The present disclosure to a cementitious plugging wall solidifier for water-based drilling fluid and a preparation method thereof and a water-based drilling fluid.

A method of repairing a well is provided. The method includes injecting a brine solution into the well, injecting carbon dioxide into the well, and reacting the brine solution in the reservoir rock with the carbon dioxide to form calcite such that calcite precipitates into the desired flow path between a cold well and a hot well to effectively repair short circuits within the EGS reservoir.

A calcium carbonate agricultural product includes calcium carbonate. The calcium carbonate agricultural product may be used to replace any suitable agricultural plastic currently in use. A method of growing plants includes providing a calcium carbonate agricultural product including calcium carbonate to protect the plants. A method for controlling a pH of soil includes: providing a calcium carbonate agricultural product including calcium carbonate to the soil; and releasing the calcium carbonate of the calcium carbonate agricultural product to the soil.

A method of repairing a well is provided. The method includes injecting a brine solution into the well, injecting carbon dioxide into the well, and reacting the brine solution in the reservoir rock with the carbon dioxide to form calcite such that calcite precipitates into the desired flow path between a cold well and a hot well to effectively repair short circuits within the EGS reservoir.

Nano- and micro-particles (NMP) can be formed from an oil/water emulsion. The emulsion is made by mixing a liquid solvent, at least one surfactant, a particle-forming compound, and at least curing agent. If desired, pH control agents and viscosity enhancers can be added to the liquid solvent. The particle-forming compound and the curing agents are mixed together and form the oil phase in the emulsion and after curing, the particles are formed. The nano- and micro-particles can be used as proppant to enhance the conductivity of nano- and microfractures and fluid-loss-control additive for hydraulic fracturing operations.

A lean MEG stream having a first pH level is contacted with a CO.sub.2-rich gas stream to yield a lean MEG product having a second different and lower pH level preferably in a range of 6.5 to 7.0. The system and method can be readily incorporated into a slipstream MEG recovery package, with a source of the lean MEG stream being a MEG regeneration section of the package. The CO.sub.2-rich gas could be a vented CO.sub.2 stream from the MEG reclamation section of the package. Unlike hydrochloric and acetic acid overdosing, CO.sub.2 overdosing of the lean MEG stream does not lead to rapid acidification of the lean MEG product to be stored or injected.

A polishing liquid is provided containing manganese oxide abrasive grains, permanganate ions, and a cellulosic surfactant or a cationic surfactant. The polishing liquid has a pH of 5 or more and 11 or less. The cellulosic surfactant is preferably a carboxymethyl cellulose or a derivative thereof. The cationic surfactant preferably has a quaternary ammonium ion site. The content of the cellulosic surfactant or the cationic surfactant is preferably 0.01 mass % or more and 1.0 mass % or less based on the total amount of the polishing liquid.

A method of repairing a well is provided. The method includes injecting a brine solution into the well, injecting carbon dioxide into the well, and reacting the brine solution in the reservoir rock with the carbon dioxide to form calcite such that calcite precipitates into the desired flow path between a cold well and a hot well to effectively repair short circuits within the EGS reservoir.

A method for extracting and separating salt alkali from saline alkali soil and soil improvement is disclosed. A foundation pit, square convex edge and cylindrical partition are arranged on a saline alkali land. Nitric or phosphoric acid solution is added to obtain a saline alkali pool. A trench is set around, and/or, a cylinder is set in the center of saline alkali pool. The evaporating material is prepared from vermiculite, laid on plastic wrapping material, and/or added into the cylinder. The salt alkali is precipitated and enriched through natural evaporation. The evaporating material enriched with salt alkali is taken out to be dissolved, separated and washed to obtain saline alkali solution and vermiculite or evaporating material. The vermiculite material is returned for reuse, and the above process is repeated. Alkali solution and intercalation agent are added into saline alkali solution to react and crystallize to obtain functional materials.

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.