In a production well, as flow-valves is opened and fluids starts to flow, BHP decreases. Measurements of pressure drop in such a well is called "Pressure Draw-Down Test". On the other hand, when the well is closed, BHP increases. Measurements of building up of pressure of such a well is called "Pressure Build-Up Test".
In an injection well, as injection starts BHP increases. Measurements of pressure building up in such a well is called "Pressure Build-Up (Injection) Test". On the other hand, when the well is closed, injection stops and BHP decreases. Measurements of pressure fall in such a well is called "Pressure/Injection Fall-Off Test".
In an injection well, as injection starts BHP increases. Measurements of pressure building up in such a well is called "Pressure Build-Up (Injection) Test". On the other hand, when the well is closed, injection stops and BHP decreases. Measurements of pressure fall in such a well is called "Pressure/Injection Fall-Off Test".
The event of closing or opening of a well creates an impulse in the reservoir. The pressure wave propagates into the reservoir and if a boundary is found, it reflects backs just like a stone dropped in a water body does. Thus, the fluctuations in pressure carries many important information of the boundary as well as the reservoir itself.
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| Figure-1: A depiction of pressure wave spreading from the well and bouncing back from a fault providing estimates of the distance of the fault from the well location. |
Sir, there probably is some typing error. The first test you mentioned about should be pressure drawdown test (not Pressure Fall Off test, which is done in a water injector after it is shut in).
ReplyDeleteSr, I think this article was right. In injection well, when we shut in well, we measure the change of pressure vs time, it's called Fall Off test. Perhaps you're confusing.
DeleteThanks for pointing out. Let me try to rectify.
ReplyDelete