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The Development And Application Of Associative Polymer Drag Reducing Agent For Oil Pipeline

Posted on:2015-02-08Degree:MasterType:Thesis
Country:ChinaCandidate:W C YueFull Text:PDF
GTID:2271330503955972Subject:Chemical Engineering and Technology
Abstract/Summary:PDF Full Text Request
In the long distance crude oil pipeline,adding DRA(drag reducing agent) is the most economic and effective method of improving pipeline transport,but currently, alpha olefin type of DRA applied in industry has a defect as poor resistance to shear degradation,taking into account that using the reversible association of polymer is able to solve this defect.In this paper, Octadecyl acrylate is used as the main polymerizable monomer, plus Styrene, Acrylic acid, Methacrylic acid and 1-vinylimidazole, and Azo-bis-isobutyronitrile(AIBN) acts as initiator, Methylbenzene acts as solvent. By solution polymerization reaction,a type of associative polymer DRA with reversible hydrogen bond association is synthesized, and by orthogonal experiment, the optimal synthesis conditions are determined.The polymerization degree and associating effect of reaction products are evaluated with IR,UV, thermal analysis, and rheological analysis. For the association type of DRA, the performance of drag reducation and shear resistance are investigated by indoor circulation pipe evaluation and simulative pipe pump shearing test. And the applicability of the association type of DRA is evaluated simply with comparison of alpha olefin type of DRA applied in industry in performance and cost.By indoor circulation pipe evaluation system, the relationship between the concentration of DRA, Reynolds number, and drag reduction ratio is investigated. As the concentration of DRA increases, the drag reduction ratio increases, but the growth gradually slow down and the drag reduction ratio tends to a stable maximum finally. The stable maximum is measured at 14.87 % when the testing velocity is 1.7 m·s–1 and theconcentration of DRA is greater than 2000 mg·L-1, and the theoretical maximum of drag reduction ratio is 19.03% by linear fitting of Virk empirical formula. Under the same concentration of DRA, as the change of Reynolds number, the drag reduction ratio has a optimum value, that the drag reduction ratio is maximal under this condition of the Reynolds number. As the concentration of DRA increases, the optimum value of Reynolds number increases, and the maximal drag reduction ratio also increases as opposed to the optimum value of Reynolds number.At this moment,DRA can bear the stronger turbulence.By simulative pipe pump shearing test, the performance of DRA’s shear resistance is investigated. Along with the increasing shear number, the viscosity of DRA declines gradually, but the range of reduction of the viscosity is not very large, that more than 85%of the initial viscosity still remains after a high-speed shear.During the evaluation of applicability of the association type of DRA, with comparison of alpha olefin type of DRA applied in industry in performance and cost, the results show that the association type of DRA is worse than alpha olefin type in the performance of drag reducation, but the association type of DRA is more better than alpha olefin type in the performance of shear resistance. Besides, there is no corrosive effect in the pipe for association type of DRA. In summary, the association type of DRA has certain application value.
Keywords/Search Tags:Drag Reducing Agent For Oil Pipeline, Hydrogen Bond, Association, Drag Reduction, Polymer, Shear Resistance
PDF Full Text Request
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