NCS MULTISTAGE INC.

A valve assembly for integration within a wellbore string is provided. The valve assembly includes a valve housing defining a fluid passage therethrough and having injection ports, and a flow restriction component extending between the fluid passage and the injection ports to establish fluid communication therebetween. The flow restriction component is configured to create a flowrate restriction along a flow path length thereof, with each injection port being aligned with respective portions of the flow restriction component to define respective flow path lengths defining respective degrees of flowrate restriction. The valve assembly also includes a flow adjuster connected to the valve housing and being fluid-pressure actuatable to align an outlet with one of the injection ports such that fluid flow between the fluid passage and the reservoir is restricted by a corresponding degree of flowrate restriction to maintain an injection rate substantially constant.

A valve assembly for integration within a wellbore string is provided. The valve assembly has a valve housing with a housing port, a bottom sleeve mounted and slidable within the valve housing between closed and open positions, and a top sleeve mounted within the valve housing and defining an annular region therebetween. The top sleeve has a sleeve port and is slidable within the valve housing between a first position where the top sleeve engages the valve housing and defines an annular chamber within the annular region, and a production position where the sleeve port is in fluid communication with the housing port to define a fluid pathway along which fluids flow from the reservoir through the annular chamber. While in the first position, the annular chamber has an inlet allowing fluid to flow into and pressurize the annular chamber to prevent particulates from flowing into the annular region.

A high force stroker tool for integration within a wellbore string disposed along a wellbore defined within a subterranean reservoir is provided. The stroker tool includes a hydraulic anchor hydraulically operable to deploy slips securable to the wellbore and to define a mechanical brace, a shifting tool operatively coupled to the hydraulic anchor and comprising a mechanical anchor securable to a movable component, the shifting tool being mechanically operable to move the movable component; and an actuator coupled between the hydraulic anchor and the shifting tool, the actuator being hydraulically operable to brace against the mechanical brace and create a downhole mechanical force adapted to mechanically operate the shifting tool. A method of shifting downhole valve assemblies using the high force stroker tool is also provided.

A valve assembly for integration within a wellbore string has a valve housing with a housing port, a bottom sleeve mounted and slidable within the valve housing between closed and open positions, and a top sleeve mounted within the valve housing and defining an annular region therebetween. The top sleeve has a sleeve port and is slidable within the valve housing between a first position where the top sleeve engages the valve housing and defines an annular chamber within the annular region, and a production position where the sleeve port is in fluid communication with the housing port to define a fluid pathway along which fluids flow from the reservoir through the annular chamber. While in the first position, the annular chamber has an inlet allowing fluid to flow into and pressurize the annular chamber to prevent particulates from flowing into the annular region.

There is provided a valve assembly suitable for use in a high temperature well, such as a geothermal well. The valve assembly comprises a tubular housing having ports to allow fluid communication between a fluid passageway in the valve assembly and the outside of the valve assembly, an outer sleeve longitudinally slidable in the tubular housing, and an inner sleeve longitudinally slidable in the outer sleeve. The outer and inner sleeves are slidable to various positions to prevent, allow or restrict flow through the ports. The valve assembly may include sealing assemblies that can withstand high temperatures, frangible plugs in the ports that can be sheared to open the ports, and/or a coupling member for coupling the inner and outer sleeve while the ports are being opened. The valve assembly may have ports configured in a manner that allows for sequential opening of the ports.

Disclosed is a rupture disc assembly for use in making a temporary seal in a vessel such as a casing string. The rupture disc assembly may include a rupture disc having a side surface that has a shallow angle taper inward towards a bottom surface of the rupture disc, and a mounting apparatus to support the rupture disc so that the rupture disc forms the temporary seal. When a disc working pressure is applied to a top surface of the rupture disc, engagement/force transmission between the rupture disc and the mounting apparatus produces enough radial compression in the rupture disc due to the shallow angle taper to significantly mitigate or cancel tensile stresses thereby avoiding the rupture disc from breaking. The rupture disc may be configured to break when the rupture disc is subjected to a disc working pressure that is greater than the disc rupture pressure, thereby removing the temporary seal. An axial abutment surface feature may be provided which is configured and operable to limit downward axial movement of the rupture disc relative to said disc support mechanism and thus be operable to restrict the amount of compression said tapered wall surface of said disc support mechanism can exert on said at least a portion of said rupture disc when the top surface of the rupture disc is subjected to said hydraulic pressure within the well.

A valve assembly for integration within a wellbore string is provided. The valve assembly includes a valve housing defining a fluid passage therethrough and having injection ports, and a flow restriction component extending between the fluid passage and the injection ports to establish fluid communication therebetween. The flow restriction component is configured to create a flowrate restriction along a flow path length thereof, with each injection port being aligned with respective portions of the flow restriction component to define respective flow path lengths defining respective degrees of flowrate restriction. The valve assembly also includes a flow adjuster connected to the valve housing and being fluid-pressure actuatable to align an outlet with one of the injection ports such that fluid flow between the fluid passage and the reservoir is restricted by a corresponding degree of flowrate restriction to maintain an injection rate substantially constant.

Disclosed is a rupture disc assembly for use in making a temporary seal in a vessel such as a casing string. The rupture disc assembly may generally include (A) a rupture disc having a side surface having a shallow taper inward towards a bottom surface of the rupture disc (B) an actuating mechanism including (i) an outer sled having an inner supporting surface forming a taper complimentary to the shallow taper of the side surface, (ii) an inner sled disposed within the outer sled and having a support shoulder to support the bottom surface of the rupture disc and (iii) a securing mechanism and (C) a housing to house the rupture disc and actuating mechanism.

A valve assembly for downhole completion operations and method for using the assembly is described. The valve assembly relies on non-polymeric interfaces between the valve components for sealing the valves without elastomeric materials, thereby making the valve assembly suitable for high temperature well operations, such as 320° C. to 600° C. which are typically encountered in geothermal well operations. The valve assembly includes a first seat which receives an actuating member to actuate the opening of ports in the housing, thereby allowing for fluid injection into the formation adjacent the valve assembly through the ports. A seal assembly suitable for use in high temperature well operations is also described.

A valve assembly suitable for use in a high temperature well, such as a geothermal well. The valve assembly comprises a tubular housing having ports to allow fluid communication between a fluid passageway in the valve assembly and the outside of the valve assembly, an outer sleeve longitudinally slidable in the tubular housing, and an inner sleeve longitudinally slidable in the outer sleeve. The outer and inner sleeves are slidable to various positions to prevent, allow or restrict flow through the ports. The valve assembly may include sealing assemblies that can withstand high temperatures, frangible plugs in the ports that can be sheared to open the ports, and/or a coupling member for coupling the inner and outer sleeve while the ports are being opened. The valve assembly may have ports configured in a manner that allows for sequential opening of the ports.