A sensor transportation apparatus to convey a sensor assembly through a wellbore. The apparatus comprising has an engagement structure to connect the sensor transportation apparatus to the sensor assembly, and one or more wheels arranged to rotate about an axis of rotation substantially perpendicular to a longitudinal axis of the sensor assembly when the transportation apparatus is connected to the sensor assembly. An orientation structure defining a form having a transverse outline which has a rotational center, wherein the rotational center is offset from a centroidal axis of the elongate sensor assembly.

An oil injection unit to provide motor oil to the motor of an electric submersible pump. The oil injection unit includes an injection module containing an amount of motor oil to be injected into the motor, a sensor to detect a predetermined condition that indicates the need to inject motor oil into the motor, and an injection valve that can be selectively opened to inject motor oil to the motor upon detection by the sensor of the predetermined condition.

An oil injection unit to provide motor oil to the motor of an electric submersible pump. The oil injection unit includes an injection module containing an amount of motor oil to be injected into the motor, a sensor to detect a predetermined condition that indicates the need to inject motor oil into the motor, and an injection valve that can be selectively opened to inject motor oil to the motor upon detection by the sensor of the predetermined condition.

A method for installing an anchor having: making a hole into the material in which the anchor is to be installed, by using a hammer drill; after associating an anchor driver with the chuck of the hammer drill, using the so created anchor driver-hammer drill first assembly, with the hammer drill in hammer mode, to hammer the anchor into the hole; and, after switching the hammer drill to drill mode, tightening the nut or bolt of the anchor using the anchor driver-hammer drill first assembly, or a second assembly comprising the hammer drill and a socket.

A sensor transportation apparatus to convey an elongate sensor assembly through a wellbore, the sensor transportation apparatus comprises a pair of axles and a pair of wheels corresponding with the pair of axles with each wheel mounted on a respective said axle to rotate about an axis of rotation perpendicular to a longitudinal axis of the elongate sensor assembly. A protection structure extends longitudinally around each wheel to prevent a side of the wheel from contacting a wall of the wellbore. Each wheel extends above and below the protection structure to contact a side of the wellbore.

A sensor transportation apparatus to convey an elongate sensor assembly through a wellbore, the sensor transportation apparatus comprises a pair of axles and a pair of wheels corresponding with the pair of axles with each wheel mounted on a respective said axle to rotate about an axis of rotation perpendicular to a longitudinal axis of the elongate sensor assembly. A protection structure extends longitudinally around each wheel to prevent a side of the wheel from contacting a wall of the wellbore. Each wheel extends above and below the protection structure to contact a side of the wellbore.

A sensor transportation apparatus to convey a sensor assembly through a bore comprises at least one engagement structure to connect the sensor transportation apparatus to the sensor assembly, one or more wheels each arranged to rotate on a bearing about an axis of rotation substantially perpendicular to a longitudinal axis of the bore in use, and a lubrication system.

The lubrication system comprises a reservoir with an elastomer diaphragm, with an exterior side of the elastomer diaphragm subjected to an ambient bore pressure.

A sensor transportation apparatus to convey a sensor assembly through a bore comprises at least one engagement structure to connect the sensor transportation apparatus to the sensor assembly, one or more wheels each arranged to rotate on a bearing about an axis of rotation substantially perpendicular to a longitudinal axis of the bore in use, and a lubrication system.

The lubrication system comprises a reservoir with an elastomer diaphragm, with an exterior side of the elastomer diaphragm subjected to an ambient bore pressure.

Systems, apparatus, articles of manufacture, and methods are disclosed that include a casing including a first reservoir and a second reservoir, a first passageway to fluidly couple the first reservoir and the second reservoir, a second passageway to fluidly couple the first reservoir and the second reservoir, the second passageway separate from the first passageway, and a breather tube at least partially positioned in the first reservoir, the breather tube to fluidly couple the first reservoir and the second reservoir via the second passageway.

A lubrication system of a gas turbine engine includes a lubricant reservoir with a housing having a volume of oil located therein. A reservoir passage extends through the housing. One or more side passages extend from the reservoir passage and are configured to selectably fill or drain the volume of oil. An output passage is separate and distinct from the reservoir passage, and a separator wall extends into the interior of the housing from the first housing wall toward the second housing wall and between the reservoir passage and the output passage. When the lubricant reservoir is in a first orientation, the lubricant reservoir is filled via oil flowed through the reservoir passage from the first housing end, and when operated in a negative G orientation, the lubricant reservoir is drained via oil flowed through the reservoir passage and out of the second housing end.