A coiled tubing system (10) for use in deploying a tubing string (12) into a conduit (14) comprises the tubing string (12) and a fluid discharge apparatus (26) disposed at a distal end of the tubing string (12). The tubing string (12) includes a first tubing portion (28) comprising composite coiled tubing and a second tubing portion (30) comprising metallic coiled tubing. The system (10) is configured to deploy the tubing string (12) and the fluid discharge apparatus (26) into the conduit (14), the fluid discharge apparatus (26) operable to generate pressure pulses which facilitate transport of the tubing string (12) further along the conduit 14.

A coiled tubing system (10) for use in deploying a tubing string (12) into a conduit (14) comprises the tubing string (12) and a fluid discharge apparatus (26) disposed at a distal end of the tubing string (12). The tubing string (12) includes a first tubing portion (28) comprising composite coiled tubing and a second tubing portion (30) comprising metallic coiled tubing. The system (10) is configured to deploy the tubing string (12) and the fluid discharge apparatus (26) into the conduit (14), the fluid discharge apparatus (26) operable to generate pressure pulses which facilitate transport of the tubing string (12) further along the conduit 14.

An apparatus and method for assisting transportation of a tool down a wellbore. The apparatus comprises an elongate body having an exterior surface extending between top and bottom ends, a connector at the bottom end operable to be secured above the tool and at least one passage formed into the exterior surface defining a first flow path having an entrance and an exit oriented towards the top end of the elongate body. The method comprises securing the elongate body to a top end of a tool in a wellbore, directing a flow of fluid down the wellbore to a position above the elongate body, separating the flow of the fluid into an inner portion and an outer portion through radially separated paths and redirecting the inner portion to flow upwards into the outer portion of the flow of the fluid.

An apparatus and method for assisting transportation of a tool down a wellbore. The apparatus comprises an elongate body having an exterior surface extending between top and bottom ends, a connector at the bottom end operable to be secured above the tool and at least one passage formed into the exterior surface defining a first flow path having an entrance and an exit oriented towards the top end of the elongate body. The method comprises securing the elongate body to a top end of a tool in a wellbore, directing a flow of fluid down the wellbore to a position above the elongate body, separating the flow of the fluid into an inner portion and an outer portion through radially separated paths and redirecting the inner portion to flow upwards into the outer portion of the flow of the fluid.

A borehole plug or packer for treating is designed to be flowed back to a surface location after use. When the treatment is concluded pressure from above is relieved or lowered, and well fluid is flowed back, so that the plug or plugs disengages at slips designed to resist differential pressure from above. The application of differential pressure from below causes the lower slips to release one or more of such plugs in the hole into specialized sub surface or surface capture equipment so that well pressure is relieved before removal of the plugs from specialized subsurface or surface capture equipment. Sensors to obtain and store data can be incorporated into the plugs or into objects landed on the plugs so that when brought to the surface the data can be processed and used in aid of production.

Disclosed is a sliding sleeve assembly that includes a sliding sleeve sub coupled to a work string extended within a wellbore, the sliding sleeve sub having one or more ports defined therein that enable fluid communication between an interior and an exterior of the work string, a sliding sleeve arranged within the sliding sleeve sub and movable between a closed position, where the sliding sleeve occludes the one or more ports, and an open position, where the sliding sleeve has moved to expose the one or more ports, a sleeve profile defined on an inner surface of the sliding sleeve, a wellbore dart having a body and a plurality of collet fingers extending longitudinally from the body, and a dart profile defined on an outer surface of the plurality of collet fingers, the dart profile being configured to selectively mate with the sleeve profile.

Disclosed is a sliding sleeve assembly that includes a sliding sleeve sub coupled to a work string extended within a wellbore, the sliding sleeve sub having one or more ports defined therein that enable fluid communication between an interior and an exterior of the work string, a sliding sleeve arranged within the sliding sleeve sub and movable between a closed position, where the sliding sleeve occludes the one or more ports, and an open position, where the sliding sleeve has moved to expose the one or more ports, a sleeve profile defined on an inner surface of the sliding sleeve, a wellbore dart having a body and a plurality of collet fingers extending longitudinally from the body, and a dart profile defined on an outer surface of the plurality of collet fingers, the dart profile being configured to selectively mate with the sleeve profile.

The present invention relates to a downhole completion device configured to be mounted as part of a well tubular metal structure. The downhole completion device comprises a housing enclosing a closed space, an electrical component arranged in the space inside the housing, the housing being filled with a liquid having a first volume of 1 bar at 20° C., wherein the housing has a first housing section and a second housing section, the first housing section having a first thickness and the second housing section having a second thickness, and the second thickness being smaller than the first thickness so that the second housing section is more flexible than the first housing section. Furthermore, the invention relates to a downhole completion system.

The present invention relates to a downhole completion device configured to be mounted as part of a well tubular metal structure. The downhole completion device comprises a housing enclosing a closed space, an electrical component arranged in the space inside the housing, the housing being filled with a liquid having a first volume of 1 bar at 20° C., wherein the housing has a first housing section and a second housing section, the first housing section having a first thickness and the second housing section having a second thickness, and the second thickness being smaller than the first thickness so that the second housing section is more flexible than the first housing section. Furthermore, the invention relates to a downhole completion system.

Downhole apparatus comprises first and second tools for location in a tubing string. The first tool has a first seat of a first diameter and the second tool has a second seat of a second diameter larger than the first diameter. First and second activating devices are provided for use in activating the respective first and second tools. The first activating device includes a first activating profile having an extended diameter larger than the first diameter and smaller than the second diameter and a retracted diameter smaller than the first diameter. The second activating device includes a second activating profile having an extended diameter larger than the second diameter and a retracted diameter smaller than the first diameter.