Abstract: An apparatus that is usable with a well includes a first portion and a second portion. The first portion includes a first plurality of segments, and the second portion includes a second plurality of segments. The apparatus is deployable in a tubing string that is installed in the well, and the second plurality of segments is adapted to engage the tubing string and exert a force on the first plurality of segments. The first plurality of segments is adapted to expand to form a seat in the tubing string to receive an untethered object in response to the force, and the second plurality of segments is adapted to be released from the first plurality of segments downhole in the well.

Abstract: A flowable blend of materials can include a first particulate material that includes an aluminum alloy where the aluminum alloy is at least approximately eighty percent by weight of the first particulate material and one or more metals selected from a group consisting of alkali metals, alkaline earth metals, group 12 transition metals, and basic metals having an atomic number equal to or greater than 31, where the one or more metals selected from the group total at least approximately two percent by weight of the first particulate material; and a second particulate material where the composition of the first particulate material differs from the composition of the second particulate material.

Abstract: A method can include providing a blend of a first particulate material and a second particulate material where the first particulate material includes an aluminum alloy where the aluminum alloy is at least approximately eighty percent by weight of the first particulate material and one or more metals selected from a group consisting of alkali metals, alkaline earth metals, group 12 transition metals, and basic metals having an atomic number equal to or greater than 31, where the one or more metals selected from the group total at least approximately two percent by weight of the first particulate material and where the composition of the first particulate material differs from the composition of the second particulate material; forming a solid from the blend; and heat treating the solid to augment strength of the solid.

Abstract: Filter arrangements and components therefore are described. Example arrangements are described. In one, a serviceable filter cartridge includes upper and lower end pieces, each having a seal thereon; the upper having a rigid protection thereon, the lower having a non-circular outer perimeter.

Abstract: A method includes running an assembly on a tool in a contracted state into a well. The assembly includes segments that are adapted to be radially contracted and arranged in a first number of layers along a longitudinal axis of the assembly in the contracted state of the assembly. The technique includes using the tool to expand the assembly downhole in the well to transition the assembly between the contracted state and an expanded state. Using the tool to expand the seat assembly includes radially expanding the segments and longitudinally contracting the segments to arrange the layers in a second number of layers having at least one layer less than the first number.

Abstract: A method includes deploying an assembly in a contracted state on a tool into a well. The assembly includes segments that are adapted to be radially contracted in the contracted state. The method further includes expanding the assembly downhole in the well using the tool to transition the assembly between the contracted state and an expanded state. Expanding the assembly includes using linkages to guide the segments during the expansion.

Abstract: An embodiment may take the form of a method usable with a well including communicating an untethered object downhole in the well to land the object in a restriction to form a fluid barrier, and using an agent carried by the untethered object to seal at least one gap in the fluid barrier. Another embodiment may take the form of an apparatus usable with a well having a solid component to be deployed and be communicated downhole as an untethered object to land in a restriction in the well to form a fluid barrier and an agent attached to the solid component to seal at least one gap in the fluid barrier.

Abstract: An embodiment may take the form of a method usable with a well including pumping an untethered object into the well to land on a restriction downhole in the well and using the restriction to trigger release of an agent carried by the object into the well. Another embodiment may take the form of an apparatus usable with a well having a solid object adapted to be pumped into the well and an agent to be adapted to be released from the solid object in response to the solid object landing on a restriction in the well.

Abstract: The techniques herein relate to a pressure compensation system for a sensor in a wellbore having a wellbore fluid therein. The system includes a downhole tool (104) and at least one pressure compensator (112) positionable therein. The pressure compensator includes a first compensating fluid section having a first compensating fluid (238) therein, a first pressure compensation section having a first pressure regulation device (226) for adjusting a compensation pressure of the first compensating fluid based on a wellbore pressure of the wellbore fluid, at least one second compensating fluid section having a second compensating fluid (252) therein, and at least one second pressure compensation section having a second pressure regulation device (246) for adjusting a sensor pressure of the second compensating fluid based on the compensation pressure of the first compensating fluid.

Abstract: Crankcase ventilation filter arrangements and components therefore are described. Example arrangements are described. In one, a serviceable filter cartridge includes a check valve therein, for protection during vehicle rollover. Handle arrangements are also described. Methods of use are described.

Abstract: An apparatus that is usable with a well includes a first portion and a second portion. The first portion includes a first plurality of segments, and the second portion includes a second plurality of segments. The apparatus is deployable in a tubing string that is installed in the well, and the second plurality of segments is adapted to engage the tubing string and exert a force on the first plurality of segments. The first plurality of segments is adapted to expand to form a seat in the tubing string to receive an untethered object in response to the force, and the second plurality of segments is adapted to be released from the first plurality of segments downhole in the well.

Abstract: A technique that is usable with a well includes deploying a segmented ring assembly in the well; and disposing the segmented ring assembly between a first element fixed in place in the well and a second unfixed element. The technique includes using the second element to compress the assembly to produce radially and tangentially acting forces on segments of the assembly.

Abstract: Methods and packages for containing electronics components are described that use characteristic dimensions, so that the electronics components can remain electrically functional within the package subjected to harsh environments, such as a subterranean environment.

Abstract: Crankcase ventilation filter arrangements and components therefore are described. Example arrangements are described. In one, a serviceable filter cartridge includes a check valve therein, for protection during vehicle rollover. Handle arrangements are also described. Methods of use are described.

Abstract: The techniques herein relate to a pressure compensation system for a sensor in a wellbore having a wellbore fluid therein. The system includes a downhole tool (104) and at least one pressure compensator (112) positionable therein. The pressure compensator includes a first compensating fluid section having a first compensating fluid (238) therein, a first pressure compensation section having a first pressure regulation device (226) for adjusting a compensation pressure of the first compensating fluid based on a wellbore pressure of the wellbore fluid, at least one second compensating fluid section having a second compensating fluid (252) therein, and at least one second pressure compensation section having a second pressure regulation device (246) for adjusting a sensor pressure of the second compensating fluid based on the compensation pressure of the first compensating fluid.

Abstract: A technique that is usable with a well includes deploying a seat assembly into a tubing string; releasing the seat assembly at a downhole location inside the tubing string; pumping the seat assembly to a restriction in the tubing string at a second downhole location; and using an untethered object received in a seat assembly to form an obstruction in the tubing string.

Abstract: A method includes running an assembly on a tool in a contracted state into a well. The assembly includes segments that are adapted to be radially contracted and arranged in a first number of layers along a longitudinal axis of the assembly in the contracted state of the assembly. The technique includes using the tool to expand the assembly downhole in the well to transition the assembly between the contracted state and an expanded state. Using the tool to expand the seat assembly includes radially expanding the segments and longitudinally contracting the segments to arrange the layers in a second number of layers having at least one layer less than the first number.

Abstract: An apparatus that is usable with a well includes a first component and a second component. The first component is adapted to dissolve at a first rate, and the second component is adapted to contact the first component to perform a downhole operation and dissolve at a second rate that is different from the first rate.

Abstract: Crankcase ventilation filter arrangements and components therefore are described. Example arrangements are described. In one, a serviceable filter cartridge includes a check valve therein, for protection during vehicle rollover. Handle arrangements are also described. An example filter cartridge is described in which media, surrounding an open interior, is positioned between first and second, opposite, end pieces. A first end piece has a projection on an opposite side from the media, the projection including framework having an upper rail supported by spaced supports. Methods of use are described.

Abstract: A technique includes deploying a seat assembly having a plurality of segments into a tubing string installed in a well and expanding the seat assembly at a downhole location in the well to secure the assembly to the tubing string and form a seat that is adapted to receive an untethered object. The technique includes receiving the untethered object in the seat of the seat assembly and using the received untethered object in the seat assembly to perform a downhole operation in the well.