With the continuous demand of energy, more and more light crude oil was consumed while conventional crude oil production decreased year by year. Therefore, heavy oil as the effective supplement of conventional crude oil was gradually concerned by people. And how to efficiently and economically transport super heavy oil attracted people's attention. A light oilblending and transportation process for super-heavy oil used by an oil field were characterized. By using a RS300 viscometer and other instruments, the dieselsuper heavy blend for the viscosity-temperature and rheological properties, solidifying temperature and stability were studied. The results show that the volume fraction of diesel up to 25%, diesel fuel blended with super heavy oil freezing point was low. And the blend had good fluidity, stability, as well as the process had good economical efficiency. When the volume fraction of diesel oil was further increased, the freezing point was not changed.

Oil leakage caused by failure accident of submarine pipeline can harm marine environment and affect oil transportation. For different water flow velocities and leakage directions in the case of halfburial pipe, a 2D leakage under water model was calculated by flow filed analysis software FLUENT. The simulation results show that water velocities and leakage angles would effect oil diffusion underwater directly|greater diffusion would occur when oil leakage go against stream with 45°|with larger water flow velocity, more time would be spent for oil floating upon seaair surface, and larger effects on oil diffusion caused by leakage direction would be enhanced. The conclusions of the present work could provide reasonable basis to oil leakage emergency underwater .

In the case of determining the optimum dehydration temperature in the settling tank, the settling tank outlet temperature was obtained by a reverse operation based on the analysis of sedimentation tank of energy balance. One optimal mathematical model, which used fuel oil heating cost and additional insulation layers with different thickness of the total investment cost at least, was established and solved by C++ program. According to the optimized calculation, the optimal insulation thickness was about 68mm and the lowest total cost was about 1.456 3 million yuan.