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7742 results about "Polyacrylamide" patented technology

Polyacrylamide (IUPAC poly(2-propenamide) or poly(1-carbamoylethylene), abbreviated as PAM) is a polymer (-CH₂CHCONH₂-) formed from acrylamide subunits. It can be synthesized as a simple linear-chain structure or cross-linked, typically using N,N'-methylenebisacrylamide. In the cross-linked form, the possibility of the monomer being present is reduced even further. It is highly water-absorbent, forming a soft gel when hydrated, used in such applications as polyacrylamide gel electrophoresis, and can also be called ghost crystals when cross-linked, and in manufacturing soft contact lenses. In the straight-chain form, it is also used as a thickener and suspending agent. More recently, it has been used as a subdermal filler for aesthetic facial surgery (see Aquamid).

Profile control oil-displacement agent for core-shell type inorganic/organic polymer composite microballoon

The invention discloses a profile control oil-displacement agent for a core-shell type inorganic/organic polymer composite microballoon. A preparation method of the core-shell type inorganic/organic polymer composite microballoon comprises the following steps of carrying out surface modification of inorganic cores of inorganic nano-particles such as silica particles and magnetic particles, and carrying out graft polymerisation by a dispersion polymerization method or an inverse emulsion polymerization method to form polymer shells (such as polyacrylamide cross-linked copolymers) on the surfaces of the inorganic cores. The inorganic components and the organic components bind by chemical bonds so that the core-shell type inorganic/organic polymer composite microballoon has very stale structure. The core-shell type inorganic/organic polymer composite microballoon retains the advantages of polymer microballoons and inorganic particles, and has strong heat-resistant and mineralization-resistant capabilities, high plugging strength and good dilatancy. The core-shell type inorganic/organic polymer composite microballoon can move in rock pores and can plug the rock pores. When a plugging pressure difference is improved to a certain degree, elastic deformation of the core-shell type inorganic/organic polymer composite microballoon can be produced and the deformed core-shell type inorganic/organic polymer composite microballoon sequentially moves to a deep rock stratum part so that a liquid flow direction is changed gradually and a crude oil yield is improved. The profile control oil-displacement agent provided by the invention has a large potential.
Owner:BEIJING UNIV OF CHEM TECH

High-temperature resistant phenolic resin weak gel profile control plugging agent

ActiveCN102559159AOvercoming the problem of poor selectivityHigh gel strengthDrilling compositionBreaking strengthCross-link
The invention relates to a high-temperature resistant phenolic resin weak gel profile control plugging agent, which is a profile control plugging agent formed by reacting partially-hydrolyzed polyacrylamide and a cross-linking agent by acylamino of the hydrolytic polyacrylamide. The profile control plugging agent comprises the following components in percentage by weight: 0.25 to 1.2 percent of partially-hydrolyzed polyacrylamide, 0.2 to 1 percent of cross-linking agent, 0.01 to 1 percent of additive and the balance of water. According to the high-temperature resistant phenolic resin weak gel profile control plugging agent, the water plugging rate is more than 80 percent, the oil plugging rate is less than 30 percent, the profile control plugging agent can be resistant to high temperature of over 90 DEG C, mineralization resistance is up to 85,000 mg/L (on the basis of 80,000 mg/L of sodium chloride and 5,000 mg/L of calcium chloride), the strength of gel is high, breaking strength is improved by 68 percent compared with the prior art, the gel-formation time is adjustable, the aims of plugging high-permeability layers in strata and adjusting water absorption profiles of water injection wells deeply can be fulfilled, the deep profile control of oil layers is realized, and the recovery ratio of petroleum is improved greatly.
Owner:PETROCHINA CO LTD

Harsh oil deposit reversed-phase microemulsion profile-control flooding system and preparation method thereof

The invention relates to a harsh oil deposit reversed-phase microemulsion profile-control flooding system and a preparation method thereof. The problems in the prior art that the initial particle size of the product is improper and polymeric microspheres are poor in expansibility under high-temperature high-salt conditions are mainly solved. The harsh oil deposit reversed-phase microemulsion profile-control flooding system disclosed by the invention comprises the following components in parts by weight of microemulsion: 20-70 parts of an oil-soluble solvent, 5-20 parts of an emulsifier and a co-emulsifier, 20-70 parts of a polymer aqueous phase containing acrylamide and other temperature-resistant salt-resistant comonomers. According to the technical scheme, a semi-continuous reaction method is adopted, the aqueous phase containing acrylamide and other temperature-resistant salt-resistant comonomers is added into an oil phase containing the emulsifiers in batches, and a hydrophobic monomer is added, so that the problems are solved, the prepared polyacrylamide reversed-phase microemulsion is directly compounded or is compounded with other oil field chemicals to be applied to such field applications for improving oil recovery as depth profile control, water plugging and displacement in tertiary oil recovery of a harsh oil deposit.
Owner:CHINA PETROLEUM & CHEM CORP +1

Multicomponent composite flocculating setting agent and use in arsenic contamination water treatment

The invention belongs to the technical field of river water body pollution control and in particular relates to a multiple-element compound flocculating settling agent and the application of the multiple-element compounded flocculating settling agent in arsenic pollution water body treatment. The multiple-element compounded flocculating settling agent is prepared by compounding malysite, aluminium salt, hypermanganate, polyacrylamide and aqueous solution. The multiple-element compounded flocculating settling agent can be applied in the arsenic pollution water body treatment to remove arsenic in the arsenic pollutant water body. The concentration of the arsenic in the treated water can meet or is superior to the specified requirement of three types of water on the arsenic concentration in the national earth surface water environment quality standard (less than 0.05 mg/L). The invention also can be used for removing heavy metals such as copper, chromium, cadmium, lead and the like in water by sedimentation. The multiple-element compounded flocculating settling agent can be used together with a multiple-element compounded metal oxide arsenic removal setting agent in static or flowing arsenic pollution water body treatment for removing the arsenic in the water body polluted by arsenic.
Owner:RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI

Hydrophobically-associating polyacrylamide fracturing fluid thickener, preparation method and applications thereof

The present invention relates to a hydrophobically-associating polyacrylamide fracturing fluid thickener, a preparation method and applications thereof. In the prior art, the polyacrylamide polymer fracturing fluid thickener has disadvantages of insufficient temperature resistance, incomplete gel breaking and instability at high temperature and high shearing. A purpose of the present invention is mainly to solve the problems in the prior art. The hydrophobically-associating polyacrylamide fracturing fluid thickener is prepared by carrying out a reaction on a reaction system comprising components of 15-50 parts by weight of acrylamide, 1-50 parts by weight of a cationic monomer or anionic monomer, 1-20 parts by weight of a nonionic monomer, 0.01-0.5 part by weight of a hydrophobic monomer, 0.001-0.005 part by weight of a molecular weight regulator, 0.0001-0.0005 part by weight of a composite initiator, and 30-80 parts by weight of water. With the technical scheme, the problems in the prior art are well solved. According to the present invention, the hydrophobically-associating polyacrylamide fracturing fluid thickener can be separately applied in the oil and gas field fracturing process, or can be compounded with other auxiliary agents so as to be adopted as the fracturing fluid thickener applied in the oil and gas field fracturing process.
Owner:CHINA PETROLEUM & CHEM CORP +1

Method for preparing organic fertilizer by fermenting cow dung compost

The invention discloses a method for preparing an organic fertilizer by fermenting cow dung compost. According to the method, two times of composting fermentation are adopted and a composting promoter is added, so that the fermentation speed and the composting degree can be quickly increased; meanwhile, polyacrylamide, bentonite, cocoanut active charcoal and the like are added to reduce the moisture in cow dung and achieve the effect of deodorizing; sodium bicarbonate and triple superphosphate are added to generate carbon dioxide which can expand the cow dung, so that the permeability is increased; the early-stage fermentation temperature of the cow dung can be increased by the heat released from reaction, so that the activity of natural fermentation bacteria agents in the cow dung is improved; meanwhile, when the heat generated by the cow dung after a period time of composting is overhigh, the polyacrylamide absorbs the moisture in the cow dung to achieve the effect of reducing the temperature and to reduce turning times; after the fermentation is completed, the organic fertilizer prepared by drying and dewatering is high in fertilizer efficiency, durable and efficient, has the effects of retaining water, sterilizing and improving soil, and can promote the rapid growth of crops, thus improving the yield and the quality of the crops.
Owner:六安亿牛生物科技有限公司

Sulphonated heat resistant and salt tolerant copolymer for oil field and preparation method thereof

ActiveCN102464761AHigh temperature and salt resistanceImprove salt resistanceDrilling compositionHeat resistanceFracturing fluid
The invention relates to a sulphonated heat resistant and salt tolerant copolymer for an oil field and a preparation method thereof, which are mainly used for solving the problems that polyacrylamide has poor heat resistance and salt tolerance under the conditions of high temperature and high salinity, more monomers are introduced by copolymers and the content of the copolymers is high in the prior art. The problems are better solved through the technical scheme in which the sulphonated heat resistant and salt tolerant copolymer for the oil field and the preparation method thereof are provided, wherein the sulphonated heat resistant and salt tolerant copolymer for the oil field is obtained through the steps of introducing monomers with sulfonic groups on larger lateral groups to copolymerize with polyacrylamide, and then hydrolyzing. The sulphonated heat resistant and salt tolerant copolymer for the oil field, provided by the invention, can be used as an oil displacement agent for oilextraction in the oil field and can also be used in the oil field application field such as fracturing fluid thickening agent, water plugging/profile modifying agent, drilling fluid additive and the like. The preparation method provided by the invention is simple in process and easy for industrial production.
Owner:CHINA PETROLEUM & CHEM CORP +1

Gel plugging agent for deep profile control of higher temperature oil reservoir and preparation method of gel plugging agent

The invention relates to a gel plugging agent for deep profile control of a higher temperature oil reservoir, and a preparation method of the gel plugging agent. The gel plugging agent comprises 0.3-0.8 percent of nonionic polyacrylamide, 0.6-1.3 percent of a cross-linking agent A, 0.45-1.44 percent of a cross-linking agent B, 0.02-0.04 percent of a temperature stabilizer and 0.01-0.08 percent of a pH value regulator, wherein the cross-linking agent A is methenamine; the cross-ling agent B is hydroquinone or resorcinol; the temperature stabilizer is sodium thiosulfate, sodium bisulfite or sodium sulfite; and the pH regulator is sodium hydroxide, potassium hydroxide, sodium carbonate or sodium bicarbonate. The gel plugging agent disclosed by the invention has strong temperature resisting performance and can be used for the profile control operation of the high temperature oil reservoir with 100-160DEG C; the gel plugging agent has the characteristics of high strength after being gelatinized, stronger plugging capability for the stratum and favorable thermal stability; and in addition, after the gel plugging agent is stood at the temperature of 130 DEG C for 90 days, the strength change is little and gel breaking and hydration are avoided.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
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