439results about How to "Good drag reduction effect" patented technology

A composition including polyalphaolefins that function as drag reducing agents and a process for the preparation of polyalphaolefins that function as drag reducing agents are disclosed. The process includes contacting alpha olefin monomers with a catalyst system, which includes a catalyst and an activator (co-catalyst) in a reactant mixture. The catalyst is a transition metal catalyst, preferably titanium trichloride, and the co-catalyst may include an alkylaluminoxane, alone or in combination, with a dialkylaluminum halide or a halohydrocarbon. The polymerization of the alpha olefin monomers produces a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of at least 10 dL/g. The addition of the alkylaluminoxane during the polymerization process provides for a non-crystalline, ultra-high molecular weight polyalphaolefin and a more uniform molecular weight distribution of the resulting polyalphaolefin, thereby creating a drag reducing agent superior to known drag reducing agents. A process for forming a drag reducing agent comprising a non-crystalline, ultra-high molecular weight polyalphaolefin having an inherent viscosity of about at least 10 dL/g and a process for reducing drag in a conduit are also disclosed.

The invention belongs to the field of oil transportation, and particularly relates to a crude oil viscosity-breaking pour-point depressant composition, and a preparation method and application thereof. At the temperature of higher than plasticizing temperature of organic pour-point depressant, 0-3% by mass of coupling agent, 0-10% by mass of high-molecular processing assistant, and the balance ofinorganic pour-point depressant and organic pour-point depressant are melted, uniformly mixed and granulated to obtain the crude oil viscosity-breaking pour-point depressant composition. The crude oil viscosity-breaking pour-point depressant composition is uniformly dispersed in a liquid dispersion medium, and proportionally injected into crude oil, so that the crude oil can be transported. The inorganic pour-point depressant and organic pour-point depressant in the crude oil viscosity-breaking pour-point depressant composition have a synergetic effect, and can effectively lower the solidifying point and viscosity of the waxy crude oil, so that the crude oil has favorable fluidity at low temperature and favorable rheologic timeliness, thereby enhancing the crude oil transportation efficiency and safety level and lowering the transportation cost.

The invention discloses a pyridine saline gas transmission pipeline drag reduction agent and a preparation method thereof. The pyridine saline gas transmission pipeline drag reduction agent is prepared from pyridines compounds, fluo phosphate, and halogenated hydrocarbon according to the mol ratio of 1:1:1-1.5:2:1. The preparation method comprises the following steps: adding the pyridines compounds and the halogenated hydrocarbon of the proportional quantities into a reaction vessel, and under the condition of stirring the mixture in the inert atmosphere, controlling the reaction temperature and reflux for reaction; after the reaction is finished, stopping heating, and cooling the reaction mixture, wherein the upper layer of the reaction mixture is yellowish liquid, and the lower layer of the reaction mixture is a white crystal; in the inert atmosphere, pouring out the yellowish liquid on the upper layer, and crashing the white crystal for suction filtration; putting the white crystal into a heat insulating purifier, adding a solvent into the heat insulating purifier, and in the inert atmosphere, re-crystallizing the mixture for 2-3 times to obtain a white crystal; adding an organic solvent, the white crystal and the fluo phosphate in a certain proportion into the reaction vessel, stirring the mixture in the inert atmosphere, and controlling the temperature for reaction; after the reaction is finished, carrying out suction filtration on the liquid rapidly, and removing undissolved substances to obtain a crude product containing the solvent; and steaming a small amount of the organic solvent from the crude product by a rotary evaporator, then putting the crude product in a vacuum oven to make the organic solvent steamed radically, and obtaining a product.

The invention discloses sulfuric acid ester gas pipeline drag reduction agents for drag reduction of long-distance pipelines of gas, particularly natural gas and a preparation method thereof. The drag reduction agents are formed by sulfuric acid esters, aromatic compounds and heterocyclic compounds according to the molar ratio of 1:5:1-1.5:10:1. The preparation method comprises the steps of: 1) adding a heterocyclic compound and an aromatic compound with certain proportion into a reactor, adding nitrogen for protection, and stirring for fixed time period at low temperature, and then adding sulfuric acid ester; 2) reacting for certain time to ensure that a formed liquid is changed into opacity and layering from initial lucidity and transparency; 3) using extraction layering to separate a residual liquid and a generated sulfuric acid ester drag reduction agent; and 4) distilling a residual liquid of an organic solvent under reduced pressure to obtain a product in vacuum. The drag reduction agents have obvious effect on the drag reduction of gas pipelines, have the advantages of direct raw material sources, simple operation, mild reaction conditions, relatively simple process and low requirement on equipment, and are easy to realize mass industrialized production.

The invention relates to a manufacture method of a transformative shark-simulation anti-drag skin based on adjustable surface appearance and size, which comprises the following four steps:(1) manufacturing a shark-skin biometric template; (2) manufacturing a silicon rubber elastic female template; (3) manufacturing a transformative shark-appearance-simulation anti-drag skin and researching a law;and (4) manufacturing the transformative shark-appearance-simulation anti-drag skin according to the requirements of application objects. The elastic female template manufactured by applying the invention has more than 95% of similarity to that of original shark skin appearance, the size of the skin surface appearance of the shark-simulation anti-drag skin manufactured by applying the invention can be adjusted according to the parameters of the common speed, the dielectricviscosity and the like of the application objects, and the anti-drag effect of the shark-simulation anti-drag skin approaches the optimum state. The manufacture method of a transformative shark-simulation anti-drag skin based on adjustable surface appearance and size has good utility value and wide application prospects in the field of simulation manufacture technology.

The invention discloses a method for synthesizing gemini long chain alkyl quaternary ammonium salts by enabling long chain alkyl tertiary amine mixture to be reacted with dibromo hydrocarbon or epoxy chloropropane and an application as a drag reduction and energy conservation agent of a circulating water system. The method comprises the following steps: stirring and dissolving the long chain alkyl tertiary amine mixture in an organic solvent, and heating to reflux temperature; slowly adding dibromoethane or epoxy chloropropane for generating mixture of asymmetric and symmetric gemini long chain alkyl quaternary ammonium salts; stopping the reaction when the tertiary amine conversion rate is above 75%, and performing vacuum evaporation for recovering the solvent; and using deionized water to dissolve distillation products, and oxidizing the non-converted raw material to tertiary amine oxide with hydrogen peroxide at the temperature of 60-80 DEG C. A gemini quaternary ammonium salt surfactant is used as main molecules of the drag reduction agent, an organic acid corrosion inhibitor is used as auxiliary ions, the molar ratio of the main molecules to the auxiliary ions is 1: (2.4-6.0), then the drag reduction agent which is applicable to the range of 5-95 DEG C is prepared, and the drag reduction efficiency of the drag reduction agent to the circulating water system achieves 40%-70%, and the corrosion inhibition efficiency achieves 60%-95%. By adopting the gemini long chain alkyl quaternary ammonium salt surfactant, the problems of strong corrosion, great irritation and a narrow range of applicable temperature of the traditional long chain alkyl quaternary ammonium salt surfactant can be overcome.

The invention discloses a slippery water fracturing fluid with ultra-low interfacial tension with crude oil after degradation. The slippery water fracturing fluid is prepared from an ultra-low interfacial tension drag reducer, a demulsify-cleanup additive, a clay stabilizer and a degrading agent. A preparation method of the slippery water fracturing fluid comprises steps as follows: 0.02%-0.10% in percentage by mass of the ultra-low interfacial tension drag reducer, 0.1%-0.2% in percentage by mass of the demulsify-cleanup additive and 0.3% in percentage by mass of the clay stabilizer are added to every ton of water, the agents are mixed to form a homogeneous solution, and 0.08% of the degradation agent is added from a mixing tank of blending equipment during construction. Additives of the slippery water fracturing fluid are all liquid phase, and the slippery water fracturing fluid can be quickly dispersed in water, have good salt tolerance, are not easily affected by the content of bacteria in a fluid preparation solution and have a stable drag reduction effect under the construction displacement of 6-20 m<3>/min; when applied to improvement of low-permeability oil and gas reservoirs, the slippery water fracturing fluid can reduce the interfacial tension between a gel breaking liquid and crude oil and reduce string and construction friction, helps production of the crude oil, increases of the yield of the crude oil and can be prepared repeatedly from backflow fracturing fluids.

A process for preparing the alpha-olefine as the drag reduce used for delivering oil in pipeline includes such steps as loading monomers into reactor, adding catalyst while stirring in the condition of isolating air, adding the oil-soluble polyester, polyether or ester-ether copolymer solution to which the alpha-olefine polymer is not dissolved, and reacting at -50-20 deg.C for 3-10 days. Its advantages are simple process, and high molecular weight, high effect, high stability and low viscosity of product.

The invention discloses a flexible MEMS resistance-reducing skin and a manufacturing method thereof used for reducing skin friction resistance during the advancing of on-water or underwater vehicles, which employs micro-fine resident bubbles to reduce resistance and belongs to the fields of micro-machinery and fluid dynamics. The upper surface of the skin is a surface layer coated with micro-pit arrays and processed by surface soakage; electrolytic anodes and cathodes of comb-shaped micro-fine planar metal, which are attached on an insulating layer, are arranged at the bottom of the micro-pits; a flexible substrate is positioned below the insulating layer; wire leading terminals for electrodes are arranged on the lower surface of the skin; and both the surface layer and the substrate are made by flexible materials. The overall thickness of the resistance reducing skin is at sub-millimeter level, and the skin is in the status of flexible film. The manufacturing method is an MEMS micro machining technique compatible with the flexible MEMS technology. The flexible MEMS resistance-reducing skin is coated on the outer surfaces of the on-water or underwater vehicles, with power thereof supplied by the on-water or under-water vehicles. Micro-bubbles stably residing in the micro-pits are formed by water electrolysis reaction to coat most parts of the surfaces of the on-water or under-water vehicles, thus realizing the function of reducing skin friction resistance.

The invention discloses a method for copying a sharkskin surface micro groove structure and belongs to the technical field of biological constraint molding. The method is characterized by comprising the following implementation steps: pretreating sharkskin; blowing mold release agent; pouring unsaturated resin; vacuumizing; releasing the unsaturated resin from a mold; blowing mold release agent; pouring liquid silicon rubber; vacuumizing; and releasing the liquid silicon rubber from a mold. The silicon rubber simulation sharkskin thin film obtained by the steps can copy the surface with a riblet micro groove structure of a shark completely and clearly and can be widely used in fields of resistance reduction in aircraft, ship and oil pipe projects and other projects.

The invention provides high-temperature resistant CO2 foam cleaning and associated fracturing fluid and a preparation method and application thereof. The high-temperature resistant CO2 foam cleaning and associated fracturing fluid comprises a fracturing fluid base solution, a cross-linking agent, a gel breaker and liquid CO2, wherein the cross-linking agent and the gel breaker account for 0.3%-0.8% and 0-0.05% of the fracturing fluid base solution in parts by weight separately; and the liquid CO2 accounts for 30%-70% of total volume of the CO2 foam cleaning and associated fracturing fluid. The high-temperature resistant CO2 foam cleaning and associated fracturing fluid provided by the invention has the characteristics of being few in additive types, simple in preparation, controllable in crosslinking, low in residue, low in damage, low in friction, high in foaming efficiency, high in flowback rate and resistant to high temperature.

The invention discloses a controlled manufacturing method for a shark imitated drag reduction surface structure under a variable environment. The method comprises the following steps of: 1, preparing an original-ratio sharkskin biological female template; 2, designing shape parameters of a deformed imitated shark required to be manufactured according to the requirement of an application environment; and 3, preparing a variable-proportion bionic drag reduction skin according to the application environment. The variable-proportion bionic sharkskin shaped drag reduction skin prepared by using the method has a functional structure completely in accordance with the original sharkskin shape, but has different shape parameters. By using the method for making the bionic drag reduction skin, the size of the surface shape of the skin can be adjusted according to the parameters such as common speed, different parts of the outer surface and the medium viscosity of an application object, so that the drag reduction effect of the shark imitated drag reduction skin is in an optimal state. The method has high practical value and broad application prospect in the technical field of bionic manufacturing.

The invention relates to a shale gas well slickwater fracturing fluid system high-efficiency emulsion quick water-soluble drag reducer, belonging to the technical field of oilfield drag reducers. The drag reducer is prepared by initiating polymerization of a component A, a component B and a component C by a free-radical initiator in water, wherein the component A is composed of a plurality of nonionic water-soluble monomers with carbon-carbon double bond; the component B is a water-soluble polymer stabilizer of univalent cationic monomers; and the component C is a univalent cationic inorganic salt. The drag reducer is simple to use, quick to hydrate and convenient to add, is green and environment-friendly, and has the advantages of high dissolution rate, no bubbling, salt resistance, calcium resistance, pollution resistance, high temperature resistance, favorable compatibility, no need of adding defoaming agent and the like; and the drag reduction efficiency can reach 70% when the drag reducer is used in fracturing. The drag reducer solves the problems of high tendency to granulation and low tendency to hydration in the use process of the existing drag reducer using dry powder, and the problem that the poor compatibility among various different ions and chemical assistants in the fracturing fluid can directly influence the feasibility and effectiveness of the slickwater fracturing.

The present invention relates to the technical field of bionics, specifically to a manufacture method for a drag reduction surface. The manufacture method for the diatomite composite drag reduction surface absorbed with a drag reducer comprises: 1) carrying out a diatomite pretreatment process; 2) carrying out a diatomite filtering and screening process; 3) carrying out a diatomite wet blank manufacture process; 4) duplicating and forming a groove morphology of the high-fidelity artificial shark scales; 5) carrying out sintering, curing and direct forming for the diatomite under the artificial shark scale groove morphology constraint; 6) absorbing a sustained release drag reducer on the cured diatomite surface to prepare the diatomite composite drag reduction surface absorbed with the drag reducer. According to the present invention, the drag reducer is absorbed to the artificial shark diatomite composite drag reduction surface, such that the drag reduction function of the artificial shark scale grooves is provided, and the drag reduction function due to sustained release of the self-lubricating mucus by the artificial shark is further provided.

The invention discloses an inverse emulsion drag reduction agent for fracturing a shale gas by using quick water and a preparation method thereof, and relates to the technical field of petroleum engineering. The inverse emulsion drag reduction agent is a macromolecular water soluble polymer which is prepared from acrylamide, sodium acrylate and dodecyl methacrylate copolymerized in an inverse emulsion, and azo diisobutyl hydrochloride and sodium hydrogen sulfite as complex initiation systems. A long-chain hydrophobic monomer is introduced into the drag reduction agent, so that the shear resistance of the drag reduction agent in a high displacement pump injection process is improved, meanwhile, the drag reduction agent is prepared from the inverse emulsion in a polymerization manner, the product is a liquor and instant, the liquor demands of a continuous mixed construction technology for fracturing the shale gas are met, the dosage for field use is 0.06-0.8% of mass of clean water, and the drag reduction rate can be up to 73%.

The invention relates to a self-repairing super-hydrophobic anti-drag elastomer thin film and a preparation method thereof. A sharkskin V-shaped groove structure is copied on the surface of an elastomer, and a polyarcylamide-polyfluoroalkyl acrylate segmented copolymer capable of self assembling and forming a micro-nano structure is further grafted on the surface of the elastomer; thus, the thin film has self-repair super-hydrophobic performance, a static water contact angle can reach 150 degrees or more, and a rolling angle is smaller than 10 degrees. When the anti-drag film is attached to a rotational viscometer rotor to perform an anti-drag performance test, drag reducing efficiency can reach 20%. The self-repairing super-hydrophobic anti-drag elastomer thin film disclosed by the invention has the advantages that 1, a super-hydrophobic anti-drag method and a bionic anti-drag method are combined together, so that the anti-drag film can have a better anti-drag effect under a laminar condition and a turbulent condition; 2, after surface chemical components of polyfluoroalkyl acrylate grated to the surface of the super-hydrophobic film are damaged, the polyfluoroalkyl acrylate can be self repaired after being soaked by a solvent or being heated under high temperature, so that the film can have a super-hydrophobic effect again.