Apparatus and method for obtaining a core at in situ pressure
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A method and apparatus are disclosed for obtaining a core at in situ pressure of sedimentary deposits at the bottom of a well bore or body of water. The core barrel has a pressure chamber that is closed and opened by a ball valve actuated from the surface. When in position above the sedimentary deposits to be cored, a sample tube is extended from the pressure chamber into the sedimentary deposits to obtain a core. The sample tube is retracted into the pressure chamber and the valve closed to trap ambient pressure in the chamber. The sample tube and valve are operated from the surface.
Milberger, Lionel J.; Denk, Eddie W.; Hostrup, Kai R. (1982). Apparatus and method for obtaining a core at in situ pressure. United States. Patent and Trademark Office; Texas A&M University. Libraries. Available electronically from