The Correlation Of Chemical Components Of Heavy Oil To Viscous Multiples And Research Of Viscosity Reduction

In this paper, we aim at the problem that the heavy oil of shengli oil field formW/O emulsion, resulting the viscosity greatly increased. At the same time, thestability of emulsion is larger. We study the association between the properties ofheavy oil and its emulsion viscosity ratio and the value of SV. Therefore, weaccording to the experimental sample, select suitable emulsification viscosityreduction agent, and optimize the conditions for viscosity. At last, we through doingthe micro morphology experiment of W/O emulsion and wax before and after addingviscosity reduction agent, determination IR, SEM, the molecular weight and dipolemoment of asphaltene and resin before and after adding viscosity agent, analyzing themechanism of viscosity reduction.Laboratory experiments determine the quantitative relationship of factors influe-ncing the emulsion viscosity ratio and stability of heavy oil. It is shown that: the deg-ree of association between the compositions of heavy oil, heteroatom content and me-tallic elements content to W/O emulsion viscous multiples from big to small are: asp-haltene(0.9918)>aromatic(0.9912)>resin(0.9905)>saturate(0.9857), O(0.9949)>S(0.9899)>N(0.9852), Ni (0.9919)>Fe (0.9780)>V(0.9779). The degree of association of t-he content of asphaltene, O and Ni are the bigest, so they are the main factor influenc-cing the w/o emulsion viscous multiples; the degree of association between the molec-ular weight and the mean dipolemoment of polar fractions of heavy oil, heteroatom c-ontent and metallic elements content to w/o emulsion viscous multiples from big to s-mall are: asphaltene(0.9889)>resin(0.9836)>aromatic(0.9810), asphaltene (0.9857)>r-esin(0.9794)>aromatic (0.9766). The degree of association between the compositionsof heavy oil, heteroatom content and metallic elements content to the SV value frombig to small are: aromatic (0.9939)>resin(0.9938)>saturate(0.9898)>asphaltene(0.9877), N(0.9944)>O(0.9857)>S(0.9796), Ni(0.9977)>Fe(0.9842)>V(0.9726); the degreeof association between the the molecular weight and the mean dipolemoment of polarfractions of heavy oil, heteroatom content and metallic elements content to the SV va-lue from big to small are:asphaltene(0.9890)>resin(0.9866)>aromatic(0.9715), resin( 0.9963)>aromatic(0.9940)>asphaltene(0.9861). Micro and interface properties experi-ments show that the smaller of the interfacial tension, the greater of the absolute valu-e of Zeta potential, at the same time, the greater of the acid value, the greater of the v-iscosity ratio. Therefore, the smaller the particle size of w/o emulsion, more concentr-ation of distribution, the SV value of emulsion is larger, but the SV value and viscosi-y ratio had no obvious relevance.Because of the key of the heavy oil exploitation is to improve liquidity, we selectsuitable emulsification viscosity reduction agent and optimize the conditions forviscosity. For sample shan56-4X4, OP-10is good. The best viscosity condition forOP-10is dosage of0.3%, emulsion moisture content of30%; For sample GB1×28,OP-10is good. The best viscosity condition for OP-10is dosage of0.1%, emulsionmoisture content of30%. Mechanism of viscosity reduction show that whether theviscosity reduction agent has the effect or not, we can judge from the followingseveral aspects: the emulsion of heavy oil from W/O reverse to O/W type; the moundshape between3000~4000cm-1of IR of resin and asphaltene peaks were decreased;the aggregation and state of wax crystal Changed; the structure of asphaltene loosed.