The Flow Law of Brine and Sediment Particles in Gas-Driven Brine Drainage in the Sediments of Salt Cavern Gas Storage

The geological resources of salt cavern gas storage in China are mostly complex layered beds with many thin inter-layers and high insoluble matter content. In the process cavity-building by water-solution method, matters layers peeled off deposited at bottom cavern, occupying more than one-third whole cavity volume. These sediments have a large pore volume strong compressibility, they filled brine; as result, great potential for storage. research on flow law brine sediment particles gas-driven drainage caverns is basis utilizing void space this paper, cores wells Jintan District were selected, physical characteristics analyzed. Then, laboratory simulation device experimental method presented. Using artificial composite device, following was tested: (i) rates vicinity drain pipe under different nitrogen displacement pressures, (ii) relationship between sand extraction amount pressure pipes, (iii) sizes time, (iv) cumulative (v) effect rate amount. results show that quartz, plagioclase, ankerite account 45–94% clay accounts 3.3–14.4% minerals from District. particle size distribution ranges 0.04 mm to 6 can be divided into four ranges: <0.5 mm, 0.5 mm~2 2 mm~4 >4 mm. mass percentage each range 37.9%, 36.5%, 17%, 8.6%, respectively. There threshold drainage, where larger diameter sieve hole, lower pressure, easier out. hole has influence near pipe. increase positive correlation 5 holes, but little pipes 1.5 or holes. affected factors such drainage. A higher lead extraction. screen 1 holes suggested used control, recommended machined shape trumpet small inlet section (i.e., mm) outlet end mm), about 30 m3/h when removal carried out which depends actual operation site.