SPE DL: Where Are We After 15 Years with Advanced Wireline Tools

Thursday, 20 October 2005 Read 4798 times
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Advanced wireline formation testers first appeared around 1989. After about 15 years, the tools have proven to be very useful for formation evaluation with four major applications: pressure surveys, downhole fluid sampling, interval, ...

Abstract:

Advanced wireline formation testers first appeared around 1989. After about 15 years, the tools have proven to be very useful for formation evaluation with four major applications: pressure surveys, downhole fluid sampling, interval pressure transient testing and stress testing via micro-fracturing.

Following the introduction of such tools, drastic changes happened in the way formations and reservoirs are evaluated. Pressure information was available faster and was more reliable. Samples could be obtained for PVT analysis at several depths. Transient tests provided permeability information within tens of feet away from the wellbore. Micro-frac tests helped calibrate stress models, help design fracture treatments and solved wellbore stability problems.

After fifteen years of experience where do we stand ? Is asking formation testers to replace full scale well tests a fair question ? Can we handle mud contamination in samples ? What is the use of interval pressure transients and how do they compare to well tests ? Is water sampling is as easy as some believe ? We are moving to an era where we start to provide downhole fluid analysis, such as GOR and composition, H2S and pH as a start. In short, what is the status, what have we learned and hints of where we are going in formation testing.

Biography:

Dr. Cosan Ayan is currently based inJakarta, Indonesia and is a Reservoir Engineering Advisor for Schlumberger Oilfield Services. Previously, he was the Principal Reservoir Engineer / Account Manager in United Kingdom based in Aberdeen. He also held similar positions for Schlumberger Central Gulf Division based in Abu Dhabi, and Schlumberger East Mediterranean Division in based in Cairo. He works on interpretation and development projects, focusing on wireline formation testers, transient well tests, production logging and reservoir monitoring. Dr. Ayan joined Schlumberger in July 1990 and worked with Schlumberger Reservoir Characterization Services based in Dubai.

Dr. Ayan holds BS degree from Middle East Technical University-Ankara, MS and Ph.D. degrees from Texas A&M University-College Station all in Petroleum Engineering. He is the author of more than 40 technical papers on well testing and reservoir engineering. Currently he is a Review Chairman for the SPE Reservoir Evaluation & Engineering and served as a Steering Committee member for the SPE 1994 Middle East Well Testing Forum and as a Technical Committee member for the 1996 ADIPEC.

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