36 results about "Carboxymethyl guar gum" patented technology

A high temperature blocking gel contains a blend of an aqueous fluid and carboxymethyl guar and a crosslinking agent. The gel exhibits excellent hydration capability in brines and positive viscosity generation and controls fluid loss from an oil well during drilling, completion and/or workover operations.

The invention discloses high-temperature hyper-salinity water-base fracturing fluid consisting of thickening liquid, a cross-linking agent and a gel breaker, wherein the thickening liquid comprises the following components in percentage by weight: 0.4-0.7% of a thickening agent, 0.1-0.8% of a cleanup additive, 0.01-0.1% of a sterilizing agent, 0.1-0.3% of a temperature stabilizing agent, and the balance of hyper-salinity seawater or stratum produced water; the thickening agent is sulfonyl hydroxypropyl guar gum, sulfonyl betaine amphoteric guar gum or sulfonyl carboxymethyl guar gum; the cross-linking agent is a stable complex formed from reaction of 9-18% of a zirconium compound, 3-40% of a boron compound, 9-18% of a chelating ligand and 5-19% of a bridging ligand by mass; the gel breaker is either ammonium persulfate or sodium persulfate. The fracturing fluid is directly prepared from hyper-salinity water and realizes effective utilization of seawater and hyper-salinity produced water from land, and is applicable to seaborne and terrestrial high-temperature oil-gas wells.

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.

The invention relates to a preparation method of carboxymethyl guar gum. The method comprises the steps of: alkalization of guargum raw powder: conducting alkalization at a temperature of 60-70DEG C for 90min, with the guargum raw powder and sodium hydroxide in a mass ratio of 1:0.3, and the guargum raw powder and a bactericide in a mass ratio of 1:0.02; etherification of guargum raw powder: adding chloroacetic acid at a temperature of 50DEG C, with the guargum raw powder and chloroacetic acid in a mass ratio of 1:0.5, carrying out etherification at a temperature of 60-70DEG C for 15min, then adding epoxypropane for thermostatic reaction at a temperature of 60-70DEG C for 2h, with the guargum raw powder and epoxypropane in a mass ratio of 1:0.1; and when the reaction is over, performing washing for 3 times with a washing medium at a mass concentration of 80%, then implementing centrifugation and drying at a temperature of 85DEG C, with the washing medium chosen from methanol, ethanol or isopropanol. The carboxymethyl guar gum prepared by the solvent method of the invention has good fracture-making and sand-carrying functions, and has low broken gum residual content in a fracturing fluid system of the densifier as well as less damage to stratums.

The invention discloses a method for preparing a flocculating agent for water treatment, which comprises the following steps of: by weight percent, weighing 40 to 60 percent of guar gum, 20 to 40 percent of chloroacetic acid, and 20 to 35 percent of alkaline catalyst, placing weighed organic acid into a reactor; adding 80 percent of organic solvent till the organic acid dissolves uniformly and adding an excess amount of 30 percent alkaline catalyst; pouring the guar gum into the reactor, and stirring the mixture in the reactor at room temperature for 5 to 30 minutes till the mixture is uniform; after the material is in a semidry state, crushing the material and passing the crushed material through a sieve; placing the material in an reactor, and heating the reactor in a water bath for promoting the reaction, wherein the water bath temperature is kept between 50 and 80 DEG C, and the reaction lasts for 10 to 60 minutes; after reaction, obtaining carboxyl methylated guar gum by grinding and sieving.

Disclosed is a microcapsule containing: (i) a microcapsule core having an active material, and (ii) a microcapsule wall formed of a first polymer and second polymer. The first polymer is a sol-gel polymer. The second polymer is gum arabic, purity gum ultra, gelatin, chitosan, xanthan gum, plant gum, carboxymethyl cellulose, sodium carboxymethyl guar gum, or a combination thereof. The weight ratiobetween the first and second polymer is 1:10 to 10:1. Also disclosed are processes for preparing the microcapsule and uses of the microcapsules in consumer products.

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.

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 relates to carboxymethyl guar gum acid fracturing fluid, which is prepared from the following components of water, carboxymethyl hydroxypropyl guar gum, a CJ-2 heat-resistant reinforcing agent, a surfactant, a COP-SH clay stabilizer, and a JL-12 crosslinking agent, wherein the JL-12 crosslinking agent is prepared by complexing aluminium chloride and C3-C7 straight chain organic ketone; the COP-SH clay stabilizer is (C4-C8) small cationic quaternary ammonium salt; the CJ-2 heat-resistant reinforcing agent is a mixture of sulfuric acid and citric acid or ethylic acid, which has the pH value of 1-3; the surfactant is a non-ionic fluorocarbon surfactant; a thickening agent of a fracturing fluid system can be used under the acid condition, and the content of water insolubles is more than 5 percent lower than that of the conventional hydroxypropyl guar gum; the matched additives are non-cationic additives, and are difficult to adsorb after entering stratum, so that the wettability of stratum rocks cannot be changed and the performance of the additives cannot be reduced; and the gum-breaking residue of the fracturing fluid system is a little and the damage to the stratum islow.

A seed or seedling is coated with a cross-linked biopolymer and, optionally, a second binder selected from underivatized guar, cationic hydroxypropyl guar, polyacrylamide, poly(methacrylic acid), poly(acrylic acid), polyacrylate, poly(ethylene glycol), polyethyleneoxide, polyamide, hydroxypropyl guar, carboxymethyl guar, carboxymethylhydroxypropyl guar, underivatized starch, cationic starch, corn starch, wheat starch, rice starch, potato starch, tapioca, waxy maize, sorghum, waxy sarghum, 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 seed coating composition is characterized by a dust value, as measured using a Heubach dustmeter device, which is lower by at least 30% as compared to an analogous composition that does not contain the crosslinked biopolymer.

The invention relates to a method for preparing a hydrophobic group and hydroxypropyl group-contained guar gum. At present, the viscosifying agents used for compression fracture on an oilfield are mainly the three varieties, namely hydroxypropyl guar gum, carboxymethyl guar gum and carboxymethyl hydroxypropyl guar gum, the three viscosifying agents have single performance, fracturing fluid systems respectively formed by the three viscosifying agents all require stabilizing agents, cleanup additives, corrosion inhibitors and other varieties of adjuvants, the preparation of fracturing fluids is complicated, and the cost of fracturing construction is increased to a certain extent. According to the method provided by the invention, by taking guar gum pieces as a starting raw material and adopting a kneading method, the hydrophobic group and hydroxypropyl group-contained guar gum is synthesized through etherification and chain scission and grafting, and has the function of a surface active agent, the use amount of the surface active agent is reduced during the usage, the cost is reduced, at the same time, the temperature resistance of the guar gum is stronger than that of the single hydroxypropyl guar gum, and the temperature resistance of a deep well is strengthened.

The invention relates to a preparation method of an acidic crosslinking agent applied to carboxymethyl guar gum. An acid technology is usually carried out in a hydraulic fracturing process, which causes secondary damage to a reservoir stratum. The preparation method comprises the following steps of: uniformly mixing 3 parts by weight of citric acid, 57-82 parts by weight of water and 10-20 parts by weight of micromolecular polyhydroxy compound and heating, after the temperature reaches 50 DEG C, slowly adding 5-20 parts by weight of zirconium oxychloride; and keeping the temperature to be 50-55 DEG C, reacting for 3-4 hours, cooling a product to reach room temperature to obtain the acidic crosslinking agent. The cidic crosslinking agent provided by the invention is suitable for an acidic system, and jelly formed by crosslinking is higher in temperature tolerance and is well in sand carrying property, and can be applied to an alkaline-sensitive stratum; a small quantity of citric acid is added in a synthesis process, so that the pH of the whole reaction system is kept constant, the operation step during production is simplified; and the consumption of the organic zirconium crosslinking agent is 0.8 percent, the concentration of a carboxymethyl guar gum water solution is 0.4 percent, and the quantity of residue after crosslinking gelout is 160mg/L.

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.

Productivity from a subterranean formation is enhanced by pumping into a well penetrating the formation after the well has been drilled a hard water aqueous fluid containing a polymeric stabilizer and a crosslinkable viscosifying polymer such as carboxymethyl guar or carboxymethyl cellulose.

The invention relates to a flame-retardant pearl wool foam board which consists of a main body, a flame-retardant layer and an auxiliary layer, wherein the flame-retardant layer consists of polyacrylate, aluminum sulfate octadecahydrate, basic magnesium aluminum carbonate, polycarbonate and a dispersant; and the auxiliary layer consists of waterborne polyurethane, polyacrylamide, carboxymethyl guar gum, carboxymethyl cellulose, an activated carbon fiber, porous latex and a dispersant. The flame-retardant pearl wool foam board provided by the invention has a flame-retardant layer, both the aluminum sulfate octadecahydrate and the basic magnesium aluminum carbonate can emit moisture when being combusted, then an ambient temperature can be reduced, and functions of fire extinguishing and flame retardancy can be achieved. Meanwhile, due to adoption of the auxiliary layer consisting of dilution materials, moisture in the environment can be absorbed by the auxiliary layer at normal time, andthe absorbed moisture can be released in combustion or at a high temperature; and partial humidity of the environment can be increased, partial temperatures of the environment can be reduced, then combustion can be prevented or retarded, the flame-retardant layer is assisted, and the flame retardancy effect of the pearl wool foam board can be improved.

The invention provides methyl carboxymethyl guar gum as well as a preparation method and application thereof, and belongs to the technical field of active printing and dyeing paste. The invention provides methyl carboxymethyl guar gum. The aqueous solution of the methyl carboxymethyl guar gum has high viscosity, good rheological property and high permeability, and the methyl carboxymethyl guar gumis used as a paste material in reactive printing and dyeing, has good water solubility, is easy to elute, has good rheological property when passing through a printing screen, and does not react withreactive dye and a fabric chemically, so that the hand feeling of the fabric is not influenced; and methyl has certain hydrophobicity, so that the dispersion of the dye in the paste is facilitated, and the paste removal rate is high.

The invention discloses a nanoparticle structure magnetic water purifier and a preparation method thereof. The nanoparticle structure magnetic water purifier is high in treatment speed and good in water purification effect. According to the technical scheme, guar gum is modified, carboxyl methyl guar gum epoxy chloropropane polymer is synthesized, ferrous, ferric iron and the polymer are placed into the same reaction system and grafted to the surface of a nanometer ferroferric oxide particle through a coprecipitation method, and the magnetic nano-particle wrapped by the carboxyl methyl guar gum epoxy chloropropane polymer is manufactured, and the water purifier is applicable to the field of industrial wastewater treatment.

The invention discloses a water-soluble temporary plugging agent suitable for secondary fracturing. The agent is prepared from the following raw material components in percentage by mass: 55-65% of polylactic acid, 20-25% of carboxymethyl guar gum, 10-15% of rubber powder, 3-8% of bentonite, and 0.5-3% of a fluorocarbon surfactant. The rubber powder is butyl rubber powder or high styrene styrene butadiene rubber powder. The preparation method of the water-soluble temporary plugging agent comprises the following steps: adding the polylactic acid into a decompression kettle, heating to 85-95 DEG C, preserving constant temperature, adding the carboxymethyl guar gum after the polylactic acid softens, and stirring and mixing evenly; adding the fluorocarbon surfactant into a mixed material, and mixing evenly; then adding the rubber powder and the bentonite, and stirring for reacting for 2 hours; cooling and solidifying after the reaction is completed, and smashing to obtain the water-soluble temporary plugging agent. Compared with a conventional temporary plugging agent of the same type, the water-soluble temporary plugging agent disclosed by the invention is higher in plugging strength, adhesion performance and suspension stability than the conventional temporary plugging agent, and the requirements of site construction can be met.