137 results about "Welan gum" patented technology

The invention relates to Sphingomonas sp. TP-5 and a method and an application of the same for producing welan gum. A strain of the invention is prepared by separating and acclimating sugar-contained wastewater in a molasses plant, has a systematic name of Sphingomonas sp. and a preservation number of CGMCCNo.3097, not only can grow in nutrient media of beef broth, LB and nutrient agar, but also can grow in a sugar-contained inorganic-salt culture medium. The TP-5 strain can be fermented in the sterile culture medium containing sugar, inorganic salt and water at a temperature condition of 28-37 DEG C; ymotic fluid is extracted to obtain the welan gum achieving a temperature-resistant limit value of 150 DEG C; and potassium chloride in different concentrations is added so that a welan gum solution remarkably improves the viscosity, enhances the temperature stability, does not vary the viscosity with temperature and presents stronger temperature tolerance, thereby being applied to seawater drilling mud and a high salinity reservoir viscous water flooding system.

The invention discloses a premixed mortar additive, and a preparation technology and an applying method thereof. The premixed additive comprises a mixture A and a mixture B, and the mixture A comprises a thickener, an air entraining agent, a foam stabilizer, a water reducer and water; the mixture B comprises, by weight, a retarder and water; the thickener comprises at least one of welan gum, a polyacrylate copolymer emulsion, starch and carboxymethyl cellulose; the air entraining agent comprises one of AE-2, fatty acid sodium sulfate and calcium lignosulfonate; the foam stabilizer includes one of cocoamido propyl hydroxy sulfobetaine (CHSB) and a composite foam stabilizer formed by polyvinyl alcohol and calcium stearate; the water reducer is selected from a polycarboxylic high performance water reducer; and the retarder comprises at least two of sodium gluconate, white sugar and sodium hexametaphosphate. The premixed mortar additive has the advantages of improvement of the workability and the water retention rate of a mortar, increase of the tensile bond strength, increase of the air content, and easiness in realization of the control of the opening time.

The invention relates to a modified cellulose / graphene oxide composite microsphere and a preparation method thereof. The composite microsphere is formed by compounding cellulose and a graphene oxide material and is further modified by welan gum. By the compounding of cellulose and graphene oxide, the mechanical strength of a composite adsorption material is enhanced, and the adsorption capacity of an adsorbent is further improved, so that the performance of the adsorbent is well improved; the surface of the cellulose / graphene oxide composite microsphere is modified by welan gum; a branch chain structure and a functional group are introduced, so that multi-layer adsorption can be realized, and the adsorption performance of the adsorbent is further enhanced. The modified cellulose / graphene oxide composite microsphere has the characteristics of no toxicity, no pollution, high bio-compatibility and the like and can be applied to the field of sewage treatment, environment treatment and the like.

The invention discloses ecological and environmental protection type pervious concrete prepared from waste concrete. The pervious concrete is prepared from raw materials in percentage by weight as follows: 65.5%-79.5% of recycled aggregate composition, 1.2%-2.4% of recycled concrete micro-powder, 14-19.5% of cement, 2.4%-4.8% of granulated ferrochrome slag powder, 0.1%-0.3% of a water reducing agent, 0.1%-0.3% of a modifier, 0.1%-0.2% of Welan gum and the balance of water. According to the ecological and environmental protection type pervious concrete, a large quantity of construction garbage and waste residues are consumed, exploitation of natural resources is reduced, the cost is reduced, the added economic value of the construction garbage and the waste residues is increased, development of the construction garbage resource treatment and utilization industry is promoted, and the concrete has the significant economic benefit and social benefit; the modifier and the Welan gum are used, the reactivity of aggregate and an additive in the pervious concrete is improved, and the strength of the concrete is significantly improved on the premise that the permeability performance is guaranteed.

The invention provides a cement paste stabilizer. The cement paste stabilizer comprises welan gum, mineral oil, organic soil and a rheology modifier, wherein the content of the welan gum is 10-60 parts, the content of the organic soil is 1-10 parts, and the content of the rheology modifier is 2-12 parts, relatively to 100 parts by weight of the mineral oil. The rheology modifier comprises a non-ionic surface active agent whose hydrophilic-lipophilic balance value is less than 4 and a non-ionic surface active agent whose hydrophilic-lipophilic balance value is more than 14. The cement paste stabilizer provided by the invention is directly added into water to hydrate and tackify quickly, the addition amount is chosen according to the requirement, the welan gum is not pretreated and is convenient and efficient to use, in addition, the cement paste stabilizer provided by the invention can prevent the cement paste from producing free liquids and settling, so as to be favorable for guaranteeing the cementing quality.

The present invention provides a well cementing cement slurry stabilizer, a preparation method and applications thereof, wherein the well cementing cement slurry stabilizer comprises, by weight, 54-89 parts of quartz sand, 2-20 parts of Welan gum, 0-8 parts of xanthan gum, 3-10 parts of polyvinyl alcohol, and 3-8 parts of a grafted macromolecule polymer. According to the present invention, the stability of the cement slurry can be improved through the stabilizer, the stabilizer does not provide adverse effects on other properties of the cement slurry during the use process, and the stabilizer further provides the benefit on the compressive strength of the cement stone.

The invention discloses composite printing paste and a preparation method thereof. The composite printing paste comprises components in percentage by weight as follows: (a), 80%-97% of carboxyl C1-3 alkyl polysaccharide salt; (b), 0-10% of sodium alginate; (c), 0.5%-5% of biological enzyme; (d), 0.2%-2% of welan gum; and (e), 1%-5% of fatty amine polyoxyethylene ether, and the total weight of the composite printing paste is taken as benchmark. The composite printing paste is good in net permeability, good in stability, high in color yield and easy to remove, the hand feeling is soft, and the comprehensive performance of the composite printing paste is superior to sodium alginate.

The invention relates to a free liquid controlling agent for oil well cement slurry, a preparation method, and applications thereof, and relates to the field of well cementation of oil / gas well. The free liquid controlling agent comprises blended suspension, which is composed of the following components in parts by weight: 100 parts of water, 10 to 30 parts of nano attapulgite, 20 to 40 parts of nano silica, 0.1 to 1 part of dispersant, which is at least one of polycarboxylic acid dispersant, silane polymerized dispersant, and polysulfonic acid dispersant, and 0.5 to 1 part of slurry stabilizing agent, which is at least one of hydroxyethyl cellulose, sodium carboxymethyl cellulose, xanthan gum, scleroglucan, and welan gum. The provided free liquid controlling agent can effectively eliminate or reduce free liquid in oil well cement slurry, and can be used to prepare free-liquid-free cement slurry.

Aqueous compositions comprising: (a) a surfactant; and (b) a thickening system comprising: (i) a gellan gum; and (ii) a thickener selected from the group consisting of polyacrylate thickeners, xanthan gums, guar flours, alginates, carrageenans, carboxy -methylcelluloses, bentonites, wellan gums, carob flours and mixtures thereof; wherein the surfactant comprises a fatty acid soap, and wherein the fatty acid soap is present in an amount of 2 to 20 % by weight based on the composition are disclosed, along with uses therefor.

The invention relates to a well cementing slurry free liquid control agent of the oil-gas well cementing field, a preparation method and application thereof. The well cementing slurry free liquid control agent comprises the following blend components in terms of a total weight of 100 parts: 30-50 parts of an organic viscosifier, 10-30 parts of an inorganic gelling agent, 29-50 parts of an inorganic thickening agent, and 0.1-0.3 part of a crosslinking agent. The organic viscosifier is selected from at least one of carboxymethylcellulose sodium, xanthan gum, scleroglucan, and Welan gum. The inorganic gelling agent is selected from at least one of basic aluminium chloride and sodium metasilicate. The inorganic thickening agent is selected from at least one of fly ash and micro-silicon. And the crosslinking agent is boric acid. The well cementing slurry free liquid control agent provided by the invention can effectively eliminate or reduce well cementing slurry free liquid, is convenient for preparation of well cementing zero free liquid cement slurry, and has good popularization and application value.

The invention provides a high-temperature spacer fluid suspension stabilizer for well cementation, a preparation method of the high-temperature spacer fluid suspension stabilizer and application of the high-temperature spacer fluid suspension stabilizer. The high-temperature spacer fluid suspension stabilizer for well cementation comprises the following ingredients in part by weight: 58-85 parts of clay substances, 8-20 parts of welan gum, 0-5 parts of xanthan gum, 5-10 parts of inorganic salt and 2-8 parts of high-molecular polymer. The high-molecular polymer comprises one or more than one of polyvinyl alcohol, hydroxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl starch ether. The suspension stabilizer serves as an additive and is added into spacer fluid; and after being added with the suspension stabilizer, the spacer fluid has high suspension stability, high consistency, high rheological property and high resistance to elevated temperature.

The invention relates to a Welan gum producing marine strain, which belongs to Sphingomonas sp.WG, and has a preservation number of CCTCC No: M2013161. According to the present invention, the strain can be cultured in a liquid culture medium so as to obtain the Welan gum, and the production efficiency is high; the requirements of the strain of the present invention on the carbon source and the nitrogen source are low; the fermentation process comprises: (1) seed liquid culture and (2) fermentation production of Welan gum; the extraction and purification steps comprise: (1) fermentation broth pretreatment, (2) crude product precipitation, (3) impurity removing, and (4) drying so as to obtain the Welan gum product; with application of the marine strain to produce the Welan gum in the fermentation manner, the yield can be up to 33 g / L, and the extraction and purification yield can be up to 95%; and with the strain and the method of the present invention, the low-cost, high-efficiency and high-quality Welan gum production can be achieved.

The invention discloses a carbon dioxide cured prefabricated water-permeable concrete and a preparation method thereof. The water-permeable concrete is composed of following components in parts by weight: 55 to 80 parts of regenerated aggregate, 7 to 30 parts of nickel slag sand, 18 to 40 parts of cementing material, 5 to 25 parts of water, 0.01 to 2 parts of naphthalene water reducer, 0 to 0.02 part of cellulose ether, and 0 to 0.01 part of welan gum. The cementing material is composed of following components in parts by weight: 70 to 90 parts of common silicate cement, 5 to 15 parts of fly ash, 10 to 30 parts of steel slag, 5 to 15 parts of lime or lime slag, and 0.02 to 1 part of nano calcium carbonate. The technology is simple, the structure advantage of water-permeable concrete and the properties of industrial byproducts such as nickel slag, steel slag, fly ash, and the like are fully utilized; carbon dioxide curing is utilized to realize rapid, efficient and environmentally friendly production; high strength, durable and water permeable concrete is obtained, the energy consumption is reduced, the industrial tail gas, metallurgy slag, and building waste are effectively utilized, and good economic benefits, social benefits, and environmental benefits are generated.

The invention belongs to the technical field of petroleum exploitation industry, and particularly relates to an oilfield oil recovery composite and application thereof. The environmentally-friendly oilfield oil recovery composite comprises the following components by mass: 20-50% of scleroglucan, 20-40% of welan gum, 5-20% of xanthan gum, 5-15% of curdlan, 0 to 10% of polyacrylamide, 1 to 10% of succinic acid and 1 to 10% of sodium sulfite. The environmentally-friendly oilfield oil recovery composite has outstanding high temperature and salt tolerance characteristics, is an ideal environment-friendly, temperature-resistant and high-salt-resistant oil recovery auxiliary, meets the development and application requirements of the current oil production industry, and has a good application value and prospect.

This invention belonging to fermentation microbiology and extraction is a preparation method of mild-wheel gel. We use Sphingomonas sp CGMCC1561 as engineering strain, ferment under the conditions of 25-36deg C and PH 6.2-6.7, and extract mild-wheel gel from fermentation product. This invention overcomes many difficulities in previous methods, such as low adhesiveness (lower than 100cp), PH condition change in fermentation, high cost on medium, low durability of highly-densed calcium ion and so on.

The present invention discloses one kind of Bacilus alcaligenes and its application in preparing Weilan gum. The Bacilus alcaligenes strain has the preservation number of CGMCC No. 1737. The process of preparing Weilan gum with the Bacilus alcaligenes strain includes inoculating the strain to bacteria-free culture medium containing carbon source, nitrogen source, inorganic salt and water; ventilating and stirring culturing in proper conditions; and extracting the fermented liquid to obtain Weilan gum. The Bacilus alcaligenes strain can utilize several kinds of carbon source and nitrogen source and has extensive culture conditions, and the process is simple and has high Weilan gum yield, high Weilan gum quality and low production cost.

The invention relates to an ultrahigh-temperature high-strength tough cement paste system which is composed of the following components in parts by weight: 100 parts of high-sulfate-resistance G-gradeoil well cement, 35-45 parts of acid-pickled quartz sand, 10-20 parts of an ultrahigh-temperature strength anti-recession material, 2-5 parts of an ultrahigh-temperature toughening material, 0.5-2 part of a dispersing agent, 2-4 parts of an ultrahigh-temperature stabilizer, 0.5-4 part of a fluid loss agent, 0.2-2 part of a retarder, 0.1-1 part of a defoaming agent and 40-80 parts of clear water.The acid-pickled quartz sand is refined quartz sand subjected to acid treatment, the ultra-high-temperature strength anti-recession material is a mixture of two or more of wollastonite, kyanite, calcined flint clay and aluminite, the ultra-high-temperature toughening material is a halloysite nanotube, the dispersing agent is a polycarboxylic acid dispersing agent for oil well cement, and the ultra-high-temperature stabilizer is a mixture of bentonite, magnesium aluminum silicate and welan gum. The strength of set cement does not decline under the ultra-high temperature condition, the toughnessis good, and the well cementation quality of unconventional oil and gas wells and high-temperature deep wells is effectively improved.

The invention provides the application of welan gum for increasing the recovery ratio in ultrahigh temperature oil reservoir oil displacement. The application comprises the steps that as for the long-time water-driving ultrahigh temperature high-water-content oil reservoir, a 0.1-0.4% welan gum aqueous solution is injected continuously at the speed of 1 mL / min, and the volume of the welan gum aqueous solution is 0.2-2 times that of pores of the oil reservoir. An oil displacing agent, namely the welan gum, is added into oil displacing fluid, a high-permeability area can be selectively sealed, and the permeability of the section of the oil reservoir is adjusted and controlled, so that the oil displacing fluid enters a low-permeability area easily, and high production and stable production of crude oil are achieved. Meanwhile, the welan gum can bear the temperature as high as 140 DEG C, and accordingly the temperature resistance advantage and excellent rheological property of the welan gum make the welan gum the oil displacing agent suitable for the ultrahigh temperature oil reservoir. It is proved through experiments that the effect that the oil displacement efficiency is improved by 6-12% can be achieved, and the technical bottleneck that the ultrahigh temperature oil reservoir is in short of an effective oil displacing agent is solved.

The invention belongs to the field of biological preparations and discloses a composite polysaccharide fertilizer synergist and a preparation method thereof. The synergist is prepared from, by weight, 0.1-1 part of xanthan gum, 0.1-1 part of Welan gum and 0.001-1 part of polyglutamic acid. The invention further discloses a preparation method and application of the fertilizer synergist. The synergist is natural and free of pollution, has the effect of regulating growth of crops, stimulates vitality of the crops, increases the absorption rate of the crops, improves nutrient absorption efficiency of the crops, increases the utilization rate of fertilizer, and improves the quality of the crops. Thus, the synergist is mixed with the fertilizer to be used, so the yield of food crops, leafy vegetables, melons, fruits and other crops can be effectively increased, and the quality can also be greatly improved.

The invention discloses a sphingol pseudoalteromonas genetically engineered bacterium and relates to sphingol pseudoalteromonas which stress resistance gene is guided into. The stress resistance geneis from extreme microorganisms. The invention further discloses a method for constructing the sphingol pseudoalteromonas genetically engineered bacterium through a three-parent combining method. The invention further discloses application of the sphingol pseudoalteromonas genetically engineered bacterium in fermentation to prepare welan gum or gellan gum. The sphingol pseudoalteromonas geneticallyengineered bacterium disclosed by the invention obviously improves temperature tolerance and acid-base tolerance of the sphingol pseudoalteromonas, a temperature tolerance range is 30 to 42 DEG C, and a pH tolerance range is 4.0 to 10.0. When the sphingol pseudoalteromonas genetically engineered bacterium is used in fermentation to prepare the welan gum, a microbial polysaccharide yield can reach20 to 30g / L under the condition that a pH is not regulated by an external source; when the sphingol pseudoalteromonas genetically engineered bacterium is used in fermentation to prepare the gellan gum, a microbial polysaccharide yield can reach 15 to 22g / L under the condition that a pH is not regulated by an external source; a production efficiency of microbial polysaccharides of the gellan gum,the welan gum and the like is enhanced.

The invention discloses a Sphingomonas paucimobilis strain and application thereof and belongs to the technical field of bioengineering. The Sphingomonas paucimobilis strain is named Sphingomonas paucimobilis strain Y5, is collected in CCTCC (China Center for Type Culture Collection), which is located in Wuhan University, Wuhan, China, and has the collection number of CCTCC NO: M 2015523. Welan gum can be prepared from the train by fermenting under appropriate conditions through carbon sources, nitrogen sources, inorganic salts and water . The strain disclosed by the invention has relatively high sugar conversion ratio and welan gum yield and has a certain application value. The welan gum produced through fermenting the strain is high in quality and is resistant to acids and bases, a 1% aqueous solution viscosity of the welan gum reaches 3500mPa.S, and the viscosity is fundamentally unchanged at the temperature of 150 DEG C. During the fermentation of the strain, the sugar conversion ratio is relatively high and reaches 55% to 60%, and the yield is relatively high and reaches 25-32g / L (dry weight).

The invention relates to the technical field of straws, and provides a degradable environment-friendly straw and a preparation method thereof, the degradable environment-friendly straw comprises the following components by weight: 2-8 parts of sodium alginate, 0.5-5 parts of pectin, 0.5-2 parts of welan gum, 8-30 parts of modified starch, 5-10 parts of a plasticizer, 0.5-1.5 parts of tea polyphenol, 0.4-1.2 parts of chitosan oligosaccharide, 0.2-1 part of calcium gluconate, 0.5-2 part of tartaric acid and 50-100 parts of deionized water. The straw is safe and sanitary, free of toxic and side effects, environmentally friendly, edible, easy to degrade, suitable for wide application and popularization and capable of replacing a disposable plastic straw; therefore, the problems that in the prior art, a disposable plastic straw is difficult to degrade, and environmental and marine ecological pollution is prone to being caused are solved.

The invention discloses a preparation method of modified welan gum. According to the invention, under a stirring condition, welan gum is dissolved in water; a water solution prepared by using 11-bromo undecanoic acid and a catalyst is dropped into the welan gum water solution; a reaction is allowed for 1-6h under stirring under a normal pressure and a temperature of 50-80 DEG C; a reaction liquid is collected and is added into anhydrous ethanol, such that a product is precipitated; and the product is washed, dried, and crushed, such that the modified welan gum product is obtained. According to the invention, long chain is introduced into welan gum, such that welan gum viscosity is improved.

The invention discloses a spacer fluid for deepwater well cementation and a preparation method of the spacer fluid, and belongs to the field of well cementation operation. The spacer fluid for deepwater well cementation comprises the following components in parts by weight: 2-8 parts of a suspension stabilizer, 1-4 parts of a diluent, 1-190 parts of a weighting agent and 100 parts of water, wherein the suspension stabilizer is selected from at least one of attapulgite, bentonite, carboxymethyl cellulose, welan gum, modified guar gum, polyacrylamide and sodium silicate. The spacer fluid has thefollowing effects that the intermiscibility between the spacer fluid and drilling fluid and cement paste is good, the rheological property after intermiscibility is good, and the problems of flocculation of the cement paste, shortening of thickening time and the like cannot be caused. The effect of isolating the drilling fluid from the cement paste is good, and the mutual pollution between the cement paste and the drilling fluid can be effectively prevented. The drilling fluid can be effectively diluted, and the displacement efficiency of the spacer fluid on the drilling fluid is improved. The spacer fluid can be applied to deepwater well cementation operation at the temperature of 0-30 DEG C, and construction of the deepwater well cementation operation is facilitated.

The present invention provides a preparing method of microbial polysaccharides Weilan gum, belonging to biotechnology field. The invention use an alcaligenes faecalis as a fermentation strain, using sucrose or glucose commonly used in food industry as carbon source for microbe cultivation, using conventional chemical fertilizer in the agricultural production as nitrogen source and inorganic salt, the medium of microbial growth is prepared by auxiliary yeast powder, aerobic fermentation is processed in the conditions of 30 DEG C, 1.0vvm, 500r / min ventilatiing and stirring, adding specially supplementary food fluid in the fermentation course achieves the following aims: (1) controlling the penetrating pressure of the broth in the hypotonicity condition; (2) controlling the pH of the broth between 4.0 and 7.0; (3) providing abundant nutritious matter such as carbon source and nitrogen source for microbial growth, obtaining Weilan gum broth after 72 hours, obtainin Weilan gum product by drying in 95-115 DEG C and atmospheric pressure. The production process of the Weilan gum product does not use organic solvent, the broth obtains Weilan gum product to correspond with the petroleum exploitation industry standard only processing one step drying.

Rheology modifying admixture comprising a) from 80 to 99% w / w of hydroxyalkyl guar, cellulose ether, or mixture thereof; b) from 1 to 20% w / w of biopolymer selected from diutan gum and welan gum, and hydraulic compositions containing the rheology modifier admixture together with a superplasticizer.

The invention relates to the field of petroleum extraction, and in particular relates to a water-based fracturing fluid composition and a water-based fracturing fluid. The water-based fracturing fluidcomposition contains a thickening agent, a cross-linking agent, a fracturing auxiliary agent and water, and the water-based fracturing fluid composition is characterized in that the thickening agentis citric acid-modified welan gum. The water-based fracturing fluid is prepared from the above fracturing fluid composition through the following steps: mixing the thickening agent, the fracturing auxiliary agent and the water to obtain a base fluid; and mixing the base fluid and the crosslinking agent to form the water-based fracturing fluid. When the water-based fracturing fluid composition provided by the invention is used to prepare the water-based fracturing fluid, the citric acid-modified welan gum and the cross-linking agent can be subjected to a crosslinking reaction to form a freeze gel system with shear viscosity (80 DEG C@170 s<-1>, 90 min) maintained at 80 mPa.s or more, the shear viscosity is better than an industry standard of Q / SH 0351-2010 ''Technical Requirements of Water-Based Crosslinking chemicals'' and the water-based fracturing fluid meets the requirements of fracturing site construction.

The invention discloses composite food gum and application thereof. The composite food gum consists of the following components in percentage by weight: 70-80 percent of curdlan, 10-15 percent of welan gum, 10-15 percent of scleroglucan and 0.2-2 percent of potassium chloride. The application of the composite food gum in jelly is that the addition amount of the composite food gum is 1-5 percent of the total weight of the jelly. According to the composite food gum disclosed by the invention, the jelly can be prepared in a wide pH value range, and the prepared jelly is high in elasticity, high in toughness and stable in texture, can tolerate repeated freezing-thawing treatment and has a health effect.