Retrieving tool for wellhead packing

A retrieving tool for pulling a packing and locking apparatus from the annular space between a wellhead and a casing hanger in the wellhead, said packing and locking apparatus having a pulling shoulder facing downwardly, said tool comprising:

• a body having means connectable to an operating pipe string for lowering said body and pulling upwardly on said body, latch means carried by said body including circumferentially spaced flexible fingers having latch lugs projecting therefrom and engageable with said pulling shoulder, and fluid passage means in said body leading from said pipe string to the vicinity of said fingers for conducting washing fluid to the vicinity of said packing and locking apparatus, including fluid pressure operated actuator means for flexing said fingers from latching relation with said pulling shoulder, said fluid pressure operated actuator means including a sleeve shiftably mounted on said body, said body and said sleeve having means defining a piston chamber, a piston on said sleeve exposed to the pressure of fluid in said piston chamber, and passage means leading from said pipe string to said piston chamber.

A retrieving tool for pulling a packing and locking apparatus from the annular space between a wellhead and a casing hanger in the wellhead, said packing and locking apparatus having a pulling shoulder facing downwardly, said tool comprising:

• a body having means connectable to an operating pipe string for lowering said body and pulling upwardly on said body, latch means carried by said body including circumferentially spaced flexible fingers having latch lugs projecting therefrom and engageable with said pulling shoulder, and fluid passage means in said body leading from said pipe string to the vicinity of said fingers for conducting washing fluid to the vicinity of said packing and locking apparatus, wherein said fingers have lugs projecting therefrom, an actuator sleeve having a surface adjacent to said lugs, said body and said sleeve having means including a piston on said sleeve forming a piston chamber, and passage means leading to said piston chamber from said pipe string to conduct pressure fluid to said piston chamber for shifting said sleeve relative to said fingers, whereby said surface on said sleeve cams said fingers from latching relation with said pulling shoulder.

A retrieving tool for pulling a packing and locking apparatus from the annular space between a wellhead and a casing hanger in the wellhead, said packing and locking apparatus having a pulling shoulder facing downwardly, said tool comprising:

• a body having means connectable to an operating pipe string for lowering said body and pulling upwardly on said body, said body having an annular groove, latch means including a circumferentially continuous ring disposed in said groove, flexible fingers integral with and extending downwardly from said ring, a retainer carried by said body and holding said ring in said groove, and latch lugs on said fingers engageable with said pulling shoulder upon downward movement of said body into engagement with said packing and locking apparatus.

A retrieving tool for pulling packing and locking apparatus from the annular space between a wellhead and a casing hanger in the wellhead, said packing and locking apparatus having a pulling shoulder facing downwardly, said tool comprising:

• a body having means connectable to an operating pipe string for lowering said body and pulling upwardly on said body, latch means carried by said body including a plurality of flexible latch fingers extending downwardly from said body and having lugs engageable with said pulling shoulder upon downward movement of said body into engagement with said packing and locking apparatus, said fingers having cam surfaces spaced above said lugs, an actuator sleeve shiftable in said body and having a surface engageable with said cam surfaces, upon downward movement of said sleeve with respect to said body and fingers, to flex said lugs from latching relation with said pulling shoulder, and fluid pressure operated means for shifting said actuator sleeve downwardly of said body and fingers.

A retrieving tool for pulling a packing and locking apparatus from the annular space between a wellhead and a casing hanger in the wellhead, said packing and locking apparatus having a pulling shoulder facing downwardly, said tool comprising:

• a body having means connectable to an operating pipe string for lowering said body and pulling upwardly on said body, latch means carried by said body including a plurality of flexible latch fingers extending downwardly from said body and having lugs engageable with said pulling shoulder upon downward movement of said body into engagement with said packing and locking apparatus, said fingers having cam surfaces spaced above said lugs, an actuator sleeve shiftable in said body and having a surface engageable with said cam surfaces to flex said lugs from latching relation with said pulling shoulder, and fluid pressure operated means for shifting said actuator sleeve including a piston on said sleeve, said sleeve, said piston and said body having portions defining a piston chamber, and passage means leading through said body to said piston chamber from said pipe string.