Solving Completion Options for Underground Gas Storage Through Geomechanics

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Abstract

Abstract Varition of gas demand yearly, weekly, at different tine in a day and seosonly is the main driving factor for gas storage. Ideally the gas needs to be stored at the comsumption points and the demand fluctuations need to be met by supply. Thus the underground gas strorage operators need to maximize the storage capacity and minimize the cost of storage. Furthermore the operations need to be safe during the injection and production cylces. During underground gas storage the reservoir is exposed to large range of pressure changes i.e. injection and production cycle. The stress state acting on the reservoir rock during this cycle is very high. In addition, the rate at which gas is injected and produced can subject the reservoir rock in the near wellbore region to large stresses. Both the change in stress due to changes in the reservoir pressure and changes in stress due to injection and production rate can be sufficient to fail the rock in this near wellbore region and cause sand production. Any sand production is likely to damage wellbore and surface equipment, and ultimately may render the gas storage operation unviable. An understanding of the state of stress in the reservoir created by these gas storage operations is critical to avoid unwanted sand production. A geomechanical review of the potential for sand production in the Haidach Underground Storage Reservoir, Austria, illustrates the steps necessary to determine the stress state that will cause formation deformation and probable sand production. The study assists the selection of stable zones for perforating wells and sets operational limits for the gas flow to and from the wells

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