Patent ID: 8528394

Claim:
An assembly for transient and continuous testing of an open portion of a well bore, said assembly being arranged in a lower part of a drill string, and is comprising: a minimum of two packers fixed at the outside of the drill string, said packers being expandable for isolating a reservoir interval, a down-hole pump for pumping formation fluid from said reservoir interval, a sample chamber, sensors for measuring fluid properties, a closing valve for closing fluid flow from said reservoir interval, characterised in that said assembly further is comprising: sensors and telemetry for measuring and real-time transmission of flow rate, pressure and temperature of the fluid flow in or from each of four locations from said reservoir interval, from said down-hole pump, in the drill string and in an annulus above the packers, a mud driven turbine or electric cable for energy supply to said down-hole pump, and a circulation unit for mud circulation from a drill pipe to said annulus above the packers and for feeding formation fluid from said down-hole pump to said annulus, said circulation unit being operable to circulate mud to said annulus, and to feed formation fluid from said reservoir interval into said annulus, so that a well at any time can be kept in over balance and so that the mud in said annulus at any time can dissolve the formation fluid from said reservoir interval.