Abstract:

This paper shows the effect of steam flooding on pore structure and reservoir minerals in Lian-hua reservoir of Liaohe Gaosheng oil field based on lab simulation and core analysis.The pore structure of reservoir media are studied to compare with heat simulation experiments. Steam flooding will lead to the increase of porosity and pore diameter, and the decrease of pore throat and permeability. Thus, the heterogeneity of pore structure becomes more serious .Steam has strong effect on the microstructure of the clay minerals . The experimental tests prove that new minerals, such as smectite and zeolite, will be formed at 250℃. However, the heavy oil can easily carry fine particles(<4μm) ,and finally the content of smectite in reservoir will decline .The main factors of formation damage during the steam flooding are particle migration and swell of smectite.

Key words: Steam flooding, Petrophysical parameters, Pore structure, Clay mineral, Reservoir