Evaluation and application of on-site high-efficiency scale inhibitor in oilfield

Abstract The field produced fluid in Xinjiang Oilfield has the characteristics of medium-high temperature, high salinity and high calcium and magnesium ion concentration, which makes the solubility of calcium carbonate decrease due to pressure change, temperature change and water quality intersection during the development process, and precipitates calcium salt solids, which affects the development effect. In view of the above problems, this paper evaluates the scale inhibition effect of calcium carbonate on the scale inhibitors commonly used in oil fields, and carries out the experimental research on the long-term stability, temperature, salt content and calcium ion concentration of the selected high-temperature scale inhibitor KL-2. The results show that when the concentration of KL-2 is 0.08 %, the scale inhibition effect on calcium carbonate can reach 95.35 %, and the scale inhibition effect can be maintained for more than 30 days. The factors such as temperature, salt content and calcium ion concentration all affect the scale inhibition effect of KL-2, among which calcium ion concentration has the greatest influence. The theoretical KL-2 scale inhibitor dosing template was applied in the field of Xinjiang Oilfield, combined with the continuous dosing of scale inhibitor by metering pump, the problem of salt precipitation was effectively inhibited, with incomplete statistics. In 2024, the total amount of treated liquid will be nearly 30000m 3 / d.