Well-Test Analysis in Multilateral Wells

[Damir]

Hello everyone

I’m hopping to get some help and some expert advice on such challenging subject as Well Test Analysis for multilateral wells is.
I must do well test analysis for gas-condensate well with two lateral channels ( both of them are horizontal but they are drilled trough different layers ), it is troublesome work, but it must be done.
Any literature ( if any exists on Well-Test Analysis in Multilateral Wells subject ) is more than welcome, and I will gladly return help in any way I can.

Only paper on this subject that I have found on

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Title: Well-Test Analysis in Low-Permeability Multilateral Wells
Author: A.C. Gringarten, Imperial C.; R. Sharma, Occidental Petroleum Qatar Ltd.; and A.K. Rajvanshi, Qatar Petroleum
IPTC 10686-ABSTRACT 2005

but for some reason it cant be downloaded or bought in full form, only abstract is available.

Let us communicate, share our knowledge and experience and take this site and forum from simply file sharing to the next level

[Shakespear]

You probable want to do something like this as this is a bear of a problem. I never met anyone doing one, but then I was always on traditional reservoirs where the client at most did horizontals.

[link Point to another website Only the registered members can access]
Good Luck

PS: I hunted around their papers and found this one

[link Point to another website Only the registered members can access]
It is a hit and miss unless you know Arabic

[link Point to another website Only the registered members can access]
Also, SLB has/had a program called Welltest, which allowed you to build a simulation model and then show the resulting well test response. An advance type curve matching technique. Otherwise you will need to build the model and simulate the pressure response to a given production/shutin regime.

[Damir]

Limitations in software use comes from clients and their request that we use Kappa Ecrin 4.02 or newer version to do all WT data analysis interpretation.
The solution for this may be, parallel work in both Slb WellTest and Ecrin and than, if results are normal ( we had trouble doing interpenetration for horizontal wells due to poor pressure measurements, extensive deformity of derivation curve... but we cant wait to see how this pressure response will look ) maby they will agree to use data obtained using WellTest...
Anyway, luckily we have some time to prepare, it is a good thing because I don’t know Arabic so it will take about 2 days to go trough

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Maybe we will be given permission to post online some kind of censored report with just technical problems and solutions, after this is done, for experience exchange
with colleagues, and we would like to keep this post alive and updated, when project starts as it is quite interesting task.

Experience still needed so please write

[Shakespear]

I randomly looked there (

[link Point to another website Only the registered members can access]
I think simulation is the way to go.

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[link Point to another website Only the registered members can access]
Here you will find the data set they used and the modeling of the well test. The DATA file can be downloaded

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In your case, Try doing this on a simple model with ECLIPSE or simulator that you use.

"The timestep size can be controlled to limit the expected maximum pressure change, and to
chop a timestep if a maximum tolerable pressure change has been exceeded. This facility
is useful when ECLIPSE is used to model well tests. (See the TUNING keyword.)"

"WBOREVOL Sets wellbore volume for modelling wellbore storage in well tests."

"WTEST Instructions for periodic testing of closed wells"