32results about How to "Good drag reduction effect" patented technology

The invention belongs to the technical field of tunnel engineering, and particularly relates to shield tunneling machine anti-drag slurry for stacked tunnel construction and a use method of the shield tunneling machine anti-drag slurry. According to the anti-drag slurry, bentonite, anhydrous Na2CO3 and water are used as main raw materials, a certain amount of a lubricant and a nanometer material are added into the slurry to prepare the anti-drag slurry, the stress condition between a shield tunneling machine shell and a soil body is monitored in real time, the grouting amount and the grouting pressure of the anti-drag slurry are dynamically adjusted according to the change of soil pressure, and therefore the anti-drag effect of the shield tunneling machine is achieved. The friction force between the shield tunneling machine shell and the surrounding soil body can be reduced, disturbance of the shield tunneling machine shell to the soil body is reduced, consolidation settlement of the soil body in the later period is reduced, and materials and methods are provided for stacked tunnel construction.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a preparation method of a super-smooth surface based on modified composite particles, which comprises the following steps: spraying an organic-inorganic hybrid adhesive on the surface of a substrate for curing, and then spraying a modified composite particle dispersion liquid on the surface of the organic-inorganic hybrid adhesive for curing, thereby obtaining the super-smooth surface based on the modified composite particles. And finally, soaking the substrate loaded with the modified composite particles in lubricating oil added with a photoinitiator, and irradiating under ultraviolet light to obtain the super-smooth surface based on the modified composite particles. The prepared super-smooth surface based on the modified composite particles is excellent in performance, and the wear resistance, the mechanical strength and the like of the super-smooth surface can be enhanced.

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 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.

The application provides a kind of mixed laminar flow control tail optimization design method of comprehensive multi-condition and multi-constraint, comprising the following steps: according to the optimization target and constraint condition of multiple actual conditions of vertical tail, the optimization mathematical model of vertical tail is established;Design variables are constructed;The design variables include vertical tail geometric parameter design variables and vertical tail suction coefficient design variables;Based on the vertical tail reference configuration, the optimization design space of each design variable is determined;Optimization design is carried out.The application has good multi-condition and multi-constraint processing capability, can consider the balance of friction resistance and pressure difference resistance in optimization design, while ensuring that the stall characteristics of vertical tail do not deteriorate during take-off and landing stage, and the laminar flow range of airfoil does not change abruptly under small side slip state, and can consider various complex engineering constraints, thereby effectively improving the drag reduction effect of mixed laminar flow control tail, and making the design result more in line with actual engineering needs.

The invention relates to the technical field of pipelines, discloses a turbulence inhibitor of airflow, preparation and application of the turbulence inhibitor and a gas conveying method, and aims to solve the problem of over-high energy consumption caused by pipeline friction resistance in pipeline transportation of gas. The turbulence inhibitor comprises microparticles, the length of the microparticles is larger than or equal to eta and smaller than or equal to Lx, and Lx is the turbulence integral scale; eta is the Kolmogorov scale, eta = (v3 / epsilon) 1 / 4, and v is the kinematic viscosity of the airflow; epsilon is the turbulent flow energy dissipation rate. The turbulence inhibitor has the advantages of being high in applicability, excellent in drag reduction effect, economical, capable of saving energy and the like.

This invention discloses a variable cross-section tail wing suitable for FSAE racing cars, comprising a variable cross-section wing assembly, an upper sparsity wing, a first lower sparsity wing, a second lower sparsity wing, and endplates. The variable cross-section wing assembly consists of a main wing, a first flap, and a second flap; all three wings are variable cross-section wings. The variable cross-section wing is a small, continuous section raised at mid-span. The main wing, the first flap, and the second flap are sequentially mounted between the two endplates, roughly diagonally distributed, with the second flap featuring a grunt flap. The upper sparsity wing is mounted on the corner of the endplate, while the first and second lower sparsity wings are located near the bottom of the endplate. There are two endplates, symmetrically mounted on both sides, each featuring louvers, an outer edge flange, a leading edge notch, a trailing edge notch, and guide strips. The variable cross-section wing can reduce the turbulence caused by the headrest and minimize airflow slippage in the spanwise direction, resulting in a more uniform pressure distribution on the wing surface. The louver structure also reduces drag.

The invention belongs to the field of hypersonic active flow control, and discloses a drag reduction and heat protection system and method for a hypersonic aircraft, and the method combines two active flow control methods of energy deposition and magnetofluid flow control. The excellent drag reduction characteristic of energy deposition can bring a good drag reduction effect to an aircraft, meanwhile, energy deposition can serve as an auxiliary ionization technology, and the magnetic control effect of magnetic fluid flow control is improved by improving the fluid conductivity; due to the outstanding thermal protection performance of magnetic fluid flow control, an excellent thermal protection effect is brought to the aircraft after heat flow increase in a part of time periods caused by the energy deposition process is treated; meanwhile, the problems of resistance impact and oscillation caused by pulse energy deposition are fully inhibited under the action of the magnetic field Lorentz force; by the adoption of the method, a better hypersonic speed drag reduction and heat protection effect is achieved, the resistance borne by the hypersonic speed aircraft can be effectively reduced, the heat protection capacity of the aircraft is improved, and the method has wide application prospects.

The invention relates to a ship stern near-hull flow field adjusting method, which comprises the following steps of: 1, calculating a flow field near a hull according to a ship type and a working condition, and selecting a position where a spoiler is arranged; according to numerical calculation and a model test, a streamline near a stern and a hull is obtained, and a spoiler is arranged at the downward flowing position of the streamline in front of a stern shaft; 2, evaluating the drag reduction effect corresponding to each attack angle by adopting numerical calculation; comparing the total resistance value R0 before the spoiler is additionally mounted with the total resistance Ri of the ship after the spoiler is additionally mounted to determine which attack angle is finally adopted; 3, evaluating the ship resistance reducing effect of the spoiler, and judging whether the scheme of the spoiler continues to be modified or not according to the effect; the anti-drag effect of the device is verified by means of numerical calculation or model test and the like. The spoiler is arranged on the ship body in front of the tail shaft, and water flow is adjusted from obliquely downward flow to horizontally backward flow, so that the resistance of the ship is reduced, and the propelling efficiency of the propeller is improved.

The embodiment of the present application provides a method for correcting the position of a following vehicle, including: obtaining image information of a preceding vehicle; determining the vehicle type information of the preceding vehicle based on the image information of the preceding vehicle; determining the modification information of the preceding vehicle based on the image information of the preceding vehicle and the vehicle type information of the preceding vehicle; selecting a corresponding three-dimensional flow field simulation modification model based on the modification information of the preceding vehicle and the vehicle type information; and correcting the following position of the current vehicle according to the three-dimensional flow field simulation modification model. In this way, by obtaining the modification information of the preceding vehicle and the vehicle type information of the preceding vehicle, determining the three-dimensional flow field simulation modification model of the preceding vehicle based on the modification information and the vehicle type information of the preceding vehicle, and correcting the following position of the current vehicle based on the three-dimensional flow field simulation modification model of the preceding vehicle, the following position of the current vehicle is controlled to be within the negative pressure area of ​​the tail vortex of the preceding vehicle, thereby improving fuel economy.

The present invention discloses a drag reduction method for an impeller blade of a bionic fish scale structure, comprising the following steps: S1, obtaining a fish scale sample, selecting a fish scale with a standard appearance from the fish scale sample; S2, collecting the coordinate points of the outer contour of the fish scale, fitting and correcting the collected coordinate points to obtain a scale body curve; S3, arranging the scale body obtained in step S2 in a predetermined arrangement in the drag reduction area of ​​the airfoil body, and performing three-dimensional modeling to obtain the impeller blade. The present invention effectively reduces the airfoil surface resistance by arranging the scale body at intervals on the airfoil body surface, greatly improving its drag reduction performance, especially under low flow rate conditions, the drag reduction effect is very remarkable, greatly reducing the friction resistance between the wall and the fluid, achieving a significant improvement in the drag reduction characteristics, the airfoil surface shear stress is evenly distributed, the friction resistance is evenly distributed, the stress concentration problem is solved, and the phenomenon of hydraulic machinery blades being damaged due to stress concentration is effectively improved.

This invention discloses a method for preparing a superhydrophobic drag-reducing coating and its application in a manta ray-inspired submersible prototype, belonging to the technical field of underwater drag reduction and surface functional materials. The method includes: dispersing micron-sized SiO2 and nano-sized SiO2 in ethyl acetate to obtain a first dispersion; dispersing PDMS in ethyl acetate to obtain a second dispersion; mixing and stirring the first and second dispersions, then adding a curing agent and long-chain perfluoroalkyl silane PFDTES, followed by spraying and curing to obtain a PFDTES-PDMS@SiO2 coating. This invention achieves a water contact angle >150° and a roll-off angle <9° through the synergistic effect of PFDTES long-chain fluorination modification, PDMS flexible bonding, and the micro / nano dual-scale SiO2 hierarchical structure. In the manta ray-inspired submersible application, a drag reduction rate of 14.43% is achieved at a flow rate of 0.5 m / s, and the performance remains stable after 24 hours of dynamic water flow impact. This invention features a simple process, controllable cost, and is suitable for drag reduction functionalization of complex curved underwater equipment.

The invention relates to the technical field of fracturing fluids, and discloses a drag reducer for fracturing and a preparation method thereof.15 # white oil, acrylamide, Tween 60, epoxidized triton, quaternized silane polymer and water are added into a stirrer and stirred, and the drag reducer for fracturing is obtained after stirring is finished. In the stirring process, an epoxy group in epoxidized triton and a hydroxyl group in a quaternized silane polymer are subjected to a ring-opening reaction to generate new hydroxyl groups, and the new hydroxyl groups and the quaternized silane polymer are crosslinked to form a compact network, so that the anti-shearing capability is better, meanwhile, the flow resistance of fluid in a shaft is reduced, and a better resistance reducing effect is achieved; a boron element in the quaternized silane polymer and a polymer in the drag reducer are subjected to a cross-linking reaction to form a stable gel, and the gel has excellent fracture forming and sand carrying capacities; wherein the quaternary ammonium salt and the silane also have a relatively good drag reduction effect.

The application discloses a fabric evaluation and screening method based on a multi-level performance index, relates to the technical field of functional sportswear, and comprises the following steps: constructing a multi-level evaluation index system comprising a drag reduction performance, a light weight performance, a tensile performance and a compression performance; determining objective weights of each evaluation index based on an entropy weight method of wind tunnel aerodynamic test data and fabric multi-physical performance test data; and determining subjective weights of each evaluation index based on an analytic hierarchy process method of constructing a judgment matrix based on expert cognitive evaluation; constructing a fabric comprehensive quantitative evaluation model, and realizing performance evaluation, screening and partition application of candidate fabrics based on the evaluation model, so that the optimal configuration of fabric performance in different sports areas is realized, the overall aerodynamic drag reduction performance, compression performance and sports fitness of competitive clothing are effectively improved, and the problems of insufficient engineering basis in the fabric selection process of clothing, difficult unified quantitative representation of performance indexes and insufficient multi-performance collaborative optimization capability are solved.

The present invention belongs to the field of ship technology, and relates to an efficient drag reduction buoy system for unmanned hydrofoil vessels based on air film stabilization control. The system includes a buoy, an airflow conduction system, a sensor system, a control system and an actuator; the airflow conduction system includes an air supply system and an airflow conduction groove; a one-way exhaust hole is arranged at the bottom of the buoy, and is connected to the air supply system through a pipeline; the airflow conduction groove is V-shaped and distributed along the central axis of the buoy at the bottom of the buoy, and one end thereof is connected to the one-way exhaust hole; the sensor system is arranged at the bottom of the buoy; the control system includes a data acquisition module and a control mainboard; the data acquisition module is used to collect data from the sensor system and transmit it to the control mainboard; the control mainboard is used to execute an adaptive control algorithm and output a control signal to the actuator to adjust the output of the airflow in real time. The present invention can analyze the data fed back by the sensor in real time, adjust the airflow output, and realize adaptive adjustment of the air film under different water flow, speed, and pressure changes.

The application discloses a preparation method of ultrahigh molecular weight poly-alpha-olefin, which uses one or more alpha-olefins as polymerization monomers, and carries out polymerization reaction under the action of a catalyst at-30-30 DEG C; the catalyst comprises a main catalyst, a cocatalyst and an external electron donor; the main catalyst is a solid catalyst component, which comprises magnesium, titanium, chlorine and an internal electron donor, and the mass ratio of the four is 1:10-100:20-400:1-5; the internal electron donor contains at least one dihydric alcohol ester compound; the cocatalyst is an alkyl aluminum compound; the external electron donor is selected from organosiloxane; and the molar ratio of the main catalyst (calculated according to titanium): the cocatalyst (calculated according to aluminum): the external electron donor (calculated according to silicon) is 1:10-500:0-500. The poly-alpha-olefin prepared by the method has a weight average molecular weight close to 10 million, and the drag reduction agent prepared from the poly-alpha-olefin has excellent drag reduction performance.

The present invention belongs to the field of oil production technology, and is specifically related to a kind of acid liquid thickener and its preparation method and application. The synthesis method is as follows: add butene glycol, 4,4'-diaminobenzylbenzene-2,2'-disulfonic acid, (2-acrylamidoethyl) phosphonic acid, potassium dihydrogen phosphate, deionized water in the first reactor, stir evenly, and adjust pH7-8; add (3-acryloxypropyl) tris(trimethylsiloxy) silane, deionized water, hydroxypropyl methylcellulose, OP-10, potassium dihydrogen phosphate in the second reactor, and adjust pH7-8; add initiator to the high-position drip tank, add dropwise to the second reactor, and when the viscosity starts to rise, quickly add the first reactor mixed liquid, heat up, and keep warm to react to obtain a viscous liquid; dry and granulate to obtain the product. The present invention has the advantages of simple synthesis, high apparent viscosity, strong shear resistance, good salt resistance and hardness resistance, and good drag reduction effect.

The invention discloses a maleimide / α-olefin multipolymer, a maleimide / α-olefin multipolymer oil-soluble drag reducer, and a preparation method and application thereof, and belongs to the technical field of oilfield chemical additives. The maleimide / α-olefin multipolymer is obtained by olefin coordination polymerization of maleimide in a polymerization monomer mixture and double bonds in α-olefins under the catalytic action of a Ziegler-Natta catalyst; the polymerization monomer mixture is composed of the following components in molar percentage: 10% to 15% maleimide, 50% to 70% α-olefins with a chain length of C6-C9, and 10% to 20% α-olefins with a chain length of C6-C9. 10 ‑C 11 10% to 20% of the chain length of α-olefins, the rest is C 12 ‑C 15 The present invention uses maleimide / alpha-olefin multipolymer as a component of the drag reducer, which is beneficial to improving the drag reduction performance.

An arc plasma-enhanced trench turbulent friction drag reduction device is provided, comprising a trench wall (1) and an arc electrode assembly (2). The trench wall (1) is formed by multiple trenches extending along the flow direction and equidistantly distributed along the spanwise direction. The arc electrode assembly (2) is arranged in an array on the trench wall (1). A corresponding drag reduction method is also provided: a sensor is placed in the flow field to collect flow field data and inputs the data into a controller; the controller analyzes the data and selects the working mode and parameters accordingly; the sensor collects flow field data again to gather flow field information after arc discharge; the controller analyzes the data again, measures the surface friction resistance, and compares the change in friction resistance before and after arc discharge. If the expected drag reduction effect is achieved, the operation ends; otherwise, it returns to the second step to select a new working mode or discharge state. This invention combines actively controllable arc plasma discharge with passive trench flow control technology, which can achieve effective drag reduction under complex inflow conditions in actual flight.

The invention discloses a bubble diversion super-hydrophobic composite material and a preparation method and application thereof, and belongs to the technical field of chemical functional materials. Preparing a stable bubble layer; and coating a super-hydrophobic coating: uniformly mixing and dispersing hydrophobic silicon dioxide particles and n-hexane to obtain a super-hydrophobic suspension, uniformly coating the surface of the bubble layer with the obtained super-hydrophobic suspension, and naturally standing or heating and standing in a ventilation environment to form the super-hydrophobic coating, thereby obtaining the product. The bubble layer is prepared on the surface of the micron-scale columnar structure, so that the surface super-hydrophobic stability is enhanced, the service life of the super-hydrophobic surface is prolonged, the resistance reduction performance of the surface in fluid is improved, the friction resistance is reduced, the operation efficiency is improved, the excellent anti-icing capacity is achieved, the icing phenomenon is effectively prevented, and the service life of the super-hydrophobic surface is prolonged. And due to the self-cleaning function, dust and pollutants on the surface can be automatically removed through rolling of liquid drops, and the maintenance requirement is reduced.

The application provides a pressure fracturing and oil displacement integrated working fluid based on amphiphilic carbon dots, a preparation method and application thereof, and belongs to the field of oil field chemistry, wherein the preparation method comprises the following steps: dissolving a first non-ionic monomer, a first salt-tolerant anionic monomer, a long carbon chain cationic monomer, a crosslinking agent and a first initiator in water, performing hydrothermal reaction at 160-200 DEG C, and cooling to obtain an amphiphilic carbon dot mother liquor; adding a second non-ionic monomer, a second salt-tolerant anionic monomer, an inorganic salt and a second initiator into the amphiphilic carbon dot mother liquor, and performing polymerization reaction to obtain the pressure fracturing and oil displacement integrated working fluid. The application synthesizes amphiphilic carbon dots as oil displacement functional units and nano stabilizers, and then uses the same as a dispersion medium to obtain a composite working fluid containing a high molecular resistance reducing agent through water dispersion polymerization reaction; the high molecular in the working fluid provides fracturing resistance reduction performance, the amphiphilic carbon dots provide interfacial activity and wetting modification performance, and the two are integrated to realize the functions of fracturing resistance reduction and oil displacement enhanced oil recovery.

The present invention proposes a corrugated drag reduction functional surface microstructure, which belongs to the field of microstructures, including a substrate on which a plurality of grooves are arranged; the plurality of grooves are arranged in a row along a preset direction, and the plurality of rows of grooves are arranged along a direction perpendicular to the preset direction, the grooves are composed of two groove segments that are mirror-symmetrical relative to the vertical direction of the preset direction, and the adjacent ends of the two groove segments that constitute the same groove are butt-connected, the extension directions of the two ends of the groove segments intersect, and the adjacent two groove segments of two adjacent grooves in the same row are cross-arranged and interconnected; a plurality of grooves are arranged vertically and horizontally on the substrate surface and each groove is a structure composed of two groove segments that are mirror-symmetrical, and because the extension directions of the two ends of the groove segments intersect, fish scale-like patterns are formed on the substrate surface, so that the formed pattern structure has good drag reduction capability consistent with different fluid directions.

The application discloses a liquid static pressure bearing with oil sealing surface air cushion drag reduction structure, which comprises a bearing body, an oil sealing surface air cushion drag reduction structure, a circumferential oil return groove and an axial oil return groove. A plurality of oil sealing surface air cushion drag reduction structures are arranged on the circumferential and axial holes of the bearing body. Each oil sealing surface air cushion drag reduction structure is composed of a rectangular oil sealing surface, a rectangular oil inlet groove, an oil inlet hole and a plurality of air inlet holes. The air inlet holes are densely distributed on the rectangular oil sealing surface close to the rectangular oil inlet groove. An air flow control unit is arranged in each air inlet hole. The circumferential oil return groove separates the circumferentially distributed oil sealing surface air cushion drag reduction structures, and the axial oil return groove separates the axially distributed oil sealing surface air cushion drag reduction structures. The oil sealing surface air cushion drag reduction structure can be widely applied to liquid static pressure linear bearings, radial bearings and thrust bearings, has good drag reduction effect and compact structure, and can obtain a liquid static pressure bearing with low heat generation, high stiffness and super-precision.

The present invention discloses a high-strength anti-sewage gel coating and a preparation method and application thereof, which belongs to the technical field of hydrogels. The preparation method comprises: (1) soaking a base material in a first solution for pretreatment, taking it out and drying it to obtain a pretreated base material; the solvent of the first solution comprises acetone, and the solute comprises polyvinyl acetate and an initiator; (2) using a water-soluble monomer, a zwitterionic monomer and a cross-linking agent as raw materials to initiate ultraviolet light polymerization on the surface of the pretreated base material to obtain the high-strength anti-sewage gel coating; the cross-linking agent is at least one of nano aluminum hydroxide, trehalose and fumed silica. The preparation method of the present invention has mild reaction conditions and a simple and easy process. The prepared high-strength anti-sewage gel coating has the dual effects of anti-fouling and drag reduction, and has a strong bonding force with the base material.

The application discloses a bogie bottom drag reduction cladding plate and a high-speed train bogie, and the cladding plate comprises a torsion bar cladding plate for cladding a torsion bar of a bogie frame, a first cladding plate for connecting a cross beam on one side of the torsion bar, and a second cladding plate for connecting a cross beam on the other side of the torsion bar. The first cladding plate and the torsion bar cladding plate form a first flow guide slope, the second cladding plate and the torsion bar cladding plate form a second flow guide slope, and the flow guide directions of the first flow guide slope and the second flow guide slope are symmetrically arranged. The application guides the airflow originally acting on the region near the center pin hole and the torsion bar to the lower side of the torsion bar cladding plate, optimizes the partial cladding and flow guide of the originally complex and abrupt bottom profile near the center pin hole and the torsion bar, forms a relatively continuous bottom flow guide surface, weakens the direct interference between the airflow and the complex components of the bottom, reduces the local flow separation, backflow and vortex intensity, improves the bogie bottom flow field distribution, and further achieves the purpose of reducing the aerodynamic drag of the bogie region.

The invention provides a resistance reduction design method for a bogie area key configuration, the bogie area key configuration comprises a bogie cabin apron board configuration, a bogie cabin front and rear end configuration, a bogie bottom plate configuration and a bogie bottom plate combination configuration, and the method comprises the following steps: designing the bogie cabin apron board configuration; the bogie cabin apron board structure with the best whole vehicle drag reduction effect is obtained; designing front and rear end structures of the bogie cabin to obtain the front and rear end structures of the bogie cabin with the best whole vehicle drag reduction effect; a bogie bottom plate structure is designed, and a bogie cabin bottom plate structure with the best whole vehicle drag reduction effect is obtained; and a bogie bottom plate combination configuration scheme is designed, and the scheme that the whole vehicle drag reduction effect meets the requirement and the comprehensive condition is optimal is obtained. Compared with a single structure in the prior art, the damping device is more reasonable and reliable, and the damping effect on the whole vehicle is better.

The invention discloses a water-rich sand layer pipe-jacking construction resistance-reducing seepage-proofing agent and a preparation method thereof. The resistance-reducing seepage-proofing agent comprises seepage-proofing slurry and resistance-reducing slurry, the anti-seepage slurry comprises the following raw materials: 30-40 parts of a polyurethane component, 2-5 parts of epoxy resin and 5-15 parts of an inorganic material; the anti-drag slurry is prepared from the following raw materials: 10 to 15 parts of graphite, 10 to 15 parts of sodium carbonate and 2 to 5 parts of polyacrylamide; respectively dispersing an anti-seepage slurry raw material and a drag reduction slurry raw material in water to obtain an anti-seepage slurry with the mass concentration of 30-50% and a drag reduction slurry with the mass concentration of 5-20%; and uniformly mixing the anti-seepage slurry and the anti-drag slurry according to the mass ratio of (1-99): (99-1) to obtain the anti-drag anti-seepage agent. The anti-drag anti-seepage agent has high water-retaining property, anti-permeability, stability and controllable thixotropic property, can meet the requirements of complex stratums in the long-distance pipe-jacking construction process, and particularly can effectively control seepage and reduce the frictional resistance of the pipe wall in a water-rich sand layer environment.

The invention relates to the technical field of oil and gas field exploitation, in particular to a drag reducer for oil and gas gathering and transportation and application thereof.The drag reducer comprises a first polymer molecule and a second polymer molecule, and the first polymer molecule and the second polymer molecule are combined through the intermolecular association effect; the first polymer molecule is prepared from the following preparation raw materials: hexadecyl methacrylate, ethylene glycol mono-9-octadecene-1-ether, allyl triethyl ammonium chloride, azobisisoheptonitrile, polyethylene glycol monooctyl phenyl ether, hydroxyethyl cellulose, modified nano aluminum oxide and an interface compatilizer; the second polymer molecule is prepared from the following preparation raw materials: hexadecyl methacrylate, styrene p-propanesulfonate, 3, 7-dimethyl-6-octenoic acid, azobisisoheptonitrile, polyethylene glycol monooctyl phenyl ether, hydroxyethyl cellulose, organic modified nano diatomite and an interface compatilizer; through association of two specific polymer molecules, the prepared drag reducer has strong shear resistance and high drag reduction rate.

The invention discloses a long-term stable high-temperature drag reducer and a preparation method thereof, and belongs to the technical field of pipeline turbulent flow drag reduction, and the preparation method comprises the following steps: fully dispersing 20-30% of erucamide propyl trimethyl ammonium chloride in water, then adding 60-75% of stabilizer sodium salicylate, fully stirring, and then adding 20-30% of sodium salicylate, and fully stirring; and finally, adding 1%-3% of a defoaming agent and 2%-3% of a preservative. According to the long-term stable high-temperature drag reducer and the preparation method thereof, the drag reducer has the advantages of higher drag reduction rate at 60-110 DEG C, high stability, high shear recovery, low cost, easiness in operation and long drag reduction service life, and effective drag reduction can be maintained within at least two months.