Journal de géologie et géophysique
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Abstrait

A Study of Compositions Relevant to Selective Water Isolation in Gas Wells

Sadad Hameed AL-Obaidi, Miel Hofmann*, Victoria Smirnov, Falah Hussain Khalaf, Hiba Hussain Alwan

A hydrophobic composition containing water repellents and highly volatile solvents is shown in this study to isolate water from the bottom hole formation zone of gas wells and reduce as much as possible the saturation of pore spaces with water. During injection, this composition shows selectivity and mostly penetrates water-saturated porous media. The study shows that the injection of such composition into porous media has a high water-insulating effect, reducing the water permeability of water-saturated porous media by 35 times with a degree of water isolation of 97%. Moreover, while injecting, it has selective action, mainly penetrating water-saturated media rather than gas-saturated media. As a result of injecting 0.91 to 0.99 pore volumes (pv) of the composition, the Q_water/Q_gas ratio reaches 5.22 to 5.26, indicating high selectivity.