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Title: Developments In Downhold Safety Valves For Gas Storage Wells
Author: Guv W. Cant, William W. Dollison
Source: American Gas Association 1970
Year Published: 1970
Abstract: Since there are now more than 13,000 storage wells in the United States, having a combined capacity of approximately 5 trillion cubic feet, protection of the product and to personal property has become increasingly important as the industry continues to grow. For more than thirty years subsurface safety valves have been used in oil and gas producing wells throughout the world. However, most of these valves were installed in wells producing native hydrocarbons and do not have a predictable pressure decline. These valves would not permit high production rates without considerable pressure drop across the valve and would require frequent adjustments to meet changing well conditions. Therefore, the development of safety valves for Gas Storage wells with relatively high production rates and known pressure declines was necessary. These valves are controlled from the surface and do not recognize variable flow rates and declining formation pressures, therefore will not close prematurely during normal pressure decline.

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