| 摘要 |
<p>A sampler valve including a tubular housing defining a cylindrical chamber of enlarged diameter in comparison to the remainder of the full bore extending through the valve, an axially slidable sample chamber mandrel adapted to span the length of the enlarged diameter chamber in a sealing manner to thereby create an annular sample chamber while simultaneously trapping a fluid sample therein, and drain means to remove a trapped sample from the sample chamber. The sample chamber mandrel is operated by a power mandrel responsive to a predetermined level of well annulus pressure surrounding the sampler valve, the power mandrel being initially secured in place against axial movement by shear means shearable at the aforesaid predetermined pressure. A time-delay means to retard the movement of the power mandrel after shearing of the shear means is also included.</p> |
