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A well tool having reciprocating portions can be locked in a predetermined position by a latching mechanism which is responsive to externally applied pressure, as opposed to mere movement of the reciprocating elements to the predetermined position. The actuating pressure can be applied through the a

A well tool having reciprocating portions can be locked in a predetermined position by a latching mechanism which is responsive to externally applied pressure, as opposed to mere movement of the reciprocating elements to the predetermined position. The actuating pressure can be applied through the annulus or through a pipe string in which the tool is located.

대표청구항 ▼

A tester tool for controlling fluid flow through a pipe string disposed in a well comprising: a first valve housing portion having a first engagement shoulder defined therein; a second valve housing portion having a second engagement shoulder defined therein, said second valve housing portion slidab

A tester tool for controlling fluid flow through a pipe string disposed in a well comprising: a first valve housing portion having a first engagement shoulder defined therein; a second valve housing portion having a second engagement shoulder defined therein, said second valve housing portion slidably connected with said first valve housing portion; a valve member movably retained within said first and second housing portions; and latch means, slidably disposed adjacent said first and second housing portions, for moving, in response to an applied pressure, between an unlatched position, wherein said first and second housing portions can move relative to each other, and a latched position, wherein said first and second housing portions are latched to prevent relative movement, said latch means having third and fourth engagement shoulders defined therein for engaging said first and second engagement shoulders when said latch means is moved by the applied pressure to said latched position, wherein said latch means includes: a slide member having a surface defining said fourth engagement shoulder; a locking dog having a surface defining said third engagement shoulder; and retainer means for retaining said locking dog with said slide member so that said locking dog is moved by said slide member.