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HPHT wells

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Journal Article
Published: 07 February 2020
Petroleum Geoscience (2021) 27 (1): petgeo2019-081.
...Daniel Atkin; Manuel Vieira; Ben Taylor Abstract X-ray fluorescence (XRF) data from a series of high-pressure–high-temperature (HPHT) wells drilled in the Shearwater Field, UK Continental Shelf (UKCS) are presented. These data comprise a total of 789 samples across a series of eight study wells...
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UV-visible-NIR absorption spectra collected at 77 K for <span class="search-highlight">HPHT</span> diamonds revea...
Published: 01 July 2022
Figure 37. UV-visible-NIR absorption spectra collected at 77 K for HPHT diamonds reveal the defects responsible for their color. ( a ) This 1.25 ct Fancy Vivid orange yellow diamond is colored by isolated nitrogen, producing strong absorption at wavelengths below 350 nm. ( b ) This 0.30 ct Fancy
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Strain birefringence patterns produced when viewing a diamond sample betwee...
Published: 01 July 2022
Figure 34. Strain birefringence patterns produced when viewing a diamond sample between crossed polarizing filters can help alert the operator of potential HPHT diamonds. Natural diamonds [( a ) and ( b )], as well as those grown by CVD methods (see Fig. 38 ), show a range of patterns including
Series: Geological Society, London, Memoirs
Published: 30 October 2020
DOI: 10.1144/M52-2019-26
EISBN: 9781786205070
... is located in the northeastern part of the central graben HPHT domain as described by Winefield et al. (2005 ). The basin evolution and regional geology of this HPHT domain has been well described ( Evans et al. 2003 ) as well as the exploration history of the HPHT plays ( Erratt et al. 2005 ), so...
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Carbon phase diagram as a function of pressure and temperature, illustratin...
Published: 01 July 2022
Figure 1. Carbon phase diagram as a function of pressure and temperature, illustrating the conditions for natural diamond formation in the lithosphere as well as those for laboratory-grown diamonds synthesized by chemical vapor deposition (CVD) and high pressure, high temperature (HPHT) methods
Series: Geological Society, London, Petroleum Geology Conference Series
Published: 01 January 2005
DOI: 10.1144/0061301
EISBN: 9781862394124
... exploration in the deep, high-pressure, high-temperature (HPHT) section of the Central North Sea (CNS) depends largely on our ability to predict more accurately the distribution, type and composition ofhydrocarbons in orderto locate more optimally what have become some of the world’s most expensive wells...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/PGC8.36
EISBN: 9781786203151
... via the Forties Pipeline System. The development focused on the recovery of hydrocarbons from the main reservoir interval, the Upper Jurassic Fulmar, with five production wells drilled prior to production start-up due to uncertainty on the ability to re-drill wells in a depleted HPHT setting...
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Journal Article
Journal: Elements
Published: 01 March 2005
Elements (2005) 1 (2): 101–104.
..., the recognition of HPHT-treated diamonds involves the determination of various visual properties (such as color and features seen under magnification), as well as characterization by several spectroscopic techniques. HPHT-treated diamonds were introduced into the jewelry trade in the late 1990s, and despite...
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Journal Article
Published: 01 July 2022
Reviews in Mineralogy and Geochemistry (2022) 88 (1): 689–753.
...Figure 37. UV-visible-NIR absorption spectra collected at 77 K for HPHT diamonds reveal the defects responsible for their color. ( a ) This 1.25 ct Fancy Vivid orange yellow diamond is colored by isolated nitrogen, producing strong absorption at wavelengths below 350 nm. ( b ) This 0.30 ct Fancy...
FIGURES | View All (42)
Journal Article
Published: 01 February 2005
American Mineralogist (2005) 90 (2-3): 428–440.
...Joachim Lindblom; Jorma Hölsä; Heikki Papunen; Heikki Häkkänen Abstract The optically active defects in as-grown, high-pressure high-temperature-treated (HPHT), boron-doped, and synthetic diamonds (SD) grown with a nitrogen-getter, as well as of natural diamonds (ND), were characterized...
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Series: Geological Society, London, Memoirs
Published: 30 October 2020
DOI: 10.1144/M52-2018-63
EISBN: 9781786205070
.... 4 ). This allowed preservation of the infrastructure until infill wells could be planned and executed to target the remaining HPHT volumes at Shearwater. As the satellites mature and reach high recoveries (up to 79% at Scoter), challenges emerge in maintaining production and maximizing the use...
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Series: Geological Society, London, Memoirs
Published: 30 October 2020
DOI: 10.1144/M52-2019-28
EISBN: 9781786205070
... undeveloped reservoirs and near-field exploration targets, based on the lessons learned during the initial development campaign, resulting in concurrent production from all discovered reservoirs via six active production wells by 2018. The Shearwater Field is a high-pressure and high-temperature (HPHT...
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Journal Article
Published: 01 November 2012
Petroleum Geoscience (2012) 18 (4): 371–372.
... with the improving seismic imaging and ability to drill high-pressure, high-temperature (HPHT) wells. However, it is not short of challenges: the gas/condensate ratio (CGR) remains difficult to predict; the reservoirs are often highly compartmentalized and will be expensive to produce, and the well costs for HPHT...
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Molecular composition (mol%) of natural gases in the <span class="search-highlight">HPHT</span> area. Most gases ...
Published: 01 November 2004
Figure 19 Molecular composition (mol%) of natural gases in the HPHT area. Most gases in quadrants 22 and 29 have similar methane and wet-gas compositions, whereas some gases in quadrant 30 are drier. The latter has been correlated to generation from source rocks with a predominance of terrigenous
Journal Article
Published: 01 July 2022
Reviews in Mineralogy and Geochemistry (2022) 88 (1): 637–688.
... that produce yellow color (and sometimes a green luminescence overtone as well) ( Collins et al. 2000 ). H4 centers—produced at lower temperatures (around 800 °C) when vacancies are trapped at B centers—are not stable at HPHT conditions. H4 centers do not form during HPHT treatment even in diamonds containing...
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Series: Geological Society, London, Special Publications
Published: 01 January 2018
DOI: 10.1144/PGC8.4
EISBN: 9781786203151
... psia bubble point). The field is borderline HPHT, with an initial pressure of 9474 psia at −3822 m TVDSS and a reservoir temperature of 143°C. In 2006, the accumulation was further appraised by well 22/6a-15. This was drilled in the east of the field in a downdip location in an attempt to constrain...
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Series: Geological Society, London, Petroleum Geology Conference Series
Published: 01 January 2005
DOI: 10.1144/0060253
EISBN: 9781862394124
... psi blow-out prevention stack. This paper will deal with those areas of the CNS with a surface to reservoir pressure gradient in excess of 0.8 psi/foot. In the area covered by this paper (Quads 21, 22, 23, 29 and 30), 227 HPHT exploration and appraisal wells have been drilled, of which 112 are more...
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Series: Geological Society, London, Petroleum Geology Conference Series
Published: 01 January 2010
DOI: 10.1144/0070225
EISBN: 9781862394131
... NW of the Joanne salt pillow. The primary reservoir is Triassic in age and consists of stacked fluvial sandstones of the Joanne Member of the Skagerrak Formation. The HPHT exploration wells 30/06-6 and geological sidetrack 30/06-6Z discovered a rich gas condensate column of 2300 ft, some 1100 ft...
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Series: Geological Society, London, Memoirs
Published: 01 January 2003
DOI: 10.1144/GSL.MEM.2003.020.01.26
EISBN: 9781862393950
... at marginal rates from Upper Jurassic Brae Formation sandstones. Subsequent appraisal well 16/8a-4 (1984) tested gas/condensate from better quality Brae Formation sandstone reservoirs. This well also discovered the deeper Middle Jurassic Heather Formation sandstone gas/condensate accumulation at near-HPHT...
Book Chapter

Author(s)
G. Goffey
Series: Geological Society, London, Petroleum Geology Conference Series
Published: 01 January 2010
DOI: 10.1144/0070031
EISBN: 9781862394131
... after four decades include small pool and high pressure high temperature (HPHT) exploration, late-stage field exploitation and field redevelopment. The rich subsurface datasets and pioneering of emerging technologies provide a stream of valuable models, lessons, techniques and ideas which have both...