Texture, composition and properties of plugs formed by carbon dioxide hydrate and wax

  • Sergey SKIBA ,
  • Aleksey SAGIDULLIN ,
  • Alexandra SHAPOVALOVA ,
  • Larisa STRELETS ,
  • Andrey MANAKOV
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  • 1. Nikolaev Institute of Inorganic Chemistry, SB RAS, Ac. Lavrentiev Ave. 3, Novosibirsk 630090, Russia
    2. Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Russia
    3. Institute of Petroleum Chemistry SB RAS, Akademichesky ave., 4, Tomsk 634021, Russia

Received date: 2021-12-01

  Revised date: 2021-10-01

  Online published: 2021-12-29

Abstract

Gas hydrates and wax are the major flow assurance problems for the transportation of produced hydrocarbons through pipelines. However, in most research works both these two problems are studied separately. Although simultaneous precipitation or deposition of these compounds in pipelines can lead to different mitigation/prevention strategies, the investigations in which both these problems are considered simultaneously appeared only recently. There is no information in the literature on the texture/composition and features of decomposition process of mixed wax/hydrate plugs. At the same time, this information could be useful to understand how to treat the problem of formation of these plugs. In this work, three wax/gas hydrate plugs were collected at quasi-static conditions from a water-in-oil emulsion to study their texture, composition and the features of decomposition process. Powder X-ray diffraction and IR (infrared spectroscopy) analyses showed that the plugs consisted of wax and gas hydrate. Thermovolumetric and DSC (Differential Scanning Calorimetry) experiments showed that the main part of gas hydrate in the plugs at the ambient pressure started to decompose at about 268 K. This temperature was higher than the equilibrium temperature of carbon dioxide hydrate at this pressure, indicating that the gas hydrate in the plugs could be effectively preserved at temperatures below the ice melting point (273.2 K). It was found through observation of the hydrate decomposition process in the plugs under the microscope that the gas in the samples released in small bubbles, while the hydrate particles were not visible at this magnification, indicating that the hydrate was indeed highly dispersed in the samples. A residual wax was jelly-like after decomposition of hydrate in all the cases. Rheological experiments showed that the plugs residues after decomposition of the hydrates had higher yield points and viscosities than the initial waxy crude oil originally used for the experiments.

Cite this article

Sergey SKIBA , Aleksey SAGIDULLIN , Alexandra SHAPOVALOVA , Larisa STRELETS , Andrey MANAKOV . Texture, composition and properties of plugs formed by carbon dioxide hydrate and wax[J]. Petroleum Exploration and Development, 2021 , 48(6) : 1462 -1470 . DOI: 10.1016/S1876-3804(21)60302-6

References

[1] SLOAN E D, KOH C A, SUM A K. Natural gas hydrates in flow assurance. Oxford, U.K.: Elsevier Inc., 2010.
[2] GAO Shuqiang. Investigation of interactions between gas hydrates and several other flow assurance elements. Energy and Fuels, 2008, 22(5): 3150-3153.
[3] MAHABADIAN M A, CHAPOY A, BURGASS R, et al. Mutual effects of paraffin waxes and clathrate hydrates: A multiphase integrated thermodynamic model and experimental measurements. Fluid Phase Equilibria, 2016, 427: 438-459.
[4] KONTOGEORGIS G M, VOUTSAS E C, YAKOUMIS I V, et al. An equation of state for associating fluids. Industrial & Engineering Chemistry Research, 1996, 35(11): 4310-4318.
[5] van der WAALS J H, PLATTEEUW J C. Clathrate solutions. New Jersey, U.S.: Wiley Online Library, 2007.
[6] WANG W, HUANG Q, HU S, et al. Influence of wax on cyclopentane clathrate hydrate cohesive forces and interfacial properties. Energy and Fuels, 2020, 34(2): 1482-1491.
[7] BROWN E P, TURNER D, GRASSO G, et al. Effect of wax/anti-agglomerant interactions on hydrate depositing systems. Fuel, 2020, 264: 116573.
[8] WANG W, HUANG Q, ZHENG H, et al. Effect of wax on hydrate formation in water-in-oil emulsions. Journal of Dispersion Science and Technology, 2020, 41(12): 1821-1830.
[9] SHI B H, CHAI S, DING L, et al. An investigation on gas hydrate formation and slurry viscosity in the presence of wax crystals. AIChE Journal, 2018, 64(9): 3502-3518.
[10] ZHENG H, HUANG Q, WANG W, et al. Induction time of hydrate formation in water-in-oil emulsions. Industrial & Engineering Chemistry Research, 2017, 56(29): 8330-8339.
[11] CHEN Y, SHI B, LIU Y, et al. Experimental and theoretical investigation of the interaction between hydrate formation and wax precipitation in water-in-oil emulsions. Energy & Fuels, 2018, 32(9): 9081-9092.
[12] LIU Y, SHI B, DING L, et al. Study of hydrate formation in water-in-waxy oil emulsions considering heat transfer and mass transfer. Fuel, 2019, 244: 282-295.
[13] RAMAN A K Y, AICHELE C P. Effect of particle hydrophobicity on hydrate formation in water-in-oil emulsions in the presence of wax. Energy & Fuels, 2017, 31(5): 4817-4825.
[14] LIU Y, SHI B, DING L, et al. Investigation of hydrate agglomeration and plugging mechanism in low-wax-content water-in-oil emulsion systems. Energy & Fuels, 2018, 32(9): 8986-9000.
[15] STRAUME E O, MORALES R E M, SUM A K. Perspectives on gas hydrates cold flow technology. Energy & Fuels, 2018, 33(1): 1-15.
[16] LIU Z, LI Y, WANG W, et al. Wax and wax-hydrate deposition characteristics in single-, two-, and three-phase pipelines: A review. Energy & Fuels, 2020, 34(11): 13350-13368.
[17] WANG Y, SUBRAMANIAN S, ESTANGA D, et al. Changing the hydrate management guidelines: From benchtop experiments to CSMHyK field simulations. Energy & Fuels, 2020, 34(11): 13523-13535.
[18] AMAN Z M, KOH C A. Interfacial phenomena in gas hydrate systems. Chemical Society Reviews, 2016, 45: 1678-1690.
[19] ZHANG J, WANG Z, DUAN W, et al. Real-time estimation and management of hydrate plugging risk during deepwater gas well testing. SPE Journal, 2020, 25(6): 3250-3264.
[20] ZHANG Jianbo, WANG Zhiyuan, LIU Shujie, et al. A method for preventing hydrates from blocking flow during deep-water gas well testing. Petroleum Exploration and Development, 2020, 47(6): 1256-1264.
[21] WANG Z, TONG S, WANG C, et al. Hydrate deposition prediction model for deep-water gas wells under shut-in conditions. Fuel, 2020, 275: 117944.
[22] ZHANG J, WANG Z, LIU S, et al. Prediction of hydrate deposition in pipelines to improve gas transportation efficiency and safety. Applied Energy, 2019, 253: 113521.
[23] WANG Z, ZHANG J, SUN B, et al. A new hydrate deposition prediction model for gas-dominated systems with free water. Chemical Engineering Science, 2017, 163: 145-154.
[24] de OLIVEIRA M C K, TEXEIRA A, VIEIRA L C, et al. Flow assurance study for waxy crude oils. Energy & Fuels, 2012, 26(5): 2688-2695.
[25] SJÖBLOM J, ØVREVOLL B, JENTOFT G, et al. Investigation of properties of the hydrate plugging and non-plugging oils. Journal of Dispersion Science and Technology, 2010, 31(8): 1100-1119.
[26] ToupTek Company. ToupView (Windows)/Dshow/Twain driver for microscope camera. (2010-11-01)[2020-12-01].http://touptek.com/download/showdownload.php?lang=en&id=33.
[27] STOPOREV A S, OGIENKO A G, ALTUNINA L K, et al. Co-deposition of gas hydrate and oil wax from water-in- crude oil emulsion saturated with CO2. IOP Conference Series: Earth and Environmental Science, 2018, 193(1): 012042.
[28] OGIENKO A G, KURNOSOV A V, MANAKOV A Y, et al. Gas hydrate of argon and methane synthesized at high pressure: Composition, thermal expansion and self-preservation. The Journal of Physical Chemistry B, 2006, 110(6): 2840-2846
[29] CIRCONE S, STERN L A, KIRBY S H, et al. CO2 hydrate: Synthesis, composition, structure, dissociation behavior, and a comparison to structure I CH4 hydrate. Journal of Physical Chemistry B, 2003, 107(23): 5529-5539.
[30] ROTTGER K, ENDRISS A, IHRINGER J, et al. Lattice constants and thermal expansion of H2O and D2O ice Ih between 10 and 265 K. Acta Crystallographica Section B, 1994, 50(6): 644-648.
[31] UDACHIN K A, RATCLIFFE C I, RIPMEESTER J A. Structure, composition, and thermal expansion of CO2 hydrate from single crystal X-ray diffraction measurements. Journal of Physical Chemistry B, 2001, 105(19): 4200-4204.
[32] NEGORO K. X-Ray diffraction and electron microscope observation performed on various types of paraffins. Journal of the Japan Petroleum Institute, 1962, 5(1): 23-26.
[33] HEYDING R D, RUSSELL K E, VARTY T L, et al. The normal paraffins revisited. Powder Diffraction, 1990, 5(2): 93-100.
[34] TURNER D J, MILLER K T, SLOAN E D. Direct conversion of water droplets to methane hydrate in crude oil. Chemical Engineering Science, 2009, 64(23): 5066-5072.
[35] TARASEVICH B N. IR spectra of basic classes of organic compounds. Moscow, Russia: Moskow State University, 2012.
[36] STOPOREV A S, MANAKOV A Y, ALTUNINA L K, et al. Unusual self-preservation of methane hydrate in oil suspensions. Energy & Fuels, 2014, 28(2): 794-802.
[37] STOPOREV A S, CHESHKOVA T V, SEMENOV A P, et al. Influence of petroleum fractions on the process of methane hydrate self-preservation. Mendeleev Communications, 2018, 28(5): 533-535.
[38] GABITTO J F, TSOURIS C. Physical properties of gas hydrates: A review. Journal of Thermodynamics, 2010, 2010: 271291.
[39] STOPOREV A S, MANAKOV A Y, ALTUNINA L K, et al. Self-preservation of gas hydrate particles suspended in crude oils and liquid hydrocarbons: Role of preparation method, dispersion media, and hydrate former. Energy & Fuels, 2016, 30(11): 9014-9021.
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