|Abstract:Wa-38 heavy oil reservoir is the main block of Liaohe Xiaowa oilfield. By 2018, the block has been continuously developed for 27 years, mainly through steam stimulation and steam flooding. Combined with the development effect and comprehensive benefits, thermal oil recovery will continue to be the main development mode of Wa-38 block in the future period, and steam flooding is still the most important production measure. At present, steam flooding has been only used in the third section of Dongying group of Wa-38 block. Combined with the results of previous pilot test, the scope of steam flooding is considered to be extended. This paper based on the actual characteristics of the three steam flooding well groups with the expansion of Wa-38 block, further depicting the geologic body, carrying out the study of reservoir numerical simulation, and optimizing the operating parameters of steam flooding. Trying to improving the production increase effect of the steam flooding expansion scheme, ensuring oil field production scale.