Research on influencing factors for wax deposition behavior in G-13 oil well and preferred selection of wax-remover

In the process of G-13 well production, severe wax deposition often happens, leading to wellbore plug, production reduction and even shutdown of the oil well. It is necessary to analyze the wax deposition behavior and select suitable wax-removal agents. The composition of wax sample and viscosity- temperature curve was tested and the wax deposition profile in the oil well was calculated. The influencing factors were analyzed and then four chemical wax-removal agents were tested based on industry standards. The research results indicate that there are 60.94% organic components, of which heavy components such as gum, asphaltene, and paraffin accounting for 45.75%. Large concentration of heavy components in crude oil, low production gas-oil ratio, and low water content are main factors for wax deposition behavior in G-13 well. The selection experiments of wax removers show that B-oil based wax remover is recommended if the wax dissolution rate is the main consideration, and C-oil based wax remover can be selected for a best comprehensive performance. In addition, dissolution rate experimental method for on-site wax sample was innovatively designed and proposed. This research work has important guiding significance for the on-site wax removal process of the target block.