Investigation of the efficiency of the composition containing gossypol resin against corrosion and salt depositions

One of the important issues that need to be addressed in countries with a developed oil and gas industry is the effective fight against scaling and corrosion. At the same time, the development of inhibitors, compositions with multifunctional complex action against scaling and corrosion, testing in laboratory and field conditions remains an urgent problem arising from the requirements of the time. The presented article is devoted to laboratory tests of multifunctional compositions that prevent corrosion and scaling processes in the oil well collection and transportation system. The gossypol resin, a MARZA-2 inhibitor, kerosene, and diesel fuel were used in the preparation of the compositions. A year ago, twelve compositions (six in kerosene and six in diesel fuel) were prepared with different percentages of components and their physicochemical and technological properties were studied. It has been established that the studied compositions have the required viscosity scale and corrosion inhibitors, are stable at reservoir temperature, stable up to -40 °C and are homogeneous fluids compatible with formation waters and plugging solutions. Then the effectiveness of the prepared compositions against calcium carbonate salts and corrosion in laboratory conditions was studied. The model of formation water of well 326 of the Guneshli field was used as a research environment. The experiments were carried out in both reagent and reagentless media. The results of numerous experiments have shown that, in general, the compounds understudy have a complex action against scaling and corrosion. It is noted that the efficiency increases with a constant ratio of the amount of kerosene and diesel fuel in the compositions, an increase in the amount of the MARZA-2 inhibitor, and a decrease in the amount of gossypol resin. The highest efficiency against calcium carbonate deposits and corrosion was noted for the inhibitor of the complex action of salt deposition and corrosion K5, containing 99% corrosion inhibitor (CI) and 98% salt inhibitor (SI) per 100 mg/l, as well as C5, containing 100% CI and 99% IC at 100 mg/L. The initial optimal concentration of K5 was 40 mg/l (efficiency IC 92%, SI 91%) and C5 - 30 mg/l (efficiency IC 91%, SI 91%).