Once Statpipe became operational in 1984, however, the Norwegian share of that output was transported to Kårstø. This processing plant north of Stavanger separated out the various components (a process known as fractionation) for onward sale. From 2007, all the natural gas from Statfjord has been piped to the UK via the Tampen Link pipeline and Britain’s gas gathering system.
Natural gas removed from the wellstream through pressure reduction is a mix of several different light hydrocarbons, with methane as the main component. Ethane, propane and butane are also present. Statfjord’s gas production was initially injected back into the reservoir.
Utilities are a collective term for the systems required to operate a platform, other than those directly involved in oil and gas production. This definition embraces direct support for the production process, general power generation facilities, and systems which sustain life and work on the installation. The latter include safety, process control, heating and ventilation, and communication equipment.
Crude oil processing
Crude oil coming up from the reservoir must be separated from the associated gas and water, and have its pressure and temperature reduced through a multistage process. Only then can it be stored in the big cells in the gravity base structure (GBS) for each platform. Processing the oil is intended to stabilise it enough to allow tanker transport.