A sealing method for a drilled hole in three zones of overburden comprises: blocking the fissure zone and the caving zone with at least one filling bag; and transporting prepared cement slurry to the drilled hole through a hollow drill pipe, so as to block the curved subsidence zone. The three zones of overburden comprise a fissure zone, a caving zone and a curved subsidence zone.

A filter tool for a wellbore may include an outer housing, a filtration system, at least one filter tool sensor, and a filter motor. The outer housing may have an interior wall comprising at least one port and an exterior wall defining an exterior surface of the filter tool. The exterior wall may be movable between a first position in which the exterior wall covers the at least one port in the interior wall and a second position in which the exterior wall uncovers the at least one port in the interior wall. The interior wall of the outer housing and the filtration system may cooperate to define a collection chamber. The filter motor may move the exterior wall of the outer housing between the first position and the second position. Embodiments also include systems and methods employing the filter tool.

A piston assembly may comprise a housing with a wall, and at least one chamber formed in the wall. A piston may be disposed within the chamber and at least one passageway may pass through the piston. At least one pin may be disposed within the passageway and attached to the chamber, and the piston may be free to translate relative to the pin.

The present invention relates to apparatus and method for collecting fluid from a drill string (4) or borehole casing, the apparatus comprising a collection casing (2) having means for sealably engaging around a drill string or borehole casing to create a chamber (6) between the interior of the collection casing and the drill string or borehole casing, and one or more fluid nozzles (7) for directing cleaning fluid into the interior of the chamber, wherein the one or more nozzles are configured to direct cleaning fluid to impact the inwardly facing interior surface of the collection casing.

The present invention relates to apparatus and method for collecting fluid from a drill string (4) or borehole casing, the apparatus comprising a collection casing (2) having means for sealably engaging around a drill string or borehole casing to create a chamber (6) between the interior of the collection casing and the drill string or borehole casing, and one or more fluid nozzles (7) for directing cleaning fluid into the interior of the chamber, wherein the one or more nozzles are configured to direct cleaning fluid to impact the inwardly facing interior surface of the collection casing.

A payload deployment tool is provided. The tool includes a housing having a coupler configured to couple to a fluid delivery conduit; a pressure chamber in communication with the coupler; a plurality of payload chambers in communication with the pressure chamber, each of the payload chambers having an upstream opening and a downstream opening; and a plurality of upstream pressure-rupturable seals respectively covering the upstream openings.

Techniques described herein relate to a method for identifying downhole conditions during a drilling operation using a vibratory separator. The method includes calibrating a sensor system attached to the vibratory separator by periodically measuring the G-force acting on the vibratory separator functioning under steady-state operating parameters. The method also includes determining the relationship between the G-force acting on the vibratory separator and the flow rate and rate of penetration (ROP) for the drilling operation by measuring the G-force acting on the vibratory separator functioning under different non-steady-state operating parameters. The method further includes determining an expected total basket weight for each G-force measurement using the G-force/flow rate/ROP relationship, monitoring a current total basket weight of the vibratory separator functioning under current operating parameters, and identifying a downhole condition if the current total basket weight is greater or less than the expected total basket weight for the current operating parameters.

Techniques described herein relate to a method for identifying downhole conditions during a drilling operation using a vibratory separator. The method includes calibrating a sensor system attached to the vibratory separator by periodically measuring the G-force acting on the vibratory separator functioning under steady-state operating parameters. The method also includes determining the relationship between the G-force acting on the vibratory separator and the flow rate and rate of penetration (ROP) for the drilling operation by measuring the G-force acting on the vibratory separator functioning under different non-steady-state operating parameters. The method further includes determining an expected total basket weight for each G-force measurement using the G-force/flow rate/ROP relationship, monitoring a current total basket weight of the vibratory separator functioning under current operating parameters, and identifying a downhole condition if the current total basket weight is greater or less than the expected total basket weight for the current operating parameters.

A debris collection tool includes a mandrel having a longitudinal flowbore therethrough and an inner sleeve disposed around the mandrel. A first array of magnets is arranged on the inner sleeve. A second array of magnets is disposed around the inner sleeve. The first array of magnets is moveable with respect to the second array of magnets. The debris collection tool further includes an adaptor sleeve concentric with the mandrel and a linkage coupling the adaptor sleeve with the inner sleeve.

Systems and methods for collecting debris in a subterranean well include a wellbore cleanout tool having a tool housing with a tool bore. The wellbore cleanout tool further includes a power source, a wire in electrical communication with the power source, and a core member located within the tool bore. The wire is wound around the core member with a first end and a second end of the wire in electrical connection with a positive terminal and a negative terminal of the power source, respectively. A plurality of magnetic bars are spaced around the core member. A sleeve member is moveable between an uphole position where the sleeve member circumscribes the plurality of magnetic bars, and a downhole position where the sleeve member is located downhole of a portion of the plurality of magnetic bars and can be a collection basket. The wellbore cleanout tool further has a permanent magnet.