Abstract: Downhole tool positioning systems and methods are disclosed which employ buoyancy-mediated tool displacement wherein the density of the tool or string connected to it, and the treatment fluid are matched to facilitate hydraulic translation of the tool in a deviated borehole or lateral with or without a mechanical translation device.

Abstract: A bridge plug with a selectively blocked flow passage is delivered on wireline and pumped down to the desired location and set. A casing pressure test can be performed above the bridge plug while shielding the formation below from excess pressure from the pressure test. To the extent there are producing zones below the bridge plug or adjacent injection wells that could communicate with the borehole, the plug isolates those pressures from below. After the pressure test is completed, a rupture disc is blown in a passage through the bridge plug and flow is then used to deliver completion equipment to a horizontal portion of the borehole and preferably on wireline.

Abstract: A fluid injection device (18) for controlling injection of fluid into an oil-carrying tube in an oil well includes an inlet (20) for receiving the fluid; an outlet (28) for supplying the fluid for injection into the oil-carrying tube; an inlet valve (22) in a fluid path between the inlet and the outlet; an actuator (24) for opening and closing the valve; and a connector (36) for coupling the inlet to a fluid supply tube (32) extending between the device and a source of the fluid above the ground. A method of controlling injection of fluid using such a device is also provided.

Abstract: A method of installing a pressure transducer in a borehole to measure the fluid prepare of a geological formation. The pressure transducer is installed into the borehole at a desired depth, and then the borehole is filled with a cement grout. The fluid connection between the pressure transducer and the formation is opened by pumping a fluid through tubing to displace the cement grout. A process of hydrofracture can be employed to provide a communication path of fluid between the formation and the pressure transducer surrounded by the fractured grout. In one embodiment of the invention, a pressure transducer is cemented into the borehole along with a check and pressure relief valve. In another embodiment, the pressure transducer is installed in the tubing at a subsequent stage.

Abstract: Particulate polymeric materials may be added to a cement slurry to adjust the linear thermal-expansion coefficient of the set cement. The coefficient of the set cement is optimized by considering the linear thermal-expansion coefficient of the casing, as well as the mechanical properties of the formation rock. When placed in a subterranean well having at least one casing string, cement sheaths with optimal linear thermal-expansion coefficients may be subjected to lower compressive and tensile stresses during downhole-temperature changes. Such cement slurries are particularly advantageous in the context of thermal-recovery wells.

Abstract: An end ring having a first ring with an inner diameter, a second ring with the inner diameter and a thickness 25 percent greater than the first ring; a shoulder with a sloped outer surface connecting the first ring to the second ring; a plurality of flutes formed in an outer surface of the end ring, a plurality of fastener holes formed in the first and second rings, wherein the end ring either slides over a first end of a base pipe and fastens together the base pipe and edges of a rubber tubular surrounding the base pipe; or slides over a first end of a frac tubular and fastens edges of a frac sleeve to the frac tubular. The invention includes a swell packer and a frac tubular having the end rings.

Abstract: A wellbore isolation device comprises: a first layer, wherein the first layer: (A) comprises a first material; and (B) defines a cavity containing a dissolution medium, wherein a chemical reaction of at least the dissolution medium causes at least a portion of the first material to dissolve. A method of removing the wellbore isolation device comprises: introducing the wellbore isolation device containing the dissolution medium into the wellbore; and allowing the chemical reaction to occur.

Abstract: A method of cementing a tubular string in a wellbore includes: deploying the tubular string into the wellbore; pumping cement slurry into the tubular string; launching a cementing plug after pumping the cement slurry; propelling the cementing plug through the tubular string, thereby pumping the cement slurry through the tubular string and into an annulus formed between the tubular string and the wellbore; and controlling flow of fluid displaced from the wellbore by the cement slurry to control pressure of the annulus.

Abstract: A system for use with a well having multiple zones can include multiple well screens which filter fluid flowing between a completion string and respective ones of the zones, at least one optical waveguide which senses at least one property of the fluid as it flows between the completion string and at least one of the zones, multiple flow control devices which variably restrict flow of the fluid through respective ones of the well screens, and multiple pressure sensors which sense pressure of the fluid which flows through respective ones of the well screens. A completion string for use in a subterranean well can include at least one well screen, at least one flow control device which selectively prevents and permits substantially unrestricted flow through the well screen, and at least one other flow control device which is remotely operable, and which variably restricts flow through the well screen.

Abstract: A method of removing an unexpanded shoe comprises disposing a tool in a wellbore. The tool includes a latch assembly and a mill body. The latch assembly is engaged with a shoe assembly that is coupled to the wellbore by a tubular having an expanded portion and an unexpanded portion. The mill body is rotated relative to the latch assembly so as to mill the unexpanded portion of the tubular until the shoe assembly is uncoupled from the wellbore. The tool and the shoe assembly are then pulled through the expanded portion and out of the wellbore.

Abstract: An apparatus for use in stage-cementing an oil well in the region of a lost-circulation zone that is proximate an annular space defined by the lower end of an outer casing surrounding an inner casing include a load-bearing annular steel plate of substantial thickness that is positioned on, and maintained stationary relative to the inner casing by supporting and retaining means secured to the inner casing, the outer diameter of the plate being less than the inside diameter of the outer casing so that the plate can be lowered with the inner casing string to the desired location inside of the outer casing and, with a layer of gravel, to provide a seal and support the cement poured into the annulus between the inner and outer casings.

Abstract: A pourable aqueous cement composition is disclosed. The cement composition comprises a hydraulic cement, water and a selectively removable material comprising a plurality of selectively corrodible metal powder particles dispersed within the cement or a nanomatrix powder compact, or a combination thereof. An article, including a downhole article, and more particularly a reconfigurable downhole article is disclosed. The article includes a hydraulic cement, wherein the hydraulic cement has at least partially set into a permanent form. The article also includes a selectively removable material dispersed within the cement, the selectively removable material comprising a plurality of selectively corrodible metal powder particles dispersed within the cement or a nanomatrix powder compact, or a combination thereof, wherein the selectively removable material is configured for removal in response to a predetermined wellbore condition.

Abstract: In an embodiment, the cement compositions comprise: (i) hydraulic cement, wherein the hydraulic cement has a ratio of CaO to SiO2 in the range of 2.0 to 4.0; and (ii) a water-soluble metaphosphate in a concentration of at least 2.5% bwoc. In another embodiment, the cement compositions comprise: (i) hydraulic cement, wherein the hydraulic cement has a ratio of CaO to SiO2 of less than 2.0; and (ii) a water-soluble metaphosphate; wherein any alkali nitrate is in a concentration of less than 2% bwoc; and wherein any alkali hydroxide, alkali carbonate, or alkali citrate is in a concentration of less than 0.2% bwoc. Methods of cementing in a well comprising forming either of such cement compositions and introducing it into the well are provided.

Abstract: A running tool for deploying a tubular string into a wellbore includes a tubular body and a latch for releasably connecting the tubular string to the body. The latch includes a longitudinal fastener for engaging a longitudinal profile of the tubular string and a torsional fastener for engaging a torsional profile of the tubular string. The running tool further includes a lock movable between a locked position and an unlocked position and the lock keeps the latch engaged in the locked position. The running tool further includes an actuator operable to at least move the lock from the locked position to the unlocked position and an electronics package in communication with the actuator for operating the actuator in response to receiving a command signal.

Abstract: A plug release system for cementing a tubular string into a wellbore includes: a wiper plug; a tubular housing; a latch for releasably connecting the wiper plug to the housing. The latch includes: a fastener engageable with one of the wiper plug and the housing; a lock movable between a locked position and an unlocked position, the lock keeping the fastener engaged in the locked position; and an actuator connected to the lock and operable to at least move the lock from the locked position to the unlocked position. The plug release system further includes an electronics package disposed in the housing and in communication with the actuator for operating the actuator in response to receiving a command signal.

Abstract: In one embodiment, a ball release system for use in a wellbore includes a tubular housing, a seat disposed in the housing and comprising arcuate segments arranged to form a ring, each segment radially movable between a catch position for receiving a ball and a release position, a cam disposed in the housing, longitudinally movable relative thereto, and operable to move the seat segments between the positions, an actuator operable to move the cam, and an electronics package disposed in the housing and in communication with the actuator for operating the actuator in response to receiving a command signal.

Abstract: A setting tool for hanging a tubular string includes: a mandrel having an upper portion and a lower portion for extending into the tubular string; a housing connected to the mandrel upper portion; and a bonnet. The bonnet is: for receiving an upper end of the tubular string, disposed along the mandrel, and linked to the housing. The setting tool further includes: an actuator for stroking the bonnet relative to the mandrel and the housing, thereby setting a hanger of the tubular string; an electronics package in communication with the actuator for operating the actuator in response to receiving a command signal; and a latch. The latch is: connected to the mandrel lower portion, operable between an extended position and a retracted position, for being restrained in the retracted position by being disposed in the tubular string, and extendable by being removed from the tubular string.

Abstract: A lightweight composite having an activated surface contains a lightweight hollow core particle having cement grains which may be adhered to the hollow core or embedded in the surface of the hollow core. The hollow core particle may be prepared from calcium carbonate and a mixture of clay, such as bentonite, and a glassy inorganic material, such as glass spheres, glass beads, glass bubbles, borosilicate glass and fiberglass.

Abstract: A method of treating a formation includes, setting a treating plug within a structure, withdrawing a mandrel from the treating plug after having set the treating plug, maintaining the setting of the treating plug within the structure without a member extending longitudinally through the treating plug, pumping fluid against a plug seated at the treating plug, treating a formation upstream of the treating plug, and disintegrating at least a portion of the treating plug.

Abstract: Crosslinked gelling agents employed during subterranean operations use electronically-modified boronic acids to enable higher operating temperatures while allowing reduced gelling agent loadings; the boronic acids having Formula I: X1 and X2 are independently selected from O, CH2, CH2O, OCH2, bond, and null, Y1 and Y2 are independently N or C, Ar is a 5- or 6-membered ring aryl or heteroaryl group with a link L to monomer unit M1, m is 1 or 2, n is 0, 1, 2, or 3, and each Z is independently an electron withdrawing group selected from nitro, ester, carboxylic acids, carboxylates, halogen, cyano, amide, acyl, alkylsulfonyl, arylsulfonyl, heteroarylsulfonyl, CF3, a quaternary ammonium salt, polyhaloalkyl, and carbamate, with the proviso that when n is 0, the link L between M1 and Ar includes an electron withdrawing group attached to Ar, and introducing the treatment fluids into subterranean formations.

Abstract: An assembly for use to cement an uncased wellbore and create a sidetrack of a wellbore with a single trip into the wellbore. The assembly includes a mill selectively connected to a whipstock. A snorkel tube is positioned within a bore of the mill and within a bore of the whipstock. The assembly is connected to drill string and positioned within an openhole portion of the wellbore. After the assembly has been anchored, cement may be pumped down the drill string and through the snorkel tube. The mill may be removed from the whipstock by shearing a shearable device connecting the mill to the whipstock. The mill is used engage a diverting surface on the whipstock and create a sidetrack. The mill may also mill a portion of the snorkel tube or the snorkel tube may be removed from wellbore up the drill string prior to milling the sidetrack.

Abstract: A tubular string is advanced with a bottom hole assembly as the hole is drilled and reamed in a desired direction with the aid of directional drilling equipment adjacent the bit. When the advanced tubular forms the desired lap to the existing tubular, the assembly can be configured to cement the tubular and expansion can then be accomplished to fill the annular space and enhance the cement bonding. The expansion equipment can create a bottom bell on the expanded tubular and expand the top end into a bell of the existing tubular so that a monobore is created as the process is repeated with each added string. Numerous variations are contemplated for each single trip including but not limited to the direction of expansion, whether cementing or expansion occurs first, reforming folded tubing in the hole as well as the nature of the expansion tool and pressure control when drilling.

Abstract: A casing shoe secured to a lower end of a casing string is positioned a selected distance from a bottom of the well, defining an open hole portion in the well below the casing shoe. Cement is pumped through the casing shoe and back up an annulus surrounding the casing string, while leaving at least part of the open hole portion free of cement. The annulus and the open hole portion are isolated from an interior of the casing string while the cement is uncured. The casing shoe has a timer that opens the interior of the casing string to the open hole portion after a selected time sufficient for the cement to cure. The operator may then pump a tool down the casing string while displacing fluid in the casing string below the tool through the casing shoe and into the open hole portion of the well.

Abstract: A chopper mechanism for providing a fiber to a fluid at an oilfield. The chopper mechanism may be employed to process the fiber from an uncut form to a cut form in order to provide a mixture of the fluid and the fiber with flowback inhibiting character. Techniques of employing the chopper mechanism may be utilized at the site of an oilfield for applications such as fracturing, cementing, and drilling. Additionally, the chopper mechanism itself may be made available as a large high capacity chopper assembly, or a smaller handheld chopper gun for slower rate fiber supply operations.

Abstract: A completion system for arrangement in a borehole including a lower completion, an upper completion string, and an intermediate assembly engaged between the lower completion and the upper completion string. The intermediate assembly includes a single barrier valve only. The barrier valve is operatively arranged to be transitionable to an open position when engaged with the upper completion string and transitions to a closed position via the upper completion string when the upper completion string is pulled out of the borehole.

Abstract: Disclosed are spacer fluids and methods of use in subterranean formations. Embodiments may include use of consolidating spacer fluids in displacement of drilling fluids from a well bore annulus.

Abstract: In one aspect, a method for completing a wellbore in a formation is disclosed, that in one non-limiting embodiment includes placing a casing in the wellbore, cementing an annulus between the casing and the wellbore, and forming an annular cavity of a selected length in the cement between the casing and the wellbore. In one aspect, the forming the annular space includes placing a dissolvable material on an outside of the casing before placing the casing in the wellbore, and dissolving the dissolvable material after cementing to form the annular space.

Abstract: The invention relates to oil-and-gas industry and can be used in emergency killing of wells. The method of emergency killing of a well of underwater head position comprises a cementing composition squeezing, wherein depth of the well section to be cemented is defined basing on the well condition and pressure in it, an injector, fixed on the tank with cementing composition and placed inside a bag made of some flexible material, is bottomed and inserted into the wellhead, the bag being filled with cementing composition which is squeezed into the bag through the injector from the tank, and providing for a firm contact of outer surface of the bag with inner surface of the well, the injector being kept at a target depth by means of the weight of the whole structure filled with the cementing composition, pressure in the bag being maintained till the cementing composition hardening.

Abstract: Methods and washing tools are for combined cleaning of an annulus in a well across a longitudinal section of the well, and subsequent plugging of the longitudinal section.

Abstract: Embodiments of the invention generally relate to a valve assembly for use during a cementing operation. In one embodiment, a valve includes a housing having a bore. The valve further includes a piston member movable between a first position permitting fluid passage through the bore and a second position obstructing the bore through the housing. Additionally, the valve includes a biasing member configured to bias the piston member toward the second position. In another aspect, a method of using a valve in a cementing operation is provided.

Abstract: A method of pressure testing a wellbore during a cementing operation includes positioning a tubular within a wellbore, the tubular including a collar assembly at a distal end of the tubular; urging cement through the collar assembly using a plug, the plug including a releasable sealing member; releasing the sealing member from the plug; sealing the collar assembly using the sealing member; and pressurizing the tubular to a predetermined test pressure and holding the predetermined test pressure for a predetermined time period. In another embodiment, a cementing plug for use with a collar assembly includes a plug body having a bore; and a releasable sealing member coupled to the bore, wherein sealing member is configured to engage and seal the collar assembly, after release.

Abstract: A system is disclosed that includes a drilling rig having a substructure, the drilling rig being adapted to be positioned above a plurality of wellbore location such that each of the plurality of wellbore locations is simultaneously positioned below the substructure, equipment movement means for moving pressure control equipment between positions proximate each of the plurality of wellbore locations, the equipment movement means being adapted to move the pressure control equipment between the positions while the drilling rig is performing a rig operation on at least a first one of the plurality of wellbore locations, and equipment positioning means for positioning pressure control equipment on one or more of the plurality of wellbore locations, the equipment positioning means being adapted to position the pressure control equipment on a second one of the plurality of wellbore locations while the rig operation is being performed on the first wellbore location.

Abstract: A method of encasing a wellbore is provided comprising the application of 3D printing technology to apply a series of layers of lining material to the interior surface of a wellbore. The layers may be of different materials to make best use of their different material properties, to provide structural integrity and good sealing properties, for example. Through suitable printhead control, specific structural features such as channels for receiving measurement, power or communications equipment may be incorporated into the lining structure. Associated devices for depositing the layers of lining material are also provided.

Abstract: The present invention is a valve tool utilized for hydraulically fracturing multiple zones in an oil and gas well without perforating the cement casing. An oil/gas well completion method involves the use of a valve that is installed as part of the casing string of the well. A mandrel-less casing provides for cement flow within the casing when the valve element is in a closed position and allows for axial flow of fracturing fluid through the cement casing to fracture the formation near the valve when the sleeve is open. The invention disclosed herein is an improved valve used in this process.

Abstract: The disclosure relates to a method of delaying viscosification of a well treatment fluid within a well or within a subterranean formation penetrated by a well by introducing into the well a hydratable viscosifying agent of particulates having a minimum of 40% retention on a 60 mesh screen and a minimum of 1% retention on a 20 mesh screen.

Abstract: Present embodiments are directed to coupling a cementation assembly with a hung or set liner string in a well and moving the liner string during a cementation operation. Specifically, for example, a process in accordance with present techniques includes running a cementation assembly into a well on drill pipe and engaging, with a distal end of the cementation assembly, a liner top assembly of a liner string that is positioned downhole in the well, wherein the liner string was previously positioned downhole in the well without being cemented into the well. Further, the process includes latching the cementation assembly with the liner string such that movement of the cementation assembly is translated to the liner string, and flowing cement through the drill pipe and into the liner string while moving the cementation assembly and the liner string.

Abstract: Cement compositions and methods of making the same are provided. The composition comprises cement or lime, water and Lassenite, a pozzolanic strength retrogression inhibitor.

Abstract: A single trip method allows for perforation, cleaning the annular space around the perforations in an existing tubular and then delivering a sealing material through a combination tool that is used for cleaning and then sealing. For sealing the tool is positioned by the lowermost perforations with a bypass around spaced seals that straddle the outlet port for the sealant. There is an open bypass through the tool and around the spaced seals as the sealant is delivered so that the sealant goes above and below the spaced seals. The open bypass allows the tool to be repositioned as the sealant is delivered. The tool is removed with the string. A separate through passage is selectively opened for removing excess sealant in conjunction with the bypass passages. The sealant can be squeezed with a seal on the string to effectively close the bypass letting pressure through the through passage squeeze.

Abstract: The present invention relates to oil well drilling comprising a weighting agent consisting of microfine, particulate ilmenite having a FeTiO3 content of at least 85% by weight, a specific surface area (BET) between 1 and 5 m2/g, where 90% by volume of the particles have a size of less than 12.5 ?m and a D50 between 3 ?m and 6 ?m by volume measured by laser diffraction using Malvern laser diffraction particle size analyzer, where the particles have an average circularity of at least 0.85 determined by image analysis. The invention further relates to high density oil well cement slurry comprising water, Portland cement, a to weighting material and optionally silica flour, microsilica, fiber, rubbery particles a fluid loss addition and a retarder, where the weighting material is particulate microfine ilmenite having a FeTiO3 content of at least 85% by weight, a specific surface area (BET) between 1 and 5 m2/g, and where 90% by volume of the particles have a size of less than 12.

Abstract: An apparatus for use in launching cement plugs in a well cementing operation comprises a cylinder, a piston slideably received in the bore of the cylinder and an actuator extending from the piston through the cylinder. The actuator is operable by the piston for launching plugs from the apparatus into the well. A resilient damper cartridge is slideably mounted on the actuator in the cylinder so as to be contactable by the piston. A series of frangible pins is located in the cylinder wall so as to provide temporary limits to the movement of the cartridge in the cylinder as the piston slides along the cylinder.

Abstract: An apparatus for wellbore treatment includes a tubular with one or more solid, erodible blocks on its outer surface. The blocks carry a chemical for wellbore treatment that is released in the wellbore by erosion of the blocks against the wellbore wall. A method for wellbore treatment employs the tubular to release the chemical in the well by erosion of the blocks.

Abstract: A method of delivering a concentrated quantity of sealing elements to a leak site in a vessel includes deploying a flexible body of material and at least one sealing element into fluid flowing within the vessel upstream of the leak site. The body of material transports the sealing elements through the vessel to the leak site where the body of material is drawn to the leak by fluid flow created by a pressure differential at the leak site. The sealing element(s) are constrained by the body of material at the leak site such that the sealing element(s) become(s) entrained within the leak.

Abstract: The present invention relates to an annular barrier (1) for mounting as part of a well tubular structure (3), the annular barrier being adapted to be expanded in an annulus (2) between the well tubular structure and an inside wall (41) of a borehole (4). The annular barrier comprises a tubular part (6) extending in a longitudinal direction, one or more an expandable tube(s) (7) each having a centre axis (72) extending outside the tubular part in the longitudinal direction, and a sealing element (8) in the form of an expandable sleeve provided on an outer surface of the one or more expandable tube(s) for providing sealing against the inside wall of the borehole, the expandable sleeve extending on the outside of the one or more expandable tube (s). Furthermore, the invention relates to a method of expanding an annular barrier in an annulus and to a downhole system.

Abstract: A method is for zone isolation in a subterranean well. The well is provided with a pipe body at least in a portion. The method includes providing a plug over a longitudinal section of the well, the plug covering substantially the entire cross section of the well at least in a portion of the longitudinal section, so that the plug fills the inside, of a pipe body and an annulus between the outside of the pipe body and a surrounding well body.

Abstract: A packer can include an end ring positioned proximate a seal element on a base pipe, and a gripping device which is compressed radially inward by a surface formed in the end ring, the surface encircling the base pipe. A method of constructing a packer can include positioning an end ring on a base pipe proximate a seal element, and radially compressing a gripping device in the end ring, so that the gripping device grips the base pipe, radial compression of the gripping device resulting from longitudinal displacement of the gripping device relative to the end ring.

Abstract: A method of servicing a subterranean formation comprising providing a wellbore penetrating the subterranean formation and having a casing string disposed therein, the casing string comprising a plurality of points of entry, wherein each of the plurality of points of entry provides a route a fluid communication from the casing string to the subterranean formation, introducing a treatment fluid into the subterranean formation via a first flowpath, and diverting the treatment fluid from the first flowpath into the formation to a second flowpath into the formation.

Abstract: Of the many compositions and methods provided herein, an example method includes a method of treating a subterranean formation that comprises combining components comprising water and a density-matched suspension to prepare a treatment fluid, wherein the density-matched suspension comprises a suspending liquid and a solid particle suspended in the suspending liquid, and introducing the treatment fluid into a well bore. An example composition includes a suspension that comprises a suspending liquid comprising a hydrophobic liquid, wherein the hydrophobic liquid hydrolyzes when placed in contact with an aqueous fluid to form hydrophilic products, and a solid particle suspended in the suspending liquid, wherein the suspension is a density-matched suspension.

Abstract: Methods and compositions that comprise sub-micron alumina for accelerating setting of a cement composition. An embodiment includes a method of cementing in a subterranean formation. The method may comprise introducing a cement composition into the subterranean formation, wherein the cement composition comprises hydraulic cement, sub-micron alumina, and water. The method further may comprise allowing the cement composition to set in the subterranean formation. Another embodiment includes a cement composition that may comprise hydraulic cement, sub-micron alumina, and water.

Abstract: A method is for the combined perforation, cleaning, and the subsequent plugging of a longitudinal section of a well. The well is provided with two pipe bodies placed substantially concentrically. The method includes lowering a perforation tool into the innermost pipe body to the longitudinal section, forming perforations in both pipe bodies along the longitudinal section with the perforation tool, cleaning the longitudinal section with a flushing tool which is attached to a lower portion of a string allowing through-flow, pumping a fluidized plugging material down the string and into the innermost pipe body at the longitudinal section, and placing the fluidized plugging material in the innermost pipe body, and thereby also into the entire cross section of the well via the perforations within the longitudinal section. A flushing tool is for cleaning the longitudinal section of the well.

Abstract: A depressurization tool is described for use downhole in depressurizing an isolated zone. A decompression chamber containing a compressible fluid volume is described. The opening of the chamber is sealed with a closure that is configured to open upon application of a pressure differential across the opening. When used downhole within an isolated and nonpermeable wellbore zone, excessive ambient pressure will cause the closure to open and allow the chamber to fill with fluid at increased pressure, depressurizing the wellbore zone. The tool is useful in wellbore completion systems that include sliding sleeves.