| Autor: |
M. Doehler, J. Strobel, Arno Buysch, Jos Pragt, Matthias Meister, Hartmut Schrader, M. Bochem |
| Rok vydání: |
2005 |
| Předmět: |
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| Zdroj: |
All Days. |
| DOI: |
10.2118/92492-ms |
| Popis: |
New tools for Formation Testing While Drilling (FTWD) were introduced to the market less than two years ago. They are used in an increasing number of wells in a wide range of operating environments. The tools are capable of performing accurate tests in the dynamic drilling environment of rotary and rotary steerable drilling. They measure formation pressure and some provide formation mobility estimations in real-time. The application expands formation testing into extended reach drilling where pipe conveyed wireline testing is of high risk. It also allows formation pressure testing in boreholes where drilling risk or hole stability exclude conventional data acquisition. During FTWD operations circulation is maintained at all times to insure wellbore integrity. This presents a challenging dynamic environment for accurate formation pressure measurements. In this paper, the application of an FTWD tool in conjunction with a mud motor is described within an even more challenging environment, due to motor rotation and associated drillstring vibrations, as no circulation bypass valve was used. The Baker Hughes INTEQ TesTrak tool was capable of performing accurate formation pressure and mobility measurements with an overall success rate of over 80% in an extreme pressure and vibration environment. Pressure and mobility test results will be shown and compared to conventional wireline logging results from nearby wells. Mobility data, which are calculated downhole and transmitted to surface in real-time, are compared to previous well test data from neighboring wells. The FTWD mobility data showed a good match with reservoir simulation and core data, and even better agreement than the data derived from conventional wireline measurements. In this application the FTWD tool was run in combination with a triple combo LWD suite. This allowed real-time reservoir evaluation as well as optimizing pressure point selection during on-site formation evaluation. No additional wireline logs needed to be run afterwards and the hole could be cased immediately. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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