摘要:
Apparatus and methods are provided for completing a wellbore junction. In one embodiment described herein, a lateral wellbore junction is sealed utilizing an apparatus assembled within the well. The apparatus may include multiple housings which are engaged with each other to form a sealed assembly with flow passages extending into the lateral wellbore, and upper and lower portions of a parent wellbore. Associated sealing devices and flexible couplings are also provided.
摘要:
A bidirectional disappearing plug member and plug assembly is capable of blocking pressurized fluid flow from opposing axial directions in a flowbore. In a preferred embodiment, the plug member, which blocks flow through the flowbore, may be readily and at least partially dissolved through the application of at least one pressurization and depressurization within a tubing string above the plug assembly. Construction of the plug assembly permits the plug member to be conveniently emplaced in a fluid-filled wellbore by permitting fluid flow around the plug member during the emplacement process. The plug member may then be secured within the plug assembly to block fluid flow from either axial direction. Operation of a plug rupture sleeve or mandrel, for at least partially dissolving the plug member, may be controlled by a ratchet assembly or linear indexing apparatus requiring multiple pressurizations and depressurizations before the plug member is exposed to wellbore fluids and thereby at least partially dissolved.
摘要:
A sealed wellbore junction is conveniently and efficiently created in a subterranean well. In one described embodiment, a first assembly including a deflection device is positioned in the well adjacent a junction of parent and lateral wellbores. A second assembly is then sealingly engaged with the first assembly, thereby sealing the junction, and providing fluid communication between the lateral wellbore and upper and lower portions of the parent wellbore. Sealing engagement between the first and second assemblies may be provided by a variety of sealing members, or by metal-to-metal contact between the assemblies.
摘要:
A method and apparatus for establishing and substantially destroying a fluid-type plug which is substantially dissolvable in fluid. A means for selectively opening a fluid port to the plug member is described which causes dissolution of the plug to occur. The plug member is maintained within a plug housing which also contains the fluid port. The plug housing is received within an annular sleeve which serves to seal the plug housing port against fluid intrusion into the plug housing port. The sleeve also contains an aperture which will become generally aligned with the plug housing port as the plug housing is axially separated from the annular sleeve. Axial separation of the plug housing and sleeve is accomplished by selectively pressurizing and depressurizing the flowbore containing the plug assembly to remove support for the plug housing.
摘要:
Improved methods and systems for creating a multilateral well and improved multilateral well structures. In one aspect of the present invention, the method comprises the steps of: (1) setting a diverter at a prescribed position and a prescribed orientation in a main well flow conductor located within a main wellbore, (2) boring through a sidewall of the main well flow conductor and into a material surrounding the main well flow conductor, the boring creating a window having a particular shape in the sidewall, the orientation of the diverter determining a lateral position of the window in the main well flow conductor, a lateral wellbore thereby being formed in the material and extending from the main wellbore, (3) lining the lateral wellbore with a liner, the liner having an interface end, the interface end adapted to contact a periphery of the window in the sidewall and (4) cementing the liner in place within the lateral wellbore, the step of cementing creating a pressure-bearing seal between the periphery of the window and the interface end of the liner. The method allows multiple lateral wellbores to be joined to the main wellbore and provides for connectivity among main and lateral wellbores, pressure-bearing sealing of joints to allow selective isolation of one or more wellbores or portions thereof and subsequent wellbore access for rework or other purposes.
摘要:
A well control valve assembly prevents flow from or to completion segments further downhole from the well control valve assembly once the stimulation stimulation/shifter string has been removed from the production tubing string. The well control valve assembly features a shaped flapper plate which, when opened, conforms closely to the shape and size of the production tubing string's interior diameter. The flapper plate is biased toward a closed position by a compression spring arrangement that includes an arm which levers the plate upward toward a seating surface. The valve assembly's closure is mechanically induced and is not responsive to a sensed well condition.
摘要:
A drilling template for multiple wells has a dummy post on the template associate with each wellhead position and a wellhead connector is transferable between the dummy post and wellhead during completion and workover operations. A subsea wellhead is provided with a guide frame on which a dummy post is supported permitting the wellhead connector to be transferred between the dummy post and the wellhead. The wellhead includes a landing nipple and tubing hanger which permit the tubing hanger to tilt relative to the casing head without breaking the seal between the hanger and nipple. The wellhead connector is latched and released from the tubing head by reciprocation of a control sleeve and the connector is held in the unlatched position by a releasable lock. The wellhead connector includes a plug having a metal seal held in compression together with a resilient seal.
摘要:
A well system and method for completing petroleum oil and gas wells having special application to extreme environmental settings such as platform, sub sea, and floating vessel operations, and wells in frozen regions such as the Arctic, and the like. The invention is characterized by structure effectively defining a downhole wellhead including weight supporting apparatus in which the tubing hanger is supported and a pack-off with the casing for minimizing the effects of structural damage at the surface end of the well system. The system includes a tubing hanger releasably lockable in a casing at a downhole location and having sealing means for sealing the annulus within the casing around the hanger, a valve package lock releasably lockable in the tubing hanger, tubing strings connected with the valve package lock and extending upwardly therefrom, including tubing valves, a safety joint connected with the tubing strings above the valves, tubing strings connected with the safety joint extending upwardly to a tubing head at the wellhead, control fluid conduits connected from the tubing head through the safety joint to the valve package lock and tubing hanger for manipulation of the system during various phases of operation, and a composite handling string for running and pulling the well system including either of a slip joint or a hydraulic stop and orienting tool. The system permits a downhole wellhead to be functionally created below the mudline of offshore wells, Arctic wells, and the like.
摘要:
A jumper tube for use with a shunt tube assembly comprises a first tubular member configured to engage a first shunt tube, a second tubular member axially disposed within the first tubular member, and a locking member configured to prevent the second tubular member from axially displacing into the first tubular member. The second tubular member is configured to slidingly engage within the first tubular member, and the second tubular member is configured to engage a second shunt tube.
摘要:
A flow control system for use in a subterranean well can include a flow chamber through which a fluid composition flows, and a plug which is released in response to an increase in a ratio of undesired fluid to desired fluid in the fluid composition. Another flow control system can include a flow chamber through which a fluid composition flows, a plug, and a structure which supports the plug, but which releases the plug in response to degrading of the structure by the fluid composition. Yet another flow control system can include a flow chamber through which a fluid composition flows, and a plug which is released in response to an increase in a velocity of the fluid composition in the flow chamber.