Johan Sverdrup LQ Jacket Detailed Design
JOHAN SVERDRUP DETAIL DESIGN Introduction Statoil is in the process of developing the Johan Sverdrup field, located on the southern Utsira High in the Norwegian sector of the North Sea. Water depth is approximately 113m Mean Sea Level (MSL). As part of the development Statoil has awarded Dragados Offshore (DOSA) the engineering procurement and construction (EPC) of the LQ jacket.
The detail design is being performed by DOSA and SNC-Lavalin UK Ltd. The Johan Sverdrup field development is planned as a phased development, with a Field Centre and tie-backs of subsea templates and/or standalone wellhead platforms. Phase 1 comprises the following platforms which will be bridge linked: LQ = Living Quarter Platform - accommodation and utility DP = Drilling Platform - with integrated drilling rig P1 = Production Platform No. 1 RP = Riser Platform – riser and utility DOSA and SNC Lavalin UK Ltd has the responsibility of LQ jacket.
It is a four-legged lifted structure, with skirt piles at the four corners, which will be transported to the site on a barge and installed on the seabed using the two cranes of a Semi-Submersible Crane Vessel (SSCV). Scope Abyssal Technologies scope was to assist SNC Lavalin UK Ltd in detail design of the LQ jacket and perform several analysis including – Time domain study, Finite Element analysis (FEA) of Pile Clusters and other Items, Stress Concentration Factor estimation using FEA and DNV method, On-bottom stability analysis, Pushover and Redundancy analysis
LP Compressor Module Revamp
ABYSSAL TECHNOLOGIES - Projects - DR LNGo Modular Foundation Solution Introduction Dresser-Rand LNGo system is a modularized, portable natural gas liquefaction plant. The main requirement of this project was to design a modular foundation which can be installed at any desired location and is able to sustain all module loads including any unbalanced forces during installation and in-service condition of LNGo.
Upon completion of its service at specific location, entire system along with foundation may be moved anywhere. Scope Abyssal Technologies scope was to design a modular foundation for Portable LNG liquefaction unit. The portable unit layout was provided by client and this foundation can be installed anywhere based on clients need and is able to all environmental and operational loads.
Johan Sverdrup FEED Review
ABYSSAL TECHNOLOGIES - Projects - JOHAN SVERDRUP FEED REVIEW STUDY Introduction Statoil is in the process of developing the Johan Sverdrup field, located on the southern Utsira High in the Norwegian sector of the North Sea. Water depth is approximately 113m Mean Sea Level (MSL). As part of the development prcoess Dragados Offshore (DOSA) has assigned SNC Lavalin UK to review 2 jackets (LQ and P1) of Johan Sverdrup Field Feed Study in order to prepare detail design package for bidding. - LQ = Living Quarter Platform - accommodation and utility - P1 = Production Platform No.
Scope Abyssal Technologies scope was to assist SNC Lavalin UK in Johan Sverdrup FEED Study and prepare a detail reports of following activities Review and comment on drawings, design report, premise and interface documents for P1 & LQ. Support SNCL in suggesting design optimizations, improved details for fabrication etc. Provide input to high level schedule and manpower planning.
Consider risks to installation
FPSO Compressor Package Design
ABYSSAL TECHNOLOGIES PAGE UNDER CONSTRUCTION
Platform Reassessment
PLATFORM RE-ASSESSMENT Introduction For existing platform, owner carries an integrity assessment program to ensure their immediate and future structural integrity and to check their fit for purpose during the intended design lives or beyond. Our Client was awarded this project for performing the structural re-assessment and design of repairs/ strengthening to restore the integrity of the
Wellhead Platform.
It includes Collection, Review and Assessment of all relevant existing data, inspection reports and documents. Site visits and review/verification of “as-built” drawings and post-incident platform condition. Scope Abyssal Technologies scope was to assist our client and to provide engineering services for the platform re-assessment as per standard offshore codes and practices along with company specification.
The General Philosophy was to carry out three major analyses which is in-place analysis, seismic analysis and fatigue analysis by combining the operational, self-weight and environmental loads induced on the structure. In addition Boat Impact analysis was also performed to meet new Company criteria and to design clamps for retrofit of broken or damaged members.
Wellhead Platform Detailed Design
WELLHEAD PLATFORM DETAIL DESIGN Introduction The proposed field is located in East Coast of Peninsular Malaysia. The unmanned wellhead platform comprises of topsides and a four-legged jacket substructure. The jacket is lift installed and the structural configuration allows for the drilling of wells with a jack-up rig. In order to accommodate the jack-up rig operations, one face of the jacket is vertical and the other 3 faces are battered.The WHP Platform has Three (3) working drilling unit and 3 proposed drilling unit.
Our Client was awarded to do full concept to detail design of this platform. Scope Abyssal Technologies scope was to assist in detail design of the WHP jacket and perform several analysis including – Jacket Concept Design, In-place strength and fatigue analysis, Accidental Analysis (Ship Impact), Pushover Analysis, Boat Landing Design, design of Conductor/Conductor guide design and Pile & Conductor Makeup.
Wellhead Platform FEED Study
ABYSSAL TECHNOLOGIES - Projects - FPSO Compressor Package Skid Design Introduction Husky CNOOC Madura Ltd. (HCML hereinafter called CLIENT) plans to develop the Madura Strait Block BD gas reserves for sales gas to buyers in Java Island. The project includes an offshore spread moored converted tanker based Floating, Production, Storage and Offloading (FPSO) with gas processing facilities and self-sufficient offsite and utility systems.
As part of this project, Dresser Rand was assigned to manufacture a Gas compressor system for the proposed FPSO. They designed and manufactured the whole package as per requirement mentioned by Client(including associated facilities). Scope Abyssal Technologies scope was to provide detail design and engineering services for Gas Compressor & Motor Skid as per standard offshore codes and practices along with company specification.
The General Philosophy of the design would be to develop minimum skid weight to maintain structural adequacy for all the loads and load conditions that the skid will experience during the life of the facility and to ensure that the structural design is within the allowable limits defined in the applicable codes and standards. We carried out the skid in-service, transit, transportation, lift and vibration analysis.
Blower Impeller FEA & CFD
ABYSSAL TECHNOLOGIES - Projects - Blower Impeller FEA and CFD Introduction A blower impeller fan is a mechanical device for moving air and gas by using centrifugal method. These fans increase the speed of air stream with the rotating impellers. Objective of the project was to check the flow inside the blower and map the pressure of the fluid onto the structure of the impeller and then evaluate possible causes of the failure.
Scope Abyssal Technologies scope was to perform Computational Fluid Dynamics coupled with Structural analysis for a blower impeller and then evaluate the structural stresses inside it. The study was done in two stages. The fluid flow inside the blower was analysed using CFD in the Stage-1, whereas structural analysis was carried out in Stage-2. - For Stage-1, the CFD analysis was performed using ANSYS and post-processing was carried out using ANSYS CFD Post. - For Stage-2, the FEA analysis and post-processing was performed using the general purpose finite element software ANSYS.
Reactor Air Outlet Liner CFD
ABYSSAL TECHNOLOGIES - Projects - LP Compressore Module Revamp Introduction Oil & Natural Gas Corporation Ltd. (ONGC) owns and operates number of Production Complexes located in the West Coast of India. ONGC plans to minimize the gas flaring by recovery of L.P flare gas as part of “FLARE GAS RECOVERY PROJECT” at NEELAM & HEERA process complexes. As part of this project, it is planned to remove & dismantle existing Air coolers (including their associated facilities) on the roof of existing LP compressor module as per scope mentioned elsewhere in the Bid Package and to provide new air coolers on LP compressor module (including associated facilities).
Scope Abyssal Technologies scope was to perform global in-place analysis of LP compressor module for the new loads of Air Coolers and accordingly provide necessary strengthening to roof structure & other framing members.
Dropped Object Analysis
OF DRILL FLOOR Introduction The Jackup rig is being used for its intended purpose of performing drilling operations using onboard drilling platform. It has been in continuous operations and performs extensive handling of drill collars and drill pipes. It is quite evident that there is certain probability of falling the collar or drill pipe itself on the drill floor.
Consequently it becomes important to assess the structural integrity of drill floor for an accidental fall. Scope Abyssal Technologies scope was to perform dropped object analysis for proposed drill floor. This project covers analysis of the drill deck and rotating mouse hole top plate to avoid possible damage due to dropped object for the Jackup rig. The proposed design is to be reviewed/ modified/updated as per the results of the dropped object analysis.
The dropped object is considered as an accident, therefore, the deck plate was allowed to go in plastic zone provided that it does not lead to global collapse and is within the acceptable rupture plastic strain. Therefore, nonlinear elasto-plastic analysis has been considered and structure is allowed to reach plastic state and acceptable critical rupture plastic strain limit.
Hot Header FEA Analysis
Scope Abyssal Technologies scope was to perform thermal-structural coupled analysis of a hot header. In this project, steady state thermal analysis was carried out followed by a coupled thermal-static structural analysis. The temperatures from steady-state thermal analysis were assigned as input along with other structural boundary conditions in the coupled thermal-structural analysis.
