ABSTRACT

Kuwait Oil Company (KOC) internal corrosion monitoring management involves different measurement techniques including the use of fluid chemistry analyses and internal corrosion monitoring devices such as weight loss coupons, electrical resistance probes (ER) and linear polarization probes (LPR) for direct internal corrosion rate measurements. It also includes the use of bio-probes and intrusive hydrogen probes in selected locations. All collected data from these techniques are used to obtain the internal corrosion rates and trends.

ER and LPR probes from different manufacturers are being utilized to optimize the chemical injection program applied across various facilities in order to control the internal corrosion. Probes from different manufacturers have different probe factors/constants, which are a function of element thickness and geometry for ER probes, and probe multipliers for LPR probes. These factors and multipliers compensate the difference between electrode materials, electrode sizes or operating conditions, and hence, it is necessary to harmonize the data from these probes to enable to attain comparable and reliable performance.

The purpose of this paper is to describe a functional test program designed with laboratory conditions suitable for the corrosive situations experienced in the field and screening the performance of various ER and LPR probe types for further application in the field.

INTRODUCTION

KOC is the major oil producing company in the state of Kuwait, responsible for exploration, extraction, production and processing of crude oil. The latest production capability is approximately 3.1 million barrels per day. The Company’s target is to increase the production target to 4.0 million barrels per day by the year 2020.

The Company’s assets are spread over four different field areas, North Kuwait (NK), West Kuwait (WK), South Kuwait (SK) and East Kuwait (EK). There are approximately 2500 producing oil wells located in the field areas. The crude oil is collected through flowline corridors connected to gathering center facilities, where the crude, gas and water are separated and processed for export. KOC has 22 gathering centers and the final products are transferred through the company’s pipeline networks to the export facilities, as well as to local refineries. With such huge capacity from so many facilities, internal corrosion management of the facilities to improve asset integrity is of paramount importance.

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