Well test interpretation

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

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muhanad1992
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Well test interpretation

Post by muhanad1992 »

Dears

i have many questions about saphire and interpret software
but i think there is no one here!!!

if anybody see this topic and can help me about these software please reply to me
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FANARCO
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Re: Well test interpretation

Post by FANARCO »

Muhanad,

You registered in our forum very recent and you say : no one here !!!
Is it true ????
Did you ask a question before and didn't receive any feedback ????

Just post whatever you want and we can discuss
muhanad1992
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Re: Well test interpretation

Post by muhanad1992 »

Thanks a lot for your reply FANARCO
I said that because i was entering every day and read subjects until i read all useful subjects in all pages and i didn't see any new subjects in this department :(
i'm new well tester engineer and i was benefited a lot from this forum but i need more :D

my first Question
how can i deal with derivative plot like that!! and what the reason for this? is it from reservoir or is it because pump unit(this is injection well) and how can i recognize if is it from reservoir response or from equipment :o
Capture.PNG


and i have simple Question about NET PAY for injection wells how can i calculate it? is it only perforations interval or something different.

i'm waiting you reply to continue asking you :D

Thanks in advance
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FANARCO
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Re: Well test interpretation

Post by FANARCO »

Muhanad,,

In injection wells when you shut in the well we call this test "fall-off test" and it showing decreasing pressure over time.
If this is an injector well and this test showing increase pressure over time it means this is injection test which you record the pressure downhole in the well while injecting water.

For Net Pay there are many opinions (unsolved so far) but for me you can take the Net pay from log and not the perforated interval
muhanad1992
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Re: Well test interpretation

Post by muhanad1992 »

thank you for your reply.
I understood what you said about injection well and i think Delta P in injection well calculated (P at delta t=0 - P reservoir) so Delta P increasing
and the pressure data record at injection period and fall-off period and i did interpretation for fall-off period
as you show below log-log , semi-log- and history plot
Fall-off.PNG
and my main point about derivative plot as you see it it's abnormal so is it reservoir response ? or there is some wrong in log Data ??
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FANARCO
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Re: Well test interpretation

Post by FANARCO »

I think there is a problem in the raw data in shut in period but dont worry, only affecting the early time (first 5 minutes) but the late time region looks okay and you get a moderate match.
muhanad1992
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Re: Well test interpretation

Post by muhanad1992 »

this situation faced me a lot specially in injection test i think that's because of pump unit.

thanks a lot for your help my friend
youcefmah
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Re: Well test interpretation

Post by youcefmah »

Very Useful, Thank you
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Re: Well test interpretation

Post by FANARCO »

youcefmah wrote:Very Useful, Thank you

Welcome to your new community Yosuf :) :) :) :)
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Re: Well test interpretation

Post by FANARCO »

Can any body help me to identify this model

This is vertical well perforated in two separate zone in sandstone formation.

The Oil API is 15 and GOR is less than 100 scf/stb
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nmtruong93
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Re: Well test interpretation

Post by nmtruong93 »

I guess it, but I am not sure due to lack of information.

Reservoir Model: Two layer with crossflow (first valley due to transition period between two layers, hill due to small aquifer or oil in lower layer support, final, it acts as a homogeneous medium.
Boundary: I need geological model to make sure.
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Re: Well test interpretation

Post by FANARCO »

nmtruong93 wrote:I guess it, but I am not sure due to lack of information.

Reservoir Model: Two layer with crossflow (first valley due to transition period between two layers, hill due to small aquifer or oil in lower layer support, final, it acts as a homogeneous medium.
Boundary: I need geological model to make sure.
Yes, the cross flow in Shut in period is highly possible.
This well located between two intersecting faults (the sealing is not proved).
I will send you the rest on PM
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