Sand production is one of the key problems restricting the safe and efficient exploitation of natural gas hydrate. The reservoir specimens were prepared according to the grain gradation of the natural gas hydrate reservoir in the South China Sea, and the ice grain was used instead of the natural gas hydrate. Through the self-developed laboratory model test device, the main factors that influence sand production from the reservoir during hydrate exploitation were studied. The variations of sand production amount of the reservoir, sand retaining and passing amounts of the sand prevention layer, and the permeabilities of the reservoir and sand prevention layer with different clay contents, depressurization amplitudes, and particle size of the sand prevention layer, were analyzed. The test results show that: (1) The higher the clay content reservoir was, the smaller the sand production amount of the reservoir, the smaller the sand retaining and passing amounts of sand prevention layer, the smaller the sand retaining rate, and the greater the sand passing rate of sand prevention layer, the smaller the extent of increase of permeability of reservoir, and the smaller the extent of decrease of permeability of sand prevention layer. (2) The greater the depressurization amplitude was, the greater the sand production amount of the reservoir, the greater the sand retaining and passing amounts of the sand prevention layer, the smaller the sand retaining rate, and the greater the sand passing rate of sand prevention layer, the greater the extent of increase of permeability of reservoir, and the greater the extent of decrease of permeability of sand prevention layer. (3) When the particle size of the sand prevention layer increased, the sand production amount of the reservoir changed very little, the sand retaining amount of the sand prevention layer decreased and the sand passing amount of the sand prevention layer increased, the sand retaining rate of sand prevention layer decreased and sand passing rate of sand prevention layer increased, the extent of increase of permeability of reservoir changed very little, and the extent of decrease of permeability of sand prevention layer decreased.
Jia Rui
,
Hao Daiheng
,
Xu Jingming
. Experimental Study on the Influencing Factors of Sand Production from the Reservoir during Hydrate Exploitation[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 692
-700
.
DOI: 10.20174/j.JUSE.2024.S2.21
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