Pressure core barrel
05-19-2011, 03:54 PM
|Pressure core barrel
In such a pressure core barrel assembly it is important to know that the pressure core barrel has been sealed at formation pressure before the barrel is raised to the surface. If it is not sealed the sample will not be representative of the actual conditions existing in the formation at the bottom of the well.
The present invention provides an improved barrel pressure of the type generally described in the above Blackwell et al Pat. First, the outer barrel (containing within it the core barrel) which is to seal the assembly at formation pressure is positively latched in both the raised (coring) position and the lowered (sealing) position. The arrangement of parts also provides for positive hydraulic assist for moving the outer barrel downwardly during the sealing operation to overcome any friction present at the bottom of the well.
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