346 results about "Drag reducing agent" patented technology

The invention provides a cement paste system with high strength, elasticity and toughness and application of the cement paste system in deep coal bed gas horizontal well cementation, and the cement paste system is prepared from the following raw materials in parts by mass: 40-70 parts of oil well cement, 13-40 parts of fly ash, 15-45 parts of slag, 5.0-20.0 parts of water-based organic silicon resin, 0.1-0.5 part of ultra-high performance polyethylene fiber, 3.0-8.0 parts of calcium oxide and 2.0-5.0 parts of calcium sulfate whisker. 1.0-8.0 parts of nano silicon dioxide, 1.0-6.0 parts of a fluid loss agent, 0.5-2.0 parts of a drag reducer, 0.2-1 part of a defoaming agent and 50-80 parts of water. The cement paste system disclosed by the invention has the characteristics of remarkable low-temperature quick setting and high early strength, also has the advantages of low water loss, controllable thickening, simple preparation operation and the like, and set cement is high in compressive strength, high in breaking strength and very excellent in elastic and tough mechanical properties.

The invention relates to the technical field of oil and gas field exploitation, and discloses a drag reducer for a multifunctional fracturing fluid and a preparation method thereof.The preparation method of the drag reducer for the multifunctional fracturing fluid comprises the steps that acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and modified itaconic acid are added into deionized water, stirring and mixing are conducted, and the drag reducer for the multifunctional fracturing fluid is obtained. Nitrogen is introduced for 30-40 min to remove oxygen, then azobis (isobutylamidine) hydrochloride is added, the mixture is stirred to react for 48-72 h at the temperature of 45-50 DEG C, and a polymer solution is obtained; and directly and uniformly mixing the polymer solution, the compatilizer and the modified nano silicon dioxide, and reacting in a magnetic stirrer at 60-70 DEG C for 1.5-2 hours to obtain the drag reducer for the multifunctional fracturing fluid. The drag reducer has a good drag reduction effect, and the hydrophobicity, the temperature resistance, the salt resistance and the shear resistance are improved.

The invention discloses a shear-resistant high-drag-reduction high-viscosity slickwater drag reducer and a preparation method thereof, and belongs to the field of deep well / extra-deep well volume fracturing. The drag reducer is formed by polymerizing acrylamide, sodium acrylate, a sulfonate ion-containing hydrophobic monomer, a hydrophobic unit micro-block regulating agent, a molecular weight grade regulating agent and a composite initiator, and the drag reducer is prepared through the special sulfonate ion-containing hydrophobic monomer, the hydrophobic unit micro-block regulating agent matched with the hydrophobic monomer and polymer molecular weight control. The dissolving property and the tackifying property of the polymer are obviously improved; the shear degradation resistance of the drag reducer is improved; excellent sand-carrying performance and drag reduction performance are achieved; the slickwater drag reducer overcomes the defects that an existing slickwater drag reducer is weak in anti-shearing capacity, rapid in drag reduction rate reduction, poor in sand carrying performance and the like, meets the special requirement of deep / ultra-deep oil and gas reservoir fracturing for fracturing fluid rheology, provides key material support for development of deep / ultra-deep oil and gas resources, and guarantees the efficient development target of the deep / ultra-deep oil and gas resources.

The invention discloses a carbon dioxide injection and production well cementation cement paste and a preparation method and application thereof, the well cementation cement paste comprises the following components by weight: 95-105 parts of oil well cement, 44-48 parts of water, 4-6 parts of a polymer emulsion, 4-6 parts of a self-repairing material, 1.5-2.5 parts of a drag reducer, 0.5-1.5 parts of a fluid loss agent and 0.2-0.8 part of an antifoaming agent; wherein the polymer emulsion is an emulsion which is formed by taking methyl methacrylate, vinyl trimethoxy silane and propylene carbonate as monomers through polymerization; the self-repairing material is a microcapsule in which thiobacillus ferrooxidans thalli and bacillus amyloliquefaciens thalli are embedded. The well cementation cement paste keeps good strength and relatively low permeability in a carbon dioxide environment, is good in corrosion resistance and has self-repairing capability.

The invention provides a dry powder drag reducer for fracturing fluid and a preparation method of the dry powder drag reducer, and belongs to the technical field of fracturing materials for well drilling, and the preparation method comprises the following steps: dissolving 4-bromobutyryl chloride and N-dodecyl methylamine in acetonitrile, heating and stirring for reaction, adding polyethylene glycol monomethyl ether acrylate and dichloromethane, stirring and purifying in a nitrogen atmosphere to obtain a dry powder drag reducer; a double-tailed hydrophobic monomer is obtained; uniformly mixing the core-shell SiO2 / Fe3O4 composite nanoparticles, an ethanol water solution, KH570 and an ammonia solution, stirring, and purifying to obtain modified SiO2 / Fe3O4; the preparation method comprises the following steps: adding acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate, a double-tailed hydrophobic monomer and modified SiO2 / Fe3O4 into water, uniformly mixing, adjusting the pH value, introducing nitrogen, mixing and stirring, adding an azo initiator, stirring, cooling, purifying, carrying out vacuum drying, and crushing into powder, thereby obtaining the dry powder drag reducer for the fracturing fluid. The drag reducer has certain heat resistance while achieving good drag reduction performance, and can be better applied to fracturing operation in the well drilling process.

The invention relates to a method for preparing a degradable polyacrylamide fracturing fluid through an RAFT (Reversible Addition-Fragmentation Chain Transfer) polymerization method. According to the method, a chain transfer reagent-RAFT reagent is used during synthesis of a macromolecular chain, and after the chain transfer reagent is added, the reaction rate can be effectively reduced, and gelation is avoided; the control on the molecular weight can be ensured; after the primary amine is added, a C-S bond in the RAFT reagent is converted into sulfydryl which is further oxidized into a dynamic disulfide bond in air, the molecular weight of the fracturing fluid is doubled, and the drag reduction performance of the fracturing fluid is effectively improved; after the reducing agent is added, the disulfide bond is broken, the molecular weight is rapidly reduced, and after the oxidizing agent is added, the molecular weight can be rapidly increased. The obtained linear drag reducer can reach the degradation rate of 87% or above, and has important significance on exploration and development of oil and gas resources.

The invention discloses a water-non-dispersible cement paste system for well cementation. The water-non-dispersible cement paste system comprises the following components in parts by weight: 100 parts of oil well cement, 2-3 parts of an expanding agent, 1-5 parts of an anti-dispersing agent, 0.5-2 parts of a drag reducer, 0-0.1 part of a defoaming agent and 40-45 parts of water, the anti-dispersing agent is formed by copolymerizing the following components in percentage by mass: 15 to 60 weight percent of acrylic acid, 0 to 15 weight percent of N, N-dimethyl acrylamide, 30 to 85 weight percent of acrylamide, 0 to 10 weight percent of N-vinyl pyrrolidone and 0 to 1.5 weight percent of ethylene diamine tetraacetic acid disodium salt; the drag reducer is obtained by graft polymerization of a polyacrylic acid monomer and fatty acid vinyl ester in a molar ratio of (8-36): 1; the polyacrylic acid monomer is formed by copolymerizing 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid, sodium p-styrenesulfonate and acrylamide according to a molar ratio of (0.08 to 0.6): 1: (0.05 to 0.3): (0.1 to 1); the water non-dispersible cement paste system for well cementation has good dispersion resistance and flowing property, and the water invasion resistance of the cement paste is effectively improved.

The invention discloses a flexible anti-fouling and anti-drag composite coating with temperature responsiveness and a preparation method and application of the flexible anti-fouling and anti-drag composite coating. The flexible antifouling anti-drag composite coating comprises a substrate layer, a flexible buffer layer, an antifouling response layer and a hydrophobic surface layer which are sequentially formed on the surface of a base material, wherein the substrate layer comprises adhesive resin, a positively charged polymer and a particle filler; the flexible buffer layer comprises flexible polymer resin, a negatively charged polymer, a polymer drag reducer and an anti-ultraviolet additive; the hydrophobic surface layer comprises flexible polymer resin, a temperature-responsive polymer microcapsule encapsulated with an antifouling agent, a pore-foaming agent, an anti-ultraviolet additive and super-hydrophobic micro-nano particles. The flexible anti-fouling and anti-drag composite coating with temperature responsiveness provided by the invention has strong binding force with a base material, and also has anti-fouling property, corrosion protection property and anti-drag property; meanwhile, the preparation method provided by the invention has the advantages of wide application range, large-area coating and the like.

The invention discloses a shear-resistant high-drag-reduction medium-viscosity slickwater drag reducer and a preparation method thereof, and belongs to the field of deep well / extra-deep well volume fracturing. The drag reducer is formed by polymerizing acrylamide, a sulfonate ion-containing hydrophobic monomer, a hydrophobic unit micro-block regulating agent, a molecular weight grade regulating agent and a composite initiator, and the drag reducer is prepared by controlling the special sulfonate ion-containing hydrophobic monomer, the hydrophobic unit micro-block regulating agent matched with the hydrophobic monomer and the molecular weight of a polymer. The dissolving property and the tackifying property of the polymer can be obviously improved; the shear degradation resistance of the drag reducer is improved; excellent sand-carrying performance and drag reduction performance are achieved; the drag reducer overcomes the defects that an existing drag reducer is weak in anti-shearing capacity, fast in drag reduction rate reduction, poor in sand carrying performance and the like, meets the special requirements of deep / ultra-deep oil and gas reservoir fracturing for fracturing fluid rheology and shaft high drag reduction, provides key material support for development of deep / ultra-deep oil and gas resources, and guarantees the efficient development target of the deep / ultra-deep oil and gas resources.

The invention discloses deep coal bed gas well cementation cement paste and a preparation method thereof, and the deep coal bed gas well cementation cement paste is prepared from the following raw materials in parts by weight: 100 parts of G-grade oil well cement, 5-15 parts of water-borne epoxy resin, 1.5-3 parts of a nano silicon dioxide solution, 0.5-1.8 parts of calcium sulfate whiskers, 0.2-0.6 part of composite coating fibers, 1.2-1.8 parts of a fluid loss agent and 0.5-1.8 parts of a retarder. 0.3 to 0.5 part of a drag reducer, 0.2 to 0.5 part of a defoaming agent and 38 to 42 parts of water; wherein the composite coating fiber is hydrophilic epoxy resin modified polyethylene fiber. The cement paste can improve the well cementation cementing packing quality of a coal seam, and has good filtration property.

The invention belongs to the technical field of dry powder drag reducer preparation equipment, and particularly relates to dry powder drag reducer online preparation skid-mounted equipment which comprises a storage bin, and a feeding device is arranged on the storage bin; the feeding device comprises a feeding bin communicated with the storage bin, and a feeding opening is formed in the feeding bin; a bag outlet bin is further arranged on the feeding bin, and a bag outlet structure is arranged on the bag outlet bin. A rotating bin is intermittently and rotationally connected to the feeding bin, and a plurality of partition plates are evenly distributed on the rotating bin in the circumferential direction. A cutting shaft rotationally connected with the rotating bin is arranged between every two adjacent partition plates, and a plurality of inner cutting knives are arranged on each cutting shaft. An outer cutting knife corresponding to the inner cutting knife is fixedly connected to the inner wall of the feeding bin and arranged on the inner wall, away from the bag outlet bin, of the feeding bin. The multiple cutting shafts are each rotationally connected with a pair of push plates opposite in rotating direction. The invention provides the dry powder drag reducer on-line configuration skid-mounted equipment which can automatically carry out bag breaking, charging and packaging bag collection on drag reducer packaging bags.

The invention provides a magnetic suspension dispersing device for blending a polymer drag reducer and a use method. A supporting body II is installed on a base, a supporting body I is installed on the supporting body II, a suspension electromagnet is installed in the base, a rotating shaft is rotatably installed in the supporting body II, a permanent magnet is installed at the bottom of the rotating shaft, and the suspension electromagnet is located below the rotating shaft. The magnetic rotating rotor is installed on the rotating shaft, the magnetic rotating stator is installed in the supporting body II and arranged on the outer side of the magnetic rotating rotor in a surrounding mode, the supporting shaft is connected with the rotating shaft, and the dispersing stator and the electromagnet stator are both installed in the supporting body I. The magnetic dispersing rotor is connected with the supporting shaft. The magnetic dispersion rotor is arranged on the outer side of the dispersion stator in a surrounding mode, the annular permanent magnet is arranged on the outer side of the magnetic dispersion rotor in a sleeving mode, and the electromagnet stator is arranged on the outer side of the annular permanent magnet in a surrounding mode.

A treatment fluid for oilfield applications, such as matrix acidizing and acid fracturing. The treatment fluid is a two-phase fluid with an hydrophobic continuous phase and an at least partially dispersed water phase. The hydrophobic continuous phase can contain 1 ppm to 10 wt %, based on the total weight of the treatment fluid, of one or more types of oil-soluble DRAs having a weight average molecular weight greater than 200,000. The at least partially dispersed water phase can contain water and one or more reactive acids having a pH of 4 or less than 4.

The invention discloses a polymer shear degradation evaluation method based on an FENE-P model, and belongs to the field of polymer turbulence drag reduction. The method comprises the following steps: carrying out a polymer degradation influence factor experiment based on a polymer degradation loop experiment device, and calculating a degradation rate; carrying out a viscous shear rheological experiment aiming at solutions at different degradation stages; fitting rheological experiment data, and establishing a rheological equation; determining viscoelastic parameters in the FENE-P model, correcting a momentum equation and a molecular deformation transport equation, and compiling a related UDF file; loading the UDF file into a source item, a transient item and a convection item of a fluid domain of FLUENT software, and changing relevant viscoelastic parameters of an FENET-P model to realize polymer fluid degradation flow field simulation; and analyzing the flow field information difference between the Newtonian fluid and the FENE-P solution, evaluating the shear degradation behavior of the polymer flowing from a macroscopic flow field to a microcosmic flow field, and explaining the shear degradation mechanism of the polymer. The method provided by the invention provides a theoretical basis for optimization of the polymer drag reducer in actual fluid turbulence transportation.

The invention provides an environment-friendly efficient energizing flushing fluid. The flushing fluid comprises hydrochloric acid, a base fluid A, an energizing capsule B and a catalytic capsule C, the base solution A is prepared from the following components in parts by mass: 100 parts of water serving as a dispersion medium, 0.5 to 1 part of an emulsifier, 0.5 to 1 part of a surfactant, 1 to 2 parts of a cosurfactant, 5 to 10 parts of a mutual solvent, 0.03 to 0.08 part of a drag reducer, 25 to 45 parts of an organic solvent, 0.05 to 0.1 part of a bactericide and 0.3 to 0.5 part of a scale inhibitor; an energy increasing agent CO (NH2) 2 and an energy increasing agent NH4Cl; the energizing capsule B comprises a capsule core and a capsule wall; the capsule wall is paraffin and the like; the capsule core is prepared from NaNO2 and NaHCO3; the catalytic capsule C comprises a capsule core and a capsule wall; the capsule core is oxalic acid and the like; the capsule wall is paraffin and the like. The flushing fluid has the characteristics of small flow resistance, viscosity reduction, obvious energy increase, strong chip carrying capacity, high dynamic paraffin dissolving rate, high paraffin inhibition rate, safety and environmental protection, and can realize multiple effects.

The application relates to a dry powder drag reducer for fracturing fluid and a preparation method thereof, and belongs to the technical field of drag reducers; the dry powder drag reducer is copolymerized and modified by preparing a polymerizable modifier, aromatic rings and sulfonic acid ion structures are introduced into the dry powder drag reducer, the high-temperature resistance and salt resistance of the dry powder drag reducer are effectively improved, in addition, the modified dry powder drag reducer structure also has a catechol structure, can form a stable five-membered ring borate with a boron crosslinking agent, and the dry powder drag reducer can be mixed with a guar gum drag reducer when the boron drag reducer is used, so that the problem of poor sand carrying capacity of the dry powder drag reducer is effectively solved.

The present disclosure provides a drag reducing agent. In an embodiment, the drag reducing agent includes a polymer and a liquid carrier. The polymer is composed of one or more C6-C14 α-olefin monomers. The polymer includes a residual amount of zirconium. The polymer has an absolute weight average molecular weight (Mw(Abs)) greater than 1,300,000 g / mol and a (Mw(Abs) / Mn(Abs) from 1.3 to 3.0.

The invention relates to the technical field of drag reducer preparation, and in particular to a method for producing a salt-resistant drag reducer for oil well fracturing. S1.1, weighing the following raw materials in parts by weight: 27-32 parts by weight of a modified polymer, 0.6-1.1 parts by weight of a cross-linking agent, 0.1-0.3 parts by weight of an antioxidant, 2-6 parts by weight of an acetate buffer, 0.6-0.8 parts by weight of a surfactant, 0.02-0.04 parts by weight of a benzalkonium chloride biocide, and 0.2-0.4 parts by weight of a bentonite suspending agent; wherein, the modified The polymer is prepared by copolymerization of acrylamide, crotonic acid and acrylic acid phosphonate in a mass ratio of 7:2 to 4:10 to 13; S1.2, adding the above raw materials and continuously stirring to obtain a salt-resistant drag reducer; crotonic acid, acrylic acid phosphonate and acrylamide are used to prepare a modified polymer, and carboxyl and phosphonic acid groups are introduced into the polyacrylamide, thereby enhancing the water solubility of the polymer and, at the same time, improving the coordination ability of the modified polymer with the zirconium ions in the cross-linking agent, thereby improving the salt resistance and drag reduction effect of the modified polymer.

The invention discloses a drag reduction composition, a preparation method thereof and a pipeline drag reducer. The drag reduction composition comprises the following components in parts by mass: 10-21 parts of a polymethacrylate compound, 6-18 parts of a dispersing agent and 2-9 parts of a lubricating agent, the lubricant is prepared from one or more of glycerol triacetate, glycerol tripropionate, pentaerythritol tetraacetate and dipentaerythritol hexaacetate. The drag reduction composition provided by the invention comprises the polymethacrylate compound matched with the dispersing agent and the specific lubricant, and the components jointly form a suspension system with stable properties, so that the degree of freedom of motion among polymer molecules can be increased, and the occurrence of an agglomeration phenomenon is reduced. When the drag reduction composition is added into a pipeline containing crude oil or product oil, polymer molecules can be stretched, folding and curling phenomena of the polymer molecules can be reduced, and a good drag reduction effect can be quickly achieved.

The invention relates to a dry powder drag reducer for fracturing fluid and a preparation method thereof, and belongs to the technical field of drag reducers. The dry powder drag reducer is subjected to copolymerization modification by preparing the polymerizable modifier, an aromatic ring and sulfonic acid ion structure is introduced into the dry powder drag reducer, the high temperature resistance and salt resistance of the dry powder drag reducer are effectively improved, in addition, the modified dry powder drag reducer structure further has a catechol structure, and the modified dry powder drag reducer has a good application prospect. The dry powder drag reducer can form stable five-membered ring boric acid ester with a boron cross-linking agent, when the boron drag reducer is used, the dry powder drag reducer can be mixed with a guar gum drag reducer for use, and the problem that the dry powder drag reducer is poor in sand carrying capacity is effectively solved.

The invention belongs to the technical field of oil exploitation, and relates to a drag reducer for fracturing and a preparation method thereof. The preparation method comprises the following steps: adding 1, 5-hexadiene-3, 4-diol and a catalyst into a high-pressure reactor, raising the temperature, introducing ethylene oxide, raising the temperature, carrying out a heat preservation reaction, stopping heating, and cooling to 50 DEG C or below; adjusting the pH value to 2-3 by using phosphoric acid, adding sulfamic acid, heating, preserving heat and reacting, and cooling to below 40 DEG C; the preparation method comprises the following steps: adding deionized water, 2-(trifluoromethyl) acrylic acid and methacryloylethyl sulphobetaine, stirring and dissolving, adjusting the pH value to 7-8, adding an initiator, heating and carrying out a heat preservation reaction to obtain a viscous liquid; and settling, centrifuging, cleaning and drying to obtain the product drag reducer. The drag reducer has the characteristics of high viscosity and high drag reduction rate.

The invention discloses a deep-sea mining plume inhibition technology using an AUV (Autonomous Underwater Vehicle) to add a flocculating agent, which comprises a mine car, a solution mixing container is arranged in the mine car, a stirrer is arranged on the solution mixing container, a second flow pump is arranged on the left side of the solution mixing container, and one end of the second flow pump is connected with the solution mixing container through a conveying pipeline; the other end of the solution mixing container is connected with a water pumping pipeline through a conveying pipeline; a jet flow pump is arranged on the left side of the solution mixing container; a flocculating agent is accurately added through the AUV, aggregation and sedimentation of suspended particulate matter are promoted, formation and diffusion of plume are effectively inhibited, pollution of deep-sea mining to the marine environment is reduced, the AUV can conduct autonomous navigation and control operation underwater, the system can adapt to the complex deep-sea environment, and the service life of the system is prolonged. The application scene of the technology is wide, the flocculant can be used for reducing plume generation, the drag reducer can also be used for reducing water jet resistance, and the mining efficiency is improved.

The invention belongs to the technical field of hydrodynamic drag reduction, and discloses an underwater vehicle bionic drag reduction system based on drag reducer infiltration, which comprises an unpowered pressurizing mechanism and a drag reducer bionic injection mechanism, the unpowered pressurizing mechanism comprises a water inlet opening, a water inlet channel, a movable cover plate, a gas storage cavity and a one-way conduction Tesla valve, the drag reducer bionic injection mechanism comprises a grid supporting body, a grid channel, a double-layer elastic film, an elastic brace and a micro groove. When the underwater navigation body is in an underwater static state, the movable cover plate is tightly closed under the action of gas in the gas storage cavity, at the moment, the gas in the gas storage cavity cannot enter the double-layer elastic film, and the elastic brace is in a closed state; when the underwater navigation body is in an advancing state, the movable cover plate is opened under the influence of water flow pressure, gas in the gas storage cavity enters the double-layer elastic film through the one-way conduction Tesla valve to be pressurized, and the resistance reduction liquid overflows to the outside through the elastic supporting baffle. The device is applied to the field of outflow flow and can adapt to different operation conditions, and flow resistance is effectively reduced.

The invention discloses a method for preparing a baking-free brick by co-grinding mineral powder and high-water-content sand washing mud, which specifically comprises the following steps: (1) conveying the high-water-content sand washing mud into ball milling equipment, and adding the mineral powder and a drag reducer; (2) adding a curing agent and fine aggregate into the wet-ground slurry, and carrying out homogenization treatment by using forced mixing and stirring equipment; and (3) carrying out extrusion forming on the homogenized slurry, and curing to obtain the sand washing mud-based baking-free brick. The baking-free brick is prepared from the mineral powder and the high-water-content sand washing mud through common wet grinding treatment, the raw material source is wide, and the preparation process is simple; meanwhile, the repeated step of dewatering first and then adding water and resource waste are avoided, and the environment is protected while the cost is saved.

The present invention discloses a fully automatic online continuous mixing device for a powder drag reducer, which specifically relates to the technical field of drag reducer mixing, including a water storage tank, a mixing component and a blending component, wherein the mixing component includes a mixing tank, wherein a stirring member is arranged in the mixing tank, and the blending component includes a material storage tank, wherein a conveying member is arranged in the material storage tank, wherein the conveying member is connected to the inner cavity of the mixing tank, and the blending component can adjust the viscosity of the liquid in the mixing tank through the mixing component, wherein the stirring member includes a rotating shaft rotating in the mixing tank, wherein a motor is fixedly connected to the top of the mixing tank, wherein the output end of the motor is fixedly connected to the rotating shaft, and wherein a plurality of stirring rods for stirring the liquid in the mixing tank are evenly arranged in the circumferential direction at the bottom of the rotating shaft. Through compression and relaxation of a third elastic member, the acute angle formed by the axis line of the sealing cover and the second conveying pipe is continuously changed according to the change of the viscosity of the mixed liquid in the mixing tank, and the viscosity of the mixed liquid in the mixing tank is adjusted in real time while continuous mixing is performed.

The invention relates to the field of oil and gas gathering and transportation, in particular to a drag reducer for oil and gas gathering and transportation and a preparation method of the drag reducer, and solves the problems that poly-alpha-olefin drag reducers are insufficient in shear resistance, and nano drag reducers are unstable in drag reduction effect and poor in drag reduction effect. Dispersing graphene oxide in an alkaline solution, dropwise adding the dispersed graphene oxide into deionized water containing carboxymethyl cellulose, adding a catalyst, and carrying out a heating reaction to obtain a miniature elastomer; the preparation method comprises the following steps: preparing a micro elastomer, oxidizing the micro elastomer to form alkali liquor containing an activated nano material, modifying the activated nano material by using a polyphenol compound, and modifying a long-chain hydrophobic structure to obtain the hydrophobic drag reducer. The oil gas drag reducer prepared by compounding the graphene oxide and the cellulose and constructing a plurality of hydrophobic long chains is excellent in drag reduction effect and high in shear resistance.

The utility model discloses a belt conveyor for resistance reducing agent production raw materials, and relates to the technical field of resistance reducing agent production and related equipment. The cleaning device comprises a base and a conveying frame installed over the base, the front ends and the rear ends of the two sides of the bottom of the conveying frame are movably connected with hydraulic cylinders through hinges, a sealing cover is installed on the outer side of the top of the conveying frame, a cleaning assembly is arranged on one side of the upper surface of the base, and a cleaning assembly is arranged in the center of the upper surface of the base. A drying box is installed on the edge of one side of the bottom of the conveying frame, a heating pipe is installed in the drying box, and a dust suction assembly is arranged behind the base. The cleaning effect and efficiency of the conveying belt can be improved through the cleaning assembly, the cleaning assembly and the drying box, the labor amount of workers is reduced, dust in the working environment can be reduced through the dust collection assembly, and the situation that the dust flies in the working environment and is inhaled by the workers, and body health is affected is avoided.

The invention discloses an underwater vehicle head structure capable of slowly releasing a drag reducer, and belongs to the field of underwater drag reduction of vehicles. Comprising a head cone section and a head circular truncated cone section which are coaxially and fixedly connected, one end of the head circular truncated cone section is in sealed connection with the head cone section, a cavity structure for containing a drag reducer solution is arranged at the joint, and the other end of the head circular truncated cone section is in sealed connection with a navigation body middle section; the head cone section is a rotary body porous medium which is close to a cone, the cone vertex of the head cone section is a molded line stagnation point which forms a conical molded surface, the axial height at the stagnation point is the largest, and the axial thickness is in a change rule of gradually decreasing from the stagnation point to the edge of the bottom end. The defects that in the prior art, a drag reducer solution cannot evenly wrap the whole vehicle, and the integrity of a shell of the vehicle is greatly damaged when the drag reducer is released are overcome.

This invention provides a dry powder drag-reducing agent for fracturing fluids and its preparation method, belonging to the technical field of fracturing materials for drilling. The method includes the following steps: dissolving 4-bromobutyryl chloride and N-dodecylmethylamine in acetonitrile, heating and stirring to react; adding polyethylene glycol monomethyl ether acrylate and dichloromethane; stirring under a nitrogen atmosphere; purifying to obtain a double-tailed hydrophobic monomer; mixing core-shell Fe3O4 / SiO2 composite nanoparticles, ethanol aqueous solution, KH570, and ammonia solution; stirring; purifying to obtain modified SiO2 / Fe3O4; adding acrylamide, acrylic acid, sodium 2-acrylamido-2-methylpropanesulfonate, the double-tailed hydrophobic monomer, and modified SiO2 / Fe3O4 to water; adjusting the pH value; mixing and stirring with nitrogen gas; adding an azo initiator; stirring; cooling; purifying; vacuum drying; and pulverizing into powder to obtain the dry powder drag-reducing agent for fracturing fluids. This invention achieves good drag-reducing performance while also possessing certain heat resistance, making it better suited for fracturing operations in drilling processes.

The invention relates to the technical field of drag reducers, and discloses a preparation method of a comb-type salt-resistant fracturing drag reducer, which comprises the following steps: adding a chitosan-based polymer, modified graphene, polyoxyethylene resin, potassium chloride, acrylamide and water into a stirrer, and stirring to obtain the comb-type salt-resistant fracturing drag reducer. A plurality of side chains in the chitosan-based polymer can generate a steric hindrance effect, and the flow resistance of the fracturing drag reducer in pipelines and cracks is reduced by reducing the viscosity; salt-resistant monomers such as 2-acrylamide-2-methylpropanesulfonic acid are introduced during synthesis of the chitosan-based polymer, so that the fracturing drag reducer can keep stable molecular structure and performance in a high-salinity environment; graphene in the modified graphene has a layered structure and a self-lubricating property, so that the lubricating coefficient can be reduced, and the resistance between the fracturing resistance-reducing liquid and a pipeline as well as between the fracturing resistance-reducing liquid and a crack is reduced; the ester group has a stable chemical mechanism and is not easy to decompose in a high-salt environment, so that the fracturing drag reducer has a certain salt-resistant effect.