Affecting Factors of Wettability and Viscous Oiliness of Shale Oil Gathering and Transportation Pipeline
The work aims to solve the uncertain problem of interface wettability and adhesion of oil gathering pipe. The contact angle between two kinds of shale oil and three kinds of pipes under the effect of temperature,water pre-lubrication,rust,surface energy and adhesion work was tested by a contact angle tester. The adhesion of two kinds of shale oil and produced water in steel pipe,coated steel pipe,and flexible pipe was tested under conditions of water pre-lubrication or temperature change with an improved drop test device. The results showed that the contact angle and the amount of adhesive oil between the three kinds of pipes and the oil phase decreased with the increase of temperature. The amount of adhesive oil in coated steel pipe decreased the most,the contact angle with the two kinds of shale oil decreased by 60.2° and 64°,respectively,and the adhesion thickness between the coated steel pipe and the two kinds of shale oil decreased by 1.45 mm and 1.16 mm,respectively. Pre-lubrication enhanced hydrophilicity,weakened lipophilicity and decreased oil phase adhesion of the three kinds of pipes. Pre-lubrication of coated steel pipes reduced the adhesive wall thickness of shale oil well 151# and well 020# by 1.35 mm and 1.13 mm,respectively. The wettability and flow friction of shale oil could be improved by heating or pre-lubrication of coated steel pipe. After corrosion,surface roughness increased and wettability changed. The contact angles between the steel pipe and 151# shale oil before and after corrosion were 91.5° and 63.8°,and the contact angles between the steel pipe and 020# shale oil were 90.5° and 42.7°,respectively. After corrosion,the steel pipe changed from oleophobic to lipophilic. The relationship between solid surface energy and adhesion work and contact angle was analyzed and it was found that the larger the surface energy and adhesion work were,the smaller the contact angle between solid and liquid was. The effect laws of different factors on the fluid-solid interface contact angle and adhesion of oil gathering pipelines are tested and analyzed,providing basic data and reference for the selection of oil field gathering and transportation pipelines based on wettability and adhesion,thus greatly reducing energy losses in the gathering and transportation process.
万方数据
维普
