Systems and methods for the recovery of lost circulation and similar material

• US 8,113,356 B2
• Filed: 10/10/2008
• Issued: 02/14/2012
• Est. Priority Date: 10/10/2008
• Status: Active Grant

• Current Assignee: National Oilwell Varco LP (NOV, Inc.)
• Original Assignee: National Oilwell Varco LP (NOV, Inc.)
• Inventors: Burnett, George Alexander
• Primary Examiner(s): Rodriguez, Joseph C
• Assistant Examiner(s): Kumar, Kalyanavenka Teshware
• Application Number:
  US12/287,709
• Publication Number:
  US 20100089802A1
• Time in Patent Office: 1,222 Days
• Field of Search: 209/311, 209/314, 209/315, 209/360
• US Class Current: 209/315
• CPC Class Codes: B07B 1/46 Constructional details of screens in general; Cleaning or heating of screens
• CPC Class Codes: B07B 2201/04 Multiple deck screening devices comprising one or more superimposed screens
• CPC Class Codes: B07B 2230/01 Wet separation

Abstract

Methods and systems are disclosed employing a quad-tier shale shaker for processing a mixture of drilling fluid and solids which solids include, in one aspect, lost circulation material (and/or material of size similar to the size of the lost circulation material). This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).

Claims

1. A system that is adapted for separating a mixture comprising drilling fluid and solids material, said system comprising:

a first screen deck that is adapted to receive a flow of said mixture and separate at least a first portion of said flow of said mixture into a first separated solids portion and a first screen outflow comprising drilling fluid and a first unseparated solids portion;

a second screen deck that is arranged in a series flow configuration with said first screen deck, wherein said second screen deck is positioned below said first screen deck and is adapted to receive said first screen outflow and separate said first screen outflow into a second separated solids portion and a second screen outflow comprising drilling fluid and a second unseparated solids portion;

a third screen deck that is positioned below said second screen deck and is adapted to receive said second screen outflow and separate at least a first portion of said second screen outflow into a third separated solids portion and a third screen outflow comprising drilling fluid and a third unseparated solids portion;

a fourth screen deck that is arranged in a parallel flow configuration with said third screen deck, wherein said fourth screen deck is positioned below said third screen deck and is adapted to receive at least a second portion of said second screen outflow and separate said at least said second portion into a fourth separated solids portion and a fourth screen outflow comprising drilling fluid and a fourth unseparated solids portion;

a first flow diversion apparatus comprising a first overflow weir and a first flow channel apparatus, wherein said first flow diversion apparatus is adapted to create said parallel flow configuration between said third and fourth screen decks; and

a second flow diversion apparatus comprising a second flow channel apparatus, wherein said second flow diversion apparatus is adapted to divert said third screen outflow so as to bypass said fourth screen deck.

2. The system of claim 1, wherein said first screen deck comprises a first screen mesh comprising a first mesh size that is adapted to separate solids material of a first size having a largest dimension equal to or larger than a first specified dimension from said flow of said mixture and to permit drilling fluid and solids material having a largest dimension smaller than said first specified dimension to pass therethrough.

3. The system of claim 2, wherein said second screen deck comprises a second screen mesh comprising a second mesh size that is adapted to separate solids material of a second size having a largest dimension equal to or larger than a second specified dimension from said first screen outflow and to permit drilling fluid and solids material having a largest dimension smaller than said second specified dimension to pass therethrough.

4. The system of claim 3, wherein said second screen mesh is adapted to separate and remove lost circulation material.

5. The system of claim 3, wherein said second screen mesh is adapted to permit solids material having a largest dimension of 1/16inch or smaller to pass therethrough.

6. The system of claim 3, wherein said second screen deck is adapted to separate and remove at least 75% of said solids material of said second size.

7. The system of claim 3, wherein said second screen deck is adapted to separate and remove at least 95% of said solids material of said second size.

8. The system of claim 3, wherein said third screen deck comprises a third screen mesh comprising a third mesh size that is adapted to separate solids material of a third size having a largest dimension equal to or larger than a third specified dimension from said at least said first portion of said second screen outflow and to permit drilling fluid and solids material having a largest dimension smaller than said third specified dimension to pass therethrough.

9. The system of claim 8, wherein said fourth screen deck comprises a fourth screen mesh comprising a fourth mesh size that is adapted to separate solids material of a fourth size having a largest dimension equal to or larger than a fourth specified dimension from said at least said second portion of said second screen outflow and to permit drilling fluid and solids material having a largest dimension smaller than said fourth specified dimension to pass therethrough.

10. The system of claim 9, wherein said second mesh size is smaller than said first mesh size, and said third and fourth mesh sizes are smaller than said second mesh size.

11. The system of claim 10, wherein said fourth mesh size is smaller than said third mesh size.

12. The system of claim 1, further comprising a vibratable basket, wherein said first, second, third and fourth screen decks are mounted in said vibratable basket and are adapted to be vibrated therewith.

13. The system of claim 1, wherein said first flow channel apparatus comprises at least one substantially vertical flow passage that is adapted to direct said at least said second portion of said second screen outflow to at least one substantially horizontal flow passage that is adapted to direct said at least said second portion to said fourth screen deck.

14. The system of claim 1, wherein said second flow channel apparatus comprises at least one substantially horizontal flow passage that is adapted to direct said third screen outflow to at least one substantially vertical flow passage that is adapted to direct said third screen outflow to a sump positioned below said fourth screen deck, wherein said sump is adapted to receive a combined flow of said third and fourth screen outflows.

15. The system of claim 1, further comprising a reclamation apparatus adapted to receive reclamation material comprising separated solids from at least one of said first, second, third and fourth screen decks.

16. The system of claim 15, further comprising an auger apparatus adapted to move reclamation material comprising separated solids from at least one of said first, second, third and fourth screen decks to said reclamation apparatus.

17. The system of claim 1, wherein said first screen deck comprises a second overflow weir that is adapted to permit at least a second portion of said flow of said mixture to bypass said first screen deck.

18. The system of claim 1, wherein at least one of said first, second, third and fourth screen decks comprises a flow chute positioned therebelow.

19. A system that is adapted for separating a mixture comprising drilling fluid and solids material, said system comprising:

a first screen deck that is adapted to receive a flow of said mixture and separate said flow of said mixture into a first separated solids portion and a first screen outflow comprising drilling fluid and a first unseparated solids portion;

a second screen deck that is positioned below said first screen deck and is adapted to receive said first screen outflow and separate at least a first portion of said first screen outflow into a second separated solids portion and a second screen outflow comprising drilling fluid and a second unseparated solids portion;

a third screen deck that is arranged in a parallel flow configuration with said second screen deck, wherein said third screen deck is positioned below said second screen deck and is adapted to receive at least a second portion of said first screen outflow and separate said at least said second portion into a third separated solids portion and a third screen outflow comprising drilling fluid and a third unseparated solids portion;

a fourth screen deck that is arranged in a series flow configuration with a combination of said second and third screen decks, wherein said fourth screen deck is positioned below said third screen deck and is adapted to receive a combined flow of said second and third screen outflows from said second and third screen decks, respectively, and separate said combined flow into a fourth separated solids portion and a fourth screen outflow comprising drilling fluid and a fourth unseparated solids portion;

a first flow diversion apparatus comprising an overflow weir and a first flow channel apparatus, wherein said first flow diversion apparatus is adapted to create said parallel flow configuration between said second and third screen decks; and

a second flow diversion apparatus comprising a second flow channel apparatus, wherein said second flow diversion apparatus is adapted to create said series flow configuration between said combination of said second and third screen decks and said fourth screen deck.

20. The system of claim 19, wherein said first screen deck comprises a first screen mesh comprising a first mesh size that is adapted to separate solids material of a first size having a largest dimension equal to or larger than a first specified dimension from said flow of said mixture and to permit drilling fluid and solids material having a largest dimension smaller than said first specified dimension to pass therethrough, wherein said second screen deck comprises a second screen mesh comprising a second mesh size that is adapted to separate solids material of a second size having a largest dimension equal to or larger than a second specified dimension from said at least said first portion of said first screen outflow and to permit drilling fluid and solids material having a largest dimension smaller than said second specified dimension to pass therethrough, wherein said third screen deck comprises a third screen mesh comprising a third mesh size that is adapted to separate solids material of a third size having a largest dimension equal to or larger than a third specified dimension from said at least said second portion of said second screen outflow and to permit drilling fluid and solids material having a largest dimension smaller than said third specified dimension to pass therethrough, and wherein said fourth screen deck comprises a fourth screen mesh comprising a fourth mesh size that is adapted to separate solids material of a fourth size having a largest dimension equal to or larger than a fourth specified dimension from said second and third screen outflows and to permit drilling fluid and solids material having a largest dimension smaller than said fourth specified dimension to pass therethrough.

21. The system of claim 20, wherein said second and third mesh sizes are smaller than said first mesh size and said fourth mesh size is smaller than each of said second and third mesh sizes.

22. The system of claim 21, wherein said third mesh size is smaller than said second mesh size.

23. The system of claim 19, wherein said second flow diversion apparatus is adapted to divert said second screen outflow so as to bypass said third screen deck.

24. The system of claim 19, further comprising:

a vibratable basket, wherein said first, second, third and fourth screen decks are mounted in said vibratable basket and are adapted to be vibrated therewith; and

a sump positioned below said vibratable basket, wherein said sump is adapted to receive said fourth screen outflow.

25. A system that is adapted for separating a mixture comprising drilling fluid and solids material, said system comprising:

a first screen deck that is adapted to receive a flow of said mixture and remove a first portion of said solids material therefrom;

a second screen deck that is arranged in series flow configuration with said first screen deck, wherein said second screen deck is adapted to receive a flow of a first effluent mixture leaving said first screen deck and remove a second portion of said solids material therefrom;

a third screen deck that is adapted to receive a flow of a second effluent mixture leaving said second screen deck and remove a third portion of said solids material from at least a first portion of said flow of said second effluent mixture;

a fourth screen deck that is arranged in a parallel flow configuration with said third screen deck, wherein said fourth screen deck is adapted to receive at least a second portion of said flow of said second effluent mixture and remove a fourth portion of said solids material therefrom;

a first flow diversion apparatus comprising an overflow weir and a first flow channel apparatus, wherein said first flow diversion apparatus is adapted to create said parallel flow configuration between said third and fourth screen decks; and

a second flow diversion apparatus comprising a second flow channel apparatus, wherein said second flow diversion apparatus is adapted to divert a flow of a third effluent mixture leaving said third screen deck so as to bypass said fourth screen deck.

26. A system that is adapted for separating a mixture comprising drilling fluid and solids material, said system comprising:

a first screen deck that is adapted to receive a flow of said mixture and remove a first portion of said solids material therefrom;

a second screen deck that is adapted to receive a flow of a first effluent mixture leaving said first screen deck and remove a second portion of said solids material from at least a first portion of said flow of said first effluent mixture;

a third screen deck that is configured in parallel flow with said second screen deck, wherein said third screen deck is adapted to receive at least a second portion of said flow of first effluent mixture and remove a third portion of said solids material therefrom;

a fourth screen deck that is adapted to receive a flow of a second effluent mixture leaving said second screen deck and a flow of a third effluent mixture leaving said third screen deck and remove a fourth portion of said solids material therefrom, wherein said flows of said second and third effluent mixtures from said second and third screen decks, respectively, to said fourth screen deck is configured to be in series;

a first flow diversion apparatus comprising an overflow weir and a first flow channel apparatus, wherein said first flow diversion apparatus is adapted to create said parallel flow of said at least said first and second portions of said flow of said first effluent mixture;

a second flow diversion apparatus comprising a second flow channel apparatus, wherein said second flow diversion apparatus is adapted to divert said flow of said second effluent mixture leaving said second screen deck so as to bypass said third screen deck.