What is the importance of repeated formation tester in reservoir evaluation?

to measure formation pressure to be interpreted to get fluids gradient to get fluid contacts and also give indication for mobilites.

RFT allows us to determine several important reservoir parameters, which include;

• Identifying the fluid contact(s) 

• Determining the pressure gradients of the fluids within the reservoir

• Identify perched water contacts

• Identify the sealing type of faults/boundaries

1- To Identify the following:

a-Reservoir Pressure, and Temperature

b-Fluid Gradient and so the fluid Type

c-Identify the contact (GOC - OWC - or GWC).

2- Have an essential rule in:a- identify the formation mobilty and so the permeablity (Not accurate offcourse as core analysis and Well test ) but it give a range that help.

b-The most important part for me in my opinion "Using RFT/RDT analysis interpretation and correlate it with the nighbour wells could easly identify the pressure system and so the connectivity between reservoirs especcially in stratigraphic reservoirs thast consists of more than 1 layer each layer is an independent pressure system and so you have to take care of that in OGIP/OOIP calculation.

It provides essential information about the fluids contacts in the pay zone. This is essential to reasonably determine the accurate perforation depth to avoid early coning problem.

- To determine reservoir pressure

- defined top and bottom of layer/layer

- to get PVT samples

reservoir consists 1-rock properties 2-fluid properties

so 

Formation properties to determine the density and porosity-permeability formations can choose the kind of fluid flow and selection production layer

it is useful to isolate small sections of the pay and remove fluid samples