Effect of surfactants on wettability of near-wellbore regions of gas reservoirs

Autor:	C. Lee, Bhargaw Adibhatla, P. Berger, Kishore K. Mohanty
Rok vydání:	2006
Předmět:	Capillary pressure Chemistry Mineralogy Geotechnical Engineering and Engineering Geology Contact angle chemistry.chemical_compound Fuel Technology Brining Chemical engineering Drawdown (hydrology) Carbonate Wetting Relative permeability Pressure gradient
Zdroj:	Journal of Petroleum Science and Engineering. 52:227-236
ISSN:	0920-4105
DOI:	10.1016/j.petrol.2006.03.026
Popis:	The flow of gas in tight, low-pressure gas wells can be partially blocked by the water saturation build-up near the hydraulic fracture face if the drawdown pressure does not exceed the capillary pressure. To increase the productivity, the water saturation may be reduced by alteration of the near-wellbore wettability from water-wet conditions to intermediate-wet conditions. Many surfactants have been identified which change the wettability of carbonate and sandstone rocks from water-wet to intermediate-wet in water–air–rock systems. Among fluorosilanes, as the number of fluoro groups increases, rocks become less water-wet. One day of aging period and 1 wt.% concentration appear to be sufficient for altering wettability. Interaction with field brine plays a crucial role in selection of appropriate surfactants. The increase in gas relative permeability due to the change in wettability is a function of the pressure gradient.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::60f88d8287d19b7930f542613ad68eb6 https://doi.org/10.1016/j.petrol.2006.03.026 Zobrazit plný text záznamu Full Text from ScienceDirect