关键词: 钻柱测试, 压袤, 试井分析, 不稳定试井

Abstract: In this paper, pressure decline reasons were analysed in drilling stem test. Pressure decline resulted from the for mation with non-flow boundaries, or the formation with matter characters changing bad in distant place from well, or dual medium reservoir, or multi-layered reservoirs with large difference in matter characters in DST. So long as shut in time was enough long the pressure decline resulted from the aforementioned reasons would vanish. Nonartesian well test data were interpreted with Horner’ s method and taking real flowing time to be Horner producing time. which might lead to pressure decline. it might v::mish with nonartesian well interpretation methods. Pressure decline was also caused by the two-layered reservoir with different pressure systems in DST.

Key words: Drilling stem test, Pressure decline, Well test analysis, Pressure transient test