The arrangement includes a first measurement point at a first end of the electrical series and a second measurement point at a second end of the electrical series. The arrangement includes electrical circuitry, electrically connected to the first and second measurement points for receiving electrical signals/pulses from the first and second measurement points, and for using the electrical signals/pulses from the first and second measurement points to determine which of the plurality of detectors has detected the at least one of rays, ions and particles.

A method for determining a bulk formation density using a neutron generator includes detected secondary gamma rays and evaluating the detected gamma rays according to pre-determined selection criteria. Selected gamma rays are then used to compute the formation density. The selection criteria may include, for example, a time delay between the detection of a neutron and an associated particle and/or a direction of propagation of the neutron.

Method for measuring subterranean formation density using a neutron generator

A neutron logging tool includes a neutron source and at least one position sensitive thermal or epithermal neutron detector. The logging tool further includes an electronic controller configured to estimate the axial location of detected neutrons. Measurement of the axial neutron flux distribution enables other formation and borehole parameters such as formation porosity and sensor standoff to be computed. In logging while drilling embodiments, a borehole caliper may also be computed form the axial neutron flux distribution.

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Hudson, OH, United States of America

Kevin Scott McKinny