1. Introduction
Ekofisk Oil Field is the North Sea’s first giant oil field which was discovered by Philips Petroleum in 1969 and approved for development in 1972. Ekofisk oil field is an oil field in block 2/4 which located at the Norwegian Continental Shelf of the North Sea (Figure 1.1). The total recoverable reserves of Ekofisk Oil field originally were 3, 324.2 million bbl oil, 156.1 bn ccm gas and 14.5 million tonnes of NGL. As of December 2012, the remaining recoverable reserves are approximately 129 million cubic meters. Figure 1. 1 Ekofisk are which located in Norway (Source : Norwegian Petroleum Museum, 2011) Figure 1. 2 Map showing the location of Ekofisk oil field and other fields. (Source : Norwegian Petroleum Museum, 2011)
The …show more content…
Then, Phillip Petroleum decided to drill other exploration well. The well 2/4-2 which before known as well 2/4-1AX, was started drilling near blow out 2/4-1 well with the same drilling rig, drilling supervisor and well site geologist. These two wells (well 2/4-1 and well 2/4-2) were located one kilometre from each other (Carstens H., 2011).
The drilling was continued for more than a month, and the well did not found any oil under high pressure at shallow depth as the first well had done. The shaly limestones that was containing full of oil were just not there in the second well on that anticlinal structure. The second well was drilled outside the seismic anomaly differs with the first well which was drilled right into seismic anomaly. That is why the oil was not found in Upper Tertiary section (Carstens H., 2011).
The oil was discovered after 38 days of drilling. The well penetrated the Danian Chalk which later named as Ekofisk Formation which the thickest and most porous. The cores took from the reservoir were porous but it appeared to have poor permeability. However, there were some small fractures in the reservoir which overcome the poor permeability. Following the drilling of the three appraisal wells, the Ekofisk structure was still not fully understood (Carstens H., 2011).
2.2 Development and
Ekofisk Oil Field is the North Sea’s first giant oil field which was discovered by Philips Petroleum in 1969 and approved for development in 1972. Ekofisk oil field is an oil field in block 2/4 which located at the Norwegian Continental Shelf of the North Sea (Figure 1.1). The total recoverable reserves of Ekofisk Oil field originally were 3, 324.2 million bbl oil, 156.1 bn ccm gas and 14.5 million tonnes of NGL. As of December 2012, the remaining recoverable reserves are approximately 129 million cubic meters. Figure 1. 1 Ekofisk are which located in Norway (Source : Norwegian Petroleum Museum, 2011) Figure 1. 2 Map showing the location of Ekofisk oil field and other fields. (Source : Norwegian Petroleum Museum, 2011)
The …show more content…
Then, Phillip Petroleum decided to drill other exploration well. The well 2/4-2 which before known as well 2/4-1AX, was started drilling near blow out 2/4-1 well with the same drilling rig, drilling supervisor and well site geologist. These two wells (well 2/4-1 and well 2/4-2) were located one kilometre from each other (Carstens H., 2011).
The drilling was continued for more than a month, and the well did not found any oil under high pressure at shallow depth as the first well had done. The shaly limestones that was containing full of oil were just not there in the second well on that anticlinal structure. The second well was drilled outside the seismic anomaly differs with the first well which was drilled right into seismic anomaly. That is why the oil was not found in Upper Tertiary section (Carstens H., 2011).
The oil was discovered after 38 days of drilling. The well penetrated the Danian Chalk which later named as Ekofisk Formation which the thickest and most porous. The cores took from the reservoir were porous but it appeared to have poor permeability. However, there were some small fractures in the reservoir which overcome the poor permeability. Following the drilling of the three appraisal wells, the Ekofisk structure was still not fully understood (Carstens H., 2011).
2.2 Development and