| Abstract:The Lower Shihezi Formation of Upper Paleozoic in Dongsheng Gas Field is a tight sandstone reservoir with good physical properties in some areas and natural production potential. There are problems of borehole wall instability and reservoir damage in the drilling process, and the reservoir damage caused by the combination of various factors hinders the release of gas productivity. Build capacity in order to further improve the reservoir nature, and increase the single well production, on the basis of reservoir permeability recovery rate, through the reservoir damage factors analysis, the introduction of drilling fluid invasion depth quantitative evaluation method, deepen the reservoir damage mechanism, has been clear about the low density, low water loss and soilless phase and strong sealing fluid countermeasure, Waterproof locking agent and tight pressure compound temporary plugging agent were optimized in the laboratory, and soilless compound temporary plugging high acid soluble drilling fluid was formed. Reservoir permeability recovery rate was increased to 91.11%, mud invasion depth was reduced by 46.28%, and the formed drilling fluid was promoted and applied in Jin66 well area, the average single well production was increased by 11%, and 3 Wells were realized natural production. Further study on the effect of efficient exploration and development of tight sandstone reservoirs in Dongsheng Gas Field. |