| Autor: |
Maria Teresa Ribeiro, Kamal Zubair, Mohamed Ahmed Abdullah Al Neaimi, Mohammed Ramadan Ayoub, Khalid Al Marzouqui, Mohamed Ben Saad, Suaad Khoori, Sultan Karrani, Irfan Hendrawan |
| Rok vydání: |
2006 |
| Předmět: |
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| Zdroj: |
All Days. |
| Popis: |
The objective of this paper is to present the use of real-time image interpretation during an intensive drilling campaign of horizontal wells in two major carbonate fields onshore Abu Dhabi. Seismic faults are identified using sophisticated methods for interpretation that revealed major faults as well as smaller ones. These are then calibrated using image logs while drilling the horizontal wells targeting the field development. Achieving the objective of drilling horizontal wells depends on an accurate well placement within the reservoir which is related with the presence of structural features like formation dips and presence of faults along the hole trajectory. Careful pre-job planning using offset well data and seismic maps and x-sections helps on reducing the uncertainty. However, the unpredictability of structural and stratigraphic reservoir features between planned and offset wells information is always present. Even the formation dips computed from seismic and offset wells are prone to some degree of error. The advances in real-time data transmission and LWD technology, namely resistivity and density image tools can be used for accurate modelling of the formation dips and structural anomalies and remedial actions taken immediately. This paper describes the use of real-time image data interpretation and the great value in making geosteering decisions while drilling into reservoirs with structural complex/ unknown geology or in areas with sparse geological/ structural information. Using image data, trajectories can be adjusted during drilling yielding optional well placement, but also actions for future wells, leading to a better success in the drilling campaign of long horizontal wells with a short tolerance radius. An integrated multidisciplinary workflow is presented from well planning, using all available data including previous well information and the continuous update of the reservoir understanding, to immediate decisions while drilling. Several examples illustrate the different phases leading to the well conclusion and the use of such valuable information in better reservoir knowledge. Finally, a comparison (LWD and WL) and value of information is also presented to highlight the advantages/ drawbacks of different tools on a case dependent selection. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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