摘要:
A method of performing an operation in a wellbore is provided. The method includes introducing a tool into the wellbore. The tool comprises a mandrel comprising a port; and a plug located within the port. The plug comprises at least a first material that partially or wholly dissolves via corrosion. The method further includes introducing a cement composition into an annulus located between the outside of the tool at least at the location of the port and the inside of the wellbore, and causing or allowing at least a portion of the first material to dissolve. The step of causing or allowing is performed after the step of introducing the cement composition.
摘要:
Electrically-operated downhole tools are run into a wellbore on a coiled tubing string which includes tube-wire that is capable of carrying power and data along its length. During operation, a downhole tool is provided power from surface using the tube-wire. Downhole data is provided to the surface via tube-wire.
摘要:
A well tool can include a magnetic sensor having opposite sides, and a magnetic shield that conducts an undesired magnetic field from one side to the other side of the sensor. Another well tool can include a magnetic sensor in a housing, the sensor having opposite longitudinal sides relative to a housing longitudinal axis, and a magnetic shield interposed between the housing and each of the opposite longitudinal sides of the magnetic sensor. Another well tool can include at least two magnetic sensors, one magnetic sensor sensing a magnetic field oriented orthogonal to the housing longitudinal axis, and another magnetic sensor sensing a magnetic field oriented parallel to the longitudinal axis, and a magnetic shield interposed between a housing and each of opposite longitudinal sides of the magnetic sensors.
摘要:
A magnetic sensor array is presented for a well apparatus for determining the position of at least one movable component with respect to a fixed component of a downhole tool. The array comprises at least one conductor member having a plurality of contact regions spaced apart at first intervals of at least a first length along a longitudinal axis of said at least one conductor member and a plurality of magnetic sensors, each one of which is operably coupled to one of said plurality of contact regions and actuatable by a magnetic field from a magnetic actuator.
摘要:
The present invention provides a robust, durable and reliable cylindrical valve having closable, radially extending openings for use in cementing, injection, including hydraulic fracturing, and production in wells having high pressures and large pressure differences. The valve may comprise scraping rings in order to remove deposits and the like when it is to be closed after use. Magnets or other suitable means indicates whether the valve is in an open or closed position.
摘要:
An apparatus for selectably isolating a subterranean formation from a production string comprises a radially expandable ring located between upper and lower sleeves and retained at a position to intrude into a central passage extending therethrough. The expandable ring is permitted to radially expand into a recess upon displacement of the lower sleeve to permit a body retained thereon to move therepast. The apparatus includes a pair of inner and outer indexing rings which cooperate to permit the inner and outer indexing rings to move towards a bottom end thereof only to a fixed endwall whereafter further movement of the inner and outer indexing rings and lower sleeve is prevented.
摘要:
Return flow diverters are provided for which are adapted to allow return flow during cementing of a liner for a well. The return flow diverter comprises a cylindrical body adapted for installation in a well as part of the liner. The cylindrical body has a fluid port therein adapted to allow fluids displaced by a cementing operation to flow from an annulus between the liner and the well into the cylindrical body. The return flow diverter also comprises a cover supported on the cylindrical body for movement from an open position, in which the port is open, to a closed position, in which the port is closed by the cover, a transmission disposed within the cylindrical body and defining a cylindrical passageway adapted to accommodate a tubular conduit.
摘要:
A downhole valve assembly (12; 812) is operable to control production fluid flow around an obstruction (10) in a production tubing string (22). The obstruction may be caused by another valve or valve assembly (10) located in the production tubing string (22), where the valve (10) is closed and as such blocks flow through the production tubing (22). The downhole valve assembly (12; 812) comprises a tubular body (300) that includes an axial passage (320) extending through the body (300) and one or more ports (380) extending substantially radially through the body. The downhole valve assembly (12; 812) also includes one or more actuating members (420, 470) that are operable to move relative to the body (300). Movement of the actuating members (420, 470) selectively opens the ports (380) such that a fluid flow path (400, 401) through the ports is defined between an annulus region (23) outside of the valve assembly (12; 812) and the axial passage (320) such that the blockage can be bypassed.