Abstract: A flowback produced water stream is received from a hydraulically fractured well formed in a subterranean formation. The flowback produced water stream includes water, dissolved solids comprising divalent cations, and carbon dioxide. The flowback produced water is flowed to a membrane. The membrane separates at least a portion of the dissolved solids from a remaining portion of the flowback produced water to produce a waste stream and a filtered produced water stream. The filtered produced water stream is reacted with an alkali hydroxide to precipitate carbonates from the carbon dioxide molecules and the divalent cations, thereby mineralizing the carbon from the filtered produced water stream into carbonate precipitates. The carbonate precipitates are separated from a remainder of the filtered produced water stream.

Abstract: A method involves obtaining a current production rate, obtaining a current wellhead pressure, computing a current smoothed production rate from the current production rate, computing a current smoothed wellhead pressure from the current wellhead pressure, predicting based on the current smoothed production rate, the current smoothed wellhead pressure, and the current surface choke size, a future smoothed production rate and a future smoothed wellhead pressure, computing a change of the future vs the current smoothed production rate, and computing a change of the future vs the current smoothed wellhead pressure.

Abstract: A well system includes a wellbore extending from a wellhead and penetrating a producible reservoir and a downhole assembly extendable into the wellbore and including a laser component operable to emit a laser beam into the producible reservoir to induce a first plurality of micro-fractures extending radially outward from the wellbore. The downhole assembly includes a stimulation tool that includes an acoustic component including one or more acoustic generators operable to generate and propagate acoustic waves into the producible reservoir and thereby induce a second plurality of micro-fractures extending radially outward from the wellbore, and one or more acoustic receivers operable to detect and receive reflected acoustic waves returned back from the producible reservoir.

Abstract: Methods and systems for hybrid frac completion are disclosed. The methods include installing a hybrid completion system in a well and, in each zone of a first plurality of zones for plug & perf completion: activating an outer shroud of expanding shape memory polymer (SMP) around a liner, and perforating, using a perforation gun, a borehole wall. The methods further include, in each zone of the second plurality of zones for sliding sleeve completion: activating an SMP packer, and activating a sliding sleeve to expose the borehole wall. The methods further include fracturing the borehole wall by pressurizing the well; sealing, between each zone in the first and second plurality of zones, by actuating a plurality of isolation valves disposed in each zone of the first plurality of zones and each zone of the second plurality of zones; and removing the plurality of isolation valves to produce the well.

Abstract: An ultrasonic system for downhole cleaning of a wellbore includes: an ultrasonic generator that generates high-frequency electric power; a measurement device that monitors electrical parameters related to operation of the ultrasonic system; and an ultrasonic emitter including one or more transducers that break drill cuttings in the wellbore. The ultrasonic emitter is disposed on a Bottom Hole Assembly (BHA) and breaks the drill cuttings made by the BHA in drilling operations.

Abstract: A method for improving oil and gas well productivity includes introducing a lubricating agent into a microfracture in a subterranean formation, coating at least a portion of a first surface and a second surface of the microfracture with the lubricating agent to produce a coated microfracture; and, providing a sufficient time for the coated microfracture to close. The introducing, the coating and the providing cause the first surface and the second surface of the coated microfracture to misalign after the closure of the coated microfracture and an opening to form between the first surface and the second surface. An encapsulated lubricating agent includes 30 to 50 wt % of a lubricating agent, and 50 to 70 wt % of an encapsulant encapsulating at least a portion of the lubricating agent.

Abstract: A method for performing a borehole operation is disclosed. The method includes determining a characteristic diffusion time that corresponds to an undrained response period or a non-monotonic pore pressure dissipation phase of a porous medium surrounding a borehole, determining, based on a pre-determined failure criterion, a critical time of the borehole that corresponds to when a failure of the porous medium occurs within the characteristic diffusion time, identifying a failure region of the failure occurring at the critical time of the borehole, and performing, based on at least the identified failure region, the borehole operation.

Abstract: A method of increasing hydrocarbon recovery from a wellbore penetrating a tight hydrocarbon formation is disclosed. The method involves inserting a hydro-jetting tool into the wellbore; jetting a thermally controlled fluid against the wall of the wellbore to create a cavity in the wall, using the hydro-jetting tool; injecting, using the hydro-jetting tool, a further amount of the thermally controlled fluid into the wellbore such that the pressure in the wellbore increases, wherein the increased pressure creates a fracture from the cavity, wherein injecting the further amount of the thermally controlled fluid cools the tight hydrocarbon formation surrounding the cavity by circulating the thermally controlled fluid within the cavity; withdrawing the hydro-jetting tool from the wellbore; and recovering the thermally controlled fluid and the hydrocarbons escaped from the fracture in the formation.

Abstract: A method of constructing a mechanical earth model (MEM) includes integrating a density logging data set to compute vertical stress and applying correlation models or equations to estimate a pore pressure and mechanical properties. The method also includes calibrating the pore pressure with drill stem test data, calibrating the mechanical properties with laboratory tests on core plugs or on rock cuttings, estimating a minimum horizontal stress using correlation models, and calibrating the minimum horizontal stress with minifrac tests. The method further includes estimating a maximum horizontal stress using the correlation models while assuming one or more correlation parameters, calibrating the maximum horizontal stress with a global pattern of tectonic strains and a basin stress regime, evaluating one or more breakout regions using the MEM, a trajectory of a well, and a geometry of a pilot hole, and comparing the one or more breakout regions and a caliper logging data set.

Abstract: A well tool for generating a notch in an open-hole wellbore, includes a tool body having a housing defining at least one slot and an interior volume. The tool body includes a cutting device disposed in the interior volume, configured to form a notch in a formation. The cutting device includes a shaft disposed in the interior volume of the housing having a first portion with a first exterior threads that extend around the first portion in a first direction, and a second portion having second exterior threads that extend around the second portion in a second direction opposite the first direction. The cutting device includes multiple blades configured to extend radially outward toward the formation through the slot or inward away from the formation and having a first blade extending from the first portion of the shaft and a second blade extending from a second portion of the shaft.

Abstract: Methods for stimulating a subterranean formation and maintaining the conductivity therein may comprise: stimulating a subterranean formation comprising a carbonate mineral by performing matrix acidizing, hydraulic fracturing, or acid-fracturing upon the subterranean formation to form a plurality of flow pathways; after forming the plurality of flow pathways, introducing an ammonium phosphate salt in an aqueous carrier fluid into the subterranean formation; and interacting the carbonate mineral with the ammonium phosphate salt to convert at least a portion of the carbonate mineral into a hydroxyapatite mineral. The subterranean formation, after interacting with the ammonium phosphate salt, has an increased conductivity relative to the subterranean formation, after stimulating but before interacting with the ammonium phosphate salt, under a closure stress of about 600 psi or greater.

Abstract: A method for improving oil and gas well productivity includes introducing a lubricating agent into a microfracture in a subterranean formation, coating at least a portion of a first surface and a second surface of the microfracture with the lubricating agent to produce a coated microfracture; and, providing a sufficient time for the coated microfracture to close. The introducing, the coating and the providing cause the first surface and the second surface of the coated microfracture to misalign after the closure of the coated microfracture and an opening to form between the first surface and the second surface. An encapsulated lubricating agent includes 30 to 50 wt % of a lubricating agent, and 50 to 70 wt % of an encapsulant encapsulating at least a portion of the lubricating agent.

Abstract: Devices, methods, and systems for carbon dioxide (CO2) sequestration using a cellulose nanofiber (CNF) aerogel, having a monolithic structure. The monolithic structure includes an aerogel matrix, a plurality of crosslinked CNFs, and a plurality of cellulose nanocrystal acetone (a-CNC) suspension particles, where the plurality of crosslinked CNFs and the plurality of a-CNC suspension particles are dispersed throughout the aerogel matrix. Systems and methods for CO2 sequestration include locating a CO2 producing process, separating, using a first membrane system, a feed stream into a mixed solid and liquid stream and a first gas stream and separating, using a second membrane system, the first gas stream to produce a second gas stream and a CO2 rich stream. Systems and methods further include directing the CO2 rich stream to a cellulose nanofiber (CNF) aerogel unit and adsorbing CO2 from the CO2 rich stream.

Abstract: A photoelectrochemical system may be utilized for processing of hydrogen sulfide to hydrogen. For example, a method for hydrogen production from hydrogen sulfide may include: providing a photocathode electrically connected by a wire to a photocatalyst, where both the photocathode and the photocatalyst are at least partially immersed in an electrolyte solution that includes an aqueous fluid having hydrogen sulfide at least partially dissolved therein; illuminating the photocathode with first light thereby causing the photocathode to generate a first plurality of electron-electron hole pairs, wherein the photocathode includes a silicon-based heterojunction; illuminating a photocatalyst with second light thereby causing the photocathode to generate a second plurality of electron-electron hole pairs, wherein the photocatalyst includes a semiconductor; and photochemically converting the hydrogen sulfide to hydrogen gas and sulfur.

Abstract: A photoelectrochemical system may be utilized for processing of wastewater to hydrogen. For example, a method for hydrogen production from wastewater may include: providing a photocathode electrically connected by a wire to a photocatalyst, where both the photocathode and the photocatalyst are at least partially immersed in an electrolyte solution that comprises an aqueous fluid having wastewater at least partially dissolved therein; illuminating the photocathode with first light thereby causing the photocathode to generate a first plurality of electron-electron hole pairs, wherein the photocathode comprises a silicon-based heterojunction; illuminating a photocatalyst with second light thereby causing the photocathode to generate a second plurality of electron-electron hole pairs, wherein the photocatalyst comprises a semiconductor; and photochemically converting the wastewater to hydrogen gas and oxygen.

Abstract: A method for improving oil and gas well productivity includes introducing a lubricating agent into a microfracture in a subterranean formation, coating at least a portion of a first surface and a second surface of the microfracture with the lubricating agent to produce a coated microfracture; and, providing a sufficient time for the coated microfracture to close. The introducing, the coating and the providing cause the first surface and the second surface of the coated microfracture to misalign after the closure of the coated microfracture and an opening to form between the first surface and the second surface. An encapsulated lubricating agent includes 30 to 50 wt % of a lubricating agent, and 50 to 70 wt % of an encapsulant encapsulating at least a portion of the lubricating agent.

Abstract: A composition for consolidating a carbonate rock formation includes ground calcium carbonate (GCC) and a solvent. A method of consolidating a carbonate rock formation includes providing a consolidant composition comprising ground calcium carbonate (GCC) and a solvent, applying the consolidant composition to a rock formation, and allowing the GCC to precipitate onto the rock formation.

Abstract: In some examples, a system can include a computer-readable medium storing computer-executable instructions and one or more processors communicatively coupled to a computer-readable medium storing computer-executable instructions, which, when executed by the one or more processors cause the one or processors to receive data of a fracking stage, determine a penetration gradient of the fracking stage based on the data, and classify the fracking stage based on the penetration gradient.

Abstract: A well tool for generating a notch in an open-hole wellbore, includes a tool body having a housing defining at least one slot and an interior volume. The tool body includes a cutting device disposed in the interior volume, configured to form a notch in a formation. The cutting device includes a shaft disposed in the interior volume of the housing having a first portion with a first exterior threads that extend around the first portion in a first direction, and a second portion having second exterior threads that extend around the second portion in a second direction opposite the first direction. The cutting device includes multiple blades configured to extend radially outward toward the formation through the slot or inward away from the formation and having a first blade extending from the first portion of the shaft and a second blade extending from a second portion of the shaft.

Abstract: A method for stabilizing a wellbore includes introducing a hardening agent into the wellbore, mixing the hardening agent with a carrier fluid in the wellbore to produce a wellbore stabilizing fluid, and treating a wellbore wall of the wellbore by contacting the wellbore stabilizing fluid to a surface of the wellbore wall for at least 48 hours. A wellbore stabilizing fluid includes a hardening agent and a carrier fluid. The hardening agent is selected from one of 10 to 100 g/L of the calcium hydroxide nanocrystals, 5 to 99.9% by volume of tetraethyl orthosilicate (TEOS), and 10 to 50 g/L of zinc sulfate. A stabilized wellbore includes a wellbore having a wellbore wall treated with a wellbore stabilizing fluid comprising a hardening agent. The Young's modulus of the treated wellbore wall is at least 5% higher than a Young's modulus of a non-treated wellbore wall.