Abstract:

Considering the phase change and percolation characteristics of deep condensate gas reservoirs with low permeability,such as Pu 67,Baimiao and Qiaokou condensate reservoirs in Zhongyuan oilfield,conventional and modern well test interpretation methods,applicable to these reservoirs,have been developed by integrating phase equilibrium computation process of condensate oil-gas system that take into consideration of physical and chemical interfacial effects,such as pore medium adsorption and capillary condensation,and condensate oil-gas two-phase percolation equations,as well as well test interpretation methods of homogeneous condensate gas reservoirs that are achieved through introducing linearization of condensate oil-gas two phase pseudopressure function and percolation flow equation.A case study of the influences of pore medium adsorption and capillary condensation on well test interpretation results has also been made.

Key words: low permeability, condensate gas reservoir, interfacial effect, well test analysis model, well test interpretation