Patent ID: 6772835
Filing Date: 2004-08-10
Classification: E21B

Abstract:
A downhole tool for attaching to a workstring in a wellbore, the downhole tool comprising:a first section defining a first bore in communication with the workstring; a second section defining a second bore; a collet coupled to the second section and adapted to contract radially from a first radial position to a second radial position, wherein in the first radial position the collet is adapted to couple to the first section, and wherein in the second radial position the collet does not couple to the first section; a support mechanism slidably coupled to the collet and adapted to radially support the collet to prevent the collet from radially contracting from the first radial position to the second radial position; a sleeve disposed within the first section and adapted to slidably move and exert a pressure on an end of the support mechanism; a positioning mechanism coupled to the support mechanism for keeping the support mechanism in a position such that the support mechanism prevents the collet from radially contracting from the first radial position until a predetermined condition occurs, wherein a predetermined axial force placed on the support mechanism can shear the positioning mechanism, thus allowing the support mechanism to move such that the collet radially contracts from the first radial position to the second radial position; and a fluid releasing device adapted to selectively place the first bore in communication with the wellbore so that fluid contained in the workstring can either be retained in the workstring or released into the wellbore after the first section is uncoupled from the second section.