Abstract: An apparatus for use in the oil and gas industry for installation of drilling and production liners and sub-sea casing strings into a borehole through a drilling fluid on a workstring using a running tool with the benefits of surge pressure reduction is disclosed. In an embodiment, a convertible diverter device has a housing with diverting flow path which diverts fluid from its axial passageway to the annular space outside the convertible diverter device, and a closing sleeve, residing within the housing, the closing sleeve having a diverting position and a closed position. In the diverting position, the diverting flow path is not blocked by the closing sleeve, and in the closed position the closing sleeve sealingly blocks the diverting flow path, so only the axial passageway through the housing is accessible for passage of fluid and tools.

Abstract: An apparatus that provides for the temporary plugging of a pipe string is disclosed. In an embodiment, the apparatus is a temporary tubing plug apparatus comprising a housing having an axial internal passageway. The housing being connected to a pipe string on at least a first end of the housing. The temporary tubing plug apparatus also includes a frangible plug. The frangible plug having a first support surface and a second support surface, supported within the housing. The frangible plug also has a first position where its first support surface is supported by a first resilient cushioning material which is permanently bonded to a rigid substrate.

Abstract: A tool for economically, efficiently, and reliably separating a workstring in a wellbore is disclosed.

Abstract: A retrievable frac packer is provided which allows frac operations to be conducted with a single, retrievable tool, with the capability of providing positive zone production indications during production testing.

Abstract: A device for providing a seal between two tubular member in a downhole environment is presented. The sealing device provides the capability of “boosting” or improving the seal, in the event of hydraulic pressure increases from above or below the seal.

Abstract: The present invention provides methods and apparatus for cutting tubulars in a wellbore. In one aspect of the invention, a cutting tool having radially disposed rolling element cutters is provided for insertion into a wellbore to a predetermined depth where a tubular therearound will be cut into an upper and lower portion. The cutting tool is constructed and arranged to be rotated while the actuated cutters exert a force on the inside wall of the tubular, thereby severing the tubular therearound. In one aspect, the apparatus is run into the well on wireline which is capable of bearing the weight of the apparatus while supplying a source of electrical power to at least one downhole motor which operates at least one hydraulic pump. The hydraulic pump operates a slip assembly to fix the downhole apparatus within the wellbore prior to operation of the cutting tool. Thereafter, the pump operates a downhole motor to rotate the cutting tool while the cutters are actuated.