Abstract: A hydraulic overshot apparatus designed to slide over plain end tubing and set by applying hydraulic fluid, under pressure, via a hydraulic setting port, into a center chamber which allows pressure to direct to two different piston areas. The setting piston compresses packer elements and tubing slips against the outer diameter (O.D.) of the tubing. The test piston compresses tubing test elements against the inner diameter (I.D.) of the tubing. The setting pressure is ported through the upper setting and test portion to allow pressure to move from the center chamber to the lower outer portion. The lower outer portion includes a body lock ring and a setting piston for setting the packer elements. Setting pressure moves the setting piston down through the body lock ring. As the setting piston moves down, it ratchets down through the body lock ring.

Abstract: A hydraulic overshot apparatus designed to slide over plain end tubing and set by applying hydraulic fluid, under pressure, via a hydraulic setting port, into a center chamber which allows pressure to direct to two different piston areas. The setting piston compresses packer elements and tubing slips against the outer diameter (O.D.) of the tubing. The test piston compresses tubing test elements against the inner diameter (I.D.) of the tubing. The setting pressure is ported through the upper setting and test portion o allow pressure to move from the center chamber to the lower outer portion. The lower outer portion includes a body lock ring and a setting piston for setting the packer elements. Setting pressure moves the setting piston down through the body lock ring. As the setting piston moves down, it ratchets down through the body lock ring.

Abstract: A valve apparatus. The valve apparatus is disposed within a well so that an annulus is formed between an outer portion of the valve and an inner portion of the well. In one preferred embodiment, the valve apparatus comprises an outer mandrel containing an annulus port; an inner mandrel slidably disposed within the outer mandrel, and wherein the inner mandrel contains a production and equalizing port. The valve contains a seal assembly so that pressure from the annulus is isolated from the inner portion of the inner mandrel. In one preferred embodiment, the seal assembly comprises: a first header seal; a first seal ring, abutting the header seal, for sealing with the outer portion of the inner mandrel; a follower seal abutting the seal ring; a second seal ring, abutting the follower seal, for sealing with the outer portion of the inner mandrel; a second header seal; and an equalizing seal abutting the second seal ring.

Abstract: A valve apparatus. The valve apparatus is disposed within a well so that an annulus is formed between an outer portion of the valve and an inner portion of the well. In one preferred embodiment, the valve apparatus comprises an outer mandrel containing an annulus port; an inner mandrel slidably disposed within the outer mandrel, and wherein the inner mandrel contains a production and equalizing port. The valve contains a seal assembly so that pressure from the annulus is isolated from the inner portion of the inner mandrel. In one preferred embodiment, the seal assembly comprises: a first header seal; a first seal ring, abutting the header seal, for sealing with the outer portion of the inner mandrel; a follower seal abutting the seal ring; a second seal ring, abutting the follower seal, for sealing with the outer portion of the inner mandrel; a second header seal; and an equalizing seal abutting the second seal ring.