Neutron-Excited Gamma-Ray Spectrometry for Well Logging

Hertzog, R.C.; Plasek, R.E.

doi:10.1109/tns.1979.4330439

Cited by 38 publications

(12 citation statements)

References 7 publications

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“…Note that the form of equation 3 is similar to that used by Hertzog and Plasek (1979) and Roscoe and Grau (1988), but the coefficients were obtained differently. C m = 0 in sandstone.…”

Section: Oil Saturation From Modern C/o Logsmentioning

confidence: 99%

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Vertical Sweep Evaluation in the Lost Hills Diatomite Waterflood Using Carbon/Oxygen Logs

Badruzzaman¹,

Morea²,

Julander³

2007

Proceedings of SPE Annual Technical Conference and Exhibition

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fax 01-972-952-9435. AbstractWe discuss our experience to date with the Carbon/Oxygen logging technique to determine vertical sweep in Belridge Diatomite in the Lost Hills Field. We describe early interpretation challenges with overly optimistic saturation estimation. This required in-house Monte Carlo modeling to understand the tool response in very high porosity reservoirs. A newer vendor algorithm, however, underestimated the oil saturation. In-house test algorithms were then developed with significantly more accurate estimation of the oil saturation from a centralized-detector C/O tool in water-filled boreholes; results reported here are primarily for this tool. The C/O technique is also being tested in producers using the corresponding focused tool; we include an example of a successful test of the tool in an uperforated well. The paper identifies further development needed to use C/O techniques, especially the focused tool, optimally in either monitor or producer wells in diatomite.

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“…Note that the form of equation 3 is similar to that used by Hertzog and Plasek (1979) and Roscoe and Grau (1988), but the coefficients were obtained differently. C m = 0 in sandstone.…”

Section: Oil Saturation From Modern C/o Logsmentioning

confidence: 99%

“…Ostermeier (1993) conducted tests with an older C/O tool (Hertzog and Plasek, 1979;Roscoe and Grau, 1988) in diatomite in the nearby South Belridge Field. However, C/O technology has been slow to mature in the field due to erroneous oil saturation predictions when compared to core or openhole log saturations.…”

Section: Introductionmentioning

confidence: 99%

Vertical Sweep Evaluation in the Lost Hills Diatomite Waterflood Using Carbon/Oxygen Logs

Badruzzaman¹,

Morea²,

Julander³

2007

Proceedings of SPE Annual Technical Conference and Exhibition

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“…Neutron sources have many applications including well logging and active interrogation systems [2]- [7]. In well logging, a neutron source is used to locate and monitor rock density and porosity in geological formations [2], [3]. In neutron active interrogation systems, neutrons are used to cause measurable radioactive disintegration products [3]- [7].…”

Section: Introductionmentioning

confidence: 99%

“…In well logging, a neutron source is used to locate and monitor rock density and porosity in geological formations [2], [3]. In neutron active interrogation systems, neutrons are used to cause measurable radioactive disintegration products [3]- [7]. Neutrons for these compact applications commonly come from either radioisotope or sealed tube neutron generators [8].…”

Section: Introductionmentioning

confidence: 99%

“…Neutrons can be produced in sealed tube generators through the deuteriumdeuterium [D(d,n) 3 He] reaction when a beam of deuterium Manuscript ions impacts a target containing deuterium [5], [7], [8]. Plasma ion sources, such as Penning, electron cyclotron resonance, and vacuum ion sources, are commonly used as ion beams for this purpose [12], [13].…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen and Deuterium Ion Extraction From a Piezoelectric Transformer Plasma Source

Baxter

Kovaleski

Gall

et al. 2014

IEEE Trans. Plasma Sci.

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A piezoelectric transformer plasma source (PTPS) has been developed as a plasma ion source for D(d,n) 3 He neutron production. This neutron production system is compact, radioisotope free, and can be easily turned ON and OFF. The PTPS consists of a lithium niobate piezoelectric disk in a differentially pumped chamber with controlled gas flow from an external source. The PTPS was previously characterized using a range of gas flows, extraction voltages, and aperture geometries to demonstrate its capabilities as an ion source. Ion current measurements are presented for deuterium and hydrogen gas at PTPS pressures from 1.5 to 8.5 torr, RF driving voltages from 200 to 400 V, and extraction voltages up to 2000 V. Ion current yields on the order of 10 µA were measured.

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