Geomechanics Aspects of Multiple Fracturing of Horizontal and Vertical Wells
- Mohamed Y. Soliman (Halliburton Energy Services Group) | Loyd E. East (Halliburton Energy Services Group) | David Lee Adams (Halliburton Energy Services Group)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- September 2008
- Document Type
- Journal Paper
- 217 - 228
- 2008. Society of Petroleum Engineers
- 2.5.2 Fracturing Materials (Fluids, Proppant), 1.2.2 Geomechanics, 4.1.5 Processing Equipment, 5.8.6 Naturally Fractured Reservoir, 2.5.4 Multistage Fracturing, 4.1.2 Separation and Treating, 5.6.4 Drillstem/Well Testing, 2 Well Completion, 3 Production and Well Operations, 2.2.2 Perforating, 5.8.2 Shale Gas, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 2.5.1 Fracture design and containment, 1.6 Drilling Operations
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Although unstimulated horizontal wells have been successful in naturally fractured reservoirs and in reservoirs with gas- or water-coning problems, fracturing a horizontal well may be a viable option in certain situations. Because of the dependence of fracture orientation on well direction with respect to the stress field, the possibility of fracturing a horizontal well must be considered before the well is drilled. The appropriate contingency plans should be made to anticipate the possible low production from an unstimulated well. It should be remembered that fracturing a horizontal well may also dictate how the wellbore may be completed or oriented. Fracturing a horizontal well may take place in one of the following situations:
- Restricted vertical flow caused by low vertical permeability or the presence of shale streaks.
- Low formation productivity because of low formation permeability.
- The presence of natural fractures in a direction different from that of induced fractures. Thus, induced fractures have a high chance of intercepting the natural fractures.
- Low stress contrast between the pay zone and the surrounding layers. In this case, a large fracturing treatment of a vertical well would not be an acceptable option because the fracture would grow in height as well as length. Drilling a horizontal well and creating either several transverse or longitudinal fractures would allow rapid depletion of the reservoir through the fractures.
Although fundamentally similar to fracturing vertical wells, fracturing horizontal wells has its unique aspects that require special attention to secure successful treatment. Differences between horizontal and vertical wells exist in areas of rock mechanics, reservoir engineering, and operational aspects. To start with, the basic rock-mechanics aspects are examined.
|File Size||1 MB||Number of Pages||12|
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