Session: 01-01-02 Offshore Platforms II

Paper Number: 81373

81373 - Vessel-Less Underwater Inspection at Fixed Offshore Structure by Utilizing Mini Remotely Operated Vehicle (Mini-ROV) 

    The objective of this paper is to share a new way of performing underwater inspection for fixed offshore structures using Mini Remotely Operated Vehicle (Mini-ROV). In the effort to achieve optimize unit maintenance cost, it is essential to find new ways to perform the costly underwater inspection. This is achieved through deployment of readily available technology which allows the elimination of Dynamic Positioning Diving Support Vessel (DP DSV).

    A new method of vessel-less underwater inspection was introduced by launching Mini-ROV from platform deck to perform typical Level III survey. The small size ROV is light and easy to be handled by ROV technician onboard platform deck. Depending on the model of Mini-ROV, launch and recovery of the system can be handled manually, using available platform crane or simple Launch and Recovery System (LARS). The required crew to perform the job can be as minimum as 6 pax. Another advantage of this system is that it is capable to enter restricted and congested areas due to ease of maneuvering, which provides better clarity in capturing close visual of the asset condition. During emergency, the Mini-ROV can be instantly mobilized to support any General Visual Inspection (GVI) related scope.

    PETRONAS has successfully piloted this technology for GVI at a guyed wire monopod platform in one of the operating regions in September 2017. First replication in March 2018 at another similar platform with improved visual recording and successful contact Cathodic Protection (CP) measurement were captured from the inspection. Subsequent deployment in July 2020 at braced monopod structure with enhanced inspection tools i.e. CP Probe, Marine Growth cleaning tools, and Flooded Member Detection (FMD) were completed successfully. The inspection data comprises of major input to Structural Integrity Management (SIM) program and addresses the key areas of Data, Evaluation, and Strategy to manage risk levels in Risk Based Underwater Inspection (SICS RBUI ^{© 2015 PETRONAS}) ^[3] program.

    Breakthrough to conventional inspection method which utilizes DP DSV resulted in cost saving of 30% - 50%. The data plays a crucial role in ensuring the right methodology is deployed in support of digitalization and data driven decision making. Underwater inspection of fixed offshore structures using Mini-ROV is shaping the new landscape for the industry and can become reference for other Oil & Gas Producers (OGPs) to emulate. Project Risk Assessment was also conducted prior to execution with recommended safeguard in place which result to zero HSE incident during project execution.

    Thorough evaluation on suitability of the platform is required prior to deployment, which inclusive of complexity of jacket configuration, hazardous zone classifications and availability of deck space for equipment placement shall be evaluated. Logistic arrangement for equipment and manpower (bedding) should be planned to ensure efficient site execution. The Mini-ROV integration with other tooling needs to be customized based on identified scope and Mini-ROV model. Stability of the Mini-ROV also required continuous improvement to increase uptime of the ROV.

Presenting Author: DAVE CHEN LUNG CHONG PETRONAS CARIGALI SDN BHD

Authors:

DAVE CHEN LUNG CHONG PETRONAS CARIGALI SDN BHD
Ave Suhendra Suhaili PETRONAS CARIGALI SDN BHD
Sok Mooi Ng PETRONAS CARIGALI SDN BHD
W Hariz Fadli W Shafie PETRONAS CARIGALI SDN BHD
Biramarta Isnadi PETRONAS CARIGALI SDN BHD
Riaz Khan PETRONAS CARIGALI SDN BHD
Kheng Hoong Lau PETRONAS CARIGALI SDN BHD
Nurzarina Hassan PETRONAS
M Faqrudin B Ismail PETRONAS