Vibratory separators and screens

• US 20090057205A1
• Filed: 08/31/2007
• Published: 03/05/2009
• Est. Priority Date: 08/31/2007
• Status: Active Grant

• Current Assignee: Varco I/P Incorporated (NOV, Inc.)
• Original Assignee: Varco I/P Incorporated (NOV, Inc.)
• Inventors: Dufilho, Paul William, Larson, Thomas Robert, Schulte, David Lee JR.
• Granted Patent: US 8,622,220 B2
• Time in Patent Office: Days
• US Class Current: 209/401
• CPC Class Codes: B07B 1/4618 Manufacturing of screening surfaces
• CPC Class Codes: B07B 1/4663 Multi-layer screening surfaces
• CPC Class Codes: B07B 1/4672 Woven meshes
• CPC Class Codes: E21B 21/065 Separating solids from drilling fluids

Abstract

A screen for a vibratory separator, the screen including at least two layers of screening material, at least part of the at least one layer of screening material coated with a coating containing nickel or chromium, the at least two layers of screening material including a first layer and a second layer, the first layer made of a plurality of intersecting first wires, the second layer made of a plurality of intersecting second wires, the first wires including first shute wires and first warp wires, each of the first shute wires at a right angle to first warp wires, each of the first warp wires at a right angle to first shute wires, the second wires including second shute wires and second warp wires, each of the second shute wires at a right angle to second warp wires, each of the second warp wires at a right angle to second shute wires, each of the first warp wires aligned with a second warp wires, and each of the first shute wires aligned with a second shute wire. 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 CFR 1.72(b).

Claims

1. A screen for a vibratory separator, the screen comprising

at least two layers of screening material,

the at least two layers of screening material including a first layer and a second layer, the first layer made of a plurality of intersecting first wires, the second layer made of a plurality of intersecting second wires, the first layer above the second layer,

each of a plurality of the first wires aligned with a corresponding second wire according to a preselected wire count ratio,

a panel combined with the at least two layers of screening material,

the panel having multiple spaced-apart openings,

a plurality of the multiple spaced-apart openings having a central crossmember extending from a first side of an opening to a second side thereof,

said plurality of openings in a pattern on the panel as viewed from above, and

a support for the panel and the at least two layers of screening material.

2. The screen of claim 1 wherein the vibratory separator is a shale shaker for use on a drilling rig.

3. The screen of claim 1 wherein the at least two layers of screening material includes a third layer,

the third layer below the second layer and made of a plurality of intersecting third wires,

each of a plurality of the first wires aligned with a corresponding third wire,

each of a plurality of the second wires aligned with a corresponding third wire.

4. The screen of claim 1 wherein the multiple spaced-apart openings include a plurality of openings with a regular hexagonal shape.

5. The screen of claim 1 wherein a side-to-side length across one of the regular hexagonal openings is 1.83 inches.

6. The screen of claim 1 wherein the plurality of the multiple spaced-apart openings includes a plurality of openings with an elongated hexagonal shape.

7. The screen of claim 6 wherein a side-to-side length across one of the elongated hexagonal openings is 2.19 inches.

8. The screen of claim 1 wherein the pattern includes high impact areas of the screen.

9. The screen of claim 8 wherein the high impact areas include a feed end of the screen, a central area of the screen adjacent the feed end, and two side areas of the screen each adjacent the feed end.

10. The screen of claim 1 wherein the support is a frame.

11. The screen of claim 10 wherein the support has two spaced-apart ends, each of the two spaced-apart ends having a shaped edge, the shaped edge having a shape corresponding to a shape of a portion of the multiple spaced-apart openings.

12. The screen of claim 11 wherein the shaped edges block flow through the at least two layers of screening material.

13. A screen for a vibratory separator, the screen comprising

at least two layers of screening material,

the at least two layers of screening material including a first layer and a second layer, the first layer made of a plurality of intersecting first wires, the second layer made of a plurality of intersecting second wires, the first layer above the second layer,

each of a plurality of the first wires aligned with a corresponding second wire according to a preselected wire count ratio,

a panel combined with the at least two layers of screening material,

the panel having multiple spaced-apart openings,

a plurality of the multiple spaced-apart openings having a central crossmember extending from a first side of an opening to a second side thereof,

said plurality of openings in a pattern on the panel as viewed from above,

a support for the panel and the at least two layers of screening material,

wherein the at least two layers of screening material includes a third layer,

the third layer below the second layer and made of a plurality of intersecting third wires,

each of a plurality of the first wires aligned with a corresponding third wire,

each of a plurality of the second wires aligned with a corresponding third wire, and

wherein the pattern includes high impact areas of the screen.

14. A screen for a vibratory separator, the screen comprising

at least two layers of screening material,

the at least two layers of screening material including a first layer and a second layer, the first layer made of a plurality of intersecting first wires, the second layer made of a plurality of intersecting second wires, the first layer above the second layer,

the first layer having a warp-to-shute wire count ratio A between 0.9 and 1.1,

a wire count ratio B in a first direction between the first layer and the second layer is between 1 to 1.25 and 1 to 1.75, and

a wire count ratio C in a second direction different than the first direction between the top layer and the second layer is between 2.25 and 2.75.

15. The screen of claim 14 wherein

the ratio A is 1:

1,

the ratio B is 1;

1.5, and

the ratio C is 2.5.

16. The screen of claim 14 wherein wires in the first layer range in diameter in inches between 0.0011 and 0.0055,

wires in the second layer range in diameter in inches between 0.0011 and 0.0055, and

a ratio of diameters of wires of the first layer to diameters of wires in the second layer ranges between 0.72 and 0.68.

17. The screen of claim 14 wherein the first layer and the second layer are calendared together.

18. The screen of claim 14 wherein the vibratory separator is a shale shaker for use on a drilling rig.

19. The screen of claim 14 wherein the at least two layers of screening material includes a third layer of screening material.