Research and application of chemical viscosity reduction technology for shallow heavy oil
In order to deal with shallow formation depth,high oil viscosity and low thermal efficiency for shallow heavy oil reservoirs,the viscous mechanism,viscosity-reduction mech-anism,viscosity reducer synthesis and performance evaluation are investigated.The molecu-lar dynamics are used to indicate the heavy oil viscous mechanism by π-π stacking of as-phaltene,in which,the surface stacking is dominant.The molecular structure of methyleugenol-acrylsmide-octadecyl acrylate is designed,and molecular dynamics shows that this viscosity reducer can effectively reduce π-π stacking of asphaltene and reduce the heavy oil viscosity.The viscosity reducer is synthesized from methyleugenol,acrylsmide,and octadecyl acrylate.The net viscosity reduction rate can reach 29.3%at the mass fraction of 1 000 mg/kg.The pilot test is conducted in Pai 601-20 block of Chunfeng oilfield.The daily oil production rate is raised by 11.0 t,the water cut is reduced by 6.0%and output-input ratio is 1.43∶1 after the viscosity reducer is applied.The pilot test proved the effectiveness and feasibility of the chemical viscosity reducer,which can provide theoretical guidance for chemical viscosity reduction technique.
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万方数据
维普
