为推广胶凝原油水力悬浮输送技术,搭建了挂壁原油冲洗实验系统,通过实验数据分析胶凝原油是否均匀挂壁、冲洗水量及冲洗时间等对冲洗效果的影响.实验结果表明,少数胶凝原油颗粒挂在管壁上用冷水冲洗效果为100%;胶凝原油大面积挂壁时,均匀挂壁冲洗效果较差,非均匀挂壁的冲洗效果有所改善.对于挂壁5 mm的油管,实验条件下,均匀挂壁油管冲洗效果在2.8%~5.9%之间,非均匀挂壁油管冲洗效果在9.5%~23.3%之间.

Wellhead back pressure is one of main control parameters for oil loop pipe safe transmission; its value has some relationships with metering plant water pressure, water temperature, water amount, liquid-producing capacity, oil return temperature, pipe diameter, wax deposition thickness and pipe length. In this paper, using temperature drop and pressure drop models for loop mixed transportation, the quantitative analysis was carried out about influence factors of wellhead back pressure, and control measures of stable loop gathering can be selected preferably by research results.

The pressure drop is the main parameter which influences the safe operation of the gelled crude oil hydraulic suspension transportation system.According to the current specification for design of oil and gas gathering and transferring rules three types of frictional resistance coefficient calculation model (Colebrook formula, Isaev formula and Atlas Schur formula), contrast and analyse the pressure drop values measured in gelled crude oil hydraulic suspension transportation and calculated with the model.The results show that the pressure drop calculated with Colebrook, Isaev and Atlas Schur formulas error exceeding 71%, and they are not suitable for pressure drop calculation of gelled crude oil hydraulic suspension transportation.So new methods for pressure drop calculation should be found .