Could you please advise me in the following:

There is new oil discovery in carbonate structure with one oil well and evaluation the structure is needed .The new appraisal well is plane. My suggestion is to conduct extended well test for long term and interference test could you please advise with outlines and any materials how to commence the program i.e steps of the test to get good output for analysis and good evaluation the new discovery.

Thank you in advance for your help and your time
Best regards,
I got a the message above (quoted) asking for advices on how to design a well test for an oil well in a carbonate reservoir. I reply here since this member's inbox is full. I also encourage other forum members to share their comments:

PTA is not my area of expertise, however I'll tell you what I've done in the past when I've had to design or interpret well tests:

1. Clearly establish the goals of the well tests (make a wishlist if you want).
2. Make simple calculation of stabilization time to roughly estimate the time require for transients to reach the outer boundaries of the reservoir or drainage area (refer to SPE monograph by Earlougher "Advances in Well Test Analysis, p.18-19"). This gives you a broad idea of the test duration.
3. A formal test design must be done (by means of using any commercial software such as Saphir, PanSystem, etc). Designing a well test involves pretty much the same analysis required for an interpretation. Here you have to simulate the pressure response based on best-estimates of reservoir parameters, skin, and so on. The idea is to support that the test will eventually meet its objectives, i.e. that wellbore storage won't interfere (if it does you might think of shutting-in the well downhole), that the boundaries will be reached within the time given by the test, etc. Take a look at the mechanical status of the well to be tested, make sure you have good cement and mechanical conditions in general.
4. Take a look at the sensitivity of the pressure gauges that will be used for the test and the amount of data that can be recorded. This step might involved field staff engineers. Talk to the service company that will provide the pressure gauges, they might be of help too.

Finally, take a look at these two references for more details, ref1 is short and easy to understand, read that one first and then use ref2 for more details (ref2 is the book I prefer to use when I've had to work with PTA):

Ref1:

[link Point to another website Only the registered members can access] Ref2: EARLOUGHER - Advances In Well Test Analysis. Get it from here:

[link Point to another website Only the registered members can access]
Regards,