Predicting and prevention asphaltene and wax deposition in oil production of the Bazhenov formation of the Priobskoye oil field
The development of the Bazhenov-Abalaksky complex in Western Siberia (the Yu0 formation) is one of the promising areas for the development of the Russian oil industry. Oil reservoir Yu0 Priobskoye field on physical and chemical properties related to light oil, it was found that the density of oil is mainly determined by the high content of light hydrocarbons and to a lesser extent a heavy component. The average content of paraffin - 4,0 %, resins - 5,3 %, asphaltenes - 0,6 % by weight, density - 839 kg/m3. The relatively high paraffin content causes possible risks of paraffin deposition. The paper presents the results of the forecast of complications associated with sediments asphaltenes and wax substances. It is shown that deposits of asphaltenes are predicted in reservoir conditions, and deposits in wells can form deposit of wax when the temperature oil is reached wax appearance temperature (WAT), and they are mainly related to the asphaltene or resinous-asphaltene group. The results of physical modeling confirmed the predictions made, in particular, the formation of asphaltenes in the reservoir and wax deposition in the conditions of oil production and transport. It is shown that the wax deposition is controlled by temperature and intensified at the flow temperature below WAT. Methods, technologies and reagents for prevention of asphaltenes and their removal formed on the surface of oilfield equipment are considered. Recommendations for the implementation of effective technologies and reagents, the results of a preliminary technical and economic assessment of the effectiveness of their implementation are given.