Research on Key Parameters for the Structural Design of Brine Extraction Well under the Conditions of Detrital-Bearing Strata in Chaerhan Salt Lake
Due to the adverse engineering geological characteristics of the salt lake,such as loose debris layers,lack of cementation,susceptibility to liquefaction,and weak bearing capacity,the completion and smooth operation of the large-diameter brine extraction wells in the salt lake face four major engineering challenges,fundamentally constraining the scale and engineering mining of deep brine.In this paper,in the typical mining area with debris layer in Bieletan of Qarhan Salt Lake,the permeability comparison test of different pore size and sand control effect of different gravel particle size under the condition of debris layer is carried out,and the key parameters of well structure design of brine extraction well under the condition of multi-debris layers are studied.The test results show that,(1)sand control and collapse prevention should be emphasized in the wellbore design of brine extraction well,and the type of water filtering struc-ture should be filled with gravel.(2)In order to enhance the pressure resistance of the wellbore pipe,the outer wellbore pipe should be thickened,and the pipe should be 10 mm thick,and the inner wellbore pipe should be 8 mm thick.(3)The high water inflow of this test and the new brine extraction well in 2022 both show that the combination of round hole and striped filter pipe has relatively good pressure resistance,wa-ter seepage and sediment filtration performance,and the brine extraction well has large water inflow.Com-pared with the cost reduction and performance improvement of the wire-wrapped filter pipe,the well con-struction cost of brine extraction well can be effectively reduced.(4)The unit water inflow of the aquifer is relatively small.The water yield is large based on moderate sand control,and the opening rate of the filter pipe can be enlarged to 15％.(5)The recommended gravel particle sizes are 5～10 mm and 20～30 mm.(6)The recommended filling structure is multistage gravel filling structure with the filter material particle size gradually increasing from outside to inside can form a stable partition between the filter particles of dif-ferent sizes,and play a better effect that the outer filter material block the sand,and the inner filter material permeate the brine efficiently.
Qarhan Salt LakeBrine extraction wellWell body structureKey parameter
万方数据
维普
