After the XQ⁃45 block entering the multiple rounds of steam huff and puff, it is affected by edge water, faults, reservoir properties and other factors. The remaining oil distribution is complex, and steam huff and puff effect is getting worse. According to the reservoir dynamic data, the 79 wells in this block are divided into different types of heavy oil wells according to the remaining oil saturation parameters. Among them, the number of remaining oil wells affected by edge water is more than 22. As the edge water proceeds along the high⁃permeability layer to the oil well, the water content rises quickly and easily causes flooding. To further improve the effect of steam huff and puff, aim at the unutilized section in the edge water affected oil well, and take the single⁃layer steam huff and puff mode to study the optimization of steam huff and puff parameters affected by edge water. Through extract single⁃well geological model and compare different steam injection programs, the best program is selected: steam injection volume is 100 t/m, the oil steam ratio maintain at 0.2 t/t or more, obtain the maximum amount of oil production. The results show that cycle steam injection volume is 100 t/m, the oil production is the largest in the third cycle, and the sweep radius of steam reaches the maximum. After 5 rounds of steam huff and puff, cumulative steam injection volume is 3 700 t, cumulative liquid production is 4 500 t, cumulative oil production is 738.65 t, and the program implementation effect is getting better.

Gathering pipeline network adaptability evaluation, is to simulate the existing network when facing future possible working conditions, so as to assess its adaptability. Through numerical simulation, Canada Mackay River SAGD oil sand emulsion gathering pipeline network’s transient state is established, and Separated transportation and Multiphase transportation modes’ hydraulicthermal characteristic are analyzed, such as temperature dropping and pressure dropping. The result shows that the network based on the above two modes could satisfy the oil extraction and treatment requirement. For network corrosion issue, corrosion model is established to do the analog calculation. The result shows that in the separated transportation mode the carbon dioxide corrosion is severe, so multiphase transportation is recommended. Furthermore, the sand erosion prediction on pipeline elbow is calculated, the result shows that the erosion is not serious, network adaptability is good. The multiphase transportation and erosion analog calculation provides a accurate way of Canada SAGD oil sand gathering network adaptability evaluation, and it could be used for the network programming/updating/optimizing.

In order to acquire good viscosity prediction model to satisfy and control processes in petroleum and chemical industry, existing models were evaluated by absolute relative error at various viscosity ratios. Eight models were selected to be evaluated in this way. Each model’s prediction characteristics and accuracy were compared and recommendation was made according to different viscosity ratio. The result shows that Arrhenius, Bingham, Kendall model have a bad performance when applied to predict blend viscosity which is not recommended to use. Chevron model is recommended to use when viscosity ratio between 1 and 103. Cragoe model is better than others when viscosity ratio between 103 and 105. Whereas, no model has good prediction performance when viscosity ratio between 105 and 106. Thus, a new model is urgently needed to be developed.

The elastic-plastic finite element analyses of the internal pressure vessels with the different ratios of the diameter of nozzle to the diameter of vessel are carried out to investigate the stress concentration in the nozzle-vessel junction. The results show that the heaviest stress concentration is found at the interval nozzle-vessel junction of the longitudinal symmetry plane, while the stress concentration around the external junction is decrease because of the welded joint. In the process of loading, the stress around the junction linearly increases at first and then the range of the high stress area enlarges. The ratio of the diameter of nozzle to the diameter of vessel has greater effect on the distribution area of high stress in plastic deformation stage. Compared with large opening without nozzles, the stress concentrations around the junction are sharply reduced because of the nozzles.