Downhole tool

Details Downhole tool Downhole tool

1997-04-22

1999-09-07

Neuder, William

Wells

With electrical means

Electrical motor

166377, D21B 2304

Patent

active

059471980

ABSTRACT:
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).

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