Detailed Description :

Background

The 52/5A platform produced gas from 11 platform wells through glycol contactors and metering to an export pipeline. The platform was originally manned. The project intent was to de-man the platform to meet the limitations of CSON 58.

Project Description

A wet gas export mode of operation was proposed with the contactors acting as three phase separators for bulk water separation. Condensate was spiked back into the export gas, after metering, and water was treated and disposed of overboard. A materials of construction assessment was carried out for the sour, wet conditions. Utilities on the platform were rationalised and simplified.

The platform was equipped with a new SCADA/ESD system to enable remote control from the Hewett Central Complex (48/29 FTP) some three miles away. Many instrumentation changes were made to convert the platform from pneumatics to an electronic system. The new SCADA/ESD was tied into the existing Fire and Gas System.

The existing power generation was retained on the platform and a new battery room was added to enable the platform to continue production for 24 hours after the loss of mains and stand-by generation. This was to overcome nomination and production penalty problems. Many more minor electrical changes were made to ensure full operability and maintainability of the platform.

The existing telecommunications link between 52/5A and the Central Complex was upgraded and an independent second parallel link installed. Piping, structural and mechanical changes were made as necessary.

The existing Living Quarters was converted into an Emergency Living Quarters. HVAC changes were made as necessary. Safety and Fire and Gas considerations were pursued, including the performance of some QRA work.

A detailed cost estimate of the project was prepared together with a project implementation schedule and an offshore installation schedule.

Enquiry packages for long lead items were prepared and subsequent budget quotations reviewed. As the project moved into the detail design phase the project services team undertook responsibility for the full procurement scope. This included pre-qualification of suppliers, issue of final enquiry documents/evaluation of bids through placement of purchase order and ultimate tracking of materials and equipment. A developed follow-up engineering phase followed detail design and provided continuity of personnel into the supervision of testing/inspection and offshore installation/construction.