Risk Assessment of Production and Storage Tankers

1996 ◽  
Vol 118 (3) ◽  
pp. 198-203
Author(s):  
J. E. Vinnem ◽  
S. Haugen ◽  
R. Bo̸rresen
Keyword(s):  
Oil And Gas ◽  
Feasible Solution ◽  
System Protection ◽  
The North ◽  
Oil And Gas Fields ◽  
The North Sea ◽  
Safety Features ◽  
Favorable Safety ◽  
Gas Fields ◽  
And Storage

Production and storage tankers are being evaluated extensively for development of marginal oil and gas fields in the North Sea. The main safety aspects of these vessels are discussed, based on a number of quantitative risk assessments for these vessel concepts. These studies have confirmed the importance of several important safety features, such as a fire-protected, enclosed escape way along one of the sides of the ship. Other important safety features include weather-vaning capability as a function of the turret location, location and configuration of the flare system, protection of cargo tanks by inert gas blanketing, as well as procedures for strict control of tank intervention. The results, show that the production and storage vessels have favorable safety characteristics, and that these concepts represent an acceptable and feasible solution for the marginal fields.

A contribution to the petrophysical knowledge of the Lourinhã Formation as an analogue for the Statfjord Formation in the North Sea oil and gas fields

2020 ◽  
Vol 27 (1) ◽  
pp. petgeo2019-132
Author(s):  
Marco Ludovico-Marques
Keyword(s):  
North Sea ◽  
Oil Recovery ◽  
Oil And Gas ◽  
Effective Porosity ◽  
Average Value ◽  
The North ◽  
Oil And Gas Fields ◽  
The North Sea ◽  
Northern North Sea ◽  
Gas Fields

The Lourinhã Formation in the western region of Portugal is an analogue for the Statfjord Formation in the oil and gas fields of the Norwegian Northern North Sea. This petrophysics study encompasses a specific sandstone variety (M variety) of the Lourinhã Formation. This lithic arkose shows an average value of effective porosity of 18.5% and a permeability range of 20–30 mD, and is representative of the distribution range in the petrophysics models of the reservoirs of the Statfjord Formation. The petrographical, physical and mechanical characterization of the M variety sandstone is compared with the main features of the oil- and gas-producing sandstones of the Statfjord Formation in a reference well in the Norwegian Northern North Sea. Efficient enhanced oil recovery (EOR) projects in the oil and gas fields of the Norwegian Gullfaks hub are always needed, and this study intends to provide a contribution to that endeavour.

Environmental Effect on Fatigue Life of FPSO Hull Structures

2009 ◽  
Author(s):  
Xiaozhi Wang ◽  
Booki Kim ◽  
Yanming Zhang ◽  
Ping Liao
Keyword(s):  
Oil And Gas ◽  
Low Cycle Fatigue ◽  
Oil And Gas Fields ◽  
Analysis Methodology ◽  
Work Area ◽  
Wave Conditions ◽  
Offshore Oil And Gas ◽  
Gas Fields ◽  
Offshore Oil ◽  
And Storage

Floating production, storage and offloading systems (FPSOs) have been widely used in the development of offshore oil and gas fields because of their many attractive features. These features include a large work area and storage capacity, mobility (if desired), relatively low construction cost and good stability. They are mostly ship shaped, either converted from existing tankers or purpose built. The hull structural scantling design for tankers may be applicable to FPSOs; however, FPSOs have their own unique characteristics. FPSOs are located at specific locations with a dynamic loading that is quite different from that arising from unrestricted ocean service conditions for tankers. It is also noted that the wave conditions in recent FPSO applications may be very complicated when operating in areas such as those offshore West Africa and offshore Brazil where both seas and swells exist and propagate in different directions. In this paper, the unique FPSO operational aspects, especially the load assessment due to on-site environments will be described. The methodology of handling complicated wave conditions in fatigue assessment will be addressed. Special considerations for converted FPSOs, which need to take into account their operational history as a trading tanker and low cycle fatigue due to FPSO operations, will also be introduced. Case studies will be presented and appropriate analysis methodology will be summarized. The methodology has also been adopted by ABS Guide, see ABS [1].

CANNING BASIN AND GLOBAL PALAEOZOIC PETROLEUM SYSTEMS—A REVIEW

2005 ◽  
Vol 45 (1) ◽  
pp. 349 ◽  
Author(s):  
G.M. Carlsen ◽  
K. Ameed R. Ghori
Keyword(s):  
North America ◽  
North American ◽  
Oil And Gas ◽  
Oil Fields ◽  
North African ◽  
Canning Basin ◽  
Petroleum Systems ◽  
The North ◽  
Oil And Gas Fields ◽  
Gas Fields

There are more than 131 giant and super-giant oil and gas fields with Palaeozoic source and reservoir that are similar to the Canning Basin. These include Palaeozoic basins of North America, North Africa, and the North Caspian Basin of Kazakhstan and Russia.The productivity of these Palaeozoic petroleum systems depends on timing of generation and preservation of charge. Thick Ordovician, Permian, and Triassic evaporite deposits played a very important role in creating and preserving the North American, north Caspian, and north African giant oil and gas fields, respectively.The Mesozoic–Tertiary charged Palaeozoic systems are typically more productive than the Palaeozoic charged systems as exemplified by the north African basins.The Ordovician sourced and reservoired giant oil fields of the North American Mid-Continent are also highly productive. Within the Canning Basin, Ordovician sourced oil has been recovered on the Barbwire Terrace (in Dodonea–1, Percival–1 and Solanum–1) on the Dampier Terrace (in Edgar Range–1 and Pictor–1) and along the Admiral Bay Fault Zone (in Cudalgarra–1, Great Sandy–1, and Leo–1).The Canning Basin may be the least explored of the known Palaeozoic basins with proven petroleum systems. The Palaeozoic basins of North America are the most explored with 500-wells/10,000 km2 compared to the Canning Basin with only 4-wells/10,000 km2.The presence of five oil fields, numerous oil and gas shows and the well density in the Canning Basin (200 wells in 530,000 km2) suggests that further exploration is warranted. Critical analysis of the distribution of source rock, reservoir, seal, timing of generation versus trap formation and post accumulation modification for each tectonic unit of the Canning Basin is required.

Oil Production Enhancement by EOR Candidates Optimization

2021 ◽  
Author(s):  
Denis Yurievich Pisarev ◽  
Ildar Fanurovich Sharipov ◽  
Artur Michailovich Aslanyan ◽  
Danila Nikolaevich Gulyaev ◽  
Anastasiya Nikolaevna Nikonorova
Keyword(s):  
Oil And Gas ◽  
Thick Layer ◽  
Clay Content ◽  
Oil Production ◽  
Quaternary Period ◽  
The North ◽  
Oil And Gas Fields ◽  
Production History ◽  
Water Cut ◽  
Gas Fields

The study field is located in the Nizhnevartovsk district of the Khanty-Mansi autonomous region. The deposit is located in the Nizhnevartovsk crest zone. The geological section of this deposit features a thick layer (2740-2870 meters) of Meso-Cenozoic era sedimentary rocks starting from the Jurassic period up to and including the Quaternary period, and rests unconformably on the surface of the deposits of the folded Paleozoic basement. The pay zones of study oil and gas fields features mainly sandstone-siltstone reservoirs. The study formation XX11-2 features interleaved rocks with a high clay content. In the west and south-west of the field, the oil-saturated thicknesses vary on average from 5-10 m, and in the north, the thickness increases to 10-20 m. This field has a long-lasting production history as a result of drilling vertical and horizontal wells but is currently at production decline stage. The existing reservoir pressure support system assumes that the water-cut trend at the wells will increase. In recent years, there has been advanced flooding in some areas, resulting in a drop in oil production, while the reasons for the advanced flooding are not always clear. This is often due to the progressing spontaneous fracturing in the injector wells (Aslanyan, Akimov et al., 2020).

Repurposing of Offshore Oil and Gas Cables for Renewable Generation: Feasibility and Conceptual Qualification

2021 ◽  
Author(s):  
Ramy Magdy A. Mahmoud ◽  
Hazem Fayad ◽  
Paul E. Dodds
Keyword(s):  
Wind Farm ◽  
Oil And Gas ◽  
Capital Expenditure ◽  
Wind Farms ◽  
Cost Effective ◽  
Field Testing ◽  
Capital Costs ◽  
The North ◽  
Oil And Gas Fields ◽  
Gas Fields

Abstract Wind farms are expected to be deployed in the North Sea in increasing numbers and at ever greater distances from land, over the coming decades. Many nearby oil and gas fields have reached or are near the end of their lifespans, and their operators are eager to explore innovative ways to reduce decommissioning costs. One possibility would be to repurpose some of their infrastructures for use by wind farms, which would both delay decommissioning and reduce the wind farm capital costs. This paper investigates the potential for repurposing existing submarine power cores in decommissioned oil and gas fields as transmission cables for offshore renewables. Offshore power cables generally have longer lifetimes than are needed to deplete hydrocarbon reservoirs. Cable transmission capacity could be too low to provide the main connection to wind farms, but there is scope to increase capacity or use cables as auxiliary connections. A qualification methodology is proposed to assess whether existing cables might be usefully repurposed. Repurposing cables has an impact on renewable project capital expenditure (CAPEX) and levelised cost of energy (LCOE), it also positively affects decommissioning cost and the environment. The qualification methodology provides a cost-effective initial appraisal prior to field testing.

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