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In servicing a wellbore having casing cemented therein, an assembly deploys on tubing (coiled tubing or jointed pipe) downhole. Fluid is circulated down the tubing to the assembly, and a perforating gun on the assembly passes the circulated fluid through it. A tool downhole on the assembly is then o

In servicing a wellbore having casing cemented therein, an assembly deploys on tubing (coiled tubing or jointed pipe) downhole. Fluid is circulated down the tubing to the assembly, and a perforating gun on the assembly passes the circulated fluid through it. A tool downhole on the assembly is then operated with the circulated fluid passed through the perforating gun. For example, the tool can include a fluid-operated motor and milling tool. To allow the fluid to flow through the gun, an outer housing supports the load between the tubing and operable tool and has an inner flow tube disposed therein. Charges for perforating are supported in the space between the housing and flow tube. Once cleanup or other service is done with the tool, a detonation is initiated for the perforating the casing with one or more charges of the perforating gun. The detonation can be initiated by a deployed device or ball shifting a sleeve to drive a pin into a detonator. Detonating cord can connect the detonation to the charges.

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1. An assembly deployed on tubing to service and perforate casing downhole in a wellbore, the assembly comprising: a perforating gun coupled to the tubing and having a flow passage therethrough communicating fluid from the tubing;a firing mechanism defining a bore in fluid communication with the tub

1. An assembly deployed on tubing to service and perforate casing downhole in a wellbore, the assembly comprising: a perforating gun coupled to the tubing and having a flow passage therethrough communicating fluid from the tubing;a firing mechanism defining a bore in fluid communication with the tubing, the firing mechanism defining a circulating port communicating with the bore, the firing mechanism comprising a sleeve movably disposed in the bore in response to an activation from fluid pressure communicated against a deployed device engaged in a seat of the sleeve, the sleeve being movable relative to the circulating port to control fluid communication of the bore with the circulating port, the moved sleeve driving a pin into a detonator and initiating a detonation in response thereto;one or more charges disposed on the perforating gun, the one or more charges being exploded to perforate the casing in response to the detonation; anda tool coupled downhole from the perforating gun and being operable with the fluid communicated from the tubing through the flow passage of the perforating gun. 2. The assembly of claim 1, wherein the tool comprises a well isolation device coupled downhole from the perforating gun and being operable with the communicated fluid to isolate a portion of the wellbore. 3. The assembly of claim 1, wherein the tool comprises a motor coupled downhole from the perforating gun and being operable with the communicated fluid. 4. The assembly of claim 1, wherein the tool comprises a milling tool coupled downhole from the perforating gun and being operable with the communicated fluid. 5. The assembly of claim 1, wherein the firing mechanism comprises a first ballistic transfer coupled to the detonator with a first detonating cord and disposed at a first connection of the firing mechanism to the perforating gun, the first ballistic transfer transferring the detonation across the first connection. 6. The assembly of claim 5, wherein the first ballistic transfer comprises a detonating booster coupled to the first detonating cord and disposed at the first connection. 7. The assembly of claim 6, wherein the detonating booster comprises a disc of booster material disposed about a seal face at the first connection between the firing mechanism and the outer housing. 8. The assembly of claim 5, wherein the perforating gun comprises a second ballistic transfer receiving the detonation across the first connection and comprises a second detonating cord extending from the second ballistic transfer and communicating the detonation to the one or more charges. 9. The assembly of claim 8, wherein the second ballistic transfer comprises a detonating booster coupled to the second detonating cord and disposed at the first connection. 10. The assembly of claim 8, wherein the perforating gun comprises more than one section coupled longitudinally together at second connections, each section having a portion of the flow passage, each section having first and second ballistic transfers transferring the detonation across the second connections. 11. The assembly of claim 1, wherein the perforating gun comprises an outer housing having at least one flow tube disposed therein for the flow passage communicating fluid from the tubing, the at least one flow tube in fluid communication with the bore of the firing mechanism. 12. The assembly of claim 11, wherein the one or more charges are disposed in an inner space between the outer housing and the at least one flow tube. 13. The assembly of claim 12, comprising an intermediate sleeve disposed in the inner space between the outer housing and the at least one flow tube and supporting the one or more charges. 14. The assembly claim 11, wherein the at least one flow tube comprises a first swedged seal toward the fluid communication from the tubing; and a second swedged seal toward the tool. 15. The assembly of claim 1, wherein the open circulating port allows flow around the tubing. 16. An assembly deployed on tubing to clean and perforate casing downhole in a wellbore, the assembly comprising: a housing defining an inner space and having first and second ends, the first end coupled to the tubing;at least one flow tube disposed in the inner space of the housing and communicating fluid from the tubing at the first end to the second end of the housing;a firing mechanism defining a bore in fluid communication with the tubing, the firing mechanism defining a circulating port communicating with the bore, the firing mechanism comprising a sleeve movably disposed in the bore in response to an activation from fluid pressure communicated against a deployed device engaged in a seat of the sleeve, the sleeve being movable relative to the circulating port to control fluid communication of the bore with the circulating port, the moved sleeve driving a pin into a detonator and initiating a detonation in response thereto;one or more charges disposed in the inner space between the housing and the at least one flow tube, the one or more charges being exploded in response to the detonation to perforate the casing; anda tool coupled toward the second end of the housing and in communication with the fluid from the at least one flow tube, the tool being operable with the communicated fluid. 17. A method of servicing a wellbore having casing cemented therein, the method comprising: deploying an assembly on tubing downhole in the casing of the wellbore;circulating fluid down the tubing to the assembly;passing the circulated fluid through a perforating gun on the assembly;operating a tool downhole on the assembly from the perforating gun with the circulated fluid passed through the perforating gun;activating a firing mechanism with a deployed device circulated down the tubing to the assembly, the firing mechanism defining a circulating port communicating with the bore, by moving a sleeve movably disposed in a bore of the firing mechanism with fluid pressure against the deployed device seated in the sleeve, the sleeve being movable relative to the circulating port to control fluid communication of the bore with the circulating port, and driving a pin with the movement of the sleeve into a detonator to initiate a detonation for the perforating gun; andperforating the casing with one or more charges of the perforating gun in response to the detonation. 18. The method of claim 17, wherein operating the tool comprises isolating a portion of the wellbore. 19. The method of claim 17, wherein operating the tool comprises operating a motor coupled downhole from the perforating gun. 20. The method of claim 17, wherein the operating the tool comprises milling with the operation of the tool. 21. The method of claim 17, wherein initiating the detonation for the perforating gun further comprises opening a circulating port to circulate the tubing with the wellbore. 22. The method of claim 17, wherein perforating the casing with the one or more charges of the perforating gun in response to the detonation comprises transferring the detonation across a connection of the perforating gun to the assembly with a ballistic transfer coupled to the detonator and communicating the transferred detonation to the one or more charges with at least one detonating cord. 23. The method of claim 17, wherein passing the circulated fluid through the perforating gun on the assembly comprising supporting the one or more charges in an inner space between an outer housing and at least one inner flow tube of the perforating gun. 24. The method of claim 23, wherein passing the circulated fluid through the perforating gun on the assembly comprises communicating the circulated fluid through the at least one inner flow tube having swaged seals on its ends communicating with the tubing and the tool. 25. The method of claim 17, comprising allowing flow around the tubing through the open circulating port.