The Application of Downhole Seismic Imaging in Identifying Natural Fracture Systems; An Integrated Approach Utilizing Core and Borehole Image Data
- AimenAi Amer (Schlumberger) | Abdulazziz Sajer (Kuwait Oil Company) | Talal Al-Adwani (Kuwait Oil Company) | Hanan Salem (Kuwait Oil Company) | Reyad Abu-Taleb (Kuwait Oil Company) | Ali Abu-Guneej (Kuwait Oil Company) | Ali Yateem (Kuwait Oil Company) | Vishnu Chilumuri (Kuwait Oil Company) | Palkesh Goyal (Schlumberger) | Sambhaji Devkar (Schlumberger)
- Document ID
- Society of Petroleum Engineers
- SPE Middle East Oil and Gas Show and Conference, 18-21 March, Manama, Bahrain
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- 3 Production and Well Operations, 3.3 Well & Reservoir Surveillance and Monitoring, 2.1.3 Completion Equipment, 2.2.2 Perforating, 3.3.2 Borehole Imaging and Wellbore Seismic, 1.6.12 Plugging and Abandonment, 1.6 Drilling Operations, 2 Well completion, 3 Production and Well Operations, 1.6.11 Plugging and Abandonment, 1.6.9 Coring, Fishing, 2.2 Installation and Completion Operations
- Integration, borehole imaging, Borehole acoustic reflection survey, core analysis, Natural fracture identification
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Producing unconventional reservoirs characterized by low porosities and permeabilities during early stages of exploration and field appraisal can be challenging, especially in high temperature and high pressure (HPHT) downhole conditions. In such reservoirs, the natural fracture network can play a significant role in flowing hydrocarbons, increasing the importance of encountering such network by the boreholes.
Consequently, the challenge would be to plan wells through these corridors, which is not always easy. To add to the challenge, well design restrictions dictate, the drilling of only vertical and in minor cases deviated wells. This can reduce the possibility of drilling through sub-vertical fracture sets significantly, and once seismic resolution is considered, it may seem that all odds are agents encountering a fracture network.
This article addresses a case where a vertical well is drilled, in the above-mentioned reservoir setting, and missed the natural fracture system. The correct mitigation can make a difference between plugging and abandoning the well or putting it on production.
The technique utilized is based on a borehole acoustic reflection survey (BARS) acquired over a vertical well to give a detailed insight on the fracture network 120 ft away from the borehole. Integrating this technique with core and high-resolution borehole image logs rendered an excellent match, increasing the confidence level in the acoustically predicted fracture corridors.
Based on these findings new perforation intervals and hydraulic stimulation are proposed to optimize well performance. Such application can reverse the well decommissioning process, opening new opportunities for the rejuvenation of older wells.
|File Size||2 MB||Number of Pages||10|