Capillary Pressure Tutorial: Part 3 - The Jungle Gives Us Many Things
- David Patrick Murphy
- Document ID
- Society of Petrophysicists and Well-Log Analysts
- Publication Date
- December 2018
- Document Type
- Journal Paper
- 739 - 747
- 2018. Society of Petrophysicists & Well Log Analysts
- 11 in the last 30 days
- 124 since 2007
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Editor’s Comment: If you have read the Parts 1 and 2 on Capillary Pressure you recall that these tutorials are designed for new petrophysicists with fewer than three years of experience. If you have not read the ﬁrst two tutorials, we strongly encourage you to do so before undertaking the perusal and scrutiny of this tutorial. We shall expect the reader to know the information discussed in the ﬁrst two tutorials, as these concepts are needed to discuss the applications and analysis presented in this third and last Capillary Pressure tutorial.
Although those reading this tutorial would do so to apply capillary pressure analysis to porous rock containing hydrocarbons and water, one can also apply these analyses to porous media containing other ﬂuids simply by changing the parameters. A few examples of such applications include carbon dioxide reservoirs (CO2 and water) like McElmo Dome in Colorado, helium/nitrogen reservoirs (He/N2 and water) like Pinta Dome in Arizona, agricultural ﬁeld soil (air and water) on farms all over the world, and cement-based materials, such as mortars and concretes (air and water), also everywhere.
At the end of the last tutorial, we cautioned the reader to hold on tight. This may have been a bit of an understatement. The capillary pressure jungle is a scary and treacherous place for the novice, but we must leave the safety of the Capillary Pressure Express train from time to time to learn the secrets of the jungle. This author sees so many formation evaluation specialists being satisﬁed with only using a pore volume plot of capillary pressure data for saturation or general rock quality because they have not taken the time to see what else the jungle has to oﬀer.
However once you learn your way around the jungle, capillary pressure analyses will give you many useful things that are manifestly needed for reservoir characterization. Those useful things include porosity, pore-throat-size distribution, permeability, saturation-height function, irreducible water saturation, residual hydrocarbon saturation, wettability, seal capacity, rock typing, and water levels.
The ﬁrst stop on the train route is the station for drainage capillary pressure curves.
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