Patent ID: 8522886

Claim:
A downhole apparatus adapted to be run into a wellbore, the apparatus comprising: a body adapted to connect with a wireline and an anchor in a wellbore; one or more ports provided in the body for passage of fluid between regions of the well bore above and below the apparatus and the anchor; a valve member movable relative to the body between a first position in which the ports are open to allow fluid flow there through, and a second position in which the ports are closed to prevent fluid flow therethrough; wherein the valve member is connected to a drive shaft of a gearbox and motor assembly to thereby be rotated with respect to the body between the first and second positions; wherein the valve member includes at least one aperture, and the valve member is operable to be rotated relative to the body to selectively allow fluid flow of fluid between regions of the wellbore above and below the apparatus and the anchor, wherein fluid flow between regions of the wellbore above and below the apparatus is allowed when the port and the aperture are aligned and fluid flow between regions of the wellbore above and below the apparatus is cut off when the port and the aperture are misaligned; wherein the apparatus includes a seal arrangement for sealing the one or more ports when the valve member is in its second position; wherein the seal arrangement includes a sealing element providing a metal-to-metal seal around the one or more ports, wherein the seal arrangement provides a double piston effect metal-to-metal seal such that the seal arrangement functions as a seal regardless of direction of pressure differential across the seal, and the sealing element is a metal seal ring which is radially moveable with respect to the valve member; and wherein the valve member includes a part spherical surface locatable on a complementary surface of the seal arrangement.