Abstract
The development of storage facilities for natural gas has taken a different course in Scandinavia compared to other countries since the bedrock is almost entirely crystalline with only few exceptions. Storing gas in aquifers, salt domes or depleted gas reservoirs is out of the question and instead various concepts of hard rock storage have been considered. Two main concepts can be defined; lined and unlined caverns. This paper presents a pilot plant for lined caverns, being constructed at Grangesberg, Sweden. It is a joint project between Neste in Finland, Statoil in Norway and SwedeGas, Sydkraft, Vattenfall, BP A and Skanska in Sweden. The pilot plant consists of three cylinder-shaped caverns with a geometrical volume of about 250 m3 each. Three different gas-tight lining materials are being tested: Conventional carbon steel, thin stainless steel and plastic. The gas-tight liner confines the gas. The gas pressure is transferred to the surrounding rock mass via a concrete layer. Drainage pipes will be cast in the concrete layer. The drainage pipes will also be used to detect leaking gas. The tests will be carried out during the summer of 1989. Pressures up to 20 MPa will be tested, using water and air as test media. After evaluating the tests in late 1989 there are possibilities to test chilled gas storage in the pilot caverns.
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