ABSTRACT

Effective and successful utilisation of materials for oil and gas production systems is the essential integral part of a strategy to provide safety and sustaining economy. In this context, selection and optimisation of appropriate materials which can tolerate production scenarios are the underpinning issues. This paper describes the approach taken to optimise materials for sweet and sour service duties focusing on environmental and hydrodynamic parameters bearing in mind whole life costing. Past successes in effective use of carbon and low alloy steels are included highlighting key enabling criteria allowing extended use of these alloys. The paper combines extensive existing data, field experience with options for laboratory assessment hence offering progressive means of corrosion design for materials optimisation in hydrocarbon production.

INTRODUCTION

The search for new sources of hydrocarbon has pushed the operational activities to harsher environments in deeper high pressure/high temperature wells and deep water. These have imposed increased challenges to the economy of project development and subsequent operations wherein facilities integrity and materials optimisation are becoming the overriding issues. In addition, the economic and operational necessities for multi-phase transportation through sub-sea completions, long infield flowlines together with CO2 sequestration have a tendency to increased risk of corrosion in which materials optimisation underpins success.

Materials optimisation and the effective strategy to corrosion management, therefore, still remain key operational obstacles to successful hydrocarbon production, economy and safety. Corrosion has wide-ranging implications on the integrity of many materials used in the petroleum industry. Its impact can be viewed in terms of its effect on capital and operational expenditures (CAPEX and OPEX) and health, safety and the environment (HSE) [1,2]. In this paper an integrated strategy to materials optimisation is illustrated to enable safe and trouble free operations whilst maintaining economy.

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