ADMA-OPCO has main subsea pipelines in sizes ranging from 16" to 48" Dia with approximately total length of 275 km through which crude oil, gas and condensate are transmitted from Umm Shaif and Zakum Fields to Das Island, north west of Abu Dhabi, for processing and loading. These pipelines are vital, considered the nerve system of ADMA-OPCO production facilities and are the only source of gas supply to ADGAS' LNG plant. Hence their availability and reliability is the prime factor in ADMA-OPCO's and ADGAS' productivity. Having noted that recently Abu Dhabi offshore areas have had quite an increasing number of reported pipeline incidents, the possibility of a pipeline failure resulting from seafaring traffic, operation and materials can never be ruled out Such failure can lead to prolong production down-time especially if an operator is not adequately equipped to cope with such an emergency failure.

1.0 Introduction ADMA-OPCO is the pioneering offshore Oil and Gas Producer in Abu Dhabi, UAE dating back to the 1950s. ADMA-OPCO operates more than 1500 km of sub sea pipeline network, built over the years as part of the progressive development in Umm Shaif and Zakum fields. ADMA-OPCO vision is to work effectively as one integrated team to produce hydrocarbons from offshore areas aspiring to excellence in all aspects of the business. This paper identifies ADMA-OPCO current key challenges being faced in and around existing developments, "Brownfields" considering the additional challenges imposed by the extensively busy oil & gas market. The paper is aiming to conclude and recommend best practices, key success parameters and lessons learnt which shall provide significant values to future projects of same nature. Conclusions and recommendations were extracted through professional coverage of ADMA-OPCO Water Injection Pipelines Replacement Projects started in year 2000 and are anticipated to be complete by 2015 in a phased manner. It is worth mentioning that all executed phases have been completed with great success, ahead of schedule and below allocated budget. 2.0 ADMA-OPCO Replacement Strategy 2.1 Main Objective of the Replacement Strategy Replacement of existing water injection pipeline systems in Zakum and Umm Shaif offshore fields to enhance the capacity of the current system and ensure un-interrupted safe supply of water injection.

ADMA-OPCO Produced Oil and Gas in offshore areas for approximately 40 years with evolving business, HSE and Integrity Challenges which demand high level of Organisational Competence in order to continuously meet such challenges. This paper describes ADMA-OPCO Long Operational experience for assuring Competency mainly for the front line workforce (Production Operation and Maintenance). Adma-Opco consider the Competency of the Front line workforce is vitally important for the Safety of Employees and its Operations, and any lack of competency would lead to accidents and business interruption. Adma-Opco is the first regional Organisation who has introduced the Competency assurance system, which started in 1993 for Operations employees and progressively evolving. The system calls for setting up Job Standards based on industry practices, including internal and worldwide recognized third party assessment and verification. The result of such assessments mainly provides assurance of individual competency level, identification of specific gaps and recommending action plan to bridge such gaps. To date more than 24 campaigns have been implemented covering 500 employees. These campaigns resulted into 80% competency success. The paper will outline Quantifiable Benefits namely:Employees and their Development.Business and HSE Performance.Quality based Emiratisation through effective skills and knowledge transferRecognition for achieving high competency standards. Introduction ADMA-OPCO as part of the ADNOC group is fully committed to ADNOC's vision of the future. By 2004 we will have 50% Emiratisation. This is an arduous task given that within ADMA-OPCO and operations group we are currently at 34% Emiratisation. The population of ADMA-OPCO is relatively old and the percentage of UAE national employees will naturally increase to 44% assuming we replace all retired personnel with Emiratees. This submission will show how ADMA-OPCO Production Business Units are meeting HSE requirement during the achievement of 50% Emiratisation by 2004. It should highlight that any lack of competency would lead to accident and business interruption. During this transitionally period there will be a dramatic loss of experience within ADMA OPCO. The challenge is to ensure that all the new personnel are sufficiently trained and can demonstrate that they can do their jobs in a manner which maintains or betters HSE standards. After considerable research the approach chosen was to develop a Competency Assurance Programme which would enable ADMA-OPCO to demonstrate that its young UAE National (ATIs/graduates) in particular and its employees in general were competent in their assigned roles. This programme will also manage each individual's progress and promotion in the Company. The overall programme is already demonstrating that we can produce demonstrably well trained ATI/graduates who can enter the workforce as competent employees. Their progress can be monitored and guided by Competency Assurance exercises which highlights where additional training is required in order to accelerate and manage promotions. This methodology was developed by ADMA-OPCO for its own use. However it is applicable to any company who wants to increase the level of Emiratisation and improve operational and safety performance. Eight competency assurance campaigns were completed during year 2001 and covered 139 employees from all disciplines. These campaigns defined the individual's gaps and recommended the remedial course of actions to bridge these gaps. To date 27 campaigns have been implemented covering 500 employees. These campaigns resulted into 80% competency success.

ADMA-OPCO requested that an independent third party laboratory evaluation be conducted on a number of corrosion inhibitors to select the best in class for the protection of the Zakum Oil system, Umm Shaif Oil system, and Gas & Condensate system. The performance tests on the inhibitors were carried out in a 4 Phase approach, ranging from acceptance testing covering a range of physical and thermal stability scenarios through to high pressure and high temperature autoclave tests to determine inhibition performance under both CO2 and H2S environments. This approach was critical due to the ageing of facilities which required further assurance in terms of corrosion inhibition. Throughout the laboratory Phases key performance milestones were established and ranked to allow successful candidate chemicals to move to the next Phase of the testing. From an original seven potential candidate chemicals only four proceeded to the completion of the project. This paper aims to describe the methods employed and criteria established for screening corrosion inhibitors to ensure only the best in class are utilised for future field applications. The discussion will focus not only on the specific methods and results, but also the reasoning behind the methods employed and how these aided in ensuring the most technically effective corrosion inhibitors were identified for the application requirements.

Several thousands of kilometers of subsea pipelines and cables were installed in UAE shallow waters from 1960's till date; continued expansion can be seen through ongoing and several new projects. During this period many challenges have emerged in subsea pipeline design, installation and commissioning aspects and have presented a major constraint for offshore oil & gas operating companies in the region, affecting both the infrastructure development and the day to day operation in the field. Systematic efforts have been made to identify, assess and consciously resolve these identified challenges attributed to the overall "pipeline system design" vis-à-vis ensuring harmony with prevailing industry practices. Through due diligence and commitment, improved engineering design and installation practices have been developed with utmost synergy and collaboration between the operating companies to successfully overcome these challenges and present a safe and risk-free pipeline system for the production and export of processed crude in this region.