36 results about "Carboxymethyl guar gum" patented technology

A seed or seedling is coated with underivatized guar, cationic hydroxypropyl guar, polyacrylamide, poly(methacrylic acid), poly(acrylic acid), polyacrylate, polyethylene glycol), polyethyleneoxide, poly(vinyl alcohol), polyglycerol, polytetrahydrofuran, polyamide, hydroxypropyl guar, carboxymethyl guar, carboxymethylhydroxypropyl guar, underivatized starch, cationic starch, corn starch, wheat starch, rice starch, potato starch, tapioca, waxy maize, sorghum, waxy sorghum, sago, dextrin, chitin, chitosan, xanthan gum, carageenan gum, gum karaya, gum arabic, pectin, cellulose, hydroxycellulose, hydroxyalkyl cellulose, hydroxyethyl cellulose, carboxymethylhydroxyethyl cellulose, or hydroxypropyl cellulose, the coated seed or seedling having a shelf-life at room temperature in ambient conditions in an unsealed container to at least two months.

Crosslinking of a crosslinkable viscosifying agent and a crosslinking agent may be delayed in a well treatment fluid by incorporated within the fluid a glutamic-N,N-diacetic acid salt, such as a glutamic-N,N-diacetic acid sodium salt like tetrasodium glutamate diacetate. The crosslinking agent may be a zirconium containing crosslinking agent like zirconium (IV) acetyl acetonate. The viscosifying agent may be guar or a guar derivative such as carboxyalkyl guars and hydroxyalkylated guars like carboxymethyl guar, hydroxypropyl guar, hydroxyethyl guar, hydroxybutyl guar and carboxymethylhydroxypropyl guar.

The invention discloses a preparation method of high-substituted-ratio carboxyl methyl guar printing gum, which belongs to the technical field of modified guar. The preparation method comprises the steps of performing the procedures of atomizing alkalization, atomizing oxidization, etherification, cooling neutralization, drying, crushing screening and packaging on raw guar powders to obtain the high-substituted-ratio carboxyl methyl guar printing gum. According to the preparation method, the uniformity of a grafting group is ensured by virtue of high-efficiency atomizing and spraying; the high substituted ratio of a final product is ensured by virtue of semi-dry etherification, so that the difficulties of poor uniformity and low substituted ratio of the conventional carboxyl methyl vegetable glue are solved; and simultaneously, compared with the conventional wet processing, the preparation method is more environment-friendly and more economical. The product, namely the high-substituted-ratio carboxyl methyl guar printing gum, disclosed by the invention can partly or wholly replace sodium alga acid to be applied to printing of activated dyes and the printing process of other anionic dyes, and is equivalent to the sodium alga acid in the aspect of application effects of water solubility, color fastness, color yield, vividness, handfeeling and the like, thus serving as a good substitute of the sodium alga acid.

The invention discloses a low-concentration carboxymethyl fracturing fluid and a preparation method thereof. At present, a hydraulic fracturing mode is adopted for reconstructing a reservoir bed, but a fracturing fluid system has high gel breaking residue content; when the reservoir bed is reconstructed, the using amount of a gel breaking agent is high, and the average increment reaches about 0.03 percent; after the fracturing fluid is subjected to gel breakage at formation temperature and flow-back fluid reaches ground, a certain cross-linking back condition exists due to reduction in temperature. The fracturing fluid consists of 96.15-98.85 parts of water, 0.25-0.3 part of carboxymethyl guar gum, 0.15-0.25 part of JL-11 cross-linking agent, 0.30-1.0 part of surfactant, 0.20-1.0 part of clay stabilizer, 0.05-0.5 part of bactericide and 0.2-0.8 part of temperature-resistant intensifier. Prepared solution A and L-11 cross-linking agent are mixed according to a volumetric ratio of 100:0.15-100:0.25 to form the fracturing fluid. In the water-based fracturing fluid cross-linked under an alkaline condition, due to low concentration of a thickening agent, low gel breakage residue and high flow guide capacity, the damage caused to the reservoir bed by the fracturing fluid is reduced, and production increasing and reconstruction effects are improved.

The invention relates to a hydraulic fracturing method for coal bed gas. Active water fracturing fluid is used as the front fluid and the displacement fluid, and carboxymethyl guaridine fracturing fluid is used as the sand-carrying fluid; four kinds of quartz sands with different particle size ranges are selected as the proppant 100-70 mesh silt sand and 70-40 mesh fine sand are used as proppant in the pre-fluid, and 40-20 mesh medium sand and 20-14 mesh coarse sand are used as proppant in the sand-carrying liquid; the proppant selection is different The ratio of the amount of sand added to the particle size sand; the concentration of the clay stabilizer KCl in the active water fracturing fluid and the carboxymethyl guar gum fracturing fluid is based on the natural gamma ray log expressed in API units of the logging data of the fracturing target interval Intensity GR averages are determined. The invention greatly improves the effect of coal bed methane recovery increase, effectively prevents swelling and at the same time reduces the configuration cost of fracturing fluid to the greatest extent.

The invention discloses a sulfonated humic acid fracturing fluid and a preparation method thereof. The method comprises: 1) completely dissolving humic acid in sodium hydroxide solution, then adding sodium sulfite, continuously heating and stirring, and then adding dropwise hydrochloric acid solution until brown and black paste precipitates are produced; the brown-black slurry is purified to obtain sulfonated humic acid; 2) dissolving zirconium oxychloride and ammonium chloride in water, then adding ethylene glycol and lactic acid, and then Add potassium hydroxide solution dropwise until the pH value reaches neutral, continue heating and stirring to obtain a colorless and transparent organic zirconium crosslinking agent; 3) configure carboxymethyl guar gum solution; add sulfonated humic acid to carboxymethyl Stir evenly in the guar gum-based solution; then add an organic zirconium cross-linking agent to obtain sulfonated humic acid fracturing fluid. The novel fracturing fluid obtained by the present invention not only improves the water retention, but also improves the viscoelasticity, and the addition of the sulfonic acid group makes the salt resistance very considerable.

The invention discloses a carboxymethyl guar gum cross-linking agent and a preparation method and application thereof. The technical scheme is characterized in that the carboxymethyl guar gum cross-linking agent comprises the following raw materials in percentage by weight: 8-12% of crystalline aluminum chloride, 20%-22% of additives and the balance of water, wherein the additives are at least two of formaldehyde, glyoxal, ethanediol, propanetriol and glacial acetic acid. The invention also discloses the preparation method of the carboxymethyl guar gum cross-linking agent and the application of the carboxymethyl guar gum cross-linking agent in a carboxymethyl guar gum fracturing fluid system. The carboxymethyl guar gum cross-linking agent prepared through the method disclosed by the invention has the advantages of wide applicability, good cross-linking property and low integrated cost; after added with the carboxymethyl guar gum cross-linking agent, the carboxymethyl guar gum fracturing fluid system becomes weakly acidic and has a pH value of 3-4, and has the functions of effectively inhibiting the expansion migration caused by the electronegativity of a clay surface, thus playing a role in stabilizing clay.