Recognition of low permeable volcanic rock gas reservoir early stage dynamic feature in Xushen gas field A block

The volcanic rock gas reservoir development is a hot spot in the natural gas exploration and development.Recognition of low permeable gas reservoir dynamic feature is a difficult spot.A block is rather big well area in scale in Xushen gas field,layer heterogeneity is strong,mainly are II and III type layer,which is a typical low permeable volcanic rock gas reservoir.Start with geological feature analysis of A block,combine with gas production test and short-term production test data analysis within the well area,carry on gas reservoir early stage dynamic evaluation,it is thought layer heterogeneity caused big difference in single well production capability,limited stability yield of low production gas well,pressure recovery velocity is slow,large change in well control dynamic reserve measured by different production degree and pressure recovery time in low permeable layer.A new mode has been proposed,which is fixed production and reduced pressure in high production well,periodically open and close well in low production stage,open well in turn and well replacement to realize block stability production.