A downhole tool for cleaning and sealing a wellbore includes a wash tool configured at a downhole end of the downhole tool to generate pulses of a first fluid at a first frequency and a first pressure for washing a target interval of a wellbore. The downhole tool further includes a plugging tool configured uphole or downhole from the wash tool to generate pulses of a second fluid at a second frequency and a second pressure for depositing a sealing plug at the target interval of the wellbore. The second fluid has a higher viscosity than the first fluid, the second frequency is lower than the first frequency, and the second pressure is higher than the first pressure.

A downhole tool for cleaning and sealing a wellbore includes a wash tool configured at a downhole end of the downhole tool to generate pulses of a first fluid at a first frequency and a first pressure for washing a target interval of a wellbore. The downhole tool further includes a plugging tool configured uphole or downhole from the wash tool to generate pulses of a second fluid at a second frequency and a second pressure for depositing a sealing plug at the target interval of the wellbore. The second fluid has a higher viscosity than the first fluid, the second frequency is lower than the first frequency, and the second pressure is higher than the first pressure.

In accordance with embodiments of the present disclosure, a gravel pack system includes a service tool used to maintain a pressure of the wellbore below a hydraulic packer at the same pressure of workstring tubing above the hydraulic packer, prior to and during setting the hydraulic packer. The service tool includes a washpipe disposed at a lower portion of the service tool, a crossover port in a wall of the service tool that enables fluid to flow between workstring tubing and a space between the service tool and a completion string. The service tool also includes a valve disposed in the wall of the service tool that directs fluid from the space between the service tool and the completion string into the service tool and toward the washpipe when the valve is open, the valve being closeable in response to compression of the service tool.

This invention relates to a dump bailer (1) for insertion into a well (20) in the ground. The dump bailer (1) includes a receptacle (2) which communicates with surroundings through an inlet (4) and an outlet (6), and a pump (10) positioned in a flow path (7) between the inlet (4) and the outlet (6). The pump (10) is positioned at the outlet (6), and the pump (10) during transport of the dump bailer (1) in the well (20) constitutes a sealed barrier for the carried material (18) in the receptacle (2). A method for use of the dump bailer (1) is also described.

A down-hole packer is provided for positioning in a wellbore to establish a seal with a surrounding surface. The packer includes a sealing element that is responsive to compression by a setting piston to radially expand into the wellbore. An actuator is provided to longitudinally move the setting piston in response to a telemetry signal received by the down-hole packer. The actuator can include a hydraulic pump, an electromechanical motor or valves operable to control hydraulic energy to apply a down-hole force to the setting piston.

A down-hole packer is provided for positioning in a wellbore to establish a seal with a surrounding surface. The packer includes a sealing element that is responsive to compression by a setting piston to radially expand into the wellbore. An actuator is provided to longitudinally move the setting piston in response to a telemetry signal received by the down-hole packer. The actuator can include a hydraulic pump, an electromechanical motor or valves operable to control hydraulic energy to apply a down-hole force to the setting piston.

The present invention relates to a downhole wireline intervention tool for performing intervention in a well, comprising a wireline, a motor powered by the wireline, a positive displacement pump driven directly or indirectly by the motor for delivering a flow of fluid, an expandable bladder expanded by fluid delivered by the positive displacement pump, and a flow control device comprising an inlet, a piston and a venting port fluidly connected to the well, the piston being movable between a first position in which the venting port is fluidly connected to the expandable bladder and a second position in which the venting port is fluidly isolated from the expandable bladder for expanding the expandable bladder. The present invention also relates to a downhole system comprising a well tubular metal structure, an intervention method for intervening a well by means of the downhole wireline intervention tool according to the present invention and finally, the use of the downhole wireline intervention tool according to the present invention.

The present invention relates to a wireline plug system for setting a permanent plug in a well for plugging and abandonment, comprising a wireline pumping tool comprising a pump powered from surface via a wireline, the pump comprising a pump inlet and a pump outlet, the wireline pumping tool having a first end connected to the wireline and a second end, a plugging and abandonment plug comprising a first plug end and an opening in the first plug end, and an engagement tool for releasably connecting the plug to the wireline pumping tool, the engagement tool having a through-bore fluidly connecting the opening in the first plug end with the pump outlet, wherein the plugging and abandonment plug comprises a tubular metal part and an expandable metal sleeve surrounding and connected to an outer face of the tubular metal part, the tubular metal part having an expansion aperture fluidly connecting an inside of the tubular metal part and a cavity between the expandable metal sleeve and the tubular metal part. The invention also relates to a wireline plug setting method for setting a permanent plug in a well for plugging and abandonment on the wireline.

A downhole tool for cleaning and sealing a wellbore includes a wash tool configured at a downhole end of the downhole tool to generate pulses of a first fluid at a first frequency and a first pressure for washing a target interval of a wellbore. The downhole tool further includes a plugging tool configured uphole or downhole from the wash tool to generate pulses of a second fluid at a second frequency and a second pressure for depositing a sealing plug at the target interval of the wellbore. The second fluid has a higher viscosity than the first fluid, the second frequency is lower than the first frequency, and the second pressure is higher than the first pressure.

Systems and methods for increasing hydrocarbon production using an electrical submersible pump are described. The methods typically include, for example, configuring an electrical submersible pump comprising a gas separator to induce a gas lift effect in a well comprising a tubing within a casing. Hydrocarbon production from the well is therefore increased using the electrical submersible pump.