| Under the influence of offshore platforms space,Load-bearing and hydrophobic groups in the hydrophilic segment of hydrophobically associating polymer, speed up the dissolution rate of hydrophobically associating polymer and reduce the weight and covering areas of polymer injection technological process is become one of the key challenges of the large-scale implementation of polymer flooding in offshore oil field. The dissolution rate of hydrophobically associating polymer is speed up through mixing, cutting, drawing and polishing technology for this purpose, However, it has affected the properties of polymer solutions, reducing its oil displacement effect to some extent. The effects of solution temperature on polymer dissolution is pronounced, therefore, reducing its dissolution time by increasing hydrophobic associated polymer solution temperature on the basis of the accelerated dissolution technology will reduce the injury of hydrophobically associating polymer caused by mechanically accelerated dissolution and keep the properties of polymer solution stability, increase the displacement efficiency.On the basis of the accelerated dissolution technology in offshore platforms, using the temperature of oilfield produced water to dissolved the hydrophobic associating polymer. Waste heat utilization in offshore platform has been widely watched, the waste heat of platform is whether or not increase the temperature of hydrophobically associating polymer solution has become an important topic. It is with great potential in increasing the temperature of hydrophobically associating polymer by utilization of waste heat of offshore platform after the calculation and analysis of waste heat potential of offshore platforms. It will raise the temperature of injection water form45℃to95℃, even100℃under75%thermal conversion.The dissolving time of hydrophobically associating polymer solution drastically shortened as the temperature rises under the range of using waste heat to improve the solution temperature. However, polymer properties are affected as the dissolving temperature rising. When the soluble temperature is higher than80℃the viscosity retention rates, residual resistance coefficient and drag coefficient of the polymer solution has declined under the shear action.The fluid expansion and viscosity reduce for crude oil effects in which is similar as thermal recovery will make up the loss of polymer properties caused by high temperature in bohai heavy oil reservoirs. When the soluble temperature is higher than80癈, the loss of the polymer properties is increase while the oil displacement efficiency is in sharp decline. As the rising of the soluble temperature, polymer flooding recovery first increase and then reduce. Select the best soluble temperature80℃after comprehensive consideration of the soluble temperature and oil displacement efficiency.Offshore waste heat can accelerate the dissolution speed of hydrophobically associating polymer solution effectively. It provides a new method for solving the poor solubility of hydrophobically associating polymer. By using the heat energy of polymer solutions the hydrophobic associating polymer flooding recovery is further enhanced and provided a new idea for improving polymer flooding effect. Meanwhile it also make a rational use of oil and gas resources and meet the requirements of energy conservation and emission reduction. |
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