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API unit

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Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-OOO
...SPWLA 59th Annual Logging Symposium, June 2-6, 2018 1 A MODEL-INDEPENDENT DEFINITION OF THE GAMMA RAY API UNIT C. Stoller, L. Xu, C. Huiszoon, Schlumberger Copyright 2018, held jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors. This paper...
Proceedings Papers

Paper presented at the CORROSION 2011, March 13–17, 2011
Paper Number: NACE-11358
... of the unit. In this paper, an overview of the flange face corrosion issue will be reviewed from the perspective of the owner/user and inspection professional. A review of the problem, inspection methodology and cost/benefit evaluations will be presented. API RP 751 provides an outline for inspection...
Journal Articles
J Can Pet Technol 15 (01).
Paper Number: PETSOC-76-01-04
Published: 01 January 1976
...F.D. Griffin With well over 250 case histories in the form of dynamometer cards taken all over the world in the last decade, it now seems appropriate to review the API recommended method of sizing a pumping unit and compare it with older methods used in the past. The dynamometer cards taken covered...
Images
These charts show borehole potassium gamma ray contributions in <b>API</b> <b>units</b> p...
Published: 30 October 2011
Fig. 5 These charts show borehole potassium gamma ray contributions in API units per weight percentage of potassium in the mud for eccentered tools ( left-hand panel) and centralized tools (right-hand) panel run in various combinations of borehole size and mud weight. More
Images
Images
<b>API</b> fracture conductivity <b>unit</b>
Published: 09 October 2017
Figure 1 API fracture conductivity unit More
Images
Field data for polishing different <b>API</b> crudes with compact flotation <b>unit</b> t...
Published: 06 December 2016
Figure 11 Field data for polishing different API crudes with compact flotation unit technology. More
Images
Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0073
... decreases with increases in fractional shale volume. In other words, if one unit of shale per unit volume produces a gamma ray intensity of 10 API units we would think it strange if 10 units of shale per unit volume produced only, say, 60 API units of gamma radiation (instead of 100). Yet...
Proceedings Papers

Paper presented at the SPE/ICoTA Coiled Tubing Roundtable, March 7–8, 2001
Paper Number: SPE-68433-MS
... to define the slurry to be used in the field. However when the initial 2 batches of cement were mixed on location, they were rejected because they were out of range for fluid loss and filter cake thickness and hardness. A target of 5 API units was used to obtain consistency needed to duplicate field...
Journal Articles
SPE Form Eval 4 (02): 231–238.
Paper Number: SPE-16556-PA
Published: 01 June 1989
... into a stratified water column, where anoxic bottom layers favored the preservation of organic matter. Kerogen is present both as silty laminae and dispersed within the sands, giving rise to high gamma radiation levels up to 120 API units. The LGRS have an average level of 50 API units, compared with 70 API units...
Journal Articles
J Pet Technol 71 (08): 52–54.
Paper Number: SPE-0819-0052-JPT
Published: 01 August 2019
... for measuring radioactivity. The chaos created by different tools providing radioactivity in different units in the same environments ended with the creation of the API unit in 1959. The definition of the unit was based on work done with the UH GR characterization pit. This specific pit has a 4.89-in. borehole...
Proceedings Papers

Paper presented at the International Oil Conference and Exhibition in Mexico, August 31–September 2, 2006
Paper Number: SPE-101718-MS
... concentrations of Thorium, Uranium and Potassium. Under different borehole conditions (mud weight, barite mud, borehole size, etc), the tools would respond differently depending on their particular sensitivity. This modeling allows us to assess the difference in API units between the LWD and Wireline gamma-ray...
Proceedings Papers

Paper presented at the SPWLA 58th Annual Logging Symposium, June 17–21, 2017
Paper Number: SPWLA-2017-FF
... ABSTRACT The API gamma ray formation maintained by the University of Houston defines the API unit to which natural gamma ray tools are calibrated. This standard has facilitated consistent measurements from a variety of tool designs and vendors. It was crucial because gross-counting natural...
Journal Articles
Petrophysics 58 (05): 485–500.
Paper Number: SPWLA-2017-v58n5a3
Published: 01 October 2017
...Gordon L. Moake The natural gamma-ray API formation maintained by the University of Houston ("UH formation") defines the API unit to which natural gamma-ray tools are calibrated. Unfortunately, the narrow borehole of the UH formation cannot accommodate logging-while-drilling (LWD) tools...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-KKK
... results. This paper proposes a new method using calibrat- ed Monte Carlo models to obtain counting rate-to- API unit sensitivity factors for new hardware de- signs by modeling their responses to thorium blan- ket calibrators. Most, if not all, service providers have thorium blanket field calibrators...
Proceedings Papers

Paper presented at the SPE International Conference on Health, Safety and Environment in Oil and Gas Exploration and Production, April 12–14, 2010
Paper Number: SPE-125661-MS
... highlighted that the JPT June 1987 paper contributed to the body of scientific literature by demonstrating the first correlation between gamma ray well logging units in API and conventional health physics radiological dose units. Prior to this health &amp; safety professionals in the oil &amp; gas industry...
Proceedings Papers

Paper presented at the SPE Saudi Arabia Section Technical Symposium and Exhibition, May 19–22, 2013
Paper Number: SPE-168099-MS
... of the development process, extensive laboratory tests were performed to validate and compare results of different types of instruments. A typical spectral gamma ray measurement on cuttings takes about 15 minutes and gives total gamma ray activity in API units, and the normal Uranium (U), Thorium (Th), and Potassium...
Journal Articles
J Pet Technol 69 (05): 61–62.
Paper Number: SPE-0517-0061-JPT
Published: 01 May 2017
... different units. For instance, the spontaneous-potential log is given in millivolts, whereas the gamma ray log is given in an API unit. 1 5 2017 1 5 2017 1 5 2017 1 5 2017 2016. Society of Petroleum Engineers Artificial Intelligence agglomerative algorithm log analysis...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, December 10–12, 2014
Paper Number: IPTC-17869-MS
... reservoirs that defy log attempts to define their character. Fig. 1 shows an example of one of these very tight reservoirs with porosity logged on a limestone matrix. The gamma ray has very little character and varies between 15 and 30 API units. Resistivity is near 100 Ohm-meters through the section...

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