CO₂ Flooding Scaling Trends And Control Techniques

Is mainly due to changes in fouling medium ion concentration, and the main factors causing the change is to change the temperature, pressure and PH. In many industries, the formation of scale in a variety of ways to remove the various ions, so that fouling problems significantly reduced or eliminated. However, this method is rarely applied in the field, because the oil field water consumption, high cost, and can not be removed by ion produced water in the wellbore below.Scaling problems caused by injecting carbon dioxide as a result of temperature and pressure changes. Crystal precipitation fouling process is fouling from the supersaturated solution, crystallization, polymerization and deposition process. It is not only associated with the solubility of a variety of factors chemical thermodynamics, crystallization kinetics, hydrodynamics, etc. will have an impact on fouling. While the flow rate is increased so that the degree of mixing of the solution increases, combined with each other to accelerate ions scaling, resulting in faster generation of nuclei.For on-site working conditions, according to the corrosion products and produced gas, water component analysis, a preliminary judge Jilin O ilfield water quality is very corrosive, scaling weak. Carbon dioxide is injected into the hearts of calcium on the rocks with a dissolution action, solubility at high temperature and pressure in the formation of small, easy to cause fouling problems.WAG when gas injection wells, as water, sewage, poor compatibility, high impurity content, as well as stop the injection process, impurities, scaling, corrosion products deposited into the bottom of the injection process, causing near-wellbore plug fouling, difficulties caused by the injection PHenomenon. In view of this situation, the development of a chemical plugging agents, this solution blocking agent has a good ability to clear the bottom of the scale, the protection of the safety injection wells running smoothly.To prevent harm scaling production wells, the paper preferred performance evaluation scale inhibitor, and screened out better performance scale inhibitor and corrosion better performance of CO2 corrosion inhibitor compound, has been scale and corrosion inhibitors are relatively good performance of complex-type corrosion inhibitors.