After seawater breakthrough increased corrosion rates were observed on weight loss coupons and ER probes on crude lines upstream of the 1st stage separator. Except for well known high corrosive media such as open drains the corrosion development was very low. INTRODUCTION Since commissioning of the Draugen field and until seawater breakthrough the internal corrosion on the process equipment was insignificant. This paper will focus on how the Corrosion Management has improved through co-operation between the Corrosion management contractor and the operators' staff on and off shore, and how production can be optimised and adjusted through analysis of the sand monitoring data.
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The corrosion monitoring on the topside process system is secures by flush mounted weight loss coupons is parallel with intrusive Electrical Resistance (ER) and Linear Polarisation Resistance (LPR) probes.īoth the sand and corrosion monitoring data from probes are analysed and trended with a common software and stored and reported back to the operator through a WEB based Corrosion Management Information System (CMIS). The sand/corrosion monitoring on the satellite wells is secured by acoustic systems for sand detection while at the platform wells are monitored by top side intrusive probes. TheDraugen field consists of 6 platform wells and 2 satellite wells. The objective was to select construction materials which could perform their allotted design function without unexpected downtime for a pre-determined and agreed period.ĪBSTRACT The Draugen platform is situated in the Norwegian sea outside the mid of Norway. MATERIAL PHILOSOPHY The material philosophy was established in 1990 and was based on cost effectiveness as well as project experiences at that time. The water depth at the field is from 240 to 270 metres. The field is developed with two water injection wells and one gas injection well. The platform is equipped with 5 platform wells, in addition to two subsea wells. The oilbearing sand is only 40 metres thick. The oilfield is located 1,600 metres below the seabed and is 20 kilometres long and six kilometres wide. The oil is stored in the cells and loaded on tankers by a floating loading platform (FLP). The platform is an one leg, gravity based structure (GBS) with seven storage cells at the base.
Additionally, the field also contains 3,000 mill. From 1995 to 1996 an extensive modification has been accomplished in order to increase the capacity of the process plant.īased on current forecasts, the Draugen field will produce approx. When the field was developed an average production of 100,000 barrels per day was planned, however the oil reservoir and the platform have shown they can produce more. The Draugen field produces about 180,000 barrels per day. The field is located in block 6407/9 about 150 km north of Kristiansund Draugen is the first oilfield on Haltenbanken, north of Stad. INTRODUCTION In October 1993, a new milestone was reached in Norwegian history - the Draugen oilfield started production.
temperature) are often vulnerable to variations and materials with narrow area of application are not cost efficient alternatives.Įxperiences have shown that the high alloyed 6 Mo austenitic stainless steels with a previously defined upper temperature limit of 30 OC(86 F),now is recommended at temperatures below 15 C (58 F). Additionally, the process parameters (i.e. Only results from laboratory tests were available at the time the design philosophy was implemented for application. One of the reasons for these problems have been limited practical experience with the material in the actual media. Several operators have experienced corrosion problems on seawater systems where high alloyed 6 Mo stainless steels have been applied. High alloyed 6 Mo austenitic stainless steel (UNS S31254) was selected for the chlorinated seawater system, in combination with 70/30 copper-nickel (UNS C71500) in the firewater system.Ĭorrosion on high alloyed stainless steels has been an increasing problem during the recent yews.
The Draugen production plant is designed according to traditional material philosophy, by use of a combination of carbon steel and stainless steels. drilling fluid selection and formulation (1)Ībstract The Draugen field has been in operation for 3 years and a lot of experience has been gained during this period within the field of material - and corrosion engineering.corrosion management information system (1).
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