Abstract:

The Dabei gas field, with the complex geological structure, the developed faults and fractures and the low matrix porosity and permeability, has the characteristics of high temperature and pressure, and strong heterogeneity. Under these complicated geological conditions, the reservoir characteristics are poorly described by the analytical well test with limitation. Based on the static data of the structure, the fault, the well pattern and the well logging data, the numerical well test geological model with the complex irregular boundary closed to the actual condition was established, the seepage model was established by the production data of the gas production wells, and the unstructured Voronoi mesh was generated and discrete. Meanwhile, by considering the influences of the interference from the adjacent wells, the reservoir physical property parameters revision, and the fault sealing property alteration, the numerical well test model comformed to the actual condition of the well block Dabei-102 was proposed. The result showed that, through the first research and the application of the numerical well test technologies in this block, the numerical well test analysis and the interpretation can exactly describe the feature of the pressure changes during the development of the gas reservoir in time and space, solve the problems of the communication, the fault sealing property and the interference of the inter wells in well block Dabei-102, and further deepen the understanding of the gas reservoirs. The research result helps for the production of the gas wells in well block Dabei-102.

Key words: Dabei gas field, numerical well test, communication of inter wells, fault sealing property, interference of inter wells