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Help on No of wells

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

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Help on No of wells

Postby petro » Wed Mar 18, 2015 7:57 pm

hello all,

is there any well-illustrated document or someone can explain how to deterine the required no of wells to deplete a reservoir.

thanks!
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Re: Help on No of wells

Postby FANARCO » Wed Mar 18, 2015 8:22 pm

From analogue (nearby fields) producing from the same reservoir you have an idea of well spacing.

From well spacing you know the average drainage radius per well and then you can calculate the drainage area / well

In your respective field you have the area in Acre

Divide the whole area on the area/well will come up with the number of wells
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Re: Help on No of wells

Postby petro » Wed Mar 18, 2015 8:49 pm

Thank you Fanarco,

I think it is not only the drainge area, properties like permeability may play a role in determine number of wells. Low k reservoir, not the same as high K reservoir.

thanks!
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Re: Help on No of wells

Postby FANARCO » Wed Mar 18, 2015 9:04 pm

petro wrote:Thank you Fanarco,

I think it is not only the drainge area, properties like permeability may play a role in determine number of wells. Low k reservoir, not the same as high K reservoir.

thanks!


The method i mentioned above if case you don't have any data for your field/prospect or you are in exploration phase. And conditioned to have the same expected properties.

If you have a well and reservoir data there is another method by Darcy equation in radial flow and estimate Re.

A third way if you know any idea about average EUR/well.....

Actually, to choose which way depends on the available data.

Let me share with you some material related to this topic tomorrow.
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Re: Help on No of wells

Postby petro » Wed Mar 18, 2015 9:08 pm

FANARCO wrote:
petro wrote:Thank you Fanarco,

I think it is not only the drainge area, properties like permeability may play a role in determine number of wells. Low k reservoir, not the same as high K reservoir.

thanks!


The method i mentioned above if case you don't have any data for your field/prospect or you are in exploration phase. And conditioned to have the same expected properties.

If you have a well and reservoir data there is another method by Darcy equation in radial flow and estimate Re.

A third way if you know any idea about average EUR/well.....

Actually, to choose which way depends on the available data.

Let me share with you some material related to this topic tomorrow.





thank you for quick reply,

will wait for the material to read.
petro
 
Posts: 34
Joined: Sat Jan 15, 2011 12:02 am

Re: Help on No of wells

Postby FANARCO » Thu Mar 19, 2015 11:05 am

The below table provide you with the Primary Recovery in Stock Tank Barrels per Acre-foot per Percent Porosity for Depletion type Reservoirs.

For example if you have a well proposed to drain a sandstone reservoir with 15 % porosity and expected GOR 600 SCF/STB and 30 API, so from the table the expected range is 3.61 to 10.48

So, the expected EUR per well = 3.61 x 15 (porosity) x 100 (area in acre) x 30 (thickness in ft) = 162,450 STB (0.162 MM STB) ...... Minimum value

And vise verse for maximum and average

Now you know the EUR per well..

For the field you know the OIIP and Recovery Factor and hence the total EUR per field.

Divide the field EUR on EUR per well, this will come up with Number of well


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Re: Help on No of wells

Postby petro » Thu Mar 19, 2015 8:18 pm

FANARCO wrote:The below table provide you with the Primary Recovery in Stock Tank Barrels per Acre-foot per Percent Porosity for Depletion type Reservoirs.

For example if you have a well proposed to drain a sandstone reservoir with 15 % porosity and expected GOR 600 SCF/STB and 30 API, so from the table the expected range is 3.61 to 10.48

So, the expected EUR per well = 3.61 x 15 (porosity) x 100 (area in acre) x 30 (thickness in ft) = 162,450 STB (0.162 MM STB) ...... Minimum value

And vise verse for maximum and average

Now you know the EUR per well..

For the field you know the OIIP and Recovery Factor and hence the total EUR per field.

Divide the field EUR on EUR per well, this will come up with Number of well


Image



This is a good material,

Thank you for your time and help!

Regards!
petro
 
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