Abstract: An apparatus for use in a well borehole packing operation takes the form of a downhole packer and comprises a body and a seal member. In use, the apparatus is run into a borehole as part of a downhole completion assembly. On reaching the desired location, the apparatus is activated to urge the seal member into sealing engagement with the borehole, and thereby isolate an annular region between the apparatus and the borehole. A conduit is disposed within the body and is offset from a central longitudinal axis of the apparatus, the conduit configured to transport a borehole packing material, such as gravel slurry, through the apparatus.

Abstract: A technique facilitates dehydration of gravel slurry around blank pipe sections of a completion having filters for receiving carrier fluid returns. A sand screen filter system may be assembled with a first filter, a second filter, and a blank pipe section extending between the first filter and the second filter. A fixed leak off tube is mounted to the sand screen filter system such that at least a portion of the fixed leak off tube overlaps the first filter. Additionally, a slidable leak off tube is slidably mounted to the sand screen filter system. The slidable leak off tube is oriented to enable the slidable leak off tube to be slid along the blank pipe section until secured in fluid communication with the fixed leak off tube.

Abstract: A method for removing filter cake from a subterranean wellbore includes running a completion string into the wellbore on production tubing, the completion string including one or more screen assemblies coupled therein, conveying a running tool through the production tubing to a shifting tool arranged within the completion string, opening a circulation port of the shifting tool with the running tool, flowing a spotting fluid through the running tool and the shifting tool and discharging the spotting fluid from the completion string into an annulus defined between the completion string and the wellbore, interacting the spotting fluid with the filter cake to remove the filter cake from a wall of the wellbore, and circulating the spotting fluid from the annulus and into the production tubing through the circulation port.

Abstract: A gravel pack system has a heel section and a toe section that is downhole from the heel section. The system also includes a conveyance having an interior passageway for fluid flow to the toe section, a closing sleeve that forms an annulus with the conveyance, a shunt having a first section that provides a fluid flow entrance into the shunt, a second section that extends to the heel section along the gravel pack system, and one or more nozzles along the second section that provides fluid flow out of the gravel pack system at the heel section, and a shroud having a first section that is coupled to the closing sleeve and a second section that is coupled to the shunt, where the shroud and the conveyance form a second annulus.

Abstract: A system for a wellbore can include a tubing string positioned downhole in a wellbore and a porous gravel pack. The porous gravel pack can be positioned in an annulus defined at least in part by a surface of the tubing string. The porous gravel pack can be made up of a plurality of grains. Each grain can include a core surrounded at least in part by a sheath. The core can comprise an expandable material that can expand in response to coming in contact with a fluid. The sheath can surround the core and can be deformable in response to the core expanding in response being exposed to a fluid.

Abstract: Disclosed herein are aspects of an expandable metal wellbore anchor for use in a wellbore. The expandable metal wellbore anchor, in one aspect, includes one or more expandable members positionable on a downhole conveyance member in a wellbore, wherein the one or more expandable members comprise a metal configured to expand in response to hydrolysis, and wherein a combined volume of the one or more expandable members is sufficient to expand to anchor one or more downhole tools within the wellbore in response to the hydrolysis.

Abstract: Simulating fluid flow in a fractured reservoir includes generating a grid for a fractured reservoir model that includes a fracture and a matrix to obtain a generated grid. Cross-flow equilibrium elements are generated based on the generated grid. A volume expansion parameter is selected for the cross flow equilibrium elements, and used, along with physical properties, pore volume and transmissibility multipliers. The physical properties are included in the cross flow equilibrium elements. A fluid flow in the fractured reservoir model is simulated using the pore volume and transmissibility multipliers and a fracture relative permeability curve to obtain a result, which is presented. The fluid flow is calculated for the cross flow equilibrium elements.

Abstract: A method of gravel packing an open hole penetrating a subterranean information includes installing at least one sand control screen disposed about a tubular member into the open hole, circulating a slurry including an expandable gravel and a carrier fluid, depositing the slurry in the wellbore annulus surrounding the at least one sand control screen in an alpha wave beginning at a heel of the wellbore annulus, detecting at least one of: arrival of the alpha wave at a toe of the wellbore annulus and start of a beta wave at the toe of the wellbore annulus, stopping circulation of the slurry, and triggering the expandable gravel to expand to pack the wellbore annulus surrounding the at least one sand control screen above the alpha wave.

Abstract: A centralizer for a downhole probe disposed within a pipe, the centralizer having a two spaced apart primary tubular members, each with three or more centralizer strip assemblies spaced circumferentially about the wall of the primary tubular member to form seats at each end of each strip assembly. Each seat is disposed to engage a connecting rod assembly extending between the two spaced apart primary members. Each connecting rod assembly has an inner portion and an outer portion, wherein the inner portions of the connecting rod assemblies engage the outer diameter of a probe and the outer portions of the connecting rod assemblies engage the inner diameter of a pipe.

Abstract: A method of plugging a section of a wellbore wall includes sending a plug injection tool to a downhole location proximate the section of the wellbore wall, setting a first seal below the section of the wellbore wall using the plug injection tool, and setting a second seal above the section of the wellbore wall using the plug injection tool. A plugging material is pumped between the first and second seals and held there until it solidifies.

Abstract: Optical fiber connections and their applications in downhole assemblies are described herein. The downhole assembly includes a well completion element with an end that couples with a corresponding well completion element. An optical fiber extends along at least a portion of the well completion element and transmits an optical signal using a first mode. The well completion element includes an optical fiber connector that is coupled to the optical fiber. The connector also includes a mode converter that receives the optical signal from the optical fiber and converts the optical signal from the first mode to a second larger mode. This second larger mode may be more robustly communicated to a corresponding optical fiber connector affixed to the corresponding well completion element.

Abstract: A technique facilitates actuation of a downhole device, such as an isolation valve. According to an embodiment, the downhole device may be in the form of an isolation valve member, e.g. a ball valve element, actuated between positions by a mechanical section which may comprise a shifting linkage. Actuation of the mechanical section, and thus actuation of the isolation valve member, is achieved by a trip saver section controlled according to a pressure signature which may be applied from a suitable location, e.g. from the surface. The trip saver section comprises a housing having an internal actuation piston coupled with the mechanical section. The trip saver section further comprises a pilot piston and a plurality of chambers formed in a wall of the housing and arranged to enable shifting of the actuation piston in response to a predetermined series of pressure pulses or other suitable pressure signature.

Abstract: A completion assembly to aid in gravel packing a wellbore which assembly includes a plurality of interconnected sand screen assemblies, each sand screen assembly having a wireless adjustable electronic flow control node disposed along the sand screen base pipe to control flow of a gravel packing slurry from the base pipe into the wellbore annulus. Each electronic flow control node includes a valve that can be adjusted by an electric actuator powered by a power harvesting mechanism disposed in a flow path of the completion assembly. A wireless transmitter receives a control signal to control the electric actuator. The control signal may be transmitted sequentially from a distal most sand screen assembly to a proximal sand screen assembly in order to sequentially build the gravel pack.

Abstract: Systems and methods for producing energy from a geothermal formation. A heat exchanger can be disposed within a well to absorb heat from a geothermal formation. The heat exchanger can be supported within the well using a high thermal conductivity material. The heat exchanger is connected to an organic Rankine cycle engine including a secondary heat exchanger and a turbine. The primary and secondary heat transfer fluids are chosen to maximize efficiency of the organic Rankine cycle.

Abstract: Method is provided for preventing fluid from entering a well, such as a producing well, during a hydraulic fracturing treatment in another well completed in the same reservoir. Degradable ball sealers or degradable particulate material is injected into the well and pressure is maintained in the well during the fracturing treatment to prevent influx of fluid.

Abstract: A firing head assembly may include a tubular housing; a valve slidably disposed within the tubular housing; a lock mandrel disposed in the tubular housing between the valve and the tubular housing second end; a firing pin holder disposed in the tubular housing between the lock mandrel and the tubular housing second end; an engagement mechanism operably contacting the lock mandrel and the firing pin holder latch. The valve may have a piston end exposed to the lumen. The lock mandrel may be restrained from axial movement by a shear element. The firing pin holder may include a firing pin and latch. The engagement mechanism may be switchable between an engaged arrangement and a disengaged arrangement. The engagement mechanism may be configured to transition from the engaged arrangement to the disengaged arrangement in response to an axial movement of the lock mandrel.

Abstract: A method for shutting off a wet interval of a wellbore includes producing hydrocarbons from a hydrocarbon bearing subterranean formation through a production string installed in the wellbore, identifying the wet interval of the wellbore, perforating the production string in the wet interval using an explosive-free punch tool to produce a plurality of openings in the production string, isolating the production string in the wet interval, treating the wet interval with a sealing composition injected through the plurality of openings into an annulus of the wellbore in the wet interval, and restoring a fluid flow path through the production string in the wet interval. The restored fluid flow path through the wet interval enables continued production of hydrocarbons from downhole intervals, while the sealing composition cured in the annulus provides a barrier to prevent fluid flow from the wet interval into the production string.

Abstract: A multi-zone, one trip completion system for a wellbore is described. A plurality of isolation packers is installed in borehole to isolate a plurality of zones of the annulus between a tubing string and a wellbore. Each tubing string section is positioned in a zone and comprises a selectively openable stimulation port to provide stimulation fluid to its zone and a selectively openable production port to receive fluid from its zone. The system also comprises a circulation system with a plurality of circulation tubes and circulation tube valves, being configurable in a plurality of configurations to selectively connect, via a circulation flow path, the central bore or the borehole annulus of a wellbore at each of the plurality of sections, to an upper circulation flow path open to an annulus above an uppermost of the plurality of isolation packers.

Abstract: Formulations for fracturing fluids that include (i) a fluid (D) including an oil phase in which the fluid (D) is an inverse emulsion including a water-soluble polymer (B) and said oil phase; and (ii) particles of a water-soluble polymer (C), which are different than water-soluble polymer (B), wherein the particles of polymer (C) are dispersed in said oil phase as solid discrete particles. The fluid (D) includes at least 15wt % polymer (B).

Abstract: Accordingly, this disclosure describes systems, compositions, and methods that may use pelletized diverting agent particulates for diversion, fluid loss control, and/or other subterranean treatments for controlling fluid flow in subterranean formations. In an embodiment, a method comprising: introducing a treatment fluid into a wellbore penetrating a subterranean formation wherein the treatment fluid comprises: a base fluid; a pelletized diverting agent comprising a degradable polymer, wherein the pelletized diverting agent at least partially plugs a zone in the subterranean formation; and diverting at least a portion of the treatment fluid and/or a subsequently introduced fluid away from the zone. In an embodiment, a treatment fluid comprising: a base fluid; and a pelletized diverting agent comprising a degradable polymer.

Abstract: A gravel packing apparatus includes a base pipe defining an interior fluid conduit, the base pipe having a production section configured to provide fluid communication between an exterior of the base pipe and an interior of the base pipe, the base pipe having a blank section. The apparatus also includes a screen surrounding the production section, the screen in fluid communication with an annular region of a borehole and configured to prevent particulate matter from passing therethrough, and a filtration assembly disposed proximate to the blank section, the filtration assembly including a fluid passage extending between an exterior of the blank section and an interior of the blank section.

Abstract: The disclosed embodiments include gravel pack assemblies, method to bypass a fluid restrictor during gravel packing operations, and methods to control fluid flow during and after gravel packing operations. In one embodiment, a gravel pack assembly including a flow restrictor that is coupled to a downhole string that is deployed in a borehole is disclosed. The flow restrictor forms a first fluid passageway from the borehole to an internal cavity of the string. The gravel pack assembly includes a fluid bypass portion having a first chamber, a sealing member inserted into the first chamber; and an actuation assembly operable to actuate the sealing member. The fluid bypass portion forms a second fluid passageway from the borehole to the internal cavity of the downhole string prior to actuation of the actuation assembly. After actuation of the actuation assembly, fluid flow through the second fluid passageway is restricted by the sealing member.

Abstract: Various embodiments provide methods and systems for providing fluid lighteners for use in downhole wells. The fluid lighteners may include one or more viscosifiers, one or more aphron generators, and a location-specific non-emulsifying surfactant.

Abstract: Simulating fluid flow in a fractured reservoir includes generating a grid for a fractured reservoir model that includes a fracture and a matrix to obtain a generated grid. Cross-flow equilibrium elements are generated based on the generated grid. A volume expansion parameter is selected for the cross flow equilibrium elements, and used, along with physical properties, pore volume and transmissibility multipliers. The physical properties are included in the cross flow equilibrium elements. A fluid flow in the fractured reservoir model is simulated using the pore volume and transmissibility multipliers and a fracture relative permeability curve to obtain a result, which is presented. The fluid flow is calculated for the cross flow equilibrium elements.

Abstract: A technique facilitates formation of a gravel pack along relatively lengthy wellbores. According to an embodiment, a completion system comprises a plurality of screen assemblies. The completion system also has an alternate path system disposed along the plurality of screen assemblies. The alternate path system includes shunt tubes, e.g. transport tubes, coupled together by jumper tubes. An anti-buckling structure is coupled to each jumper tube to prevent buckling when high operational pressures, e.g. operating pressures of 9000 psi or higher, are applied to the alternate path system.

Abstract: A technique facilitates formation of a gravel pack along relatively lengthy wellbores. According to an embodiment, a completion system comprises a screen assembly and an alternate path system disposed along the screen assembly. The alternate path system may include a transport tube and a packing tube placed in fluid communication at a manifold. The manifold is disposed along the screen assembly. In some embodiments, the completion system may comprise multiple screen assemblies with multiple corresponding manifolds. The packing tube is protected against erosion by a liner and a surrounding housing which are positioned to conduct fluid flow from the manifold as fluid flow moves from the transport tube, through the manifold, and into the packing tube during a gravel packing operation.

Abstract: A technique facilitates a gravel packing operation in a well. The system may utilize a Y-manifold having a manifold body through which or along which a gravel slurry may be flowed. A plurality of exit end shunt connectors extends from the manifold body to enable connection with corresponding exit end shunt tubes at a position separated from the manifold body. Additionally, a plurality of entrance end shunt connectors extends from the manifold body in a direction generally opposite the exit end shunt connectors. The extended entrance end shunt connectors enable connection with corresponding entrance end shunt tubes at a position separated from the manifold body.

Abstract: A fluid control device includes a support structure configured to be deployed in a borehole and a filtration component disposed at the support structure. The filtration component includes a porous medium made from a shape memory epoxy, the shape memory epoxy including a soft segment monomer and a hard segment monomer, the porous medium configured to be compacted from an initial shape to a compacted shape, deployed in the borehole, and subsequently expanded due to a downhole temperature to conform to a surface of the borehole.

Abstract: A flow diverter for connecting a central bore to an outer conduit. The flow diverter defines a portion of the central bore and angled flow passages connecting the portion of the central bore to the outer conduit. Rounded edges between the central bore and angled flow passages reduce cavitation and/or turbulence. The rounded edges and an adjacent portion of the central bore may be defined by an insert.

Abstract: There is provided a method for well construction comprising the steps of: a first phase of the well construction, in which a bottom hole assembly, BHA, with a first drill is used for drilling, and a conductor casing is lowered into the well and cemented; a second phase of the well construction, in which a second drill is used for drilling, wherein a production adapter base, PAB, is installed in parallel with lowering a blowout preventer, BOP; and a third phase of the well construction in which a third drill is used for drilling, for the steps of landing and geonavigation inside a reservoir.

Abstract: A wellbore completion system includes an expandable liner hanger with a post-setting fluid flow path. The system includes an expandable liner hanger that can be expanded by a running tool prior to a completion operation in a wellbore. The system also includes a circulating sleeve that can be manipulated by the running tool. The circulating sleeve can provide a return path for fluid internal to the expandable liner hanger for the completion operation that is performed subsequent to releasing the running tool from the expandable liner hanger.

Abstract: Insulating fluids for use in drilling, production, and other applications are provided, the insulating fluids containing a porous medium (such as a sponge or foam) to limit the mobility of the liquid phase of the insulating fluid. The porous medium in the insulating fluid provides a mechanical means for reducing convective heat transfer, as the small pore spaces within the porous media create tortuous paths for the liquid moving therethrough. Methods include introducing the insulating fluid into an annulus of a drilling, riser, production, packer, or pipeline assembly to reduce heat transfer therethrough.

Abstract: A chemically-activated inflow control device. The inflow control device comprises a tubular body configured to be connected in series to joints of sand screen in a wellbore. The tubular body forms a bore that receives a slotted base pipe. At the same time, the tubular body is fluidly connected with the sand screen joints, forming an annular flow path between the slotted base pipe and surrounding sand screen. Production fluids moving into the sand screen pass across a component that degrades in the presence of water. If the well begins producing water, the degradable component will dissolve, activating a sealing mechanism within the inflow control device and closing a restricted flow path. In this way, production fluids are not able to travel from the annular flow path into the bore of the slotted base pipe. A method for completing a wellbore having a chemically-activated inflow control device is also provided.

Abstract: Chelating acid blends for stimulation of a subterranean formation, methods of utilizing the chelating acid blends, and hydrocarbon wells that include the chelating acid blends are disclosed herein. The chelating acid blends include an acid mixture and a chelating agent or set of chelating agents. The acid mixture includes hydrochloric acid and hydrofluoric acid. The methods include providing the chelating acid blends to a wellbore of a hydrocarbon well, flowing the chelating acid blends into a subterranean formation, dissolving a fraction of a formation mineralogy of the subterranean formation with the acid mixture, and chelating poly-valent metal ions with the chelating agent. The hydrocarbon wells include a wellbore that extends within a subterranean formation, a downhole tubular that extends within the wellbore, a fracture that extends into the subterranean formation, and a chelating acid blend positioned within the fracture.

Abstract: A tool comprising a movable sleeve with an inner diameter, an outer diameter, and a screen. The screen being configured to filter materials flowing into a first port within the moveable sleeve, wherein the outer diameter of the movable sleeve is positioned adjacent to an inner diameter of the tool, wherein the screen is configured to move with the moveable sleeve. The tool further comprising a temporary member positioned on the inner diameter of the moveable sleeve, the temporary member being configured to temporarily cover an inner sidewall of the screen.

Abstract: Method is provided for preventing fluid from entering a well, such as a producing well, during a hydraulic fracturing treatment in another well completed in the same reservoir. Degradable ball sealers or degradable particulate material is injected into the well and pressure is maintained in the well during the fracturing treatment to prevent influx of fluid.

Abstract: A completion system apparatus having a body comprising a throughbore and lateral flow ports for providing access through a wall of the body and a valve arrangement including a first, uphole, valve assembly and a second, downhole, valve assembly. The valve arrangement is configurable between a first, open, configuration in which passage of fluid through the axial throughbore is permitted and a second, activated, configuration, the valve arrangement in the second, activated, configuration preventing passage of fluid in the first, downhole, direction so as to direct the fluid through the lateral flow ports while permitting the passage of fluid through the apparatus in a second, uphole, direction so as to permit return passage of the fluid through the apparatus. A bypass arrangement is configured to permit fluid travelling in the second direction to bypass the first valve assembly.

Abstract: The present disclosure provides a particle-based fluid simulation method using multiple processors which is performed in a fluid simulation apparatus, including modeling a simulation region including multiple particles for a fluid, dividing the simulation region into multiple sub-regions, allocating each of the multiple processors to each of the multiple sub-regions, calculating, by each of the multiple processors, flow data of multiple particles for a sub-region corresponding to each of the multiple processors, and performing a fluid simulation based on the result of the calculation. The calculating, by each of the multiple processors, flow data of multiple particles for a sub-region corresponding to each of the multiple processors includes exchanging, by each of the multiple processors, the flow data of the multiple particles with at least one adjacent processor.

Abstract: A completion assembly to aid in gravel packing a wellbore which assembly includes a plurality of interconnected sand screen assemblies, each sand screen assembly having a wireless adjustable electronic flow control node disposed along the sand screen base pipe to control flow of a gravel packing slurry from the base pipe into the wellbore annulus. Each electronic flow control node includes a valve that can be adjusted by an electric actuator powered by a power harvesting mechanism disposed in a flow path of the completion assembly. A wireless transmitter receives a control signal to control the electric actuator. The control signal may be transmitted sequentially from a distal most sand screen assembly to a proximal sand screen assembly in order to sequentially build the gravel pack.

Abstract: A variety of methods, compositions, and systems are disclosed, including, a method comprising: introducing a treatment fluid into a wellbore penetrating a subterranean formation wherein the treatment fluid comprises: a base fluid; and multi-grade diverting particulates, wherein the multi-grade diverting particulates comprise a degradable polymer, wherein the degradable polymer comprises a first portion of the degradable polymer and a second portion of the degradable polymer of different grades, wherein the multi-grade diverting particulate at least partially plugs a zone in the subterranean formation; and diverting at least a portion of the treatment fluid and/or a subsequently introduced fluid away from the zone.

Abstract: A method of designing a particle size distribution of particulate bridging lost circulation material for a fractured leakage includes the following steps: classifying the lost circulation materials according to a particle size; calculating an expected range of a characteristic particle size of the lost circulation materials according to a fracture width and particle size selection criteria; setting a relative percentage content of the each level of the lost circulation materials; using a particle size distribution function to fit a particle size distribution curve; calculating the characteristic particle size of the lost circulation materials according to the particle size distribution curve; determining whether the calculated characteristic particle size conforms to the expected range of the characteristic particle size; and generating the particle size distribution of the lost circulation materials conforming to the particle size selection criteria.

Abstract: A downhole completion system and methodology is provided for use in a well. The downhole completion comprises a packer and a plurality of flow control sand screens. Each flow control sand screen has an inflow control device (ICD). The downhole completion further comprises at least one lower sand screen positioned below the plurality of flow control sand screens. The at least one lower sand screen is configured without an ICD. A flow restrictor is disposed between the plurality of flow control sand screens and the at least one lower sand screen.

Abstract: A method of placing compressible particles within a wellbore. The method first comprises accessing a wellbore. The wellbore has a first string of casing and a second string of casing, wherein the first string of casing surrounds an upper portion of the second string of casing, forming a trapped annulus. The method further includes pumping a fluid mixture down the second string of casing and back up the annulus. The fluid mixture comprises an aqueous carrier fluid having a plurality of compressible particles dispersed therein. Each of the compressible particles is fabricated to collapse in response to fluid pressure within the trapped annulus. The method additionally includes pumping cement into at least a lower portion of the annulus behind the fluid mixture, forming a column of cement, and thereby placing the fluid mixture in the annulus above the column of cement.

Abstract: A technique facilitates performance of a gravel packing operation and desired zonal isolation. An apparatus, e.g. a sliding sleeve shunt tube isolation valve, may be deployed downhole and configured to facilitate a gravel packing operation and zonal isolation. By way of example, the apparatus contains a conduit which in an open position allows the flow of gravel pack slurry and in a closed position creates a barrier. In the closed position, upper and lower portions of the conduit are isolated from one another. When the apparatus is coupled with a packer and sand screens, the apparatus serves to create complete zonal isolation in, for example, an open hole alternate path system.

Abstract: A new tool and methodology to work, in a single-trip system, and create conduits through the casing or tubing to access the annuli, circulate out the annuli contents, accurately deliver the cement required to create the subsequent barrier. The tool and system provide a cost effective way of plugging an oil and gas well in a single trip without the need to remove in-place production casing.

Abstract: A lost circulation material (LCM) that includes spheres having radially distributed and substantially-straight protrusions to facilitate engagement (such as interlocking and entanglement) of the spheres, and methods of preventing lost circulation using the spheres. Each sphere has a plurality of protrusions to contact protrusions of adjacent spheres. The spheres may form plugs in channels, fractures, and other openings in a lost circulation zone. Additionally or alternatively, the spheres may form a bridge on which other LCMs may accumulate to seal openings in a lost circulation zone.

Abstract: An apparatus for use in a wellbore for performing a treatment operation is disclosed that in one non-limiting embodiment may include an inner string that further includes a first tubular having a first communication link, and a service tool including a cross-over tool having a fluid flow passage therein for supplying a treatment fluid under pressure from an inside of the service tool to an outside of the service tool, and wherein the service tool includes a second communication link operatively coupled to the first communication link and wherein the second communication link runs across or through the fluid flow passage in the cross-over tool that is protected from direct flow of the fluid under pressure from the inside of the service tool to the outside of the service tool.

Abstract: Provided is a packer plug. The packer plug, in this example, may include an engagement member having a no go feature configured to engage a no go shoulder of an associated packer assembly. The packer plug, in the example, further includes a nose cone having one or more nose cone openings coupled proximate a downhole end of the engagement member, and a check valve coupled proximate the engagement member. The check valve, engagement member, and nose cone, in this example, create a fluid path between a lower end and an upper end of the packer plug. Further to this example, the check valve is configured to allow downhole fluid to pass uphole through the fluid path as the packer plug is being pushed downhole, but substantially prevent uphole fluid from passing downhole through the fluid path as the packer plug is being pulled uphole.

Abstract: A downhole tool comprises a hollow body having a wall and a port in the wall, and a closing sleeve movable relative to the body to open and close the port. A seal is provided between the body and the sleeve and is configured to hold differential pressure. An isolation member may be deployed in the tool to isolate the seal from differential pressure and close the port. The isolation member may be deployed following initiation of a tool activation process, a successful outcome of the process being translating the closing sleeve and closing the port, and positioning the seal to hold a differential pressure. If it is detected that the outcome has not been achieved, the isolation member is deployed to isolate the seal from differential pressure and close the port.

Abstract: A composition for use as a pressure-tolerant dual-crosslinker gel in a fracturing fluid that comprises polymer, the polymer operable to increase the viscosity of a fluid; boron-containing crosslinker, the boron-containing crosslinker operable to crosslink the polymer; and a transition metal oxide additive, the transition metal oxide additive operable to crosslink the polymer.