8results about How to "High blocking rate" patented technology

The application provides a gas channeling prevention plugging composition and application thereof, and the gas channeling prevention plugging composition comprises a first system and a second system; the first system comprises a crosslinking monomer, a crosslinking agent, a gelation control agent and an initiator; and the second system comprises sodium dodecyl sulfate and N, N, N', N'-tetramethyl-1, 3 propanediamine. The gas channeling prevention plugging composition provided by the application comprises two systems, and the two systems have complementary effects; when the gas channeling prevention plugging composition is used in carbon dioxide displacement exploitation, the plugging rate is high and the application range is wide.

The invention relates to a profile control agent for a high-salinity-resistant deep oil reservoir and a preparation method of the profile control agent, and belongs to the technical field of oil exploitation. The profile control agent is composed of a pretreatment slug, a front slug I, an oil displacement slug II and a reinforced slug III according to a specific volume ratio, each slug adopts adaptive raw materials such as solid particles with composite particle sizes and a composite protective agent, and functional synergy is realized by optimizing a formula and a preparation process. The plugging agent can tolerate the degree of mineralization below 300000mg / L and the temperature of 40-120 DEG C, can realize deep accurate plugging and efficient oil displacement of an oil reservoir, and remarkably improves the plugging rate and the scouring-resistant stability. The profile control agent has the advantages of easily available raw materials, simple preparation and strong construction adaptability, and can effectively improve the oil reservoir development effect in the extreme environment and increase the recovery rate of remaining oil.

This invention discloses a recombinant dimeric chimeric antibody against porcine epidemic diarrhea virus (PEDV), belonging to the field of antibody engineering technology. This invention creatively introduces the CH1 and hinge regions derived from IgG and the CH2-CH3 domains of IgA into the antibody structure to form a chimeric structure, improving the antibody's affinity and specificity, making it an ideal competitive reagent in blocking ELISA. The blocking ELISA kit developed based on this antibody has been clinically validated and can effectively distinguish between positive and negative samples, with a blocking rate of up to 79.7%, demonstrating promising application prospects.

This invention discloses a spiral-shell type fire rescue device and method for underwater emergency disaster reduction. Dike breaches are highly dangerous, necessitating the development of simple rescue equipment operable by non-professional personnel. This invention, before a breach forms, uses water pressure to press a water-retaining plate against the upstream slope of the dike, quickly sealing leaks. By splicing multiple devices together, the equipment can be stabilized on the upstream side of the dike, forming a long, narrow rescue platform, and the water-retaining plate can be used to quickly seal the breach, increasing the rescue operation space. This invention effectively solves the problems of difficulty in locating leaks in the early stages of seepage, increasing the sealing area, and addressing the issue that a single device cannot be stabilized on the upstream side of the dike to complete the rescue task when the breach length is large, thus improving rescue efficiency.

This utility model provides a spark-catching device, belonging to the field of spark-catching hopper technology. It includes a receiving component for receiving sparks and a connecting component suspending the receiving component below a waterstop. The receiving component or connecting component is provided with a guiding structure. When the receiving component and connecting component move within the reinforcing cage, the guiding structure guides the receiving component to move along the length of the waterstop. This utility model, by setting side baffles and a receiving hopper, blocks welding slag and other debris generated during welding through vertical and horizontal sections at close range, reducing slag splashing and improving the slag blocking rate. The blocked slag falls into the receiving hopper. After blocking, due to the slender shape of the side baffles and the receiving hopper, they can be removed from inside the reinforcing cage and hung at the next welding location, making them more convenient to use.

The invention discloses a water shutoff and profile control agent for a low-permeability reservoir and a preparation method of the water shutoff and profile control agent. The water shutoff and profile control agent for the low-permeability reservoir comprises the following raw materials in parts by weight: 20-30 parts of carboxymethyl cellulose; 30 to 40 parts of fumaropimaryl acrylamide; 1-2 parts of a surfactant; 0.5 to 1 part of an initiator; and 5-10 parts of a cross-linking agent. The low-permeability reservoir water shutoff and profile control agent is obtained by crosslinking the carboxymethyl cellulose and the fumaropimaryl acrylamide, and the low-permeability reservoir water shutoff and profile control agent has high shutoff rate at different temperatures because the low-permeability reservoir water shutoff and profile control agent has high temperature resistance due to the addition of the fumaropimaryl acrylamide, so that the shutoff rate of the low-permeability reservoir water shutoff and profile control agent is high; the prepared water shutoff and profile control agent for the low-permeability oil reservoir has high gel strength due to the fact that carboxymethyl cellulose and fumaropimaryl acrylamide form spatial network crosslinking, the gel strength of the water shutoff and profile control agent is greatly improved, on the other hand, fumaropimaryl acrylamide can serve as a cross-linking agent, and the gel forming time is further prolonged.

The invention relates to the technical field of antibodies, and particularly provides a truncated fragment of African swine fever virus C129R protein, an antibody or an antigen binding fragment of the antibody and application of the truncated fragment and the antibody. The amino acid sequence of the truncated fragment C129R delta C is coded by SEQ ID NO: 1, and the truncated fragment C129R delta C has improved immunogenicity. The antibody specifically bound with the C129R protein or the antigen binding fragment of the antibody comprises a heavy chain variable region as shown in SEQ ID NO: 2 and a light chain variable region as shown in SEQ ID NO: 4; the blocking rate of the monoclonal antibody 3C10 is higher than 90%. On the basis of the core material, a kit for detecting the indirect ELISA antibody and the blocking ELISA antibody is constructed. The two kits both show high sensitivity, high specificity and good repeatability, and an efficient and reliable tool is provided for serological detection of African swine fever.

The application discloses a high-strength composite fiber plugging system which is composed of flexible fiber, rigid fiber, suspended viscosity increasing agent, fiber dispersing agent and water. The application also discloses a preparation method of the high-strength composite fiber plugging system, and the steps are as follows: (1) adding formula amount of water into a container, then adding formula amount of flexible fiber, formula amount of rigid fiber and formula amount of fiber dispersing agent into the container in sequence, and mixing uniformly to obtain a mixed solution; (2) stirring the mixed solution obtained in the step (1) at a certain stirring speed, slowly adding formula amount of suspended viscosity increasing agent into the container while stirring, and then stirring uniformly. The application has the advantages of uniform dispersion time less than 120 minutes, viscosity less than 350 mPa·s, suspension stability time more than 1 day, plugging pressure gradient more than 10 MPa / m, plugging rate more than 95%, and thermal stability time of the system at 130 DEG C more than 6 months.