The Gullfaks Field Development: Challenges and Perspectives

Tollefsen, Svein; Graue, Eirik; Svinddal, Stein

doi:10.2118/25054-ms

Cited by 13 publications

(3 citation statements)

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“…Nearshore‐marine and deltaic sandstones of the Middle Jurassic Brent Group constitute the main reservoirs of Gullfaks Field (Figs 1–4; Eriksen et al ., 1987; Petterson et al ., 1990, 1992; Olaussen et al ., 1992; Tollefsen et al ., 1992). The Brent Group comprises five formations, the upper four of which have been sampled in the present study (Fig.…”

Section: Introductionmentioning

confidence: 99%

Plagioclase dissolution related to biodegradation of oil in Brent Group sandstones (Middle Jurassic) of Gullfaks Field, northern North Sea

Ehrenberg

Jakobsen

2001

Sedimentology

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Brent Group sandstones from the north side of the Gullfaks Oilfield contain mostly 5–8% albitic plagioclase, whereas plagioclase is almost absent in the same strata in the southern part of the field. Absence of plagioclase throughout the entire vertical extent of the Brent Group in the southern wells seems to rule out provenance as the principal explanation for differing plagioclase content, which is therefore interpreted as the result of diagenesis. Hypotheses for the nature of the inferred leaching event include epigenetic meteoric diagenesis and mesogenetic release of acid components from clay minerals or kerogen, but these explanations are unable to account for the observed spatial distribution of the plagioclase‐bearing and plagioclase‐free sandstone intervals. However, overall correspondence between the area lacking plagioclase and oil compositions having both anomalously high CO2 and organic geochemical indications of advanced biodegradation suggest a link between plagioclase dissolution and biodegradation of the present oil column. It is, therefore, proposed that acid components from biodegradation selectively reacted with albitic plagioclase to form kaolin, releasing sodium bicarbonate into the residual water. The plagioclase‐free sandstones contain more kaolin than the plagioclase‐bearing sandstones, as would be expected due to aluminium conservation. However, the wide and overlapping ranges of kaolin content in both groups suggest that most of the kaolin originated from processes other than biodegradation‐driven plagioclase alteration, potentially including both epigenetic and mesogenetic dissolution, as well as deposition of detrital kaolin and kaolin precursors.

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Section: Introductionmentioning

confidence: 99%

Plagioclase dissolution related to biodegradation of oil in Brent Group sandstones (Middle Jurassic) of Gullfaks Field, northern North Sea

Ehrenberg

Jakobsen

2001

Sedimentology

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“…The Gullfaks field is one of Norway's largest oil fields located in block 34/10 along the western flank of the Viking Graben in the northern North Sea [1][2][3]. It is a structural complex with reservoirs in several strata, fragmented by numerous faults [4][5][6]. It was discovered in 1978 in the Tampen region of the North Sea; it was put into production in 1986 and reached peak production in 2001 [7][8][9].…”

Section: -Introductionmentioning

confidence: 99%

“…As soon as the Gullfaks field began production in 1986, a drop in production was noticed due to the depletion of the reservoir. After primary and secondary recovery carried out, it was observed that the reservoir still contained a considerable amount of hydrocarbons that could be exploited [5][6][7]. This made it possible to use assisted recovery techniques.…”

Section: -Introductionmentioning

confidence: 99%

Improving the Recovery of Hydrocarbons in a Well in the Gullfaks Field by Injecting Sequestrated CO2

Chamgoué

Kombou²,

Ngankap

et al. 2023

IJCPE

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The Gullfaks field was discovered in 1978 in the Tampen area of the North Sea and it is one of the largest Norwegian oil fields located in Block 34/10 along the western flank of the Viking Graben in the northern North Sea. The Gullfaks field came on stream in 1986 and reached a peak of production in 2001. After some years, a decrease in production was noticed due to the decrease in pressure in the well. The goal of this paper is to improve the production of a well located in Gullfaks field by injecting CO2 through coiled tubing. The use of the CO2 injection method is due to the fact that it is a greenhouse gas, and its production in the atmosphere contributes to global warming. It is important to reduce its emission into the atmosphere and to boost the production of oil in the well. The CO2 is injected through the coil tubing to lighten the hydrostatic column and allow the fluid to move from the tubing to the surface. The completion and PVT data are processed in Pipesim and Prosper softwares. By integrating a number of calculations by using the nodal analysis methods and gas injection methods, the results obtained show that the well is not producing and by injecting sequestrated CO2 at the flow rate of 1.482 MMScft/d with an injection pressure of 2500 psig, the oil flow rate provided by the coiled tubing gas injection is 900 Stb/d. The profitability of the project is achieved over a period of 20 years with a net present value (NPV) of $11948858.5 and a return on investment after 5 years 2 weeks.

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Part 4: Compositional variations of North Sea formation waters

Warren

Smalley

Howarth

1994

Memoirs

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A total of 236 individual water analyses from over 70 fields in the North Sea and Norwegian Haltenbanken area were provided by field operators or collated from the literature (Table 4.1). All the data from the field operators were supplied as representative analyses of the formation water for that field. Most of the analyses supplied were routine ten ion analyses with accompanying data on sample type, water resistivity and reservoir conditions. Where these accompanying data were not supplied but were available from other sources, they have been added to the original contribution. Previously published formation water analyses have also been included with accompanying data where available.Minor ions, such as bromide and lithium, trace metals, organic species such as acetate, and isotopic data were seldom reported. Consequently, maps and figures have only been constructed of the major cations, anions, total dissolved solids and Rw.All users of the water data compiled here should be aware of possible variations in data quality. There are a number of concerns, most notably the chemical analysis method, sampling artifacts and sample contamination.The majority of the chemical analyses of formation waters compiled were not performed by the North Sea field operators themselves, but were produced under contract by a number of service companies. Although routine laboratory methods were used to obtain the data reported here, different methods have been used between laboratories and over time due to improved instrumentation and analytical methods over the last 25 years of oil and gas production from the

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The Gullfaks Field Development: Challenges and Perspectives

Cited by 13 publications

References 1 publication

Plagioclase dissolution related to biodegradation of oil in Brent Group sandstones (Middle Jurassic) of Gullfaks Field, northern North Sea

Plagioclase dissolution related to biodegradation of oil in Brent Group sandstones (Middle Jurassic) of Gullfaks Field, northern North Sea

Improving the Recovery of Hydrocarbons in a Well in the Gullfaks Field by Injecting Sequestrated CO2

Part 4: Compositional variations of North Sea formation waters

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