초록 ▼

A downhole tool (12) connected to the lower end of a coiled tubing string (14). A wireline cable (16) extends downwardly through the coiled tubing string (14) and through the center of the tool (12) to define an annulus between the cable (16) and the outer housing (66). Annular valves (98, 100) cont

A downhole tool (12) connected to the lower end of a coiled tubing string (14). A wireline cable (16) extends downwardly through the coiled tubing string (14) and through the center of the tool (12) to define an annulus between the cable (16) and the outer housing (66). Annular valves (98, 100) control annulus fluid flow. A clamping device (26) releasably secures the wireline cable (16). The disconnect for the downhole tool (12) comprises an electrically activated fluid pressure mechanism for releasing disconnect dogs or latches (116, FIG. 1H) carried by an upper tool portion (12A) and releasably securing a lower tool portion (12B). The fluid actuated mechanism is activated by an electrical solenoid valve (124) to permit actuation of a disconnect piston (148) by communicating pressurized hydraulic fluid in a reservoir (168) through fluid passages 170, 158 to a piston fluid chamber (156). Upon a predetermined fluid pressure provided between internal fluid in the tool and external fluid in the well, piston (148) moves downwardly to contact and move retainer sleeve (140) downwardly to permit the locking dogs (116) to retract within the recess (144) of retainer sleeve (140) as shown in FIG. 4B to release upper tool portion (12A) from lower tool portion (12B).

대표청구항 ▼

[ What is claimed is:] [1.] In a downhole tool disconnect system for a well having a tubing string extending downhole and a tool connected to the tubing string, the tool having a disconnect joint between an upper tool portion connected to a lower end of the tubing string and a lower tool portion rel

[ What is claimed is:] [1.] In a downhole tool disconnect system for a well having a tubing string extending downhole and a tool connected to the tubing string, the tool having a disconnect joint between an upper tool portion connected to a lower end of the tubing string and a lower tool portion releasably connected to said upper tool portion; an improved release mechanism for said release joint comprising:releasable locking means for releasably connecting said lower tool portion to said upper tool portion adjacent said disconnect joint;fluid operated release means operatively connected to said releasable locking means for unlocking of said locking means upon activation of said fluid operated release means and subsequent actuation of said release means; andelectrical means operatively connected to said fluid operated release means to provide an electrical signal to said fluid operated release means to activate said fluid operated release means and permit actuation thereof upon a predetermined fluid pressure differential between an internal fluid in the tubing string and external fluid in the well.