Language of numbers in reservoir engineering, MIN & MAX

Well Test Analysis, Pressure and Production Monitoring........ etc.

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X880862531X
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Language of numbers in reservoir engineering, MIN & MAX

Post by X880862531X »

[align=justify]Dear brothers,

Focus on these words :
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[align=justify]Drainage area is the area that can be drained by one well. Depending on the permeability & the pressure within the reservoir, a well may be able to draw oil from as far as a couple of kilometers or as near as only a few hundred meters.

Source : An introduction to the petroleum industry - Alphonsus Fagan - Government of Newfoundland and Labrador - Department of mines & energy - Nov. 1991
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[align=justify]In these words, we heard about the minimum & maximum values of drainage area of a well. So, when we hear any number of drainage area, we can say if it is large or small.

In my opinion, Knowing the range of any parameter is as important as knowing its definition.

I hope that any member know the range of any reservoir engineering parameter, post it here in this topic. Also, I hope a topic similar to this is created in every section of our forum ( Drilling, production, Geology, ... ). I think this will be helpful to all of us.

Please, if you post a range of any parameter, tell us :
1- Source ( book, practical experience, lecture, ... ).
2- Date (( As you know, such numbers may vary with time because of many things such as new technology ))

I suggest some parameters such as :
- Perforation penetration depth.
- Drilling depth.
- Costs of petroleum services ( Perforation, frac, ... ).
- Number of wells on the same offshore rig.
- Water depth under an offshore rig.
- Drilling cost $/Ft.
- How much it costs to produce 1 bbl of oil ( In several countries ).
- Length of the horizontal section of a horizontal well.

I hope this topic is helpful.

Best regards,
Hosam
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Best regards,
[highlight=yellow]Hosam[/highlight]
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FANARCO
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Post by FANARCO »

I think, the main factors that affecting the drainage radius is:

Average permeability
Porosity
Fluid type (Oil or Gas)
Fluid viscosity

For each of the above combinations there is a range or drainage area
For example, the drainage raduis for sandstone reservoir with 35 API and moderate permeability will have 250 - 750 Meters radius like GOS wells
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Post by X880862531X »

FANARCO wrote:I think, the main factors that affecting the drainage radius is:

Average permeability
Porosity
Fluid type (Oil or Gas)
Fluid viscosity

For each of the above combinations there is a range or drainage area
For example, the drainage raduis for sandstone reservoir with 35 API and moderate permeability will have 250 - 750 Meters radius like GOS wells
[align=justify]Thank you brother for the information, we want to taste numbers once hearing it. :wink: [/align]
Best regards,
[highlight=yellow]Hosam[/highlight]
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3-2010 : 3-2011
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3-2011 till now
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Post by FANARCO »

Another numbers for gas reservoirs in tight formation with 5 % porosity

Drainage radius 300 - 750 meters
spower
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Post by spower »

skin effect
practically maximum -5
minimum +20
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Post by spower »

spacing between wells
for oil 800-1000ft
for gas 1500ft
for heavy oil 300ft
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Post by X880862531X »

FANARCO wrote:Another numbers for gas reservoirs in tight formation with 5 % porosity

Drainage radius 300 - 750 meters
spower wrote:spacing between wells
for oil 800-1000ft
for gas 1500ft
for heavy oil 300ft
[align=justify]Thank you brothers ..[/align]
Best regards,
[highlight=yellow]Hosam[/highlight]
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Petroleum engineering B.Sc

3-2010 : 3-2011
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3-2011 till now
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arashrabiei
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Post by arashrabiei »

the main factors that affect on drainage area are effective permeability that directly affect drainage area , and porosity , viscosity and total compressibility that affect inversely ! as we know the ratio of permeability to viscosity is called mobility , so by increasing mobility we have increase in drainage area , and as gas reservoirs have higher mobility than oil reservoirs ( because of low viscosity of gas in comparison with oil ) so we have greater drainage area for gas reservoirs than oil reservoirs !
drainage radius for ordinary oils : 750-1000 Ft
gas reservoirs :1300-1800 ft
Heavy oil : 100- 400 ft
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Post by FANARCO »

arashrabiei wrote:the main factors that affect on drainage area are effective permeability that directly affect drainage area , and porosity , viscosity and total compressibility that affect inversely ! as we know the ratio of permeability to viscosity is called mobility , so by increasing mobility we have increase in drainage area , and as gas reservoirs have higher mobility than oil reservoirs ( because of low viscosity of gas in comparison with oil ) so we have greater drainage area for gas reservoirs than oil reservoirs !
drainage radius for ordinary oils : 750-1000 Ft
gas reservoirs :1300-1800 ft
Heavy oil : 100- 400 ft
[align=center]Excellent :D :D :D :D [/align]
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Post by sayeh »

thanks guys
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