In the oil industry it is always challenging to visualize a full subsea structure or pipeline with precise as built/ as found dimensions or information due to limited visibility underwater and limited accuracy of underwater positioning. But wouldn't it be much easier if you can visualize underwater with same accuracy and details as onshore. Fortunately Photo Realistic 3D Cloud (PRC), a cutting edge innovative technology have allowed to scan complete structures underwater to create a 3D Cloud of millions of points presenting the as-built of the scanned structure, giving very accurate measurements more than 1/1000 (ex: 1mm accuracy in a 1m measurement)Using breakthrough advanced optical sensors and mathematical disciplines. Adopting this technology along with driverless ROV inspection on our aged critical subsea structures, in ADMA OPCO, has allowed obtaining comprehensive inspection data, much superior to typical diver inspections, along with precise 3-Dimensional overview of the structure like never before. This enabled us to locate defects, as found underwater on to a 3-d model of the structure with dimensional accuracy making it easier for the engineering team siting on-shore to assess condition of the structure like never before. 3D model also severs as a record for future reference and allows a freedom to have a virtual mockup of the mitigations required on the structure. This means future site visits are minimized, saving substantial cost and time.

ADMA-OPCO subsea flare lines are unpiggable and exceeded the design life. These lines have never been internally inspected. To use conventional pigging and IP method of inspection on these unpiggable flare lines is high risk operations and will require long duration of pipeline shutdown.By utilizing the new MTM technology in combination with verification technique like AUT, inspection of such pipelines are made possible, making risk management on such pipelines a reality. This technichue avoid production loss, no issues of stuck pig and modifications when performing the inspection. MTM detects magnetic anomalies caused by mechanically stressed area on a pipeline from external survey.MTM device is attached to ROV and swim along the pipeline and collects magnetic anomalies readings; the critical locations can be detected and verified by AUT on the spot (or later). It detects metal losses and other overstress anomalies such as dents and buckles.In combination with AUT survey and FFS/RLA, a comprehensive report is made to assess and ensuring safe operation of unpiggable piplines both subsea and underground.

A wide range of Oil & Gas plants is subjected to periodic inservice inspection in order to ensure continued safe and economic operation. The catastrophic failure of a component in a process plant may result in costly business interruption and also it endangers plant personnel. If an explosion or fire occurs, or a hazardous chemical is released widespread fatalities or undesirable environmental consequencies may result. Premature failure of plants can hapeen as a result of variety of different causes, and these include design deficiencies, manufacturing defects, fabrication or erection defects, service related deterioration and operating deficiencies. In order to prevent the sudden upset and resultant catastrophic failures, regular inspections most suitable for the anticipatory failures has to be identified and executed. The inspections are often performed by traditional NDT methods such as Radiographic testing and ultrasonic testing. These can be highly sensitive, but the rate of coverage is relatively very low and extensive preparation for inspection often required, eg. Like insulation removal or composite wraping removal often required for the inspection of substrate. There are also many situations where access or geometry prevents the use of conventional inspection methods. Over recent years a wide range of advanced NDT technques has evolved. These techniques provide large area screening of a component for significant degradation. Some of the techniques can be rapidly applied and they also provide means of inspecting areas which would be uninspectable. PEC or pulsed eddy current is one among this and this inspection technique is most suitable and best approach for insulated and composite wrapping applied section of piping. ZK site have many critical piping components applied with pressure / non pressure containment composite wrapping and the recent survey on these piping concluded many affected by corrosion under wrapping. PEC inspection is a solution for the inspection and condition monitoring of substrate under the wrapping, and which has proven and established.

Dead-legs are potentially the most critical components within a piping system to assess against corrosion degradation. The root cause of the issue relates to fluid being stagnant inside a dead-leg and separated from the main flow stream which in turn creates the condition prone to activate certain corrosion mechanism such as under deposit attack, etc. API RP 570[8] requires inspection to be carried out at these sub-components however still not very clear on how the corrosion rate may be different to the main line. When carrying out Risk-Based inspection as per API RP 581[1], the damage factor as the index for likelihood of failure is tripled if a very comprehensive inspection has not been carried out on a deadleg. Nerveless it is understandable that a universal methodology cannot be implemented due to the large variation of product (and consequently corrosion rate) within the piping system across all process plants using API documents as their assessment guideline. To overcome this issue, ADMA OPCO together with TWI have developed a guideline document (GDL-059[6]) to address specific requirements to identify and assess deadlegs within ADMA OPCO offshore and on-shore process piping. GDL-059[6] provides recommendations on how to identify a deadleg, and once it is identified, how to gather the information required for further assessment. As it is neither practical nor economical to carry out a comprehensive inspection at each deadleg within short time interval, recommendations are also provided on how to evaluate a relative corrosion rate of a deadleg to its parent piping system. Contributing factors to the higher corrosion rate at deadlegs such as dimensions and orientation of the deadleg together with the nature and velocity of the flow were examined using qualitative and quantitative approach. Recommended values of relative corrosion rates are provided and a decision making process is given in-line with API RP and API RP philosophy.

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.