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Effectiveness of SWTorpedo Stimulation
Preferable depth of producing interval for:
| |
·
Oil wells |
up to 13,200ft |
|
·
Gas wells |
up to 14,800ft |
|
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Preferable characteristics or the source rock:
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= 3.5 106Psi
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= 0.25
|
= 0.1 - 20md
|
Where:
- is a Young’s modulus;
- is Poisson’s ratio;
- is permeability.
Highly compressible components such as clay, loam, etc. - 10% |
|
|
Young’s modulus
|
Representative Characteristics
of the Rock Formations
|
Results of SWTorpedo
Stimulation
|
|
6 to 7, *106
|
Sandstone (strong and clean)
|
Best
|
4.5 to 5.5, *106
3.0 to 4.5, *106
3.0 to 4.5, *106
3.0 to 3.5, *106
|
Sandstone (medium strength)
Limestone (strong and dense or medium strength)
Dolomite, Sandstone (weak)
Granite
Shale (strong)
|
Very Good |
2.5 to 3.0, *106
2.0 to 2.5, *106
1.0 to 1.5, *106 |
Shale (medium strength)
Sandstone (clayey)
Limestone (clayey)
Coal (hard)
|
Good |
2.0 to 2.5, *106
|
Shale (weak with admixtures)
Sandstone (weak with admixtures)
|
Acceptable |
|
|
Sandstone (weak with high moisture)
Shale (strong and/or with high moisture)
Tuff
Sulfuric ore (with < than 30% of sulfur)
|
Questionable |
|
|
Tuff (high moisture)
Sulfuric ore (with < than 50% of sulfur)
Soil
|
Poor |
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