Full bore sampler including inlet and outlet ports flanking an annular

Abstract

A formation fluid sampler adapted to be disposed in a wellbore includes a full bore and an outer housing. The outer housing includes an annular sample chamber having a first port disposed on one side of the chamber and a second port disposed on the other side of the chamber. The annular sample chamber further includes a fluid sample parameter transducer adapted for measuring a parameter of the fluid sample trapped in the annular sample chamber, and an EPROM memory for instantly storing the parameter measured by the transducer when the sample was initially taken by the sampler. The sampler also includes a piston disposed within the outer housing and adapted to move axially in the sampler in response to an annulus pressure around the sampler. The piston defines the full bore of the sampler and includes a first port adapted to move into congruence with the first port of the outer housing and a second port adapted to move into congruence with the second port of the outer housing in response to the axial movement of the piston. When the ports are congruent, one side of the annular sample chamber fluidly communicates with the full bore of the sampler and the other side of the annular sample chamber fluidly communicates with the full bore of the sampler. A full bore valve is connected to the piston and is disposed within the full bore of the sampler. When the piston moves axially in response to an increase of the annulus pressure around the sampler, the first and second ports move into congruence and and the full bore valve opens the full bore of the sampler.