scholarly journals Performance of waterborne polyurethane based on N-tert-butyldiethanolamine in corrosion inhibition

2021 ◽  
Vol 1201 (1) ◽  
pp. 012074
Author(s):  
Y Zaripova ◽  
M Varfolomeev ◽  
R Pavelyev ◽  
A Farhadian ◽  
V Yarkovoi ◽  
...  
Keyword(s):  
Corrosion Inhibition ◽  
Room Temperature ◽  
Oil And Gas ◽  
Reference Sample ◽  
Hydrate Formation ◽  
Oil And Gas Industry ◽  
Waterborne Polyurethane ◽  
Gas Industry ◽  
Waterborne Polyurethanes ◽  
Inhibition Ability

Abstract The design of bifunctional inhibitors effectively preventing hydrate formation and corrosion is a relevant issue for the oil and gas industry. In this work, we expanded the study of the corrosion inhibition effectiveness for waterborne polyurethanes (WPUs) obtained earlier and shown to be promising inhibitors. The corrosion inhibition ability of WPUs was assessed using weight-loss and electrochemical methods. Commercial corrosion inhibitor Armohib CI-28 was taken as a reference sample. The data obtained showed that the tert-Bu-WPU sample is able to effectively inhibit acid and carbon dioxide corrosion at room temperature; however, with an increase in temperature, its efficiency decreases more intensively than for a commercial inhibitor. In general, waterborne polyurethanes are promising alternatives to commercial reagents due to their multifunctionality.

scholarly journals Performance of Waterborne Polyurethanes in Inhibition of Gas Hydrate Formation and Corrosion: Influence of Hydrophobic Fragments

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5664
Author(s):  
Roman S. Pavelyev ◽  
Yulia F. Zaripova ◽  
Vladimir V. Yarkovoi ◽  
Svetlana S. Vinogradova ◽  
Sherzod Razhabov ◽  
...  
Keyword(s):  
Corrosion Inhibitor ◽  
Oil And Gas ◽  
Hydrate Formation ◽  
Oxygen Demand ◽  
Oil And Gas Industry ◽  
Dual Function ◽  
Structure Property ◽  
Tert Butyl ◽  
Waterborne Polyurethanes ◽  
Gas Hydrate Formation

The design of new dual-function inhibitors simultaneously preventing hydrate formation and corrosion is a relevant issue for the oil and gas industry. The structure-property relationship for a promising class of hybrid inhibitors based on waterborne polyurethanes (WPU) was studied in this work. Variation of diethanolamines differing in the size and branching of N-substituents (methyl, n-butyl, and tert-butyl), as well as the amount of these groups, allowed the structure of polymer molecules to be preset during their synthesis. To assess the hydrate and corrosion inhibition efficiency of developed reagents pressurized rocking cells, electrochemistry and weight-loss techniques were used. A distinct effect of these variables altering the hydrophobicity of obtained compounds on their target properties was revealed. Polymers with increased content of diethanolamine fragments with n- or tert-butyl as N-substituent (WPU-6 and WPU-7, respectively) worked as dual-function inhibitors, showing nearly the same efficiency as commercial ones at low concentration (0.25 wt%), with the branched one (tert-butyl; WPU-7) turning out to be more effective as a corrosion inhibitor. Commercial kinetic hydrate inhibitor Luvicap 55 W and corrosion inhibitor Armohib CI-28 were taken as reference samples. Preliminary study reveals that WPU-6 and WPU-7 polyurethanes as well as Luvicap 55 W are all poorly biodegradable compounds; BODt/CODcr (ratio of Biochemical oxygen demand and Chemical oxygen demand) value is 0.234 and 0.294 for WPU-6 and WPU-7, respectively, compared to 0.251 for commercial kinetic hydrate inhibitor Luvicap 55 W. Since the obtained polyurethanes have a bifunctional effect and operate at low enough concentrations, their employment is expected to reduce both operating costs and environmental impact.

Development and Application of a New Style Low Dosage Hydrate Inhibitors

2014 ◽  
Author(s):  
Weixin Pang ◽  
Qingping Li ◽  
Fujie Sun
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
South China Sea ◽  
Field Test ◽  
Oil And Gas ◽  
Hydrate Formation ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Effective Technology ◽  
Low Dosage

The hydrate is an important issue that the flow assurance has to face in the oil and gas industry, especially in the deepwater area. With high pressure and low temperature, the hydrate formation is easily happened and leads to plug in the pipeline. In addition to the traditional thermodynamic inhibitor, the low dosage hydrate inhibitors (LDHI) has been increasing used as a costly effective technology for gas hydrate control. The LDHI include kinetic hydrate inhibitor (KHI) and anti-agglomerant (AA), the former can inhibit the hydrate formation in the pipeline, and the latter can prevent the agglomeration and plug of hydrate particles. According to the properties of oil and gas of South China Sea, a new KHI and AA were developed, a field test of the KHI has been undertaken and the results indicate that it can prevent the hydrate formation and plug in the pipeline well, the lab evaluation of the developed AA is in progress and the field test will be performed by the next year.

Corrosion Inhibition in Oil and Gas Industry

2020 ◽  
pp. 135-150
Author(s):  
Anupama R. Prasad ◽  
Anupama Kunyankandy ◽  
Abraham Joseph
Keyword(s):  
Corrosion Inhibition ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry

New «green» inhibitors of gas hydrate formation for the oil and gas industry based on polysaccharides

2021 ◽  
pp. 33-40
Author(s):  
V.A. Dokichev ◽  
◽  
A.I. Voloshin ◽  
N.E. Nifantiev ◽  
M.P. Egorov ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Oil And Gas ◽  
Hydrate Formation ◽  
Field Tests ◽  
Oil And Gas Industry ◽  
Quasi Equilibrium ◽  
Green Inhibitor ◽  
Gas Industry ◽  
Gas Hydrate Formation ◽  
Thermobaric Conditions

The thermobaric conditions for the formation of gas hydrates in the presence of the sodium salt of carboxymethylcellulose, dextran, and arabinogalactan were studied in a quasi-equilibrium thermodynamic experiment. It is established that polysaccharides slow down the rate and change the conditions of gas hydrate formation of a mixture of natural gases, showing the properties of a thermodynamic and kinetic inhibitor with technological efficiency exceeding methanol by 170-270 times when used in the same dosages. The results of the development of a «green» synergistic inhibitor of gas hydrate formation «Glycan RU» on their basis are presented, which includes a combination of thermodynamic and kinetic inhibitors. Pilot field tests of «Glycan RU» were carried out at the wells of the Priobskoye, Prirazlomnoye, Ombinsky, Zapadno-Ugutskoye oilfields. It was found that at dosages of 1000 g/m3 and 500 g/m3, there is no formation of hydrate plugs in the annulus. «Glycan RU» is recommended for industrial use by the technology of periodic injection and/or continuous dosing through wellhead dispensers. Keywords: carboxymethylcellulose; dextran; arabinogalactan; polysaccharides; «green» inhibitor of gas hydrate formation; «Glycan RU».

scholarly journals PROPOSED CO2 HYDRATE TECHNOLOGY APPLICATION FOR CARBON CAPTURE AND STORAGE IMPLEMENTATION IN INDONESIA

2018 ◽  
Vol 40 (2) ◽  
pp. 69-74
Author(s):  
Yusep Kartiwa Caryana
Keyword(s):  
Gas Hydrate ◽  
Carbon Capture ◽  
Oil And Gas ◽  
Sodium Dodecyl ◽  
Hydrate Formation ◽  
Oil And Gas Industry ◽  
Formation Pressure ◽  
Gas Industry ◽  
Equilibrium Pressure ◽  
Technology Application

Carbon Capture and Sequestration (0r Storage)known as CCS needs to be implemented in various development activities in Indonesia including downstream oil and gas industry because the government of Indonesia has adopted the Paris Agreement on Greenhouse Gas Emissions Reduction. Various capture techniques have been developed for capturing CO2 from post combustion emission. One of the new approaches considered for capturing CO2 and hence reducing to atmospheric emissions is based on gas hydrate (crystallization) technology. The basis of the technology is the selective partition of the target component between the hydrate phase and the gaseous phase. It is expected that CO2 is preferentially trapped and encaged into the hydrate crystal phase compared to the other components. Previous study found that the gas/hydrate equilibrium pressure and temperature for the fl ue gas mixture in the range of 7.6 MPa and 11.0 MPa at 274 K and 277 K respectively, are inappropriate to the downstream oil and gas industrial reality because the operating cost will be expensive to compress the gas to the hydrate formation pressure. Suitable hydrate promoters including Tetrahydrofuran (THF) and Sodium Dodecyl Sulfate (SDS) can be used to achieve moderate hydrate formation pressure and energy consumption appropriate to the industrial reality. In the presence of THF and SDS about 62.3 Nm3/m3 CO2 hydrate can be formed at 30 bar pressure and 274 to 277 K temperature within around 15 minutes reaction time.Many experiments result indicates that continuous hydrates formation will be feasible for scale-up to industrial settings including downstream oil and gas industry emission reduction if the technology assures an optimal contact between gas and liquid phases plus the proper hydrate promoter. However, compared to current international carbon credit, the feasibility of onshore CO2 abatement cost in downstream oil and gas industry sensitively depends on the distance of CO2 hydrate pipeline transportation.

Modelling the Formation of Gas Hydrate in the Pipelines

2021 ◽  
Vol 5 (1) ◽  
pp. 1-14
Author(s):  
Saeed Z
Keyword(s):  
Oil And Gas ◽  
Hydrate Formation ◽  
Real Data ◽  
Oil And Gas Industry ◽  
Formation Condition ◽  
Aqueous Environment ◽  
Gas Industry ◽  
Comprehensive Information ◽  
Storage Reservoirs ◽  
Petroleum Wells

Water and hydrocarbon are generally found beside each other in nature i.e., hydrocarbons are formed in aqueous environment. Natural gas and crude oil of storage reservoirs and transferring pipes from petroleum wells to industrial processes of oil and gas are in contact with water and they are in equilibrium with each other. Generally, water is considered as an intruder in oil and gas industry from primary production to ultimate consumption. It causes corrosion in pipelines and reduces the heating value of the fuel. High pressure and low temperature could also cause water condensation and liquid water considerably reduces pipelines efficiency. Low temperatures in winter or an adiabatic pressure drop could ultimately lead to hydrate formation in pipelines. Therefore, hydrate formation causes various problems and costs. In order to prevent hydrate formation, there should be comprehensive information about hydrate formation conditions. The available data on hydrate are outdated and might not have enough accuracy. The data are also specified for a single gas component while mixtures of gases are generally observed in pipelines. The current work tries to increase modeling accuracy of hydrate formation condition in pipelines with different compositions. In this research, a program was coded in MATLAB which specifies hydrate formation condition. In this program, the most accurate equations were used to predict the most efficient condition. Results of the program were compared with real data as well as results of PVTsim simulator. The comparisons indicated that this program could predict hydrate formation condition more accurately.

A Coupled Hydrate and Compositional Wellbore Simulator: Understanding Hydrate Inhibition from Associated Brines in Oil and Gas Production

2021 ◽  
pp. 1-15
Author(s):  
Fernando M. C. Coelho ◽  
Kamy Sepehrnoori ◽  
Ofodike A. Ezekoye
Keyword(s):  
Oil And Gas ◽  
Production Systems ◽  
Hydrate Formation ◽  
Oil And Gas Industry ◽  
Gas Production ◽  
Gas Industry ◽  
Oil And Gas Production ◽  
Gas Molecules ◽  
Flow Simulator ◽  
Do So

Summary Hydrates are ice-like solids composed of a water-based lattice “encaging” gas molecules. They form under conditions of high pressure and low temperature. In the oil and gas industry, where these conditions are easily met, hydrate formation may cause pipe blockages and severe financial implications, making its prevention (and remediation) one of the main flow-assurance concerns. Desired hydrate inhibition may come from electrolytes naturally dissolved in the water that is produced in conjunction with the hydrocarbon stream, or alcohols can be deliberately injected for such a purpose. When trying to predict hydrate conditions in real-world production systems, computer simulation should ideally integrate hydrate and multiphase-flow calculations. Failing to do so [by performing a decoupled analysis with a flow simulator and a separate pressure/volume/temperature (PVT) package for example] may generate misleading results under certain flow conditions. This paper presents an integrated wellbore simulator to deal with this issue. A hydrate model is added to verify hydrate formation for specific pressure, temperature, and composition of each gridblock. Integration with a geochemical package allows consideration of electrolyte inhibition coming from the associated brine. After successfully comparing results with the available simulators and the experimental data, it is demonstrated that when flowing gas/water ratios (GWRs) exceed 105 scf/STB, water condensation throughout the flow may dilute the beneficial effect arising from the brine composition, thus reducing electrolyte inhibition. Conversely, mineral precipitation along the flow path has shown a nearly negligible impact on this effect.

Sign in / Sign up

Export Citation Format

Share Document