Analysis of Ice Loads on Offshore Structures for Okhotsk Sea Oil and Gas Fields

In the study, the results of a statistical modeling of ice loads from drifting ice features on the ice-resistant platforms in Piltun-Astohsky and Lunsky oil&gas fields of “Sakhalin-I” and “Sakhalin-II” Projects are investigated. The authors made a comparative analysis of ice loads on various types of gravity-based concrete structures in ice conditions of the Sea of Okhotsk according to the standards, procedures and guidelines from different Codes of design. And also the probabilistic model of ice loads, developed by the authors in the previous studies, was considered for comparative analysis.

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Results From Model Testing of Ice Protection Piles in Shallow Water

Volume 2: Ocean Engineering and Polar and Arctic Sciences and Technology ◽

10.1115/omae2006-92100 ◽

2006 ◽

Cited By ~ 2

Author(s):

Arne Gu¨rtner ◽

Joachim Berger

Keyword(s):

Model Test ◽

Oil And Gas ◽

Offshore Structures ◽

Full Scale ◽

Offshore Structure ◽

Oil And Gas Fields ◽

Ice Loads ◽

Drifting Ice ◽

Ice Model Test ◽

Gas Fields

The development of oil and gas fields in shallow icy waters, for instance in the Northern Caspian Sea, have increased the awareness of protecting offshore structures by means of ice barriers from the impacts of drifting ice. Protection could be provided by Ice Protection Piles (IPPs), installed in close vicinity to the offshore structure to be protected. Piles then take the main loads from the drifting ice by pre-fracturing the advancing ice sheet. Hence, the partly shielded offshore structure could be designed according to significant lower global design ice loads. In this regard, various configurations of pile arrangements have been model tested during the MATRA-OSE research project in the Ice Model Test Basin of the Hamburg Sip Model Basin (HSVA). The main objective was to analyse the behaviour of ice interactions with the protection piles together with the establishment of design ice loads on an individual pile within the pile arrangement. The pile to pile distances within each arrangement were varied from 2 to 8 times the pile diameter for both, vertical and inclined (30° to the horizontal) pile arrangements. Two test runs with 0.1 m and 0.5 m thick ice (full scale values) were conducted respectively. The full scale water depth was 4 m. Based on the model test observations, it was found that the rubble generation increases with decreasing pile to pile distances. Inclined piles were capable to produce more rubble than vertical piles and considerable lower ice loads were measured on inclined arrangements compared to vertical arrangements. As initial rubble has formed in front of the arrangements, the rubble effect accelerated considerable. Subsequent to the build-up of rubble accumulations, no effect of the pile inclination on the exerted ice loads could be observed. If piles are used as ice barriers, the distance between the piles should be less than 4D for inclined piles and 6D for vertical piles to allow sufficient rubble generation. Larger distances only generated significant ice rubble after initial grounding of the ice had occurred.

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ON NECESSITY TO CREATE UNDERWATER OIL AND GAS FLEET FOR DEVELOPING OIL AND GAS FIELDS IN LONG-FROZEN DEEP ARCTIC SEAS

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES MARINE ENGINEERING AND TECHNOLOGIES ◽

10.24143/2073-1574-2019-3-34-40 ◽

2019 ◽

pp. 34-40

Author(s):

Chingiz Saibovich Guseinov ◽

Dmitry Leonidovich Kulpin ◽

Galie Hamzaevna Efimova

Keyword(s):

Deep Water ◽

Oil And Gas ◽

Arctic Seas ◽

Oil And Gas Fields ◽

Sea Bed ◽

Ice Conditions ◽

Production Technologies ◽

Offshore Oil And Gas ◽

Gas Fields ◽

Offshore Oil

The article dwells upon the problem of developing offshore oil and gas fields around the world accompanied by producing not only stationary and semi-submersible rigs and drilling vessels, but also a large number of auxiliary vessels for various functional purposes. It would be impossible to extract offshore hydrocarbons under the sea bed without them. Special fleet was formed during the years of development of offshore oil and gas fields in the Russian Federation, the part of it being imported. In the upcoming years, our country will face some challenges related to the development of Arctic reservoirs which are mainly located in the long-frozen deep seas. Their development in deep water will only be possible with auxiliary fleet, as it will be necessary to build deep water drilling vessels and other facilities/vessels. The types of vessels of the modern oil and gas fleet are presented, depending on the area of navigation, the depth of use and the specifics of the work performed. It is noted that currently in world practice there are no examples of using proven drilling and production technologies in severe ice conditions, when ice thickness exceeds 2-3 m, because the modern ice-resistant stationary platforms can not withstand the load at a depth of more than 80-100 m. The auxiliary fleet will both service offshore rigs and ensure their long-term productivity and functionality. For the development of oil and gas fields in the long-frozen Arctic deep-sea areas it is necessary to create a full-fledged underwater oil and gas fleet.

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Search for hydrogeochemical indicators of the genetic relation between mud volcanism and oil and gas fields

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/946/1/012029 ◽

2021 ◽

Vol 946 (1) ◽

pp. 012029

Author(s):

O A Nikitenko ◽

V V Ershov

Keyword(s):

Comparative Analysis ◽

Oil And Gas ◽

Isotope Composition ◽

Mud Volcanoes ◽

Sulfate Ions ◽

Genetic Relation ◽

Oil And Gas Fields ◽

Mud Volcanism ◽

Gas Fields

Abstract The paper reports the results of a comparative analysis of the chemical and isotope composition (δ180 and δD) of mud volcanic waters and formation waters from oil and gas fields. Studies show that the waters discharged by mud volcanoes in most cases are very similar to formation waters. The most characteristic geochemical traits of both waters are elevated concentrations of hydrocarbonate ions, iodine, boron, bromine, and a low content of sulfate ions.

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Accounting for Climate and Typology of Reuse of Offshore Structures with a Change of Function

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.713-715.205 ◽

2015 ◽

Vol 713-715 ◽

pp. 205-208 ◽

Cited By ~ 2

Author(s):

Ilya Vladimirovich Dunichkin ◽

Pavel Kirillovich Kalashnikov

Keyword(s):

Theoretical Model ◽

Oil And Gas ◽

Offshore Structures ◽

Environment Protection ◽

Offshore Structure ◽

Oil And Gas Fields ◽

Offshore Oil And Gas ◽

Gas Fields ◽

Offshore Oil ◽

Oil And Gas Companies

The new typology of marine facilities deals with the problem of offshore oil and gas fields’ infrastructure usage after their elimination. The influence of climate on offshore structures and the authorities’ requirements in the matter of natural environment protection create huge costs for oil and gas companies, if the abandoned platform will be at sea. The concept of oil platform reconstruction with the change of functionhas allowedto create theoretical model of offshore structure and to identify the most relevant functions for the reconstructed objects. It has led to the following basic groups of architectural typology.

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LIFETIME EXTENSION OF AGEING OFFSHORE STRUCTURES BY GLOBAL ULTIMATE STRENGTH ASSESSMENT (GUSA)

Malaysian Journal of Civil Engineering ◽

10.11113/mjce.v30.174 ◽

2018 ◽

Vol 30 (1) ◽

Author(s):

Ezanizam Mat Soom ◽

Mohd Khairi Abu Husain ◽

Noor Irza Mohd Zaki ◽

M Nasrul Kamal M Nor ◽

G. Najafian

Keyword(s):

Oil And Gas ◽

Continuous Production ◽

Offshore Structures ◽

Life Extension ◽

Risk Level ◽

Strength Assessment ◽

Remaining Service Life ◽

Oil And Gas Fields ◽

Gas Fields ◽

Extension Evaluation

Malaysia is the second largest oil and gas producer in Southeast Asia. Majority ofjacket platforms in Malaysia have exceeded their design life with various types of underwaterstructure irregularities. Therefore, it is essential to address the reliability of the jacket platformsin Malaysia due to ageing, increasing environmental loading and demand to prolong theproduction for a further 25 years. The main purpose of this analyses is to determine thestructure’s risk level over its remaining service life which is a vital information in managingageing facilities to cater for the demand of continuous production. Global Ultimate StrengthAssessment (GUSA) methodology was used to support detailed reassessment applied inmanaging safety, integrity analyses and reliability by evaluating the existing platform’s loading.It is a tool for high-end analysis of structures for Risk-based Assessment (RBA). In this paper,the reassessment of an ageing platform over 30-year-old, still in production is presented todemonstrate GUSA capability to perform the platform’s life extension evaluation. The outcomefrom these analyses can effectively assist in understanding the structure platform’s failuremechanism and correctly identify mitigation actions required. As part of the analyses, non-linearanalysis and probabilistic model as practiced in the industry were used in order to get ReserveStrength Ratio (RSR) and Annual Probability of Failure (POF) results. The accuracy andcomprehensiveness of this method will assist the industry, especially oil and gas fields’ operators,in decision-making, specifically in identifying problem-oriented-solutions as part of theirbusiness risk management in managing ageing facilities.

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