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ИССЛЕДОВАНИЕ ЭФФЕКТИВНОСТИ ПРОТИВ КОРРОЗИИ И СОЛЕОТЛОЖЕНИЯ КОМПОЗИТОВ, СОДЕРЖАЩИХ ГОССИПОЛОВУЮ СМОЛУ
Г.Р. Гурбанов, М.Б. Адыгезалова
Гусейн Рамазан оглы Гурбанов (ORCID 0000-0003-0167-5707)*
Кафедра транспорта и хранения нефти и газа, Азербайджанский государственный университет нефти и промышленности, Азадлыг 16/21, Баку, Азербайджан, AZ 1010 E-mail: [email protected]
Мехпара Бабаверди кызы Адыгезалова (ORCID 0000-0002-0966-2946)
Кафедра химии и технологии неорганических веществ, Азербайджанский государственный университет нефти и промышленности, Азадлыг 16/21, Баку, Азербайджан, AZ 1010 E-mail: [email protected]
Одним из важных вопросов, который необходимо решать в странах с развитой нефтегазовой промышленностью, является эффективная борьба с солеотложениями и коррозией. В то же время разработка ингибиторов, композиций с многофункциональным комплексным действием против солеотложений и коррозии, проведение испытаний в лабораторных и полевых условиях остается актуальной задачей, вытекающей из требований времени. Представленная статья посвящена лабораторным испытаниям многофункциональных составов, препятствующих процессам коррозии и солеотложения в системе сбора и транспорта нефтяных скважин. При приготовлении составов использовали смолу госсипол, ингибитор МАРЗА-2, керосин и дизельное топливо. Год назад было приготовлено двенадцать составов (шесть на керосине и шесть на дизельном топливе) с различным процентным содержанием компонентов и изучены их физико-химические и технологические свойства. Установлено, что исследуемые композиции обладают необходимой вязкостью и ингибиторами коррозии, стабильны при пластовой температуре, стабильны до -40 °С и являются гомогенными флюидами, совместимыми с пластовыми водами и тампонажными растворами. Затем была изучена эффективность приготовленных составов против отложений карбоната кальция и коррозии в лабораторных условиях. В качестве объекта исследования использовалась модель пластовой воды скважины 326 месторождения Гюнешли. Эксперименты проводились как вреагентной, так и в без-реагентной среде. Результаты многочисленных экспериментов показали, что в целом исследуемые соединения обладают комплексным действием против образования накипи и коррозии. Замечено, что эффективность повышается при постоянном соотношении количества керосина и дизельного топлива в композициях, увеличении количества ингибитора МАРЗА-2 и уменьшении количества госсиполовой смолы. Наибольшая эффективность против отложений карбоната кальция и коррозии отмечена у ингибитора комплексных действии отложения солей и коррозии K5, содержащего 99% ингибитор коррозии (ИК) и 98% ингибитор солей (ИС) на 100 мг/л, а также у С5, содержащего 100% ИК и 99% ИС на 100 мг/л. Начальная оптимальная концентрация K5 составила 40 мг/л (эффективность ИК 92%, ИС 91%) и C5 - 30 мг/л (эффективность ИК 91%, ИС 91%).
Ключевые слова: пластовая вода, госсиполовая смола, МАРЗА-2, состав, коррозия, солеотложение, керосин, дизельное топливо, эффективность, комплексное воздействие, оптимальная вязкость, карбонат кальция, ингибитор
Для цитирования:
Гурбанов Г.Р., Адыгезалова М.Б. Исследование эффективности против коррозии и солеотложения композитов, содержащих госсиполовую смолу. Изв. вузов. Химия и хим. технология. 2022. Т. 65. Вып. 12. С. 76-86. DOI: 10.6060/ivkkt.20226512.6623.
For citation:
Gurbanov H.R., Adigezalova M.B. Investigation of the efficiency of the composition containing gossypol resin against corrosion and salt depositions. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2022. V. 65. N 12. P. 76-86. DOI: 10.6060/ivkkt.20226512.6623.
INVESTIGATION OF THE EFFICIENCY OF THE COMPOSITION CONTAINING GOSSYPOL RESIN AGAINST CORROSION
AND SALT DEPOSITIONS
H.R. Gurbanov, M.B. Adigezalova
Huseyn R. Gurbanov (ORCID 0000-0003-0167-5707)*
Department Transportation and Storage of Oil and Gas, Azerbaijan State Oil and Industry University, Azadlig 16/21, Baku, AZ 1010, Azerbaijan Republic E-mail: [email protected]*
Mehpara B. Adigezalova (ORCID 0000-0002-0966-2946)
Department of Chemistry and Technology of Inorganic Substances, Azerbaijan State Oil and Industry University, Azadlig, 16/21, Baku, AZ 1010, Azerbaijan Republic E-mail: [email protected]
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 andfield 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 dieselfuel) 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 offormation 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%).
Key words: formation water, gossypol resin, MARZA-2, composition, corrosion, scaling, kerosene, diesel fuel, efficiency, complex effect, optimal viscosity, calcium carbonate, inhibitor
INTRODUCTION
Currently, the main energy source for humanity, which is at a technologically advanced stage, remains oil due to its physical and chemical properties. Countries of the world with developed oil industries
produce millions of tons of oil every day. Electrochemical corrosion processes caused by asphaltene-resin-paraffin deposits, salt deposits, corrosive media, and microorganisms in the production, storage, treatment, and transportation of oil through pipelines create complex problems petroleum engineers. This is because
that the above factors cause premature failure of the lifting pipes of the elevator, oil-well tubing, rod pumps, injection lines and other linear pipelines, tanks, oily pipelines and main pipelines at all stages of the collection, and transportation system. Problems caused by scale, and corrosion aggression leads to failure not only of equipment, devices, pipes, etc., made of precious metals and their alloy, but also violate the ecological balance of nature. It should be noted that the growth of oil production and refining since the end of the twentieth century has exacerbated the problem of salt deposition and corrosion in general.
In the countries of the world oil industry, up to five times more formation, water is extracted than produced oil. This amount is even higher if we consider the injection of water into the reservoir in the reservoir pressure maintenance system. As you know, formation waters, being electrolytes, contain hydrogen sulfide, carbon dioxide, oxygen, microorganisms, mineral salts of various compositions, including sodium chloride, calcium chloride, magnesium chloride, sodium carbonate, sodium bicarbonate, calcium bicarbonate, sulfates, sulfides, boron compounds, organic substances (compounds of naphthenic acid, etc.). Iron, aluminum, and silicon oxides are also found in some formation waters. It is known from the composition of associated water that it plays the role of both an agent of scaling and electrochemical corrosion of oil field equipment [1-2].
Protecting metal equipment used in the oil industry from corrosion and scale is an urgent issue. The combined damage caused by these problems to the global economy amounts to billions of dollars a year. As mentioned above, corrosive elements in the composition of oil and formation water lead to equipment corrosion during operation. On the other hand, the presence of sulfate-reducing bacteria in such an environment intensifies the process, and increases the rate of electrochemical corrosion of equipment. As a result, the oil industry suffers both economic and environmental damage.
The presence of hydrogen sulfide in associated water is considered very dangerous for plants and equipment. This is because that hydrogen sulfide, in addition to its high reactivity also acts as a catalyst for the formation of hydrogen embrittlement of metals.
Although the process of corrosion of metals in hydrogen sulfide environments is currently widely studied by researchers, namely, in the oil industry, research and solutions to this problem has both practical and economic significance. On the other hand, it is known that seawater, reservoir water, and freshwater are injected into the reservoir to maintain reservoir pressure. Microorganisms or bacteria in these waters
penetrate the formation. The most dangerous of these microorganisms in terms of corrosion are sulfate-re-ducing bacteria (SRB). One of their main features is the ability to adapt to any extreme conditions. SRBs grow and multiply very quickly when conditions are favorable. SRBs can also develop in an oxygen-free environment. They increase the environment's corro-siveness by reducing sulfate ions (SO42") to sulfite ions (S2-). In addition to drastically reducing the conductivity of the bed, SRB also increases the corrosion rate of oil field equipment. This, in turn, leads to a reduction in turnaround time and decreased productivity [3-8].
It should be noted that since Azerbaijan has developed oil and gas production, oil and gas processing, petrochemical and chemical industries, corrosion of metal structures and equipment used in these industries is one of the most serious problems for our country. Depending on the environment, along with the corrosion process, other processes occur, which in turn makes it difficult to solve the problem. This is especially acute in the oil industry. Thus, corrosion in oil production, storage and transportation systems occurs rapidly in the presence of microorganisms and salt deposition processes.
As mentioned above, during the development and operation of oil fields, the formation of the reservoir and injected water in the well product is inevitable, which occurs at a relatively high rate during field irrigation at the final stage of development. Namely, the water cut of the produced product leads to the formation of salt deposits. The problem of salt scale formation is considered a constant companion of the oil production process both at the initial and final stages of field development. Scale formation during the development and operation of oil fields is a rather complex and multifaceted process associated with natural and technogenic phenomena. Associated water is the main source of salt deposition in oil production. This is due to its re-saturation with poorly soluble salts, which occurs under the influence of changing production conditions - temperature, pressure, the concentration of salt-forming ions and other factors.
Injection of sulfuric acid into oil wells to increase the oil recovery factor, in turn, leads to a significant increase in the number of sulfate ions in the formation water, which leads to the formation of hardly soluble salts of barium sulfate (barite) and calcium sulfate (gypsum, anhydrite). If we compare the distribution zones of wells complicated by barite and gypsum deposits and the zones of sulfuric acid injection, it seems that these zones in the field overlap. Thus, the introduction of sulfuric acid into the productive stratum affects the processes of salt deposition. In addition,
the injection of sulfuric acid changes the properties of the oil. When this acid reacts with oil, sulfate resin is formed. Rather, the content of resins and asphaltenes in oil increases, which are also considered natural oil surfactants and can also affect the scaling processes in wells. Scale formation begins when the state of any natural solution is disturbed by an increase in the solubility of one or more components. The solubility of the minerals has a complex relationship with temperature and pressure. Typically, an increase in temperature leads to an increase in the solubility of various minerals in the water. Most ions dissolve at high temperatures. A decrease in pressure also leads to a decrease in solubility. However, not all minerals are subject to typical temperature dependence.
Oil production processes are accompanied by the formation of solid deposits of mineral salts in the drilling zone of production wells, walls of tubing and production strings, pumping equipment, ground communications of oil treatment and storage systems. Formation water is the main source of scale formation along with oil. In operating conditions, when the product is watered, wells and surface equipment are subject to scale deposition. Precipitation of mineral salts in solution occurs when the concentration of these substances and ions in the solution exceeds equilibrium.
Operational processes are disrupted due to the fact that salt deposits partially or completely cover the cross-sectional areas of the pipes. For oil field practice, this means the loss of oil and a significant rise in its cost due to extensive repairs. In the oil industry, the main challenge is to improve oil production efficiency, storage, and transportation. One of the main directions in solving this problem is the fight against the deposition of mineral salts.
There are numerous information in the practice of local and foreign oil fields on the study of the causes, mechanisms, and kinetics of the formation of solid salt deposits on the surface of the ground and underground equipment, in the area of drilling of production wells, field oil gathering pipelines, measuring instruments, and oil treatment plants, as well as in maintenance systems of reservoir pressure.
Prevention of scale formation in wells, oil storages, and plants is the main direction of control against this process. Different approaches can be used to solve this problem depending on the nature and conditions of field development and technical means. Despite the variety of means of controlling salt deposits, the main method for preventing scale formation is special chemical reagents and scale formation inhibitors.
In the literature, it is recommended to use hydrochloric acid to prevent scale formation on the pipes'
inner surface. However, this method does not prevent scale build-up during operation and can only be used after the scale has formed. There is also a method for separating mineral salts in the composition of formation waters inside the well to prevent the scale, and then removing these salts to the surface together with the well product. However, some shortcomings of this method do not allow to effectively use it in production.
Modern scale inhibitors, used in industry, are mainly composed of phosphorus compounds, some of which are very toxic. For example, oxyethylene di-phosphonic acid, a widely used as scale inhibitor, is highly irritating to mucous membranes and human skin. It also has teratogenic and embryotropic effects. In addition to the direct effects on personnel's health phosphorus compounds are also considered very harmful to the environment. Corrosion inhibitors in the oil industry usually include organic compounds and compositions based on them [9-19].
At present, for the simultaneous prevention of scale deposits and corrosion of oil field equipment, a chemical method using inhibiting compositions is considered an effective method. The development of non-toxic, high-perfomance compositions also plays a key role in solving environmental problems.
Thus, the creation of complex effective compositions with a high anti-scale and anti-corrosion the effect remains an urgent problem not only in our country but also in developed oil countries. Of course, despite some difficulties in creating such reagents, it is desirable to continue research in this direction. This is because the most effective and technologically advanced method of combating corrosion and deposits of mineral salts is the use of chemical reagents. Currently, the global oil industry has a rather large range of corrosion and scale inhibitors. The main condition for preventing corrosion and scale of inorganic salts in the equipment of wells and pipelines is the correct observance of the requirements and rules for choosing inhibitors and technologies for their use.
By the nature of the scale inhibitors and the mechanism of action on saturated solutions, they are divided into three types: blocking, complexing and mixed reagents.
Reagents of the first type form a protective coating on the surface of the centers of the salt crystals, weakening the speed of their growth, blocking the merging of crystals with each other, the deposition of salts on the surface of the equipment. The second type of reagents prevents the accumulation of crystals of solid salts on the surface of the metal due to the formation of water-soluble anionic complexes or chelate-
type complexes with cations of alkaline earth metals in the formation of water. The third class of scale inhibitors combines the properties of both types of reagents.
As a rule, to ensure effective protection of field equipment, chosen for this condition, corrosion and scale inhibitors should constantly be present in the system in the required quantity. Also, to achieve the maximum protective effect, the basic condition is the addition of corrosion reagents and mineral salts to the moment of crystallization [21-24].
The aim of the study is the development of the composition with a complex action against scaling and corrosion with the participation of the plant-based gossypol resin and the study of the effectiveness of protection in laboratory conditions.
METHODOLOGY EXPERIMENT
The main requirement for corrosion and scale inhibitors in the oil industry is their high protective ef-
fect. It should also be noted that technological characteristics of the reagents do not play a final role in assessing their overall effectiveness and significantly affect the choice of inhibitor. Depending on the conditions of application, different requirements may be imposed on the physicochemical and technological characteristics of chemical reagents. For this reason, the study of their physicochemical and technological properties is one of the most important requirements for the development and selection of reagents in the laboratory.
At the initial stage of research in the laboratory was prepared twelve compositions of the different compound, including MARZA-2, gossypol resin, kerosene, and diesel fuel as scale and corrosion inhibitors with a complex effect (Table 1 a, b). MARZA-2 inhibitor is a triple-bonded organic compound that contains carbon, hydrogen, oxygen, halogen, etc. element retains atoms [7]. Gossypol resin is an herbal inhibitor and an intermediate in the production of cottonseed oil [25].
Table 1
Composition and brand of composites
№ Components included in the composition The amount of interest in the The brand of the com-
composite,% posite
a
1 MARZA-2 + gossypol resin + kerosene 5:45:50 CESC1 - C1
2 MARZA-2 + gossypol resin + kerosene 7:43:50 CESC1 - C2
3 MARZA-2 + gossypol resin + kerosene 9:41:50 CESC1 - C3
4 MARZA-2 + gossypol resin + kerosene 11:39:50 CESC1 - C4
5 MARZA-2 + gossypol resin + kerosene 13:37:50 CESC1 - C5
6 MARZA-2 + gossypol resin + kerosene 15:35:50 CESC1 - C6
b
1 MARZA-2 + gossypol resin + diesel fuel 5:45:50 CESC1 - S1
2 MARZA-2 + gossypol resin + diesel fuel 7:43:50 CESC1 - S2
3 MARZA-2 + gossypol resin + diesel fuel 9:41:50 CESC1 - S3
4 MARZA-2 + gossypol resin + diesel fuel 11:39:50 CESC1 - S4
5 MARZA-2 + gossypol resin + diesel fuel 13:37:50 CESC1 - S5
6 MARZA-2 + gossypol resin + diesel fuel 15:35:50 CESC1 - S6
The following physical, chemical, and technological properties of the prepared compositions are defined.
Determining the appearance of composition. The inhibitor's appearance is determined visually on a white background in a test tube of colorless transparent material. To do this, 30 ml of the tested regent was added to the appropriate test tube, and the color was determined in the conductive light. The inhibitor responds to the requirements of color homogeneity, absence of suspended and precipitated particles in the composition.
Determination of composition density. Areometers were used for determination the density of the
composition at a temperature of 200 according to the method given in [26]. In this case, a 300 ml volumetric flask was filled with 250 ml of reagent and placed in a thermostat. When the inhibitor's temperature was 20 °C, an aerometer was inserted into the cylinder, and the readings were recorded in 60 s.
Determination of the kinematic viscosity of the composition. Kinematic viscosity was determined by the rule given in [27]. Viscosity was determined on the viscometer Reotes-2 in the temperature range +20 °C - (-30 °C).
Determination of thermostability (thermal resistance) of the composition. The determination of the heat resistance of the reagent is based on its storage
in the heating chamber at room temperature for 24 h. The thermal stability of the composition was determined visually. During the process, the color of the reagent, its stratification, and the number of foreign substances and particles suspended in the medium and deposited at the bottom of the test tube, were determined.
Determination of the freezing point of the composition. The determination of the the composition's freezing point was carried out according to the method described in [28]. In this case, the test reagent was placed in a cryostat, and its fluidity was visually recorded at every 3 °C. It has been found that the freezing point of the compositions varies from -30 °C to 40 °C.
Determination of the hydrogen index (pH) in the composition. The hydrogen content in the reagents was determined using a pH meter. The measurement of the potential difference between a glass electrode and a silver chloride reference electrode is the basis of the pH determination method. The electrodes are immersed in the reagent, mixed with a magnetic stirrer until a stable pH value is determined. The test liquid temperature 20(±1) °C. As a result of the analysis, the arithmetic average of the results of two parallel definitions was taken, and it was found that the difference between them did not exceed 0.1 pH.
Compatibility evaluation of composition with the model of formation water.
The inhibitor solution was added to a test tube with 10 ml of saline water using a pipette through the dosimeter; the inhibitor's concentration in the resulting mixture was 50 g/l. Then, after thorough mixing of the mixture, the tube was closed with a stopper. The tube was first stored in the heat chamber at 20 °C and then at 90 °C for 3 h.
The absence of sediment at the bottom of the tube and colloidal particles suspended in the solution after thermostating, and the absence of stratification in the sample, suggest that it is compatible with the formation water model.
Determination of the compatibility of the composition with the plugging solution. Evaluation of compatibility of prepared compositions with a plugging solution was carried out with a mixture of solutions KCl (= 1.16 g/cm3), NaCl (= 1.18 g/cm3), CaCh (= 1.32 g/cm3). The inhibitor concentration in the resulting mixtures was 20, 30, 40, 50, 70, 100, 120 mg/l, respectively. To assess reagent's compatibility with the plugging solution, the required volume of plugging solution was poured into the test tube using a pipette, the reagent tested with the dosimeter was added. After thorough mixing, the tube was closed with a cork. The tube was first stored in the heating chamber at 20 °C for 3 h and then at 90 °C at the same time.
The absence of sediment and colloidal particles suspended in the solution at the bottom of the test tube after thermostating, as well as the absence of stratification in the sample, suggest that it is compatible with plugging solution.
To assess the complex effective protective action of the compositions against salt deposition and corrosion, a model of the formation water of well, 1802 of the NGDU "Bibiheybatneft" field was prepared in the laboratory (Table 2).
Table 2
Ionic composition of formation water of well 1802
of the NGDU "Bibiheybatneft" field Таблица 2. Ионный состав пластовой воды скважины 1802 месторождения НГДУ
№ Ions Ions concentration, mg/l Equivalent concentration of ions, mg-eq/l Equivalent amount, %
1 Na++K+ 31298.987 1304.12 46.57
2 Ca2+ 1122.24 56 1.9998
3 Mg2+ 486.4 40 1.4284
4 Fe3+ 2561.58 853.86 -
5 Cl- 49010.49 1382.52 49.37
6 SO42- 28.81 0.60 0.0214
7 CO32- 0.00 0.00 0.0000
8 HCO3- 1037.00 17.00 0.6071
As can be seen from the table, the formation water of well 1802 of the NGDU "Bibiheybatneft" field is sodium-hydrocarbonate water of the first category of salinity. The procedure for determining the protective properties of complex effective scale and electrochemical corrosion inhibitors was carried out in the following sequence.
Methodology for determining the effectiveness of protecting compositions against calcium carbonate salts. This technique is based on evaluating the properties of the compositions to "hold" calcium cations in solution. The effectiveness of reagent protection was determined for their concentrations of 20, 30, 40, 50, 70, 100, 120 mg/l. Initially, two solutions were prepared to contain 1% inhibitor, 20% potassium hydroxide, trilon B solution, and murexide indicator, as well as calcium carbonate A and bicarbonate anions B to prevent calcium carbonate deposition in the reservoir water model.
Solutions of the 1% inhibitor were prepared by dissolving one gram of the reagent sample in distilled water in a 100 ml volumetric flask, 20% potassium hydroxide by dissolving 20 g of a potassium hydroxide sample in distilled water in a 100 ml volumetric flask and 0.05 N trilion B by dissolving 1 mol of the standard
titrimetric substance in distilled water in a 2 l volumetric flask. Fine grinding one also prepared the murexid indicator part murexid and 50 parts sodium chloride crystals in a porcelain mortar.
In the next step, anti-scale tests in the following sequence:
- 50 ml of solution A was poured into a test tube and placed in the test chamber and added 1% solution of the composite of the given concentration (in one of the test tubes for comparison the reagent was not added). Then in test tubes in turn added 50 ml of solution B, the lids were closed, stirred and kept in the thermobath at the formation temperature for six hours.
- At the end of the period, after cooling the tubes to 25 °C, the liquid inside the flask was filtered through a filter paper and determined the remaining amount of calcium ions in the filtrate. To do this, 10 ml of the test solution was pipetted and poured into a conical distillation flask, then 25 ml of distilled water, 1.5 ml of potassium hydroxide solution and 10-15 mg of mu-rexide indicator were added. Titration process with 0.05 N the solution of Trilon B was continued until the color of the original solution completely disappeared, or, more precisely, until the raspberry color changed to purple. The number of calcium ions (mg/l) in the filtered the solution was calculated by the following expression.
[Ca+2]
+21 _ VtrB • CtrB • 20,04
V fc
1000
where: VtrB - volume of trilon B, used for titration, ml; CtrB - density of trilon B solution, mg/l; V k - sample volume taken for analysis, ml; 20.04 - equivalent amount of calcium, g/mol.
The protective effect for the specified concentration of the composition was calculated according to the following formula.
(C1-C2) -C2)
100
where: Zs - protective effect at scaling inhibitor,%; Ci - the amount of calcium ions in the sample with the inhibitor after cooling, mg/l; C2 - the amount of calcium ions in the "hot" control sample, mg/l; Co - the amount of calcium ions in an empty "cold" sample before deposition, mg/l.
By dividing the calcium ion concentration in the prepared solution A into two, the calcium ion concentration in the initial sample ("empty" sample) before deposition was determined.
Thus, the study's final result was the average algebraic value of two parallel tests (the difference between the values of parallel tests was less than 4%).
Methodology for determining the effectiveness of corrosion protection of compositions. To
study the corrosion intensity in the formation of water, samples of steel Ct 3 were used.
To determine the corrosion rate of steel plates Ct3 size 30x20x1 mm by weight loss, studies were conducted in the laboratory for 24 h at a temperature of 25 °C.
Steel plates Ct3 were polish on a polishing machine, cleaned with acetone and alcohol, and weighed on analytical scales. The experiments were conducted in parallel in the same conditions for comparison, both without the composite and with the composite's addition.
Upon completion of laboratory tests, the steel plates were removed from the medium, and the surface was cleaned of corrosion products. For this plates were cleaned with a cotton swab in a solution of 10% hydrochloric acid and 40% formalin, washed with running water, and dried in acetone. The plates were kept in the desiccator for 10-12 h to stabilize the weight as before and after the experiment. Then the plates were weighed again.
The corrosion rate was calculated based on the following mathematical expression.
K = mi - m2 s-t
where m1 - pre-test mass of the sample, g; m2 - sample mass after removal of corrosion products, g; S - sample area, m2; t - duration of the test, hour, Kmh. - corrosion rate in the presence of composite (g/m2-h).
The protection (Z) effect of the composites was calculated according to the following formula
Zc =
Kn-K
Kn
■100%
were, Zc - protective effect at corrosion, K0 - corrosion rate in the medium without composite, K - corrosion rate in the composite environment (g/m2-h).
The composites'anticorrosive action was determined in the medium of the formation water model +143 mg/l hydrogen sulfide.
RESULTS AND THEIR DISCUSSION
In the laboratory, comprehensive tests were carried out to evaluate the effectiveness of 12 composites against calcium salts and corrosion to select the composition for use in the oil industry and determining the optimal density. The results are presented in Tables 3 and 4.
Based on the results of the experiments presented in the tables, it was determined that:
1. The components CESCi - C1, CESCi - C2, CESCi - C3, CESCi - C4 and CESCi - S1, CESCi - S2, CESCi - S3, CESCi - S4 have a complex protective
effect against corrosion and calcium deposits less than 90%, that does not meet the requirements for complex action reagents.
2. Compositions CESCi - C6 and CESCi - S6 have a protective effect more than 90% from corrosion and scaling simultaneously only at concentrations of 100 mg/l.
3. Compositions CESCi-C5 and CESCi-S5 in all studied concentrations (In addition to 120 mg/l) act comprehensively against corrosion and scaling. The maximum effectiveness of CESCi-C5 and CESCi-S5 is observed at concentrations of 100 mg/l.
According to the results of laboratory tests, studies were conducted for concentrations of 20, 30, 40, 50, 70, 100, 120 mg/l, to determine, at what concentrations, the initial protective effect is not less than 90% in the composition CESCi - C5 and CESCi - S5.
Table 3
The results of experiments on the effectiveness of the composition of CESCi against calcium salts and corrosion (solvent - kerosene) Таблица 3. Результаты экспериментов по эффективности состава ИКДСК против солей кальция и коррозии (растворитель - керосин)
Notes: Ci - corrosion inhibitor SI-salt inhibitor
Примечание: CI - ингибитор коррозии, SI - солевой ингибитор
Table 4
Results of experiments on the effectiveness of the composition of CESCi against calcium salts and corrosion
(solvent - diesel fuel) Таблица 4. Результаты экспериментов по эффективности состава ИКДСК против солей кальция и коррозии (растворитель - дизельное топливо)
Table 5 and table 6 presents the results of the study of the effectiveness of the protection of compositions CESCi - C5 and CESCi - S5 against the deposition of calcium carbonate.
Table 5
Protective action of the composition CESCÏ-C5 against calcium salts Таблица 5. Защитное действие композиции -_ИКДСК K5 от солей кальция_
№ Concentration, mg/l Protection effect,%
1 20 85
2 30 89
3 40 91
4 50 93
5 70 96
6 100 98
7 120 90
Table 6
Protective action of the composition CESCi - S5 against
calcium salts
Таблица 6. Защитное действие композиции ИКДСК-_C5 от солей кальция_
№ Concentration, mg/l Protection effect,%
1 20 88
2 30 91
3 40 93
4 50 96
5 70 98
6 100 99
7 120 90
As can be seen from the table, there is a gradual increase in their protective action (In addition to 120 mg/l) as the concentration of both composites increases from 20 mg/l to 100 mg/l. The protective effect of CESCi - C5 in the range from 40 mg/l to 100 mg/l and CESCi - S5 range from 30 mg/l to 100 mg/l is more than 90%.
At the next stage, the anticorrosive effect of the composition CESCi - C5 and CESCi - S5 was determined at the above concentrations (Tables 7 and 8).
Table 7
Anticorrosive effect of the composition CESCi -C5 Таблица 7. Антикоррозионное действие состава ИКДСК-К5
Con- The effectiveness of the composition
cen- CESCI CESCI CESCI CESCI CESCI CESCI
tra- S1 S2 S3 S4 S5 S6
tion, С1, SI, С1, SI, С1, SI, С1, SI, С1, SI, С1, SI,
mg/l % % % % % % % % % % % %
50 60 59 74 63 83 69 87 74 94 96 86 85
70 65 63 81 69 85 72 88 79 97 98 89 88
100 69 70 84 76 88 79 90 83 100 99 93 92
120 67 69 81 89 86 88 87 81 89 90 88 90
№ Concentration, mg/l Protection effect,%
1 20 86
2 30 90
3 40 92
4 50 92
5 70 95
6 100 99
7 120 89
Con- The effectiveness of the composition
cen- CESCI CESCI CESCI CESCI CESCI CESCI
tra- C 1 C 2 C 3 C4 C 5 C 6
tion, С1, SI, С1, SI, С1, SI, С1, SI, С1, SI, С1, SI,
mg/l % % % % % % % % % % % %
50 58 56 71 60 80 65 86 71 92 93 85 83
70 64 61 78 66 83 70 89 75 95 96 88 87
100 67 65 82 73 84 75 90 79 99 98 92 91
120 65 63 79 70 80 71 88 75 89 90 89 88
Table 8
Anticorrosive effect of the composition CESCi -S5 Таблица 8. Антикоррозионное действие состава
As can be seen from table 8, the composition of CESCi -C5 demonstrates a corrosive efficiency of less than 90% at concentrations below 40 mg/l. However, a further increase in concentration allows increasing the inhibitory effect to 92-9 mg (excluding concentrations of 120 mg/l). The composition CESCi - S5 (table 9) has an effect of less than 90% at concentrations of 20 mg/l and 120 mg/l. In the range of concentrations from 30 mg/l to 100 mg/l, the reagent's protective effect against corrosion varies from 91 to 100%.
Thus, numerous laboratory studies have shown that the initial optimal effective concentration of not less than 90%, which has a simultaneously complex effect on calcium carbonate deposits and electrochemical corrosion is 40 mg/l for CESCi -C5 and 30 mg/l for CESCi -S5 (Fig. 1 and 2).
105 -
Sn 100
20 30 40 50 70 100 120 concentration, mg/l
Fig. 1. Generalized results of protection efficiency of CESCI -C5 Рис. 1. Обобщенные результаты эффективности защиты ИКДСК-К5
The technical result of the development of compositions CESCI -C5, CESCi -S5 is a simultaneous double action in the studied compositions, and more precisely their high complex protective effect against the formation of calcium carbonate deposits and corrosion in oilfield equipment. During the development of the compositions, special attention was paid to the verification of their physical, chemical and technological properties. Thus, the composition has the necessary viscosity for scale and corrosion inhibitors,
and is a homogeneous fluid which is stable at formation temperature, resistant to negative temperatures, compatible with the formation and plugging solutions. Thus, it was established that the compositions CESCi - C5 and CESCi - S5 meet the general requirements of oil companies for the physical, chemical, and technological properties of liquid inhibitors.
20 30 40 50 70 100 120
concentration, mg/l
Fig. 2. Generalized results of protection efficiency of CESCI - S5 Рис. 2. Обобщенные результаты эффективности защиты ИКДСК-С5
CONCLUSION
For the first time, using MARZA-2, gossypol resin, kerosene and diesel fuel components, twelve composites with a complex action against calcium carbonate salts and corrosion were prepared, their physi-cochemical and technological properties were determined. It is established that the physicochemical and technological properties of the developed compositions fully correspond to the requirements of oil companies for such reagents.
To study composites' effectiveness against the deposition of calcium carbonate in the laboratory was developed a model of formation water wells 1802 of the NGDU "Bibiheybatneft" field. The experiments were performed at concentrations of composites 50,70,100,120 mg/l. At the same time, maximum effect against the deposition of calcium carbonate and corrosion was observed at a concentration of 100 mg/l of composites CESCi - C5, CESCi - S5. Ci for CESCi - C5 was 99%, Si was 98%, Ci for CESCi - S 5 was 100%, and Si was 99%.
To determine the initial optimal concentration in CESCi - C 5, CESCi - S 5 composites, studies were conducted for their concentrations of20, 30, 40, 50, 70, 100, 120 mg/l. Analysis of the results of experiments showed that this concentration is 40 mg/l for CESCi -C 5 and 30 mg/l for CESCi - S 5.
The authors declare the absence a conflict of interest warranting disclosure in this article.
Авторы заявляют об отсутствии конфликта интересов, требующего раскрытия в данной статье.
ИКДСК-С5
№ Concentration, mg/l Protection effect,%
1 20 89
2 30 91
3 40 93
4 50 94
5 70 97
6 100 100
7 120 89
ЛИТЕРАТУРА
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Поступила в редакцию 22.03.2022 Принята к опубликованию 05.09.2022
Received 22.03.2022 Accepted 05.09.2022
