Owen Oil Tools, Inc.

Jeffrey D Gartz

Timothy E Lagrange

Rockford A Linville

Timothy Edward LaGrange

Jeffrey D Wood

Ian Morrison

Garret William Hansen

Robert Michael Frederick Lesiuk

Timothy E LaGrange

A firing head for selectively activating an initiator of a downhole tool may include a housing, a pin, and a moveable stopper. The housing may have a bore and a radially enlarged chamber formed along the bore. The pin is disposed in the bore and has a circumferential groove formed on an outer surface of the shank. The moveable stopper is disposed in the radially enlarged chamber. The stopper is only partially disposed in the groove when the housing is in a vertical position. The stopper moves out of the groove when the housing has a predetermined minimum angular deviation from the vertical position.

Safe firing head for deviated wellbores

A signal transfer assembly includes a signal transfer propellant assembly and a signal transfer connector tube in hydraulic communication with a signal transfer firing head. The signal transfer propellant assembly has a piston and a gas generating energetic material. The signal transfer connector tube has a bore and a first opening allowing fluid communication between a borehole fluid surrounding the connector tube and the bore. The piston generates a pressure pulse when propelled through the bore by the generated gas. The signal transfer firing head assembly includes a housing having a second opening allowing fluid communication between the housing bore and the borehole fluid. A related method includes forming a well tool by operatively connecting a signal transfer assembly as described above to a primary downhole tool and a secondary downhole tool; conveying the well tool into a wellbore using a work string; and activating the secondary downhole tool by initiating the primary downhole tool.

Signal transfer system for activating downhole tools and related methods

A firing head assembly for a well tool includes a shaft, a piston head, a biasing member, and a housing. The shaft has a nose and a terminal end. The shaft also includes a first shoulder and a second shoulder formed between the nose and the terminal end. The piston head slides along the shaft and is positioned between the retaining element and the first shoulder. The biasing member is mounted on the shaft and positioned between the piston head and the second shoulder. The housing has a bore in which the shaft, the piston head, and biasing member are disposed. The housing includes an opening allowing fluid communication between the housing bore and the borehole fluid external to the housing.

Differential pressure firing heads for wellbore tools and related methods

A well tool () includes a perforating gun (), a sealing element (), at least one pressure sensor (), a detector (), a controller (), and an anchor (). The perforating gun () perforates the wellbore tubular in response to a firing signal. The sealing element () is connected to the perforating gun () and generates a pressure differential thereacross. The at least one pressure sensor () is associated with the sealing element () and detects a surface transmitted pressure signal. The detector () detects at least one marker () positioned along the wellbore () and which includes a perforating marker () associated with a perforating depth. The controller () is in signal communication with the at least one pressure sensor () and the detector () and is configured to transmit the firing signal to the perforating gun () only after: (i) the at least one pressure sensor () detects the surface transmitted pressure signal, and (ii) the detector () detects the perforating marker (). The anchor () is connected to the perforating gun () and selectively locks the perforating gun () to the wellbore tubular.

Perforating gun

A perforating gun has shaped charges that can generate a high-pressure gas. A valve sub connects to the perforating gun and a reservoir sub connects to the valve sub. The valve sub has an enclosure with a port. A mandrel in the enclosure has a piston head and a fluid path extending at least partially through the mandrel. A sleeve is slidably mounted on the mandrel and selectively blocks fluid flow through the port. A pressure chamber in the sleeve receives the generated high-pressure gas via the fluid path. The sleeve slides toward the perforating gun after a predetermined pressure is created by the generated high-pressure gas in the pressure chamber. The reservoir sub may have at least one chamber in fluid communication with the interior of the valve sub.

Perforating gun for underbalanced perforating

An apparatus for use in dispensing fluid into a wellbore includes a piston element releasably coupled to a housing and a detonator in the housing that applies a force sufficient to release the piston element from the housing when activated. The apparatus also has an intermediate section that mates with the upper section, an elongated member coupled to the piston and that is positioned in a bore of the intermediate section; and a lower section having a housing that mates with the intermediate section. The housing includes at least one opening providing communication between a bore of the housing and an exterior of the housing; and a movable barrier in the lower section. The movable barrier has a first position, wherein the barrier substantially blocks communication between the bore of the intermediate section and the at least one opening, and a second position, wherein the barrier does not substantially block communication between the bore of the intermediate section and the at least one opening.

Growing community of inventors

Lacombe, Canada

Jeffrey D Gartz