科研之友
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摘要
The natural gas storage plays an important role in countries gas supply system as it manages fluctuation of demand and prices by matching seasonal or peak supply-demand. Moreover, it composes a Supply-demand security and optimizes the network capacity. Underground Gas Storage (UGS) in salt caverns holds several advantages over the other types of storage methods, such as higher deliverability (gas can be withdrawn and refilled very quickly), larger fraction of working gas relative to total gas (provided by lower cushion gas requirement) and efficiency in operational cycling.
Turkey and Poland, owing to their strategical location on the route of the natural gas transmission pipelines, have big strategic importance. There are six domestic underground gas storage facilities currently in use in Poland, situated both in depleted natural gas fields and salt caverns. Mogilno Cavern Underground Gas Storage (CUGS) is the only salt cavern gas storage field among them.
Despite the fact that. there are no underground storage units currently in operation in Turkey, alterations in natural gas market push the Authorities to make significant precautions. Furthermore, UGS Facilities be brought out as an urgent task bearing in mind a long-term construction schedule of an UGS facility which would be able to answer the future consumption.
The major objective of this study is to examine and to compare two differently located underground salt caverns; one in Mogilno CUGS Facility-currently operated in Poland- and the other one in Tarsus P-UGS Facility Project, a potential storage field to be operated in Turkey. In order to enable simulation operations, a suitable location of imaginary pattern cavern will be chosen.
For optimization, a pattern cavern model which has a constant cavern volume is used for each depth localization applications. Having decided a size of the cavern and its geometrical volume, in order to compare and optimize which depth is sufficient for the cavern localization, KAGA introduces run for different supply-demand scenarios throughout the given depths.
In Mogilno CUGS simulations, two real gas caverns are examined, one in shallow location and the other in considerably deep location, The results obtained from Polish storage case study are compared with a pattern cavern hypothetically located in three different depths of a candidate UGS Facility which will be developed in salt deposits near Tarsus.
In this aspect, KAGA(1) computer model was used to simulate the thermo-hydrodynamical processes occurred during the operation of underground natural gas storage. A detailed cavern study and model development optimized by the KAGA software enables efficient operation during the max. and min. demand scenarios and subsequently it allows the operator to successfully optimize cavern operations. In order to obtain an efficient cavern development in Tarsus P-USG the cavern should not only have possibly big volume but also it should be located in the considerably deepest depth. KAGA simulation model is also used in herein study to select an optimal cavern location for hypothetically planned Tarsus P-UGS Facility. Subsequently, the information provided by KAGA can be used in further cavern optimizing operations for Tarsus P-UGS.
Therefore, simulation results for Tarsus case prove, both from technical and cavern point of view, that the most suitable location for cavern development are the depths between 1150-1200 meters with an optimum flow rate between 100.000 m(n)(3)/h and 150.000 m(n)(3)/h. These results are presented and extensively discussed in this study. What is more, the results also indicate that in case of the inability to improve the geological parameters of depth or temperature conditions of the rock massif there is a possibility to increase the production string diameter, which in this study is taken as 7".
- 出版日期2007
