Abstract: A downhole tool and method for reducing friction between a tool string and a sidewall of a wellbore. The downhole tool includes a first wheel, a second wheel, and a hump. When the downhole tool is connected to the tool string, the first wheel, the second wheel, and the hump each extend away from the tool string and collectively define a curved outer profile extending circumferentially around at least a portion of a circumference of the tool string, and the curved outer profile has a geometric center that is offset from a central axis of the tool string.

Abstract: A downhole tool and method for reducing friction between a tool string and a sidewall of a wellbore. The downhole tool includes a first wheel, a second wheel, and a hump. When the downhole tool is connected to the tool string, the first wheel, the second wheel, and the hump each extend away from the tool string and collectively define a curved outer profile extending circumferentially around at least a portion of a circumference of the tool string, and the curved outer profile has a geometric center that is offset from a central axis of the tool string.

Abstract: A fleet refueling silo tank system gravity feeds fuel through hoses to fleet units without requiring pressurizing pumps. A specialized valve at the fleet unit fuel tank prevents vapor escape and admits fuel at low, gravity-feed pressures. The valve includes a valve body with an upper end and a lower end, the upper end adapted to engage a cap which affixes the valve body to the fuel tank fill mouth. Below the cap, a fuel cut-off plunger and seat selectively interrupt fuel flow through the mouth by responding to a buoyant float extending coaxially beneath the valve body and into the fuel tank. Linkage coupled to the plunger extends through the valve body to the float, and roller bearings within the valve body engage a shaft extending from the float coaxially into the lower end of the valve body.

Abstract: A fleet refueling silo tank system gravity feeds fuel through hoses to fleet units without requiring pressurizing pumps. Specialized valves at the fleet unit fuel tanks prevent vapor escape and admit fuel at low, gravity fed pressures. The cylindrical silo tank includes an upper, gravity feed dispensing chamber and a lower reservoir chamber. A fuel pump doubles as means for moving fuel from the reservoir chamber to the dispensing chamber and for refilling the reservoir from fuel delivery trucks. Onboard telemetry transmits fuel consumption and flow rates wirelessly to a control center where operators monitor safety parameters in real time. Stored data may be analyzed to calculate fleet unit maintenance and service intervals. A tractor trailer hauls the silo tank horizontally on roads and highways and includes a gantry and hydraulic lifts to erect the silo tank into vertical operating position supported by a built-in platform.

Abstract: A fleet refueling silo tank system gravity feeds fuel through hoses to fleet units without requiring pressurizing pumps. A specialized valve at the fleet unit fuel tank prevents vapor escape and admits fuel at low, gravity-feed pressures. The valve includes a valve body with an upper end and a lower end, the upper end adapted to engage a cap which affixes the valve body to the fuel tank fill mouth. Below the cap, a fuel cut-off plunger and seat selectively interrupt fuel flow through the mouth by responding to a buoyant float extending coaxially beneath the valve body and into the fuel tank. Linkage coupled to the plunger extends through the valve body to the float, and roller bearings within the valve body engage a shaft extending from the float coaxially into the lower end of the valve body.

Abstract: A fleet refueling silo tank system gravity feeds fuel through hoses to fleet units without requiring pressurizing pumps. Specialized valves at the fleet unit fuel tanks prevent vapor escape and admit fuel at low, gravity fed pressures. The cylindrical silo tank includes an upper, gravity feed dispensing chamber and a lower reservoir chamber. A fuel pump doubles as means for moving fuel from the reservoir chamber to the dispensing chamber and for refilling the reservoir from fuel delivery trucks. Onboard telemetry transmits fuel consumption and flow rates wirelessly to a control center where operators monitor safety parameters in real time. Stored data may be analyzed to calculate fleet unit maintenance and service intervals. A tractor trailer hauls the silo tank horizontally on roads and highways and includes a gantry and hydraulic lifts to erect the silo tank into vertical operating position supported by a built-in platform.

Abstract: A fleet refueling silo tank system gravity feeds fuel through hoses to fleet units without requiring pressurizing pumps. Specialized valves at the fleet unit fuel tanks prevent vapor escape and admit fuel at low, gravity fed pressures. The cylindrical silo tank includes an upper, gravity feed dispensing chamber and a lower reservoir chamber. A fuel pump doubles as means for moving fuel from the reservoir chamber to the dispensing chamber and for refilling the reservoir from fuel delivery trucks. Onboard telemetry transmits fuel consumption and flow rates wirelessly to a control center where operators monitor safety parameters in real time. Stored data may be analyzed to calculate fleet unit maintenance and service intervals. A tractor trailer hauls the silo tank horizontally on roads and highways and includes a gantry and hydraulic lifts to erect the silo tank into vertical operating position supported by a built-in platform.

Abstract: A downhole tool and method for orienting a tool string within a passage, wherein the passage is a wellbore or a tubular member disposed in a wellbore. The downhole tool may include a frame (210) operable for connection with the tool string (100), a first orienting feature (211) connected to a first side of the frame (210), and a second orienting feature (212) connected to a second side of the frame (210). The first orienting feature (211) may be rotatable relative to the frame about a first axis of rotation that is offset from a central axis of the tool string and the second orienting feature (212) may be rotatable relative to the frame about a second axis of rotation that is offset from the central axis of the tool string.

Abstract: Apparatus and methods for creating a downhole impact. The apparatus may be an impact tool operable to be coupled between portions of a tool string conveyable within a wellbore extending into a subterranean formation. The impact tool may include a housing, a chamber within the housing, a piston slidably disposed within the chamber and dividing the chamber into a first chamber volume and a second chamber volume, and a shaft connected with the piston and axially movable with respect to the housing. The first chamber volume may be open to a space external to the housing and the second chamber volume may be fluidly isolated from the space external to the housing. The piston may be maintained in a predetermined position within the chamber to maintain pressure within the second chamber volume appreciably lower than pressure within the first chamber volume while the impact tool is conveyed along the wellbore.

Abstract: Apparatus and methods for creating a downhole impact. The apparatus may be an impact tool operable to be coupled between portions of a tool string conveyable within a wellbore extending into a subterranean formation. The impact tool may include a housing, a chamber within the housing, a piston slidably disposed within the chamber and dividing the chamber into a first chamber volume and a second chamber volume, and a shaft connected with the piston and axially movable with respect to the housing. The first chamber volume may be open to a space external to the housing and the second chamber volume may be fluidly isolated from the space external to the housing. The piston may be maintained in a predetermined position within the chamber to maintain pressure within the second chamber volume appreciably lower than pressure within the first chamber volume while the impact tool is conveyed along the wellbore.

Abstract: A downhole tool and method for orienting a tool string within a passage, wherein the passage is a wellbore or a tubular member disposed in a wellbore. The downhole tool may include a frame (210) operable for connection with the tool string (100), a first orienting feature (211) connected to a first side of the frame (210), and a second orienting feature (212) connected to a second side of the frame (210). The first orienting feature (211) may be rotatable relative to the frame about a first axis of rotation that is offset from a central axis of the tool string and the second orienting feature (212) may be rotatable relative to the frame about a second axis of rotation that is offset from the central axis of the tool string.

Abstract: A device has a first, lower sub housing, a second, upper sub housing, and an extensible joint connecting the lower sub housing to the upper sub housing. A pressure equalization chamber is attached to the upper sub housing and demarcates an inner zone including an internal mechanism of the extensible joint, and an outer zone open to well bore fluids and pressure. A fluid barrier moves within the pressure equalization chamber in response to changes in well bore pressure to alter a volume of the inner zone to equalize a pressure of the inner zone.

Abstract: A device has a first, lower sub housing, a second, upper sub housing, and an extensible joint connecting the lower sub housing to the upper sub housing. A pressure equalization chamber is attached to the upper sub housing and demarcates an inner zone including an internal mechanism of the extensible joint, and an outer zone open to well bore fluids and pressure. A fluid barrier moves within the pressure equalization chamber in response to changes in well bore pressure to alter a volume of the inner zone to equalize a pressure of the inner zone.