Abstract
The main solution mining method of gas storage in salt cavern is positive cycle in China. The solution mining speed is low which need from four years to five years to build a cavern with the volume of 200000 cubic meters. The method of solution mining is single. It is difficult to adapt to the rapid development of domestic underground gas storage. Many kinds of solution mining methods are required to be studied in order to increase the solution mining speed. By numerical calculation and field application, the process and advantages & disadvantages of all sorts of solution mining modes are described, the reasean to increase solution mining speed are analyzed such as reverse circulation, large hole, double well, double strings and so on. Research shows that the main solution mining modes of gas storage in salt cavern in the future are reverse circulation, large hole, double well and double strings, which can increase solution mining speed effectively. There are some shortcomings and difficulties of solution mining with large hole cavity and double well and double strings. Many key technologies need to be studied. Cementing is difficult for large hole method, it is difficult to control cavity for double well method, production casing is vulnerable to brine corrosion for double well method. The solution mining of reverse circulation is relatively mature with cavity controlling and cushion detection, which can improve solution mining peed effectively by more than 20% and can advance the construction process of gas storage in china.
Highlights
Gas storage in salt cavern is constructed in layered salt layer with low grade salt rock and thick layers in China
Many domestic scholars have analyzed various problems existing in salt cave cavity, and they concentrate on interlayer collapse, string bending, large hole solution mining, constructing groove rapidly, etc
Zheng Yali [17] has studied the applicability of large size string solution mining under special geological conditions in China, and the study results shows that large size string solution mining has obvious advantages in speeding up the progress of solution mining, saving cost and reducing energy consumption
Summary
These gas storages use solution minning with single well convection method that the oil cushion is used as the protective liquid and the positive circulation is the main cycle [1,2,3]. Many domestic scholars have analyzed various problems existing in salt cave cavity, and they concentrate on interlayer collapse, string bending, large hole solution mining, constructing groove rapidly, etc. International Journal of Oil, Gas and Coal Engineering 2018; 6(3): 39-43 of solution mining technology in China, it is the main trend of the development of gas storage in salt cavern that solution mining with reverse circulation, large borehole, dual wells, directional well and double strings can improve the solution mining speed effectively
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