Taking the heavy oil production liquid in a block of Liaohe oilfield as the research object, a compound viscosity reducer was formulated according to the current situation, and the effect of the ratio and amount of such viscosity reducer on the viscosity of heavy oil emulsion was studied. The emulsified viscosity reducing agent is composed of non⁃ionic surfactant Triton X⁃100 and zwitterionic surfactant dodecyldimethyl betaine (BS⁃12).The experimental results show that when the mass fraction of 1.6% Triton X⁃100 is added into the heavy oil alone, the viscosity reduction rate of the heavy oil can reach 75.93%; BS⁃12 with a mass fraction of 0.6% and Triton with a mass fraction of 1.6%. Triton X⁃100 is compounded by a volume ratio of 1∶1, and the viscosity reduction rate of heavy oil can be increased to 92.63%. In addition, when the complex system is added in a volume ratio of 1∶1∶1, weak alkali sodium carbonate with a mass fraction of 0.4% is added. After the aqueous solution, the viscosity reducing rate of heavy oil can be further increased to 93.14%, and the stability of the compounding system is also improved.

Using the OP⁃10 and L61 emulsifiers to configure different hydrophilic equilibrium values (referred to as the HLB),the viscosity test of heavy oil in the second area of the oil production plant of liaohe oilfield was carried out to find out the optimal HLB of the heavy oil.At the same time, FBRM was used to measure the viscosity of heavy oil, and the effect of droplet quantity and particle size on viscous oil viscosity was analyzed.For further study on the viscosity change mechanism of heavy oil emulsion, it can be used to provide reference for the process of heavy oil reduction.Test results show that:the HLB of the emulsifying agent added to the heavy oil emulsion was 9.0,the effect of viscosity is best.At this time, the number of droplet drops to stable, compared with other HLB emulsifiers, the quantity of emulsifier is obviously low, the droplet is evenly distributed and the emulsion is stable.

For the problem of erosion-corrosion in oil pipeline system, used ANSYS FLUENT software, by changed the inlet velocity, the particle mass flow rate and the particle diameter, conducted numerical simulation for flow field distribution and severe erosion area of 90° elbow pipe. The results show that: with the increase of inlet velocity, the pipe erosion rate increases gradually; with the increase of particle diameter, the pipe erosion rate decreases; with the increase of particle mass flow rate, the pipe erosion rate increases linearly; and there have interaction between the three erosion factors of inlet velocity, particle mass flow rate and particle diameter.

Pipeline crossing structure was very easy to be affected by the settlement of soil along the river, and effective preventive measures should be adopted to effectively prevent the damage to the crossing structure. The finite element model of pipeline crossing structure and soil interaction was established, and the stress change of pipeline span structure with the fixed bracket was established. It was found that the fixed bracket could effectively reduce the stress value of the pipeline when the span structure was affected by the settlement of soil mass, and the installation position of the fixing bracket was more prominent to reduce the stress value of the pipeline span structure. The results could provide a theoretical basis for the safety construction of pipeline crossing structure.

      The ice blocking could happen during the process of conveying products oil in the pipeline, because of the low temperature in north China in winter. The pipeline occurred ice blocking, not only oil transport was affected but also unnecessary damage of production was caused, and the potential safety hazard could exist when it became serious. Based on thenumerical simulation software FLUENT, the flow field distribution was calculated around the single and multiple ice blocks in products pipeline which were in different height. The research results showed that increasing with the height of the ice wall, the pressure difference of front and back produced nonlinear changes, the pressure distribution regularities of multiple ice also produced nonlinear changes. In the aspect of velocity, the velocity variation degree of front and back the ice block was relatively stable, but the velocity change process around the ice block was more obviously and layered effect was better, the speed distribution regularities of multiple ice blocks were similar to that of the single ice blocks.

The multiple orientation was developed and the spatial long distance noncontact measuring equipment adopting the technology of telescope，precision angle measuring scale, multidimensional adjustable tripod and mechanical connection. This equipment was simple in structure and reliable in performance. Its measurement accuracy reached 0.15%. it could not only be used to measure the distance between long distance objects which were not touchable by human beings because toxic, radioactive, high temperature, and carrying virus, but also be used as an experiment in colleges and universities. Thus was highly practically valuable.