Layered Reservoir Testing
Definition - What does Layered Reservoir Testing mean?
Layered Reservoir Testing is an advanced technique of testing the presence of hydrocarbons in layer by layer reservoirs (multilayered reservoirs) under one another. This technique makes use of a combination of pressure measurements, transient rates and stabilized flow profiles to find out the radial permeability and skin factors for each of the layers. In order to give results, this technique requires multiple flow rate changes from a reservoir with at least one flow rate change for each layer that needs to be characterized for hydrocarbon properties and reservoir pressure.
Petropedia explains Layered Reservoir Testing
When a Layered Reservoir Test is being carrying, it is based on the assumptions that the hydrocarbon reservoir is a homogeneous single layer. However, in the real scenario, there are many cases in which multiple layers of hydrocarbon reservoirs are found at various depths. It may occur that one operator is operating on a top reservoir and other operator is operating at same place, but on the bottom reservoir. Thus wells from such places may produce more than one reservoir layer. Also these vertically layered reservoirs can be homogeneous or heterogeneous which means that crude oil in both the reservoirs may or may not have similar properties and characteristics. Thus to understand the properties of hydrocarbons in these multilayered reservoirs, Layered Reservoir Testing techniques are used. Generally if such multilayered reservoirs are detected, the reservoir is called as cross flow systems and usually cross flow of hydrocarbons will be there if the two layers are just below one another, thus radial permeability and skin factor needs to be evaluated from both reservoirs.