A method of drilling may include mixing, at the surface, a base fluid, a polyvalent cation reactive polymer, and a delayed source of polyvalent cation so as to form a treatment fluid; placing the treatment fluid in a subterranean formation to form a solid plug including the polyvalent cation reactive polymer crosslinked with the polyvalent cation; contacting the solid plug with a breaker so as to transform the solid plug into a reclaimed treatment fluid; and removing the reclaimed treatment fluid. A system for drilling may include a treatment fluid, at the surface, including a polyvalent cation reactive polymer, and a delayed source of a polyvalent cation, where the treatment fluid is settable in the formation to form a solid plug including the polyvalent cation reactive polymer and the polyvalent cation; and a breaker, separate from the treatment fluid at the surface, capable of liquefying the solid plug.

A method and system treat contaminated water. In one embodiment, the method comprises treating contaminated water by introducing a methylmorpholine-N-oxide solution to a vessel. The vessel contains the contaminated water and iron oxide. The contaminated water comprises contaminants. In addition, the methylmorpholine-N-oxide solution comprises methylmorpholine-N-oxide and water. The method further comprises contacting the methylmorpholine-N-oxide solution with the contaminated water. In addition, the method comprises treating the contaminated water by allowing the methylmorpholine-N-oxide to react with the contaminants in the presence of the iron oxide.

A demulsified composition comprising a clear oil phase comprising hydrocarbons, a clear brine phase comprising up to 5 wt. % of a diethanolamine-based C.sub.8-C.sub.18 alkanolamide demulsifying agent, and a water-wetted solid phase.

A demulsified composition comprising a clear oil phase comprising hydrocarbons, a clear brine phase comprising up to 5 wt. % of a diethanolamine-based C.sub.8-C.sub.18 alkanolamide demulsifying agent, and a water-wetted solid phase.

Techniques for separating cuttings from liquid include circulating a drilling fluid that comprises a liquid and formation cuttings to a scree of a screen assembly that includes screen sections; vibrating the screen assembly during circulation of the drilling fluid; while vibrating the screen assembly, separating the liquid from the plurality of formation cuttings; while vibrating the screen assembly, separating a first portion of the formation cuttings of a first size from the drilling fluid with a first screen section; rotating the screen assembly; subsequent to rotating the screen assembly and while vibrating the screen assembly, separating a second portion of the formation cuttings of a second size different than the first size from the drilling fluid with a second screen section; directing the separated liquid through the screen assembly to a liquid outlet; and directing at least one of the first or second portions of the formation cuttings to a cuttings outlet formed in the screen.

A system adapted to condition an initial water feed stream, comprising a water treatment subsystem comprising a first oxygen removal unit comprising a membrane filter, wherein the initial water feed stream flows through the membrane filter and the first oxygen removal unit is adapted to treat the initial water feed stream to remove a first portion of the dissolved oxygen to form a first deoxygenated water stream, a hydrogen stream dissolved into the first deoxygenated water stream, a second oxygen removal unit comprising a vessel filled with a palladium-doped resin, wherein the second oxygen removal unit is adapted to treat the first deoxygenated water stream including the hydrogen stream dissolved therein to catalytically remove a second portion of the dissolved oxygen to form a second deoxygenated water stream, and an oxygen scavenger feeder adapted to blend a chemical scavenger and the second deoxygenated water stream.

A system adapted to condition an initial water feed stream into a treated water stream, the initial water feed stream including at least one of: a sulfate; a hardness; a dissolved solid; and, an oxygen. The system including a sulfate and hardness removal membrane unit adapted to treat the initial water feed stream to remove the sulfate and the hardness, a high pressure reverse osmosis unit adapted to treat the initial water feed stream to remove the dissolved solids, a first oxygen removal unit adapted to treat the initial water feed stream to remove the oxygen, and a second oxygen removal unit adapted to treat the initial water feed stream to catalytically remove the oxygen.

An apparatus includes a vessel, a vent valve, a helical heating element, and a control system. The vessel includes an inlet, a solids outlet, and a steam outlet. The helical heating element is configured to generate heat, thereby vaporizing water in an aqueous fluid to produce steam. The helical heating element includes multiple coils, and a spacing between adjacent coils is adjustable. The control system includes multiple sensors and a controller. The controller is configured to transmit a spacing adjustment signal to adjust the spacing between adjacent coils of the helical heating element and transmit a heating adjustment signal to adjust an amount of heat produced by the helical heating element.

The disclosure relates to an electrocrushing drilling fluid with an electrocrushing drilling base fluid including a non-polar oil, —OH, —(OH).sub.2, or —(OH).sub.3 alcohol, water, and an emulsifier in proportional amounts by weight or volume in that order. The electrocrushing drilling fluid may further contain at least one additive. The electrocrushing drilling fluid may have a dielectric constant or dielectric strength of at least a set amount, an electric conductivity or viscosity less than a set amount, or a combination of these properties. The disclosure further relates to an electrocrushing drilling system containing the electrocrushing drilling fluid and an electrocrushing drill bit and a method of electrocrushing drilling.

Disclosed is a method for enhancing the removal of a per- and polyfluoroalkyl substances (PFAS) component from waste water using a cationic polymer (e.g., a cationic polymer flocculant or coagulant). The cationic polymer enables gas that is diffused through the waste water to carry at least a portion of the PFAS component to the surface of water, creating a foam that can then be removed.