Abstract

In work principles of modeling of interaction of sea gravitational oil andgas extraction platforms with the soil basis are presented. The seabed level ispresented by the non-uniform model consisting of seven layers of soils, satedwith a liquid. Approximate calculation of interaction platform Prirazlomnayawith a sea-bottom is resulted.

Introduction

Demand of oil and gas increase requires development of new oil and gasfields leads us to study of them on the sea and ocean shelf.

For this reason the actuality of the development of new justified methods ofdesign and construction of gravity-based structures (GBS) in application tosevere conditions of the arctic shelf is obvious.

Unfortunately the rich world experience is not sufficiently oriented todesign of GBS in combination of large quantity of negative factors and Russianengineering practice does not have a lot of experience of GBS design onoffshore shelf, but it has some experience of design and construction of hydrotechnical structures in the north zone.

That is why the primary aim of this article is to develop of thescience-based procedure of design of the system " GBS - bed-plate" in severeconditions of the Russian shelf, which provides requisite reliability andsafety level.

1 Problem set

Developing oil deposit Prirazlomnoye use of a gravitational platform issupposed. In the conditions of increased requirements of safety the estimationof stability of a platform on a sea-bottom becomes the important engineeringproblem.

For an estimation of stability platform Prirazlomnaya on the sea-bottom ithas been developed two 2D analytical models consisting of model of the basis ofa platform and an anisotropic solid-state element, simulating the saturatedfile soils, composing the sea-bottom. Basic difference of schemes are thefollowing:

  • in the first settlement scheme the weight of the top structure has beenreplaced by action of uniform pressure,

  • in the second scheme - non-uniform condition and ice loads.

That fact has been taken into consideration, that the weight of the topstructure is distributed non-uniformly on the area of the basis of aplatform.

Abovementioned mechanical models are presented in Figures 1 and 2.

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