Abstract: The present invention relates generally to offshore drilling and production operations, and, more particularly, to marine drilling workover/intervention tensioning and compensating devices and methodologies. A heave compensated hydraulic workover device and/or system is provided comprising a hydraulic tensioning cylinder system disposed beneath a rig floor and adapted to be connected at a mandrel to the rig floor through a rotary table disposed in the rig floor. The heave compensated hydraulic workover device and/or system also comprises a well intervention apparatus disposed at least partially within the hydraulic tensioning cylinder system beneath the rig floor, the well intervention apparatus capable of being used in conjunction with at least one of a well, a wellhead, a blow-out pressure system, a jointed tubular, a pipe, and a drilling string.

Abstract: The present invention relates generally to offshore drilling and production operations, and, more particularly, to marine drilling workover/intervention tensioning and compensating devices and methodologies. A heave compensated hydraulic workover device and/or system is provided comprising a hydraulic tensioning cylinder system disposed beneath a rig floor and adapted to be connected at a mandrel to the rig floor through a rotary table disposed in the rig floor. The heave compensated hydraulic workover device and/or system also comprises a well intervention apparatus disposed at least partially within the hydraulic tensioning cylinder system beneath the rig floor, the well intervention apparatus capable of being used in conjunction with at least one of a well, a wellhead, a blow-out pressure system, a jointed tubular, a pipe, and a drilling string.

Abstract: A tong system includes an upper tong having grips for gripping a tubular and a rotation mechanism to rotate the grips and the tubular. A lower tong also has grips and a rotation mechanism to rotate the grips to provide rotation to a lower tubular, such that the upper and lower tubulars may be made up/broken out from one another, also so that string of tubulars may be rotated for drilling purposes without requiring a rotary table. Also, an apparatus and method for circulating fluid through a tubular string has a first fluid conduit for supplying fluid to the bore of an upper tubular to be made up into or broken out from the tubular string and a second fluid conduit for supplying fluid to the bore of the tubular string, which allows continuous circulation of fluid to occur whilst running the string into/pulling the string from, a borehole and also whilst making up tubulars into/breaking out tubulars from the string.

Abstract: An apparatus for inserting or removing a string of tubulars from a borehole includes a makeup/break out mechanism which is capable of adding a tubular to or removing a tubular from the string and handling mechanism which feeds a tubular into, or removes a tubular from, the make up/break out mechanism. The make up/break out mechanism is moveable along the direction parallel to the axial direction of the string, such that the string may be substantially continuously inserted into or removed from the borehole.

Abstract: A method and apparatus for inserting or removing a string of tubulars from a subsea borehole. The apparatus includes a first, lower, gripping mechanism locatable subsea in the vicinity of the subsea borehole. The first gripping mechanism is capable of gripping a portion of the string of tubulars. The apparatus further includes a second, upper, gripping mechanism locatable subsea in the vicinity of the subsea borehole, the second gripping mechanism being capable of-gripping a portion of the sting of tubulars. The first and second gripping mechanisms are moveable with respect to one another. The apparatus further includes a movement mechanism which, when actuated, moves one of the first and second gripping mechanisms with respect to the other of the first and second gripping mechanisms, such that the string of tubulars is inserted into or removed from the subsea borehole.

Abstract: A tong system includes an upper tong having grips for gripping a tubular and a rotation mechanism to rotate the grips and the tubular. A lower tong also has grips and a rotation mechanism to rotate the grips to provide rotation to a lower tubular, such that the upper and lower tubulars may be made up/broken out from one another, also so that string of tubulars may be rotated for drilling purposes without requiring a rotary table. Also, an apparatus and method for circulating fluid through a tubular string has a first fluid conduit for supplying fluid to the bore of an upper tubular to be made up into or broken out from the tubular string and a second fluid conduit for supplying fluid to the bore of the tubular string, which allows continuous circulation of fluid to occur whilst running the string into/pulling the string from, a borehole and also whilst making up tubulars into/breaking out tubulars from the string.

Abstract: Apparatus and method for inserting or removing a string of tubulars from a subsea borehole, comprising: