System, assembly and method for port control

1. A port control system comprising:

a group of port control assemblies at least one of which delaying passage of a first plug and at least one of which preventing passage of the first plug, each assembly of the group configured to shift a first sleeve from a first position to a second position to open one or more ports responsive to contact with the first plug upon fluid pressure differential across the first plug; the first sleeve shifting in a direction that is along a direction of movement of the first plug and expanding radially toward a housing of the port control system to reach the second position to open the one or more ports; and

at least one second group of port control assemblies at least one of which delaying passage of a second plug and at least one of which preventing passage of the second plug, each assembly of the group configured to shift a second sleeve to open one or more ports responsive to contact with the second plug upon fluid pressure differential across the second plug.

2. A port control system as claimed in claim 1 wherein each assembly delaying passage of a plug comprises:

a housing having one or more ports and a recess;

a member disposed radially of the housing; and

a hold and release component associated with the member and alignable with the recess upon differential pressure across a plug seated in the hold and release component during use.

3. A port control system as claimed in claim 2 wherein the assembly further includes a release member initially maintaining the member in a position associated with the one or more ports being closed.

4. A port control system as claimed in claim 3 wherein the release member is responsive to a load placed thereon and caused by a pressure differential across one of the plugs during use.

5. A port control system as claimed in claim 4 wherein the release member is one or more shear screws.

6. A port control system as claimed in claim 2 wherein the hold and release component is a collet.

7. A port control system as claimed in claim 2 wherein the hold and release component is one or more dogs.

8. A port control system as claimed in claim 2 wherein the hold and release component is a C-ring.

9. A port control system comprising:

a group of port control assemblies at least one of which delaying passage of a plug and at least one of which preventing passage of the plug, each assembly of the group configured to shift a member to open one or more ports responsive to contact with a same sized plug upon fluid pressure differential across the plug, shifting the sleeve to open the one or more ports including shifting the sleeve from a first position to a second position, shifting the sleeve in a direction that is along a direction of movement of the plug and expanding radially toward a housing of the group.

10. A port control system as claimed in claim 9 wherein each assembly delaying passage of a plug comprises:

a housing having one or more ports and a recess;

a member disposed radially of the housing; and

a hold and release component associated with the member and alignable with the recess upon differential pressure across a plug seated in the hold and release component during use.

11. A port control system as claimed in claim 10 wherein the assembly further includes a release member initially maintaining the member in a position associated with the one or more ports being closed.

12. A port control system as claimed in claim 11 wherein the release member is responsive to a load placed thereon and caused by a pressure differential across a plug during use.

13. A port control system as claimed in claim 10 wherein the hold and release component is a collet.

14. A port control system as claimed in claim 10 wherein the hold and release component is one or more dogs.

15. A port control system as claimed in claim 10 wherein the hold and release component is a C-ring.