51results about How to "Enhanced hydrophobic association" patented technology

Cloned filovirus genomic cDNA and methods of using the cDNA are provided. Further provided are noninfectious lipid encapsulated filovirus-based particles.

Cloned filovirus genomic cDNA and methods of using the cDNA are provided. Further provided are noninfectious lipid encapsulated filovirus-based particles.

The invention discloses acrylamide modified polymer micro-crosslinking gel and a preparation method thereof. The preparation method is characterized in that the method comprises the following steps that: acrylamide modified polymer PAE containing functional macro monomer is prepared into an aqueous solution with the concentration between 0.1 and 4g / L, the concentration of crosslinking agent between 0.01 and 1.0g / L, the concentration of surface active agent between 0.01 and 8mmol / L and the concentration of heat stabilizer sodium sulfite between 0.005 and 1.0g / L; the aqueous solution is added in a mixing container with a stirring device and is stirred evenly at room temperature; the pH value of the solution is adjusted between 4 and 11 to prepare a polymer solution system of the acrylamide modified polymer micro-crosslinking gel used for tertiary oil recovery and displacement, oil displacement modification, profile modification or water plugging; and the polymer solution system undergoes micro crosslinking during flowing inside an oil layer to form the gel. The acrylamide modified polymer micro-crosslinking gel has ideal elasticity, difficult dehydration, stable performance and excellent performances on tackifying, temperature resistance, salt resistance, shearing resistance and ageing resistance.

The invention relates to the field of crude oil recovery, and discloses a polymer having a surface activity function, and a preparation method and application thereof. The polymer contains a structural unit A, a structural unit B and a structural unit C, wherein the structural unit A is a structural unit having a structure shown in Formula (1); the structural unit B is a structural unit having a structure shown in Formula (2); and the structural unit C is a structural unit having a structure shown in Formula (3). According to the invention, a polymerizable monomer having surface activity is introduced onto a macromolecular chain, and the ether chain structure determines that the synthesized copolymer has high hydrolysis resistance and thermal stability; and meanwhile, the surface tension and interfacial tension of the polymer solution are greatly reduced, so that the polymer has favorable surface activity and fine compatibilization, emulsification and oil washing capabilities, thereby improving the crude oil recovery factor. The Formula (1), the Formula (2) and the Formula (3) are shown in the specification.

The invention relates to the field of crude oil recovery, and discloses a polymer with surface active function, its preparation method and application. The polymer contains structural unit A, structural unit B and structural unit C, wherein structural unit A is a structural unit of formula (1), structural unit B is a structural unit of formula (2), and structural unit C is a structural unit of formula (3) The structural unit; the viscosity-average molecular weight of the polymer is 27 million-31.5 million. The present invention introduces a functional monomer with both surface activity and polymerizable acrylamide into the acrylamide copolymer, so as to improve the surface activity, viscosity increase and temperature and salt resistance of the polyacrylamide solution.

The invention discloses an acid liquid thickener and a preparation method thereof, and belongs to the technical field of oil field acidification. The acid liquid thickener has the following chemical structure formula described in the specification, wherein the value of x to y to z is (200000-300000) to (50-500) to (2-13), and n is an integer of 5-25. The viscosity-average molecular weight of the acid liquid thickener is 6000000-12000000. The acid liquid thickener has the characteristics of being capable of reduction of the friction resistance with an acid liquid pump, good high-temperature resistance, good shear resistance and the like.

The present invention provides a water-based drilling fluid filtrate loss reducer based on modified plantain seed husks and a preparation method thereof. The water-based drilling fluid filtrate loss reducer based on the modified plantain seed husks includes plantain seed husk powder, NaOH, 95% ethanol, chloroacetic acid, hydrophobic nano-calcium carbonate and water. The water-based drilling fluid filtrate loss reducer is prepared by crushing, purification, alkalization and carboxymethylation of the plantain seed husks with high filtrate loss reducing effect and plugging performance, and combination with the hydrophobic nano-calcium carbonate, and the water-based drilling fluid filtrate loss reducer based on the modified plantain seed husks is finally formed by hydrophobic interaction to improve system anti-temperature ability and filtrate loss reducing effect. The water-based drilling fluid filtrate loss reducer has obvious effects. After the water-based drilling fluid filtrate loss reducer is aged at 150 DEG C for 24 hours, the filter loss is remained at a relatively low level (4.3 mL). At the same time, the water-based drilling fluid filtrate loss reducer is non-toxic and has no adverse effect on the environment. The acute toxicity EC50 is greater than 50,000, and the water-based drilling fluid filtrate loss reducer can be completely degraded. The water-based drilling fluid filtrate loss reducer is an efficient drilling fluid filtrate loss reducer. The method has the advantages of being simple, easy in operation and easy in popularization.