Hydraulic port collar

1. A method for performing an operation in a wellbore, the method comprising:

a) providing a casing in the wellbore, the casing and wellbore defining an annulus therebetween;

b) including in the casing a hydraulic port collar, the hydraulic port collar including:

a housing, the housing including a housing inner surface, the housing inner surface defining a port collar bore that extends through the housing, the housing further including one or more housing ports extending between the port collar bore and the annulus;

a sliding sleeve disposed within the port collar bore, the sliding sleeve having a sliding sleeve inner surface and a sliding sleeve outer surface, wherein the housing inner surface and the sliding sleeve outer surface define an accumulator therebetween, the accumulator being in fluid communication with the annulus through a relief port that extends through the housing, the sliding sleeve being actuable between a first position in which fluid communication between the port collar bore and the annulus via the housing ports is blocked and a second position in which fluid communication between the port collar bore and the annulus via the housing ports is allowed; and

a landing seat, the landing seat abutting the sliding sleeve inner surface;

c) increasing fluid pressure within the port collar above the fluid pressure in the annulus so as to shift the sliding sleeve from the first position to the second position by allowing fluid to exit the accumulator via the relief port;

d) pumping a ball, dart, or plug through the wellbore into engagement with the landing seat; and

e) increasing the pressure in the port collar bore above the ball, dart, or plug so as to shift the sliding sleeve from the second position to the first position.

2. The method of claim 1 , further including the step of:

f) at least partially dissolving at least one of the landing seat and the ball, dart, or plug after step d).

3. The method of claim 1 wherein the hydraulic port collar further includes a shearable device that prevents movement of the sliding sleeve relative to the housing, and wherein step c) includes shearing the shearable device.

4. The method of claim 1 wherein the housing ports are downhole of the sliding sleeve when the sliding sleeve is in the second position.

5. The method of claim 1 , further including performing a primary cement job before step c).

6. The method of claim 1 , further including performing a secondary cement job after step c) and before step d), wherein performing the secondary cement job includes pumping cement through one or more housing ports.

7. The method of claim 1 wherein the hydraulic port collar further includes a contingency opening seat, wherein the landing seat has a central opening therethrough and the contingency opening seat has a central opening therethrough, and wherein the diameter of the central opening of the contingency opening seat is smaller than the diameter of the central opening of the landing seat.

8. The method of claim 1 , further including the step of:

f) fragmenting the landing seat after step d).

9. A hydraulic port collar for use in a wellbore, comprising:

a housing comprising an upper housing section and a lower housing section, the housing including a housing inner surface and a housing outer surface, the housing outer surface and the wellbore defining an annulus therebetween, the housing inner surface defining an axial port collar bore, the housing further including one or more housing ports extending between the port collar bore and the annulus;

a sliding sleeve disposed within the port collar bore, the sliding sleeve having a sliding sleeve inner surface and a sliding sleeve outer surface, wherein the housing inner surface and the sliding sleeve outer surface define an accumulator therebetween, the accumulator being in fluid communication with the annulus through a relief port that extends through the housing, the sliding sleeve being actuable between a first position in which fluid communication between the port collar bore and the annulus via the housing ports is blocked and a second position in which fluid communication between the port collar bore and the annulus via the housing ports is allowed, wherein the first position is closer than the second position to the lower housing section; and

a landing seat, the landing seat abutting the sliding sleeve inner surface, the landing seat having a diameter less than the diameter of the port collar bore;

wherein the sliding sleeve is actuable from the first position to the second position by a pressure differential between the port collar bore and the accumulator; and

wherein the sliding sleeve is actuable from the second position to the first position by an application of force to the landing seat.

10. The hydraulic port collar of claim 9 wherein the housing ports are downhole of the sliding sleeve when the sliding sleeve is in the second position.

11. The hydraulic port collar of claim 9 wherein the landing seat is dissolvable.

12. The hydraulic port collar of claim 9 wherein the landing seat is fragmentable.

13. The hydraulic port collar of claim 9 , further including a shearable device that prevents movement of the sliding sleeve relative to the housing.

14. The hydraulic port collar of claim 9 wherein the hydraulic port collar further includes a contingency opening seat, wherein the landing seat has a central opening therethrough and the contingency opening seat has a central opening therethrough, and wherein the diameter of the central opening of the contingency opening seat is smaller than the diameter of the central opening of the landing seat.

15. The hydraulic port collar of claim 9 wherein actuation of the sliding sleeve from the first position to the second position causes fluid to exit the accumulator via the relief port.

16. The hydraulic port collar of claim 9 , further including a locking assembly disposed between the sliding sleeve outer surface and the housing inner surface.

17. A hydraulic port collar for use in a wellbore, comprising:

a housing comprising an upper housing section and a lower housing section, the housing including a housing inner surface and a housing outer surface, the housing outer surface and the wellbore defining an annulus therebetween, the housing inner surface defining an axial port collar bore, the housing further including one or more housing ports extending between the port collar bore and the annulus;

a sliding sleeve disposed within the port collar bore, the sliding sleeve having a sliding sleeve inner surface and a sliding sleeve outer surface, wherein the housing inner surface and the sliding sleeve outer surface define an accumulator therebetween, the accumulator being in fluid communication with the annulus through a relief port that extends through the housing, the sliding sleeve being actuable between a first position in which fluid communication between the port collar bore and the annulus via the housing ports is blocked and a second position in which fluid communication between the port collar bore and the annulus via the housing ports is allowed, wherein the first position is closer than the second position to the lower housing section; and

a landing seat, the landing seat abutting the sliding sleeve inner surface, the landing seat having a diameter less than the diameter of the port collar bore;

wherein the sliding sleeve is actuable from the first position to the second position by a pressure differential between the port collar bore and the accumulator;

wherein the sliding sleeve is actuable from the second position to the first position by an application of force to the landing seat;

wherein the housing ports are downhole of the sliding sleeve when the sliding sleeve is in the second position; and

wherein the hydraulic port collar further includes a contingency opening seat, wherein the landing seat has a central opening therethrough and the contingency opening seat has a central opening therethrough, and wherein the diameter of the central opening of the contingency opening seat is smaller than the diameter of the central opening of the landing seat.

18. The hydraulic port collar of claim 17 wherein the landing seat is dissolvable.

19. The hydraulic port collar of claim 17 wherein the landing seat is fragmentable.