Ann: Mbelele-1 Reaches TD, page-37

The well was drilled intentionally ‘over-balance’ for safety reasons. Therefore, the wireline data are now being further
studied to identify potential points for further gas and fluid sampling, where feasible and appropriate,
using modular formation dynamic tester (MDT) and/or mini-DSTs.

"Over balance meaning" - The amount of pressure (or force per unit area) in the wellbore that exceeds the pressure of fluids in the formation. This excess pressure is needed to prevent reservoir fluids (oil, gas, water) from entering the wellbore.


The Schlumberger MDT* Modular
Formation Dynamics Tester tool
provides fast and accurate pressure
measurements and high-quality fluid
sampling. It can also measure permeability anisotropy. In a single trip, the
MDT tool is able to acquire most of the
data requirements needed for accurate
and timely decision making.

What is the DST test procedure?
A drill stem test (DST) is a method of formation evaluation. The test allows fluids in the formation being evaluated to flow into the drill stem and to the surface. Pressure-recording devices in the drill stem test tool measure and record pressure in the well while it is both flowing and not flowing (shut in).

I'm loading up at .14c