Abstract: A method for lubricating a downhole tool into a wellbore with a lubricator assembly comprising a hydraulic cylinder with a cylinder and a rod and a pressure isolation assembly connected to the bottom of the cylinder of the hydraulic cylinder. The pressure isolation assembly has a base, a top, a plurality of posts supporting the top in a spaced apart relationship to the base, and a seal assembly supported by the base and configured to seal around the rod. The seal assembly includes a packing flange body having a flange portion and a tubular portion formed as a one piece unit. The flange portion extends across a portion of a lower side of the base and the tubular portion extends through base. The rod extends through the seal assembly of the pressure isolation assembly.

Abstract: A pipe conveyor apparatus for transporting a joint of pipe between a pipe storage rack and a rig floor elevated above the pipe storage rack. The apparatus includes at least two boom assemblies and a drive assembly. The boom assemblies are positioned such that booms are positioned in a spaced apart, parallel relationship relative to one another so that pipe support lugs of the booms are positioned to support at least two joints of pipe in a spaced apart and substantially horizontal position with the ends of the pipe positioned in a non-contact relationship with respect to the booms. The drive assembly is operably connected to the pipe support lugs in such a way that the pipe support lugs are movable in unison so as to move the joints of pipe between the proximal end and the distal end of the booms.

Abstract: A chemical mixing apparatus has a mixing tank having an inlet and an outlet, means for introducing a liquid into the mixing tank, and a tubular conveyor assembly having a first end and a second end. The second end of the conveyor assembly is sealably connected to the inlet of the mixing tank. A portable hopper having a sealable inlet and a sealable discharge conduit is detachably and sealably connected to the first end of the conveyor assembly such that a solid chemical contained in the chemical storage chamber of the portable hopper may be transported within the portable hopper from a remote location and conveyed from the portable hopper to the mixing tank without exposing the area surrounding the mixing tank to the solid chemical.

Abstract: A power tong assembly and backup tong assembly are disclosed. The power tong assembly includes a drive motor driving a drive gear engaged with a rotatable portion of a bearing assembly. The rotatable portion of the bearing assembly is connected to a cylindrical rotor positioned concentrically about jaws that grippingly engage and rotate a first tubular member when the portion of the bearing assembly rotates. The backup tong assembly comprises a pair of diametrically opposed gripper assemblies each having a cylinder with a cylinder rod, connected to a head member, connected to a pair of gripper members with gripping surfaces, so that extension of the cylinder rods causes the gripper members to grippingly engage a second tubular member. The power tong assembly and the backup tong assembly may be concentrically aligned to connect and disconnect the first and second tubular members.

Abstract: A rig including a base structure, a derrick extending from the base structure, a hydraulic lift cylinder connected to the upper end of the derrick, a lower slip assembly connected to the base structure, an upper slip assembly, and at least two snub cylinders connected to the base and the upper slip assembly. A distal end of a piston rod of the lift cylinder is connectable to a pipe string extendable through the upper and lower slip assemblies such that both a lifting force and a snubbing force may be applied simultaneously to the pipe string.

Abstract: A force compensator for a top drive assembly includes a carrier block, a pair of top drive link assemblies, a mandrel, and a shock absorber assembly. The top drive link assemblies being positionable on either side of a power swivel and having a lower end connectable to the power swivel, an upper end connected to the carrier block, and being slidably positionable on a derrick of a drilling rig. The mandrel is slidably disposed through the carrier block and has an upper end connectable to a mover assembly of the drilling rig. The shock absorber assembly is interposed between the carrier block and a lower end of the mandrel in such a way that the shock absorber assembly is movable between an expanded condition and a compressed condition.

Abstract: A hydraulic workover rig including a base structure, a derrick extending from the base structure, a hydraulic lift cylinder connected to the upper end of the derrick, a lower slip assembly connected to the base structure, an upper slip assembly, and at least two snub cylinders connected to the base and the upper slip assembly. A distal end of a piston rod of the lift cylinder is connectable to a pipe string extendable through the upper and lower slip assemblies such that both a lifting force and a snubbing force may be applied simultaneously to the pipe string.

Abstract: A hydraulic lubricator assembly includes a spool for enclosing a downhole tool, wherein the spool comprises an upper end and a lower end. The hydraulic lubricator assembly further includes a pressure isolation connector attached to the upper end of the spool, wherein the pressure isolation connector includes a lower packing gland and an upper packing gland. A hydraulic assembly is positioned above the pressure isolation connector, wherein the hydraulic assembly comprises a rod connected to the downhole tool, and wherein the hydraulic assembly lowers the downhole tool into the wellbore.

Abstract: A hydraulic workover rig including a base structure, a derrick extending from the base structure, a hydraulic lift cylinder connected to the upper end of the derrick, a lower slip assembly connected to the base structure, an upper slip assembly, and at least two snub cylinders connected to the base and the upper slip assembly. A distal end of a piston rod of the lift cylinder is connectable to a pipe string extendable through the upper and lower slip assemblies such that both a lifting force and a snubbing force may be applied simultaneously to the pipe string.

Abstract: A snubbing apparatus for moving well tubing through a blowout preventer including a support frame, a standing tubular engaging assembly, a pair of linear actuators, and a traveling tubular engaging assembly. The actuators have a cylinder and a rod, and the cylinder has an upper end and a lower end. The cylinders are connected to the support frame in a diametrically opposing relationship to one another and with the lower ends of the cylinders extending downwardly beyond the lower end of the support frame and spaced apart from one another a distance sufficient so that the lower ends of the cylinders are positioned on opposing sides of the blowout preventer when the support frame is connected to the blowout preventer.

Abstract: A force compensator for a top drive assembly includes a carrier block, a pair of top drive link assemblies, a mandrel, and a shock absorber assembly. The top drive link assemblies being positionable on either side of a power swivel and having a lower end connectable to the power swivel, an upper end connected to the carrier block, and being slidably positionable on a derrick of a drilling rig. The mandrel is slidably disposed through the carrier block and has an upper end connectable to a mover assembly of the drilling rig. The shock absorber assembly is interposed between the carrier block and a lower end of the mandrel in such a way that the shock absorber assembly is movable between an expanded condition and a compressed condition.

Abstract: A chemical mixing apparatus has a mixing tank having an inlet and an outlet, means for introducing a liquid into the mixing tank, and a tubular conveyor assembly having a first end and a second end. The second end of the conveyor assembly is sealably connected to the inlet of the mixing tank. A portable hopper having a sealable inlet and a sealable discharge conduit is detachably and sealably connected to the first end of the conveyor assembly such that a solid chemical contained in the chemical storage chamber of the portable hopper may be transported within the portable hopper from a remote location and conveyed from the portable hopper to the mixing tank without exposing the area surrounding the mixing tank to the solid chemical.

Abstract: A snubbing apparatus for moving well tubing through a blowout preventer including a support frame, a standing tubular engaging assembly, a pair of linear actuators, and a traveling tubular engaging assembly. The actuators have a cylinder and a rod, and the cylinder has an upper end and a lower end. The cylinders are connected to the support frame in a diametrically opposing relationship to one another and with the lower ends of the cylinders extending downwardly beyond the lower end of the support frame and spaced apart from one another a distance sufficient so that the lower ends of the cylinders are positioned on opposing sides of the blowout preventer when the support frame is connected to the blowout preventer.

Abstract: A portable hydraulic rig for workover, drilling or other operations on existing wells in which the rig has a derrick elevated on a base structure comprised of containers for equipment used in association with drilling or workover activities, a work platform including pipe rack sections for storing a plurality of pipes, the derrick being open-sided with a power cylinder at its upper end for lifting and lowering pipe sections away from and into each well, and hydraulic drive cylinders for advancing the rig between wells without telescoping or pivoting the derrick into a travel position, all of the hydraulic components being controlled from a central control panel on the work platform.