Abstract
Acid treatments are one of the methods for intensifying oil and gas production. Corrosion is a significant factor affecting the performance of oilfield equipment. There are many different methods of preventing corrosion, but corrosion inhibitors are most commonly used in industry. The protective effect of the inhibitor is directly determined by the effective adsorption of surfactants on the metal surface. For an indirect assessment of the adsorption of the inhibitor, a comprehensive research method is proposed based on the determination of the interfacial tension of acid compositions and steel plates’ contact angle of wetting after corrosion tests. It was found that in hydrochloric acid the adsorption of the inhibitor IC-1 reaches a maximum after 6 h, an increase in the acid concentration in the range of 5–15% wt. has a negative effect on the activity of the inhibitor. For sulfamic acid, the maximum adsorption of the IC-2 inhibitor is observed after 24 h, an increase in acid concentration has a positive effect on surfactants.
Highlights
One of the methods for intensifying oil and gas production is acid treatment [1,2,3]
The authors of scientific articles [25,26] determined that there is a maximum decrease in the corrosion rate with an increase in the inhibitor concentration to critical micelle concentration (CMC)
The obtained CMC values made it possible to determine the concentration of inhibitors required to obtain high protective properties
Summary
One of the methods for intensifying oil and gas production is acid treatment [1,2,3]. The advantages of hydrochloric acid are its availability and low cost. It has a number of disadvantages, such as high reactivity [4], which does not allow acid to penetrate deep into the formation, high corrosion of steel [5,6], sediment formation, and secondary sedimentation. Sulfamic acid is currently a promising option for acidizing low-temperature carbonate reservoirs. Its application makes it possible to increase the efficiency of treatment of the bottomhole formation zone due to its lower dissolving capacity. The corrosion rate of steel, using acid compositions based on sulfamic acid, is several times lower than that of hydrochloric acid [7]
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