In view of excessive water yield of L block in Daqing oilfield, studies of activated water driving system were conduct in Xing-12 test block. Combined with block reservoir condition, suitable surfactants were selected, and optimization of driving system for activated water was carried out by the result of laboratory physical simulation experiment. It can be found that oil/water interfacial tension effectively decreased and oil recovery was enhanced with addition of surfactant. And injection pressure also rises up with increase of concentration of surfactant. In the laboratory oil driving experiment, the growth range of recovery ratio tended to slow down when the mass fraction of 1 ^# activated water exceeded to 0.08%. Eventually the paper combines with experiment results and methods of economic assessment, the oil driving system suitable for Xing-12 test block is screened out. That is the mass fraction 0.08% activated water prepared with betaine type surfactant and formation water, and optimal dosage is 0.25 PV.

Since R.M.Butler developed the vapor extraction of heavy oil and bitumen (VAPEX) technology，the VAPEX has been found many advantages such as low energy consumption and costeffective. In addition, the VAPEX can also avoid the production of greenhouse gases and upgrade the crude oil. In brief, the VAPEX has become a promising and practical technology. In order to evaluate the oil recovery rate in different steps and optimize the field operation condition, solvent gas diffusion of the VAPEX has been attracted more and more attentions. This paper analyzes molecular diffusion and dispersion of solvent gas in heavy oil and bitumen, provides an important mathematical relation, and achieves an mathematical model for improving yield of heavy oil and bitumen, providing theoretical support for exploration of VAPEX, and could also predict the processes of VAPEX in efficient way in the meantime.The prospective of VAPEX technology has been raised in this paper.