Short-term Pressure Transient Analysis performed in open-hole well with wireline pressure gauge.
Can be complemented by downhole fluid sampling with the same toolstring.
The key objective is to measure formation pressure and permeability at specified downhole locations.
It usually does not reach the fully developed radial flow to assess the reservoir thickness.
| Gas-Oil Gradient Change | Pick OGC |
| Water-Oil Gradient Change | Pick FWL |
| The pressure of some HC beddings stay at initial pressure while most others deplete | Means that these beddings are not depleted and should be connected to production |
| The pressure of some HC beddings is much lower than most others | Means that these layers deplete faster |
| The pressure of some HC beddings is much higher than most others | Means that these beddings are getting a better pressure support from aquifer or gas cap or water injection |
| The pressure in overlying/underlying water reservoir is regular | Means that most probably the area around the new well did not face the thief production/injection |
| The pressure in overlying/underlying water reservoir is lower than that of oil/gas pay | Means that most probably the area around the new well was subject to thief production |
| The pressure in overlying/underlying water reservoir is higher than that of oil/gas pay | Means that most probably the area around the new well was subject to thief injection |
See Also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Subsurface Well Testing / Open-Hole Well Test
[ Well & Reservoir Surveillance ]