Gas production test technology for shallow (extreme shallow) gas layer

High risks in well control and operation difficulties generally occur in gas production test job in shallow (extreme shallow) gas layer. In view of this, and on the basis of difficulty analysis, killing fluid system optimization as well as construction program design, in this paper comprehensive research is conducted on the systematic technology for gas production test while ensuring well control safety. So gas production test technology is developed, which is applicable to shallow (extreme shallow) gas layer in Dagang Oilfield. The key should be focused on first-order well control in shallow gas layer. After the gas layer is perforated, the stability in gas layer must be maintained before kicking well off operation, thereby, to effectively minimize such hazards in well control as overflow. This technology, with favorable field application prospect, is a reference for gas production test operation in similar gas wells.