| Autor: |
Liao Yi, Purbasha Halder, Sandip Maity, Stewart Brazil, Nagapriya Kavoori |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
Day 4 Thu, November 16, 2017. |
| DOI: |
10.2118/188437-ms |
| Popis: |
Moving gas show analysis from surface to downhole at the drill bit has the advantages of identifying sweet spots directly and immediately, enabling focused stimulation which can lead to improved well production and EOR, and to optimized completion, and kick detection at the bit. We have explored the use of optical spectroscopy for gas show at the drill bit. Based on our initial study we identified two potential approaches – a Raman spectroscopy-based approach where the gas concentration is measured in-situ in the dissolved state, and an absorption spectroscopy-based approach where gas is extracted out and tested. While the approach where the gas is tested in-situ would be the preferred one, the high risk involved here led us to simultaneously develop the extractive approach. Proof-of-concept experiments have been performed to down-select the most appropriate approach. We have been able to demonstrate that both methods can detect methane at the desired concentration levels down to better than 1%. It has been concluded that since dissolved methane at the required concentration can be detected using the non-extractive approach, it would be most suitable to use the Raman-based gas detection for downhole gas show at the drill bit. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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