A system provides for the remote activation and deactivation of a downhole tool such as an agitator tool. The downhole tool uses a dart-catching section configured with a profile that engages with a corresponding key section of a dart. Different tools in the string may have different profiles, allowing darts to pass through tools to reach a tool with a matching profile further downhole. The dart includes a removable nozzle that can be detached by a object dropped from the surface, after which a second dart may be dropped to engage with the first dart to change operating parameters of the tool.

The present disclosure describes a wellhead system that includes a wellhead; a tank of corrosion inhibitor chemical; and an ejector device comprising: a high pressure nozzle connected to the wellhead through a first flowline; a low pressure nozzle connected to the tank of corrosion inhibitor chemical through a second flowline; and wherein the ejector device is configured to generate a gas and chemical mixture fluid that exits the ejector device and flows downstream of the wellhead system.

The invention relates to a cementing tool for use in oil and gas well decommissioning operations, in particular so called perforate, wash and cement procedures. The tool (1) is designed for running in a well on drill string and for jetting cement through previously formed perforations in the casing (10) to fill the outer annulus (9) with cement. The tool (1) has a cylindrical wall (3) which is formed from steel (11) and elastomeric (5) elements, whereby it is expandable between a first diameter in which it may be run down the well and a second, larger diameter deployed during cementing operations. (FIG. 2).

A shunt tube assembly includes a shunt tube having an inner flow path for a fluid and defining an opening in a sidewall of the shunt tube. A shunt nozzle is coupled to the sidewall and has an elongate slot defined therethrough and is aligned with the opening to provide fluid communication between the inner flow path and an exterior of the shunt tube. The elongate slot has a length and a height, and the length is greater than the height.

Cleanout tools and related methods of operation. At least some of the example embodiments are cleanout tools including a tool body that defines an internal annular channel, a joiner coupled to the tool body, a sleeve telescoped within the joiner and tool body, and a ball disposed within the annular channel. The ball held within the annular channel by the sleeve, and the ball configured to move along the annular channel under force of fluid pumped into the cleanout tool. The ball creates a pulsing of fluid streams exiting the tool body. Moreover, in some example systems the fluid streams created by the tool body intersect the inside diameter of a casing at non-perpendicular angles.

A stabilizer design for improving the likelihood of recovery of a drill string when obstructions are encountered in a wellbore is disclosed herein. The stabilizer includes a tubular body, a track, and a stabilizer blade. The track is disposed along the tubular body. The stabilizer blade is operatively coupled to the track and is configured to slide along the track from a first position to a second position.

A system for acid treating a section of a well includes a wireline or slickline extending from a surface of the well into the well and a bailer tool assembly attached to an end of the wireline or slickline. The bailer tool assembly includes a first piston positioned in a first piston housing at an axial end of at least one bailer, the first piston being slidable through the at least one bailer, at least one rotatable nozzle positioned at a lower end of the bailer tool assembly and fluidly connected to a fluid reservoir in the at least one bailer, and a depth indicator tool attached to an upper end of the bailer tool assembly.

A one-trip screen installation and cleaning system includes a tubular supporting a screen. The tubular has an inner surface defining a flow bore positioned radially inwardly of the screen. At least one actuator extends radially inwardly from the inner surface and is positioned axially offset relative to the screen. The at least one actuator includes at least one actuator surface. A wash pipe is arranged in the flow bore. The wash pipe includes a bypass valve including a selectively openable outlet port, a spray cleaning device arranged axially outwardly of the selectively openable outlet port, and an inflow control valve arranged between the selectively openable outlet port and the spray cleaning device.

A method for modifying a return fluid in a wellbore comprising disposing at least one valve along a drill pipe section of a drill string in the wellbore. At least one parameter of interest is determined at at least one location along the wellbore. At least one valve is controllably actuated to discharge at least a portion of at least one fluid from inside the drill string to an annulus in the wellbore to modify a local property of the return fluid in the annulus based at least in part on the measured parameter of interest.

The present disclosure relates to downhole tools and related methods that accelerate wormhole initiation and propagation during matrix acidizing of a hydrocarbon-bearing subterranean rock formation.