Overview
Injection allocation structure: 4-level and 4-interval separate injection
Daily water injection volume: 37 m³/d
Abnormal conditions: Packer 2 was unsealed; Well XX showed a slight suction phenomenon in the annular space outside the separate injection string.
Logging Objectives
Verify the DAS response characteristics at the packer unsealing position under different water injection conditions.
Analyze the DAS response of micro-suction in the lower interval and clarify the minimum distinguishable flow rate of DAS.
Complexity of multi-parameter correlation analysis: The production status must be comprehensively determined by combining the DTS temperature curve, produced fluid-gas conversion, and liquid level changes, and data interpretation requires cross-stage dynamic correlation.
Logging Process Design
- Stable Testing Stage
Conduct continuous testing for 2 hours, and adjust the water injection volume to 30 m³/d → 20 m³/d → 10 m³/d in sequence.
- Well Shutdown Monitoring Stage
Continue measurement for 24 hours after well shutdown to observe the impact of flow rate changes on DAS signals.
