Breakthrough in 22-in.-Hole Drilling in Kuwait Deep Wells
- Mohammed J. Al-Saeedi (Kuwait Oil Company) | Mahesh Sounderrajan (Kuwait Oil Company) | Hadi S. Al-Ajmi (Kuwait Oil Company) | Dakhil R. Al Enezi (Kuwait Oil Company) | David C. Mckinnell (Total Kuwait)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- March 2011
- Document Type
- Journal Paper
- 2011. Society of Petroleum Engineers
- 1.5.1 Bit Design, 5.3.4 Integration of geomechanics in models, 1.6 Drilling Operations
- motor, bit, drilling, design, performance
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- 580 since 2007
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High-pressure/high-temperature exploration activities in Kuwait include thedrilling of deep wells (approximately 16,500 ft) to search for high-quality oilfrom the Jurassic formations. Recent discoveries of commercial gas and lightoil in six of the North Kuwait oil fields have resulted in the startup of theNorth Kuwait Gas Development Project. This project is a major venture with aplanned production growth up to 1,000 MMscf/D of gas and 350,000 B/D of lightoil, which requires a total of more than 90 new wells. For this new phase ofdevelopment, the challenge was to change the approach to the drilling of deepwells to reduce overall project timing and cost. A rethinking of currentdrilling methods was required along with the application of new technologysolutions to optimize drilling times.
The North Kuwait deep-well design is complex and requiressurface/intermediate casings to be set at maximum depths to reach target depth(TD) in a workable hole size. The 22-in. hole is drilled from 6,000 to 9,500 ftand was considered to have a potential for improvement. A conceptual projectwas set up that would attempt to replace multiple 22-in.-insert-bit runs,rotary driven, with a single polycrystalline-diamond-compact (PDC) bit designrun on a downhole motor. The objective was to establish a partnership approachwith the bit manufacturer and motor provider and to develop bit designs,equipment specifications, and operational parameters over the projectperiod.
The bit design team identified the main aspects on which the new PDC-bitdesign was to be based, and a prototype bit was manufactured. Results from thefirst run of the bit were analyzed, and the design was modified for the secondrun. A critical element was the development of the downhole motor, with amore-powerful 12 3/4-in. motor with precontoured stator being used for thesecond and subsequent runs. Bit designs and downhole-motor and rig-equipmentspecifications were developed and improved on over the project, resulting inthe achievement of the project goal with the drilling of the entire 22-in.section with one bit from shoe to shoe. The performance improvements in thetrial wells gave substantial increases in rate of penetration (ROP) and reduceddrilling times.
|File Size||2 MB||Number of Pages||11|
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