Productivity Testing Design Method of Multi-Factor Control for Unconsolidated Sandstone Gas Reservoir

Abstract

Reservoir safety, testing-string safety, and flow control are key factors that should be considered in deep-water unconsolidated sandstone gas well testing work system. Combined with the feature of testing reservoir, pipe string type and sea area, the required minimum testing flow rate during cleaning up process, as well as minimum test flow rate without hydrate generation, pipe string erosion critical production, the maximum testing flow rate without destroying sand formation and the minimum output of meeting the demand of development was analyzed; based on the above critical test flow rates, testing working system is designed. Field application showed that the designed work system effectively provided good guidance for field test operations; no sand production or hydrate generation happened during the test process; the test parameter evaluated the reservoir accurately; the safe and efficient test operation was achieved.