A novel micro-emulsion was prepared by mixing an oil-soluble viscosity reducer,which was screened to aim at improving the heavy oil properties of Shengli oilfield with water-soluble surfactant and co-surfactant.The st...A novel micro-emulsion was prepared by mixing an oil-soluble viscosity reducer,which was screened to aim at improving the heavy oil properties of Shengli oilfield with water-soluble surfactant and co-surfactant.The static viscosity reduction and oil washing performance of the micro-emulsion were investigated,and the field application of the microemulsion used as heavy oil displacement agent was also reported.Results showed that the micro-emulsion exhibited excellent viscosity reduction performance for the studied heavy oil samples.When heavy oil was mixed with 0.5%of the micro-emulsion,a stable oil-in-water heavy oil emulsion could be formed.After the content of the micro-emulsion was increased to 3.0%,the oil removing rate reached up to 80%.Field application of the micro-emulsion to the Pai-601-Ping-115 well and the Pai-601-Ping-123 well was shown to be effective by increasing the periodic oil production up to 203 tons.展开更多
Rheological properties of hydrolyzed polyacrylamide(HPAM)solutions were measured in oscillatory and flow shear.In oscillatory shear the storage and loss moduli increased as the concentrations of the solutions increase...Rheological properties of hydrolyzed polyacrylamide(HPAM)solutions were measured in oscillatory and flow shear.In oscillatory shear the storage and loss moduli increased as the concentrations of the solutions increased,but they decreased as salinity increased.The relaxation spectra were plotted using the Kontogiorgos method.As shown in the relaxation spectra,the number of density of segmental units increased at first and then the peaks shifted and split into several as the concentration increased.With salinity increasing,the number of motion units increase and the peaks of segmental units became broader.In flow shear tests,the curves of viscosity versus shear rate were fitted by a power law equation.The result showed that the flow behavior index decreased with increasing concentration,while it generally increased with increasing of salinity.Furthermore,the first normal stress difference increased as the concentration was increased,while it decreased as the salinity was increased.The first normal stress differences measured by the rheometer were compared with the first normal stress differences calculated by the Laun equation and the results showed that Laun equation deviates the experimental results.展开更多
基金This work was supported by the 13th Fiveyear Plan National Key Project of China(No.2016ZX05011-003-004 and No.2017ZX05049-003-008).
文摘A novel micro-emulsion was prepared by mixing an oil-soluble viscosity reducer,which was screened to aim at improving the heavy oil properties of Shengli oilfield with water-soluble surfactant and co-surfactant.The static viscosity reduction and oil washing performance of the micro-emulsion were investigated,and the field application of the microemulsion used as heavy oil displacement agent was also reported.Results showed that the micro-emulsion exhibited excellent viscosity reduction performance for the studied heavy oil samples.When heavy oil was mixed with 0.5%of the micro-emulsion,a stable oil-in-water heavy oil emulsion could be formed.After the content of the micro-emulsion was increased to 3.0%,the oil removing rate reached up to 80%.Field application of the micro-emulsion to the Pai-601-Ping-115 well and the Pai-601-Ping-123 well was shown to be effective by increasing the periodic oil production up to 203 tons.
基金This work was supported by open fund(PLN 1429)of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Southwest Petroleum University)the Natural Science Foundation(Project No.Province 596102A071)from the Sichuan Provincial Educational Department of China and projects material B026 and new material 046 from the Geological Research Institute of Shengli Oil Field,Sinopec Ltd.Corp.
文摘Rheological properties of hydrolyzed polyacrylamide(HPAM)solutions were measured in oscillatory and flow shear.In oscillatory shear the storage and loss moduli increased as the concentrations of the solutions increased,but they decreased as salinity increased.The relaxation spectra were plotted using the Kontogiorgos method.As shown in the relaxation spectra,the number of density of segmental units increased at first and then the peaks shifted and split into several as the concentration increased.With salinity increasing,the number of motion units increase and the peaks of segmental units became broader.In flow shear tests,the curves of viscosity versus shear rate were fitted by a power law equation.The result showed that the flow behavior index decreased with increasing concentration,while it generally increased with increasing of salinity.Furthermore,the first normal stress difference increased as the concentration was increased,while it decreased as the salinity was increased.The first normal stress differences measured by the rheometer were compared with the first normal stress differences calculated by the Laun equation and the results showed that Laun equation deviates the experimental results.
