Experimental investigation of carbon dioxide injection effects on methane-propane-carbon dioxide mixture hydrates

Abbasov, Abbas
Merey, Sukru
Parlaktuna, Mahmut
In this research, first, hydrate with high saturation in porous media (sand sediments) was formed in fully filled high pressure cell by using a mixture of the following gases at 4 degrees C: methane (CH4), propane (C3H8) and carbon dioxide (CO2). The feed mole percent of the gases used was selected as follows: CH4 (95%), C3H8 (3%), CO2 (2%). This selection was made in order to form natural gas hydrate of thermogenic origin (sII type hydrate). Thereafter, CO2 injection into the high saturation hydrate media was performed in order to elucidate possible CH4 recovery. However, it was observed that injected CO2 was not able to flow through sediments, because of the impermeable barrier created by hydrate, and because of the fact that no free space was left in the cell as it was completely filled with porous media resulting in mass transfer limitations. Therefore, it was proposed that methane recovery occurred only near the hydrate interface. Taking into consideration obtained results, in the next step we decreased the volume of the sand, to create a space for the free gas evolution above the high saturation hydrate, and further completely replaced free gas composition by CO2. We observed that this time not only CH4, but C3H8 was recovered from hydrate phase implying further reconsideration of the injection of CO2 into sII hydrate. The results of this study imply that it is possible to recover hydrocarbon gases from hydrates more stable than CO2 hydrate by creating a CO2 rich environment.


Experimental research on in-tube condensation under steady-state and transient conditions
Tanrikut, A; Yesin, O (2005-01-01)
In this research study, in-tube condensation in the presence of air was investigated experimentally at a heat exchanger of countercurrent type for different operating conditions. The test matrix for the steady-state condition covers the range of pressures P = 1.8 to 5.5 bars, vapor Reynolds numbers Re, = 45 000 to 94 000, and inlet air mass fraction values Xi = 0 to 52%. The effect of air manifests itself by a reduction in the local heat flux and the local heat transfer coefficient. The local heat transfer ...
Hydrate Formation Conditions of Methane Hydrogen Sulfide Mixtures
Bulbul, S.; Parlaktuna, Mahmut; Mehmetoglu, T.; Karabakal, U. (2014-01-01)
The objective of the study is to determine hydrate formation conditions of methane-hydrogen sulfide mixtures. An experimental work is carried out with different H2S concentrations and both brine and distilled water. The Black Sea conditions, which are suitable for methane-hydrogen sulfide hydrate formation, are examined. Effects of H2S concentration and salinity on the hydrate formation conditions are also obtained during the study. It is concluded that an increase in the salinity shifts the methane-hydroge...
Sun, Z. P.; Evis, Zafer (2009-01-23)
Pure and Mg(2+) & F(-) doped nano hydroxyapatites (HA) were synthesized by a precipitation method and sintered at 1100 degrees C to investigate their densification and structure. Different amounts of Mg(2+) and F ions were doped in to HAs. X-ray diffraction was used to identify the presence of phases And lattice parameters of HA and tri-calcium phosphates (TCP) present in the samples. Densification of HA was improved by the addition of these ions. In most of the doped samples, beta-tri-calcium phosphate (TC...
Investigation of gas hydrate potential of the Black Sea and modelling of gas production from a hypothetical Class 1 methane hydrate reservoir in the Black Sea conditions
Merey, Sukru; Sınayuç, Çağlar (2016-02-01)
Gas hydrate deposits which are found in deep ocean sediments and in permafrost regions are supposed to be a fossil fuel reserve for the future. The Black Sea is also considered rich in terms of gas hydrates. It abundantly contains gas hydrates as methane (CH4 similar to 80-99.9%) source. In this study, by using the literature seismic and other data of the Black Sea such as salinity, porosity of the sediments, common gas type, temperature distribution and pressure gradient, it was estimated that up to 71.8 (...
Adsorption behaviour of shale gas reservoirs
Merey, Sukru; Sınayuç, Çağlar (2018-01-01)
Experimental adsorption measurements for one shale sample were conducted at 25 degrees C, 50 degrees C and 75 degrees C up to 2,000 psia by using pure methane (CH4) and pure carbon dioxide (CO2) to understand the behaviour of CH4 and CO2 adsorption on shales. The effects of temperature and pressure on CH4 and CO2 adsorption on the shale sample were observed. When temperature decreases from 75 degrees C to 25 degrees C, the adsorption capacity increases for both CH4 and CO2 adsorption. As pressure increases,...
Citation Formats
A. Abbasov, S. Merey, and M. Parlaktuna, “Experimental investigation of carbon dioxide injection effects on methane-propane-carbon dioxide mixture hydrates,” JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING, pp. 1148–1158, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/39541.