Study on Well Testing Model and Pressure Characteristics of Heterogeneous Composite Gas Reservoir

Aiming at serious heterogeneity of Sulige Gas Reservoir,this paper constructs a well testing interpretation model for lateral heterogeneous composite gas reservoirs.This model considers not only effect of skin effect and well bore storage effect,but also geologic characteristics and formation thickness change of gas reservoirs.It calculates pseudopressure in two typical conditions of infinite great and closed boundary,plots typical curve of bottom hole pressure drop,and analyzes the typical curve of each parameter.It interprets actual well testing data of gas wells using this model,and interpretation result is in accordance with actual status.