CNOOC-981-Project

Project:
“Hai Yang Shi You 981” Semisubmersible Drilling Unit - Basic and Detail Engineering and Designs
China National Offshore Oil Corp. (CNOOC) Client: Project Outline Description:
The drilling unit is of a 6th-generation semisubmersible platform design. The unit is designed for worldwide service with both ABS and CCS classifications. The design operating water depth is 10,000ft and drilling depth of 32,800ft. The unit is equipped with a DPS-3 system as well as a 12 leg conventional mooring system designed for stationkeeping in up to 5,000ft water depth. The drilling rig design is by MH Pyramids. Construction of the unit is being done at Shanghai Waigaoqiao Shipyard.
Scope of Work:
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ESI provided specialist engineering design services under four separate contracts directly to CNOOC: Third-Party Review of the Initial Concept/Basic Design • Basic Design Extension Phase I • Detail Design Phase II • Technical Advisory and Site Support during Construction and Shipyard Commissioning as Part of CNOOC’s PMT. Third-Party Design Review The work consisted of reviewing the whole concept/basic design with primary focuses on key feasibility issues regarding the design, functionality, performance, design basis and philosophies, overall deck area, equipment arrangement, and station-keeping systems, etc.. The review also covered the drilling system specification, packaging, and vendor bid documents from MH Pyramid, and bid technical clarification questions from all bidders, and Client’s own questions regarding the existing concept/basic design.
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Recommendations were provided regarding design modifications and updates and future work focus. Design Basis Document
Basic Design Extension ESI performed an initial phase of the basic design to develop and mature the concept/basic design given a sufficient level to resolve feasibility issues, and to extend the design to a sufficient level in order to minimize major design changes during detail design and construction. ▪ Resolving the design, functionality and performance feasibilities issues ▪ Developing all the drilling mechanical and utility system P&IDs, ▪ Performing the mechanical and other specialist calculations, ▪ Developing consolidated equipment list ▪ Compiling VFI (Vendor Furnished Information) database: ▪ Hull Configuration and Functional Plan Drawings ▪ Drilling System Specification and Packaging ▪ Equipment Arrangement Drawings ▪ P&IDs and Electrical One Lines for Drilling and Hull Marine Mechanical Systems ▪ Dynamic Positioning System Design ▪ Mechanical and Electrical Engineering Calculations ▪ Construction Specification ▪ Weight and Stability Analysis Detail Design Phase II This consisted of the detail and production design for all areas at and above the main deck, all areas of the moonpool up to the substructure, integration of the drilling system with Hull.
Quality Engineering and Design Services, Deepwater Technologies and Solutions


The design covered everything, but the primary structural design, namely secondary and outfitting structures, mechanical, piping, HVAC, electrical. ESI was also responsible for providing the P&IDs for all mechanical and utility systems related to drilling in the Lower as well as Upper Hulls of the platform. The design was carried out in 3D using Aveva’s Vantage Marine suite of software, shop drawings were provided to the shipyard for fabrication. In particular, the piping design also included piping and tubing down to ½” in size. Site Team and Technical Advisory to Client PMT ESI provided a team of technical experts and system specialists who were stationed at site and were integrated as part of Client’s PMT (Project Management Team) for the whole duration of the project.
Quality Engineering and Design Services, Deepwater Technologies and Solutions

















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