Abstract: A metal-to-metal seal for sealing an annular space between a well casing and a wellbore. The seal includes a first end, a second end, and a central seal portion. The central seal portion has a concave shape in a de-energized state which curves towards the centerline of the seal and is capable of flexing radially outward towards surface of the annular space when energized. The central seal portion further includes at least one outer ridge extending outward away from the centerline of the seal and sealingly engages with the outer annular surface when energized.

Abstract: An expandable annular seal tool including a cone having an actuation surface, a seal member disposed in the actuation surface, and an annular seal element disposed on the actuation surface. An embodiment of a borehole system including a borehole in a subsurface formation, and a tool disposed in the borehole.

Abstract: A compression plate to be used with a slip hanger is disclosed in at least one embodiment along with embodiments of methods to prepare and use such a compression plate. The compression plate includes at least one bolt hole and includes at least one split in the at least one bolt hole.

Abstract: A latch system including a plurality of rocker latches, a rocker support, supporting the plurality of rocker latches, and a movement restrictor in operative connection with each rocker latch of the plurality of rocker latches, the movement restrictor allowing or restricting movement of each rocker latch of the plurality of rocker latches relative to the rocker support. A downhole tool including a sleeve movable relative to other portions of the tool, the sleeve having a profile at an uphole end thereof, an actuator runnable into contact with the sleeve, the actuator including the latch. A borehole system including a borehole in a subsurface formation, a string in the borehole, and a latch system disposed within or as a part of the string.

Abstract: The aqueous phase of a drilling fluid can be provided with self-adjusting alkalinity by introducing a buffering system, where the buffering system includes a buffering agent, an acid or a base, and an inorganic salt, and where the pH of the aqueous phase is in the range of from about 8 to about 12. In one non-limiting embodiment, the pH does not vary by more than about 0.5 pH units after a variation in temperature of the drilling fluid of at least about 175° C. for at least about 200 hours.

Abstract: The present disclosure is for an inverted diffuser usable in wellheads and other wellsite equipment. The inverted diffuser includes at least one first section having a first vertical inner surface, a first inclined inner surface relative to the first vertical inner surface, and one or more channels supporting one or more releasable fasteners between the at least one first section and a wall of a wellhead or of a wellsite equipment. At least one second section is press-fitted or fastened adjacent to the at least one first section. A method for application of the inverted diffuser in a wellhead and in other wellsite equipment is also disclosed, along with a method of manufacture of the inverted diffuser.

Abstract: A wellhead annulus packoff and an associated method of energizing and de-energizing are disclosed. The wellhead annulus packoff includes at least one seal element, a hanger lockdown ring, a hanger lockdown energizing ring, a seal lockdown ring, a seal lockdown energizing ring, and one or more mechanical conditional operators, where the at least one seal element adapted to be energized with a first energizing force applied through a seal lockdown energizing ring and with the one or more mechanical conditional operators being engaged, where the seal lockdown ring is adapted to be energized with the first energizing force and with the one or more mechanical conditional operators being disengaged, and where the hanger lockdown ring is adapted to be energized with a second energizing force applied through a hanger lockdown energizing ring.

Abstract: A downhole assembly includes a disintegrable article, which contains a polymer matrix comprising a polymer having an oxygen content of about 2 wt % to about 30 wt %; an energetic material configured to generate heat upon activation to facilitate a chemical decomposition of the polymer; and at least one of a reinforcing fiber or a filler. The disintegrable article is disintegrated by disposing the downhole assembly in a downhole environment; performing a downhole operation; exposing the polymer in the polymer matrix to the generated heat to chemically decompose the polymer producing a decomposed product containing a small molecule in a supercritical state; and disintegrating the disintegrable article with the small molecule in the supercritical state.

Abstract: A wellbore system includes a hanger lock energizing ring, a hanger lock ring, and a shoulder ring. The wellbore system further includes a seal energizing ring coupled to the shoulder ring. The wellbore system also includes a seal element being driven into an energized position by the seal energizing ring. The wellbore system further includes a seal lock energizing ring being driven to move via one or more extensions. The wellbore system includes a seal lock ring being supported, at least in part, by the seal energizing ring. Both the hanger lock ring and the seal lock ring are set, substantially simultaneously, responsive to movement of the one or more extensions.

Abstract: A system for downhole optical analysis includes a housing forming at least part of a pressure barrier. The system also includes a window, formed at an end of the housing, the window being at least semi-transparent to permit light to travel through the window. The system further includes at least one light source, arranged within the housing, wherein the at least one light source is configured to emit a beam of light at a wavelength to enable non-contact, optical cleaning of the window, the wavelength being selected to reduce interaction with the window while heating a fluid film formed on the window outside the housing.

Abstract: A method for managing carbon containing gases, including conveying the carbon containing gas to a reactor vessel, conveying propylene oxide to the vessel, reacting the carbon containing gas with the propylene oxide to create propylene carbonate (PC), applying the propylene carbonate to a cuttings stream from a borehole in a subsurface drilling operation and dissolving residual oil from cuttings of the stream into the propylene carbonate. A system for managing carbon containing gas emissions from a borehole drilling operation, including a carbon containing gas emitter, a reactor vessel fluidly connected to the emitter, a propylene oxide supply fluidly connected to the reactor vessel and an applier connected to the reactor vessel, the applier configured to apply propylene carbonate (PC) created in the reactor vessel to a cuttings stream.

Abstract: A mechanical jar including a housing, a piston disposed in the housing and responsive to applied fluid pressure to move in a first direction relative to the housing, a biasing arrangement disposed in the housing and configured to bias the piston in a second direction opposite the first direction, and a restraint configured to prevent movement of the piston in the second direction until a threshold force is applied to the restraint by the piston, whereafter the piston suddenly moves in the second direction.

Abstract: An open hole tieback completion pressure activated backpressure valve including a housing, a flapper articulated to the housing, a lock out sleeve axially movably disposed within the housing and operatively disposed in relation to the flapper, a seat operatively connected to the sleeve, and a profile that locks the sleeve in place after axial movement of the sleeve. A borehole system including an intervention-less closed lower completion system having delayed opening activation valves with a wellbore isolation valve uphole of a float shoe, and a casing tie-back completion including the valve. A method for completing an open hole including landing an object on a seat of an open hole tieback completion pressure activated backpressure valve, locking out the valve, releasing the object, and landing the same object on a well isolation valve of a lower completion.

Abstract: A method for calibrating an output of a torsional vibration transducer can include: providing a torsional vibration transducer proximate to a body of a shaft configured to rotate along an axis of rotation, the torsional vibration transducer configured to measure a torsional vibration of the shaft; actuating the shaft to cause rotation of the shaft; while the shaft rotates, acquiring, using the torsional vibration transducer, a plurality of zero-stress measurements of the shaft across a plurality of gaps between the torsional vibration transducer and the shaft; calculating at least one calibration coefficient using the plurality of zero-stress measurements; and calibrating the output of the torsional vibration transducer according to the at least one calibration coefficient to reduce a sensitivity of the torsional vibration transducer to changes in gap between the torsional vibration transducer and the shaft when the torsional vibration of the shaft is measured.

Abstract: An apparatus for fabricating a piezoelectric transducer includes a base and a piezoelectric powder depositor to traverse the base and deposit a plurality of layers of piezoelectric powder on the base. The apparatus also includes an electrode disposed at an end of a boom of which is moveable to a selected location with respect to the base and a voltage source to apply a voltage to the electrode to establish an electric field between the electrode and base with sufficient strength to sinter and pole each layer of piezoelectric material and a controller having instructions to deposit the plurality of layers of the piezoelectric powder on the base and to control a position of the electrode and actuate the voltage source to the electrode to sinter and pole the layer of piezoelectric material at defined locations after each layer is deposited to form the piezoelectric transducer in a selected shape.

Abstract: Examples described herein provide for modeling acid flow for acid stimulation of a formation. An example method includes receiving data about the acid stimulation. The method further includes modeling, by applying the data about the acid stimulation to a model, a wormhole velocity of an acid injected into the formation during the acid stimulation, wherein the wormhole velocity is a function of a Darcy velocity of the acid. The method further includes determining whether the wormhole velocity satisfies a wormhole velocity threshold. The method further includes, responsive to determining that the wormhole velocity fails to satisfy the wormhole velocity threshold, modifying a stimulation parameter to adjust the wormhole velocity of the acid. The method further includes performing the acid stimulation based at least in part on the modified stimulation parameter.

Abstract: Time-based sag in a fluid can be measured non-invasively using a time-based sag testing apparatus by measuring the change in rotational inertia over time of fluid having no initial density gradient and a center of mass initially coincident with its geometric center.

Abstract: A section mill including a housing, a cutter pivotally connected to the housing, a drive piston operably connected to the cutter to radially expand or retract the cutter depending upon longitudinal position of the drive piston relative to the housing, and a limit configuration in operable contact with the drive piston to limit drive piston stroke responsive to hydraulic pressure on the drive piston. A method for cutting casing including determining condition of a structure radially outward of a casing to be cut, selecting an amount of expansion of a cutter based upon the determining, and cutting the casing. A borehole system including a borehole in a subsurface formation, a string in the borehole, and a section mill as in any prior embodiment disposed in the borehole.

Abstract: A method of manufacturing a fluid control device includes extruding a polymer melt into a chamber defined by an outer surface of a support structure and a disintegrable metallic tubular member disposed at the support structure, the polymer melt comprising a high heat polymer and a foaming agent, the high heat polymer having a heat deflection temperature of about 100° C. to about 300° C. measured at 1.82 MPa in accordance with ASTM D648-18; sealing the chamber; and foaming the high heat polymer to produce a porous filtration medium in a compacted shape.

Abstract: Systems and methods for constructing a motor having a stator, and a plurality of rotor sections secured to a shaft which is positioned to rotate within a bore of the stator. Each rotor section has permanent magnets forming corresponding magnetic poles. Each rotor section has first and second inwardly facing keyways which are identically positioned in each rotor section and are configured to enable each rotor section to be alternately positioned in at least three distinct circumferential orientations with respect to a key of the shaft. A first subset of the rotor sections is secured to the shaft in a first one of the circumferential orientations, a second subset of the rotor sections is secured to the shaft in a second one of the circumferential orientations, and a third subset of the rotor sections is secured to the shaft in a third one of the circumferential orientations.