Downhole assembly with debris relief, and method for using same

1. An assembly for treating an interval of a wellbore, comprising:

a fluid jet perforation device, deployed on a tubing string;

a resettable sealing device deployed on the tubing string in fluid communication with the fluid jet perforation device;

the sealing device including a J-profile with a pin slidably-disposed in said J-profile for use in actuation of the sealing device

wherein the J-profile comprises one or more debris discharge ports through the J-profile.

2. The assembly of claim 1 further comprising:

a mechanical casing collar locator having outwardly biased locating members.

3. The assembly of claim 2 wherein the mechanical casing collar locator comprises a cavity beneath the outwardly biased locating members.

4. The assembly of claim 1 wherein the pin is actuated by application of mechanical force to the tubing string.

5. The assembly of claim 1 wherein the J-profile is sized at least 1/16 inch greater than a diameter of the pin.

6. The assembly of claim 1 wherein the pin is held to the assembly by a clutch ring, and wherein the clutch ring comprises:

a debris relief passageway sized and configured to permit discharge of debris from about the pin while the pin slides within the J-profile.

7. The assembly of claim 1 further comprising:

an equalization valve located above the resettable sealing device.

8. The assembly of claim 7 wherein the equalization valve comprises:

an equalization valve plug slidably disposed within an equalization valve housing, said equalization valve plug operatively coupled to the pin of the J-profile of the resettable sealing device.

9. The assembly of claim 8 wherein the equalization plug is slidably actuated by application of mechanical force to the tubing string.

10. The assembly of 1 wherein the fluid jet perforation device is assembled above the resettable sealing device.

11. A method for abrasive perforation and treatment of a formation intersected by a cased wellbore, the method comprising the steps of:

providing a tool assembly comprising

a fluid jet perforation device, and

a sealing device comprising a J-profile with a pin for use in actuation of the sealing device;

deploying the tool assembly on a tubing string within the cased wellbore;

setting the sealing device against the cased wellbore;

while the sealing device is set against the cased wellbore delivering abrasive fluid to the tubing string;

jetting abrasive fluid from the fluid jet perforation device to perforate the cased wellbore for forming one or more perforations;

while the sealing device remains set against the cased wellbore, circulating treatment fluid down an annulus formed by the cased wellbore to treat the one or more perforations;

then delivering the treatment fluid down the annulus;

circulating the treatment fluid from the annulus; and

unsetting the sealing device from the cased wellbore.

12. The method of claim 11 further comprising actuating the sealing device by application of mechanical force to the tubing string.

13. The method of claim 11 wherein the abrasive fluid comprises sand.

14. The method of claim 11 wherein the treatment fluid comprises flowable solids.

15. The method of claim 11 further comprising the step of:

equalizing pressure above and below the sealing device by applying a force to the tubing string to actuate said equalization valve.

16. The method of claim 11 further comprising the step of:

equalizing pressure between the tubing string and the annulus without unsetting the sealing device from the cased wellbore.

17. The method of claim 11 further comprising the step of:

moving the tool assembly to another interval within the wellbore and repeating one or more of the steps recited in claim 11 .

18. The method of claim 11 further comprising the step of:

providing an equalization valve between the fluid jet perforation device and the sealing device.

19. The method of claim 11 wherein flow is directed from the annulus into the tubing string through a debris relief passageway.

20. An assembly deployed on a tubing string, for treating an interval of a wellbore, comprising:

a fluid jet perforation device;

a resettable sealing device;

the sealing device including a J-profile with a pin slidably-disposed in said J-profile for use in actuation of the sealing device

wherein the pin is held to the assembly by a clutch ring, and wherein the clutch ring comprises

a debris relief passageway to permit discharge of the debris from about the pin while the pin slides within the J-profile.