Study on Secondary Brine Drainage and Sand Control Technology of Salt Cavern Gas Storage

Geological conditions of salt cavern gas storage in China are characterized by dominantly layered layers with a high content insoluble mudstone. After the water leaching layer, large amount sediment accumulates at bottom cavity. During injection process, only clean brine above can be expelled, leaving layer 2–5 m and pore space sediment. To increase capacity, it is urgent to explore secondary drainage technology further expel residual pores bottom. The relatively loosely packed composed mudstone particles, which easily migrate block withdrawal pipe. In this paper, firstly, mineral composition, particle size distribution characteristics fully understood XRD sieve analysis methods. Then, lab simulation device suitable for high-salinity diameter height 25 cm was designed built. A screen sand control experiment, gravel pack artificial wall experiment chemical cementing were simulated. effects injection, pressure, on production liquid studied. influence factors intensively investigated, finally, system recommended. optimal construction parameters discharge recommended as follows: Under condition packing same size, trend different thicknesses not obvious, 2 thickness best overall corresponding 28 field. larger pack, better control, 10–20 mesh. pressure should low possible.