3D printed flapper valve

1. A subsurface tool comprising:

a tubular valve housing having a valve chamber, the housing being configured to connect to a bottom sub connector; and

a flapper closure plate having an integrally formed body, the flapper closure plate comprising:

an internal void located within the body of the flapper closure plate, and

an indentation extending from an exterior surface of the body of the flapper closure plate, the indentation having an opening defining a first dimension along a first direction at the exterior surface of the body, the indentation defining an indentation surface extending within the body, the indentation surface defining a second dimension along the first direction within the body, the second dimension being greater than the first dimension;

wherein the flapper closure plate is solid in a thickness direction at a position interior to the indentation.

2. The subsurface tool of claim 1 , further comprising:

a valve seat mounted within the housing having a valve seat sealing surface, the valve seat defining a flow passage therethrough; and

wherein the flapper closure plate is rotatably disposed within the valve chamber and is rotatable between a valve open position in which the flapper closure plate is removed from the valve seat and a valve closed position in which a sealing surface of the flapper closure plate sealingly engages the valve seat sealing surface for preventing flow through the flow passage.

3. The subsurface tool of claim 1 , wherein the internal void is one of a plurality of internal voids.

4. The subsurface tool of claim 3 , wherein the plurality of internal voids form a void array.

5. The subsurface tool of claim 2 ,

wherein the indentation is a channel formed within a circumference of the sealing surface of the flapper closure plate.

6. The subsurface tool of claim 5 , wherein the channel is a keystone shaped channel.

7. The subsurface tool of claim 2 ,

wherein the indentation is a channel formed within a circumference of the sealing surface of the flapper closure plate; and

further comprising an elastomeric seal accommodated within the channel.

8. The subsurface tool of claim 7 ,

wherein the sealing surface of the flapper closure plate forms a convex spherical segment having radius of curvature; and

wherein the valve seat sealing surface forms a concave spherical segment having a radius of curvature that is substantially matched with the radius of curvature of the convex spherical segment of the flapper closure plate to permit nesting engagement of the convex spherical segment of the flapper closure plate and the elastomeric seal against the concave spherical segment of the valve seat.

9. The subsurface tool of claim 2 , wherein the flapper closure plate further comprises a protrusion located along the sealing surface of the flapper closure plate.

10. The subsurface tool of claim 2 ,

wherein the flapper closure plate further comprises a protrusion located along the sealing surface of the flapper closure plate;

wherein the sealing surface of the flapper closure plate forms a convex spherical segment having radius of curvature; and

wherein the valve seat sealing surface forms a concave spherical segment having a radius of curvature that is substantially matched with the radius of curvature of the convex spherical segment of the flapper closure plate to permit nesting engagement of the convex spherical segment of the flapper closure plate and the protrusion against the concave spherical segment of the valve seat.

11. The subsurface tool of claim 1 , wherein the flapper closure plate is at least partially manufactured using an additive manufacturing process.

12. An apparatus comprising:

a non-transitory computer readable medium; and

a plurality of instructions stored on the non-transitory computer readable medium and executable by one or more processors, the plurality of instructions comprising:

instructions that cause the manufacture of a flapper closure plate that has an integrally formed body, the flapper closure plate comprising at least one of:

an internal void located within a body of the flapper closure plate; and

an indentation extending from an exterior surface of the body of the flapper closure plate, the indentation having an opening defining a first dimension along a first direction at the exterior surface of the body, the indentation defining an indentation surface extending within the body, the indentation surface defining a second dimension along the first direction within the body, the second dimension being greater than the first dimension;

wherein, when the one or more processors execute the plurality of instructions, the flapper closure plate is manufactured.

13. The apparatus of claim 12 , wherein the flapper closure plate comprises the internal void and the internal void is one of a plurality of internal voids that form a void array.

14. The apparatus of claim 12 ,

wherein the flapper closure plate comprises the indentation; and

wherein the indentation is a channel formed within a circumference of a sealing surface of the flapper closure plate.

15. A method for controlling flow of a fluid in a wellbore system, the method comprising:

providing a flapper valve assembly comprising:

a tubular valve housing having a valve chamber;

a valve seat mounted within the housing having a valve seat sealing surface, the valve seat defining a flow passage therethrough; and

a flapper closure plate that is rotatably disposed within the valve chamber and that is rotatable between a valve open position in which the flapper closure plate is removed from the valve seat and a valve closed position in which a sealing surface of the flapper closure plate sealingly engages the valve seat sealing surface for preventing flow through the flow passage; and

allowing flow of the fluid in the wellbore system when the flapper closure plate is in the open position;

wherein the flapper closure plate has an integrally formed body, the flapper closure plate comprising:

an internal void located within the body of the flapper closure plate, and

an indentation extending from an exterior surface of the body of the flapper closure plate, the indentation having an opening defining a first dimension along a first direction at the exterior surface of the body, the indentation defining an indentation surface extending within the body, the indentation surface defining a second dimension along the first direction within the body, the second dimension being greater than the first dimension; and

wherein the flapper closure plate is solid in a thickness direction at a position interior to the indentation.

16. The method of claim 15 , wherein the internal void is one of a plurality of internal voids that form a void array.

17. The method of claim 15 ,

wherein the indentation is a channel formed within a circumference of the sealing surface of the flapper closure plate.

18. The method of claim 15 , wherein the flapper closure plate is at least partially manufactured using an additive manufacturing process.

19. The subsurface tool of claim 1 , wherein the internal void does not penetrate an exterior surface of the body of the flapper closure plate.

20. The method of claim 15 , wherein the internal void does not penetrate an exterior surface of the body of the flapper closure plate.

21. The subsurface tool of claim 1 , further comprising a plurality of internal voids within the body of the flapper closure plate, wherein a density of the voids within the body is gradated.