Apparatus and method for transferring whole core samples

• US 4,916,945 A
• Filed: 02/10/1989
• Issued: 04/17/1990
• Est. Priority Date: 02/10/1989
• Status: Expired due to Fees

• Current Assignee: Atlantic Richfield Company Incorporated (BP PLC)
• Original Assignee: Atlantic Richfield Company Incorporated (BP PLC)
• Inventors: Weisbrod, Kirk R.
• Primary Examiner(s): Williams, Hezron E.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/308,487
• Time in Patent Office: 431 Days
• Field of Search: 73/153, 73/863, 73/864.91, 53/442
• US Class Current: 73/863
• CPC Class Codes: E21B 25/005 Above ground means for handling the core, e.g. for extracting the core from the core barrel
• CPC Class Codes: E21B 25/08 Coating, freezing, consolidating cores E21B25/06 takes precedence; Recovering uncontaminated cores or cores at formation pressure

Abstract

An apparatus for transferring a whole core sample having a first end and an opposing second end from the interior of an inner barrel comprising:

a split receiving tube having an interior surface sized and adapted to receive the whole core sample from the inner barrel;

a liner made of heat shrink material extending over a substantial portion of the interior surface of the split receiving tube;

first and second discs sized and adapted to be placed on the first and second ends, respectively, of the whole core sample; and

a force assembly for forcing the whole core sample from the inner barrel into the liner in the split receiving tube.

Claims

1. An apparatus for transferring a whole core sample having a first end and an opposing second end from the interior of an inner barrel comprising:

a split receiving tube having an interior surface sized and adapted to receive the whole core sample from the inner barrel;

a liner made of heat shrink material extending over a substantial portion of the interior surface of said split receiving tube;

first and second discs sized and adapted to be placed in contact with the first and second ends, respectively, of the whole core sample; and

means for forcing the whole core sample from the inner barrel into said liner in said split receiving tube.

2. The apparatus of claim 1 which further comprises heating means for providing heat to shrink said liner around the whole core sample.

3. The apparatus of claim 1 which further comprises heating means for providing heat to shrink said liner around the whole core sample and the first and second discs.

4. The apparatus of claim 1 wherein said means includes a first piston located so as to contact said first disc and to which a primary force is applied to move the whole core sample out of the inner barrel.

5. The apparatus of claim 4 wherein said means further includes a second piston located so as to contact said second disc and to which a resisting force is applied to resist the movement of the whole core sample from the inner barrel.

6. The apparatus of claim 1 wherein the inner barrel has an exterior surface and said liner is sized and adapted to extend out from said split receiving tube over at least a portion of the exterior surface of the inner barrel.

7. The apparatus of claim 6 which further comprises a tube section having a conically shaped outer peripheral wall located between the inner barrel and said split receiving tube.

8. The apparatus of claim 1 which further comprises alignment means to align said split receiving tube with the inner barrel.

9. The apparatus of claim 1 wherein said heat shrink material is a polymeric material.

10. The apparatus of claim 1 wherein said heat shrink material is selected from the group consisting of polytetrafluoroethylene, fluorinated ethylene/propylene copolymers, polytetrafluoroethylene with perfluoroalkoxy side chains, polyvinylidene fluoride and mixtures thereof.

11. The apparatus of claim 1 wherein said material is selected from the group consisting of fluorinated ethylene/propylene copolymers and mixtures thereof.

12. The apparatus of claim 1 wherein each of said first and second discs is made of a material selected from the group consisting of metals and polymeric materials.

13. The apparatus of claim 8 wherein said alignment means includes one or more split clamp tubes fitted onto the inner barrel and said split receiving tube.

14. The apparatus of claim 8 wherein said inner barrel has an exterior surface, said liner extends out from said split receiving tube over at least a portion of the exterior surface of the inner barrel and said alignment means further acts to restrain said liner from movement while the whole core sample is being moved from the inner barrel to said split receiving tube.

15. The apparatus of claim 14 wherein said alignment means includes one or more clamps fitted onto the inner barrel and said split receiving tube.

16. A method for transferring a whole core sample having a first end and an opposing second end from the interior of an inner barrel comprising:

placing a split receiving tube having an interior surface sized and adapted to receive the whole core sample from the inner barrel in close proximity to the inner barrel so that the longitudinal axes of said split receiving tube and the inner barrel substantially align, said split receiving tube having a liner made of heat shrink material over a substantial portion of said interior surface;

placing first and second discs in contact with the first and second ends, respectively, of the whole core sample;

applying a force to the whole core sample to move the whole core sample from the inner barrel into said liner in said split receiving tube;

removing a portion of said split receiving tube; and

heating said liner to shrink said liner around said whole core sample.

17. The method of claim 16 which further comprises heating said liner to shrink said liner around said first and second discs.

18. The method of claim 16 which further comprises applying a resisting force to the whole core sample to resist the movement of the whole core sample from the inner barrel to said liner in said split receiving tube as said whole core is being moved from the inner barrel to said liner in said split receiving tube.

19. The method of claim 16 wherein the inner barrel has an exterior surface and said liner is sized and adapted to extend out from said split receiving tube over at least a portion of the exterior surface of the inner barrel.

20. The method of claim 16 wherein said heat shrink material is a polymeric material.

21. The method of claim 16 wherein said heat shrink material is selected from the group consisting of polytetrafluoroethylene, fluorinated ethylene/propylene copolymers, polytetrafluoroethylene with perfluoroalkoxy side chains, polyvinylidene fluoride and mixtures thereof.

22. The method of claim 16 wherein said heat shrink material is selected from the group consisting of fluorinated ethylene/propylene copolymers and mixtures thereof.

23. The method of claim 16 wherein each of said first and second discs is made of a material selected from the group consisting of metals and polymeric materials.