Is there a way to specify the component being produced from a source well?
My producing well is producing fluid through the ESP and venting gas through the casing annulus. Both flows are controlled independently. I am trying to history match the test and would like to produce from the same node i) a mixed fluid or mostly fluid flow (to represent the ESP flow) and ii) a pure gas flow (to represent the casing venting). I am running EWASG with CH4.
Any thoughts on how to do this in T3?
Thank you.
Yannick
6 replies
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Have you tried "MASS" or "DELV" for the production. Through the output control "OUTPU" keyword, you are able to output production rate for any phases and any components. You can specify multiple wells (source/sinks) at single mesh element.
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Yannik,
Kenny's reply assumes you want to just know (i.e., print out) the amount of a component that is produced - Kenny's answer for that is correct. However, in case you want to selectively produce a specific component (rather than a multi-component phase mixture, which is what MASS and DELV do), the answer is different. My first question is that such a sink is difficult to imagine, if it represents a standard pumping well. However, it is reasonable if you want to mimic the consumption of a specific component by geochemical reactions. If the latter is your use case, producing a specific component has been implemented in iTOUGH2 (for that very reason). However, I don't know whether this feature was transferred into TOUGH3 (to which I have no access).
Of course I recommend that you simply set up a 1-element, 1-time-step test case with a two-component fluid (water and dissolved air) in it. Run one time step (e.g., 1 second) with COM2 (air) and a negative production rate (set such that 50% of the initial amount of dissolved air is produced in a second), and see what the air mass fraction in the liquid will be (it should be 50% of the initially specified amount if component-specific production works, and almost unchanged if it does not work). At least you then know what TOUGH3 does - it may not be what you want or need, but at least you answered your own question!
Stefan
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Thanks for your replies.
My well is a geothermal well in an old gas field. So we do have two separate streams: gas+water mixture through the ESP/tubing and gas through the casing vent.
I know what T3 does by default. The sink element produces a mixture of water and gas, and I can get the fractional flow of each component in the printout, but I cannot control it through my input. I want to input specific mass rate for each component being pumped out of the model.
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Yannick,
In TOUGH2 terminology, "gas+water" is inconsistent, as gas is a phase and water is a component. Is your gas phase steam=water vapor, or, for example, CO2 or CH4? I'm not sure whether you really want to separate COMPONENT streams or PHASE streams. My previous reply addresses component streams; phase streams are determined by the relative mobility of the producing element, so you could change it by changing relative permeability parameters. However, relative permeability itself is not a simple input parameter; it depends on the system state (P, T, S) and therefore time.
Stefan
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Yes, sorry for the confusion.
The pump in my well produces CH4 and water and CH4 vents through the casing annulus of my well. The two flows are controlled independently. The water flow in the test was measured accurately. The total CH4 produced (combined from the pump and the annulus) was also estimated. I am trying to use these as inputs, plus the measured bottomhole pressures, to history match my well test and derive the gas saturations in the aquifer (assuming some relative perm / capillary functions). The end goal is to crank out some long term production forecasts water and CH4 from my system.