In order to solve the problem that large quantities of heavy crude oil imported from Venezuela cannot be transported by pipeline at normal temperature after arriving at shore，the transportation technology research was carried out aiming at some key problems such as the quick prediction of diluted heavy crude oil viscosity,the stability and uniformity evaluation of diluted heavy crude oil and the determination of safe blending proportions under different transportation conditions，and a set of analysis method for transporting diluted heavy crude oil at normal temperature based on indoor blending experiments and assisted by simulation calculation was established.Based on the statistical analysis of basic physical properties of 16 kinds of imported light crude oils ,the indoor experiments of blending Venezuela heavy crude oil with three kinds of typical light crude oil oils respectively were carried out,and quick reference tables of viscosity of diluted heavy crude oils with different blend proportions were established by these indoor experiment data. As long as the viscosity of light crude oil at 20 ℃ was known, the viscosity of diluted heavy crude oil at different blending proportions and temperatures can be quickly determined by using these quick reference tables.The stability and uniformity of diluted heavy crude oil were tested by let stand tests.These tests show that the diluted heavy crude oil samples still keep good stability and uniformity after 10 days of standing.Taking Ridong pipeline as an example,the process of transporting diluted Venezuela heavy crude oil was simulated by self⁃developed calculation program, and a kind of method to determine the safe blending proportions and feasible operation plans was proposed.These research results can also support the safety operation of pipeline of transporting diluted heavy crude oil at normal temperature.

The mathematical model was developed to describe the physical process of batching cool and hot crud oil. The hydraulic and thermal variation process of Jinhua pipeline batching transportation of Jidong crude oil and imported crude oil was simulated by selfdeveloped calculation program. Different transportation schemes were compared to determine an appropriate operation scheme of Jinhua pipeline. The results showed after the number of batching transportation cycle reaches to 2 or 3, the suction oil temperature of the next station changed periodically. The batching transportation safety of cool and hot crude oil can all be improved by heating the front cool crude oil or increasing the throughput of hot crude oil. By comparing different scheme, the appropriate batching transportation scheme for Jinhua pipeline in winter was determined. 