23 results about "Asphaltene deposition" patented technology

The invention relates to the technical field of oil field reservoir damage inhibition, in particular to a carbon quantum dot biological composite material and a preparation method and application thereof. The preparation method of the carbon quantum dot biological composite material provided by the invention comprises the following steps: mixing a scenedesmus extracting solution with an aqueous dispersion of carbon quantum dots, then adjusting the pH value to 8-10, and carrying out a grafting reaction to obtain the carbon quantum dot biological composite material, the scenedesmus extracting solution is a mixed solution of intracellular substances released after scenedesmus cells are broken and water. The carbon quantum dot biological composite material prepared by the method can be used as an asphaltene deposition inhibitor, has the characteristics of greenness, high efficiency and low cost, and can effectively inhibit asphaltene deposition, so that the fluidity of crude oil is improved, reservoir damage is reduced, and the production cost is reduced.

The invention relates to a method for evaluating the stability of heavy oil based on composition distribution of hydrocarbon, which comprises the following steps: detecting composition distribution data of hydrocarbon in a heavy oil sample by adopting high-resolution mass spectrometry equipment, and calculating the instability index of the heavy oil sample according to a specific formula. The sample amount and the solvent amount used for analysis are small, the test process is short in time consumption, the evaluation result is accurate, the reproducibility is good, and the discrimination degree is high; the method is especially suitable for analysis requirements of heavy oil stability in processes of heavy crude oil on-site modification, asphaltene deposition research, heavy oil separation and component refining, heavy ship fuel component blending, inferior residual oil fixed bed hydrogenation, slurry bed hydrogenation, fluidized bed hydrogenation and the like.

The invention discloses an asphaltene deposition regulation and control system, which comprises a fluid circulation unit, a storage tank for accommodating magnetic fluid, a pumping device for driving the magnetic fluid to circulate, and a test pipe section, the temperature control unit comprises a first water bath heater used for adjusting the temperature of fluid in the storage tank, a second water bath heater used for adjusting the temperature of the test pipe section and a temperature monitoring device arranged on the pipeline; the magnetic trapping unit comprises a magnetic field generating device which is arranged outside a specific section of the test pipe section and is used for generating a controllable magnetic field in the specific section so as to attract magnetic components in the magnetic fluid to enable the magnetic components to be directionally enriched; the monitoring control unit comprises a pressure sensing device used for monitoring pressure parameters of the test pipe section and a control device in signal connection with the pumping device, the temperature control unit and the magnetic field generation device, and the control device is configured to regulate and control the operation state of the magnetic field generation device based on the pressure parameters.

This application provides a numerical simulation method, apparatus, and storage medium for asphaltene deposition unblocking, belonging to the field of oil and gas field development technology. The method includes: constructing a thermodynamic component model containing asphaltene based on reservoir fluid composition; calculating oil-solid phase equilibrium conditions using equations of state; setting a critical mole fraction for asphaltene precipitation in the oil phase, where precipitation occurs when the actual mole fraction is greater than or equal to the critical value; setting reaction paths for precipitation and unblocking reactions; establishing a porosity-permeability coupled evolution model, where porosity decreases linearly with solid deposition, and permeability decreases power-lawically with decreasing porosity; embedding the above model into a reservoir numerical simulator, and dynamically updating the asphaltene concentration, solid deposition, porosity, and permeability parameters of each grid through time-step numerical solutions.

The invention relates to an asphaltene deposition inhibitor and a preparation method and application thereof.The asphaltene deposition inhibitor is formed by compounding alkyl pyridine and catalytic diesel oil and can rapidly permeate into crude oil, disperse an asphaltene association body structure, inhibit association, coalescence and deposition of asphaltene and improve the stability of a crude oil colloid system; the cost-reducing and efficiency-increasing development of crude oil is realized. And when being used in the crude oil exploitation process and the storage and transportation process, the asphaltene deposition problem in the crude oil exploitation process and the storage and transportation process is effectively solved, and the production safety risk and the operation cost are reduced.

The invention discloses an oil-soluble asphalt dispersing agent composition and a performance testing method thereof, and belongs to the field of oilfield chemicals, the oil-soluble asphalt dispersing agent composition is prepared by compounding 20-70% of a solvent A, 20-70% of a solvent B, 2-12% of a penetrant, 1-8% of a dispersing agent and 1-9% of an inhibitor, the solvent B is N-(2-mercaptoacetyl) methacrylamide; the invention also discloses a dispersing performance evaluation method of the asphalt dispersing agent, which comprises the following steps: preparing 1g of small balls from the high-asphaltene-content sediment, putting the small balls into a glass sample bottle, and adding the asphalt dispersing agent into the bottle; reacting in a constant-temperature test box at 20-90 DEG C for 2-8 hours, and observing the dissolving and dispersing conditions; after the reaction is finished, filtering by using a loaded steel wire mesh, drying the steel wire mesh and residual sediments in a drying oven, taking out, weighing, and recording the mass of residual insoluble substances; and calculating the asphaltene dissolution rate through the mass loss of the sediment before and after.

The invention belongs to the technical field of extraction equipment, and particularly relates to extraction equipment for waste lubricating oil regeneration, the extraction equipment comprises a supporting base, an extraction mechanism located on the right side of the top of the supporting base and an ultrasonic emission mechanism located outside the extraction mechanism, the extraction mechanism comprises an extraction tower, and the extraction tower is fixedly connected to the right side of the top of the supporting base. The mounting insertion plates on the two sides are controlled by the connecting rods to move oppositely, when the mounting frame is placed at the position of the outer wall of the extraction tower, the mounting insertion plates are pushed to move backwards under the action of the fixing springs, the mounting frame and the extraction tower are fixed at a time, and the limiting insertion rods are controlled by the rotary knobs to be inserted into the limiting insertion holes; secondary fixation of the mounting rack and the extraction tower is realized, ultrasonic waves are transmitted by the transducer, local viscosity is reduced by ultrasonic vibration, asphaltene is inhibited from depositing on a tower plate or a filler, and the problem that the asphaltene is easy to deposit on the tower plate or the filler due to high viscosity of waste oil during extraction of the extraction tower is solved.

The invention discloses an asphaltene deposition prevention system based on a magnetic fluid barrier, and relates to the field of oil and gas exploitation and pipeline transportation, the asphaltene deposition prevention system comprises a pipeline body used for transporting asphaltene-containing crude oil, and the pipeline body is an oil pipeline, preferably a metal pipeline / non-metal pipeline with a smooth inner wall; the magnetic field generation module is used for generating a magnetic field gradient pointing to the center of the pipeline from the pipe wall in the inner wall area of the pipeline body; the magnetic fluid supply module is used for supplying magnetic fluid into the pipeline body, the pipe diameter of the pipeline body is selected according to actual requirements, and the magnetic field generation module adopts an annular array formed by neodymium iron boron permanent magnets and is fixed to the outer wall of the pipeline through an adjustable mechanical support. The magnetic fluid is driven by the magnetic field gradient to form a stable physical isolation layer on the inner wall of the pipeline, so that asphaltene is effectively prevented from being in contact with the pipe wall, and dependence on chemical agents and mechanical cleaning is reduced.

Asphaltene inhibiting compositions include a mixture of a sulfonate material with an amine condensate. The sulfonate material includes one or more sulfonate salts, one or more sulfonate polymers, or a mixture thereof; and the amine condensate includes a reaction product of one or more organic acids with one or more organic compounds having at least two amine groups. The asphaltene inhibiting compositions can form stable injection solutions suitable for use in subsea umbilicals. Combinations of crude oil with the asphaltene inhibiting compositions undergo reduced, or inhibited, asphaltene deposition onto liquid-solid interfaces when compared to asphaltene deposition of the same crude oil in the absence of the composition. The asphaltene inhibiting compositions are particularly effective for inhibiting deposition of coke-like asphaltenes.

The invention relates to an asphaltene sediment dispersing agent based on dielectric constant measurement and a preparation method thereof. The dispersing agent is a mixed solution of toluene and ethanol, and the dielectric constant of the mixed solution is equal to or within 5% different from that of the asphaltene sediment. The preparation method comprises the following steps: firstly, measuring the dielectric constant of the asphaltene sediment, and then determining a mixed solution of toluene and ethanol which is equal to or similar to the dielectric constant of the asphaltene sediment as a dispersing agent; the objective of the invention is to find a proportional relation beneficial to asphaltene dissolution by mixing and compounding toluene and ethanol, measuring the dielectric constant of asphaltene sediment and calculating the dielectric constant of the mixed solvent, and the solvent is beneficial to asphaltene dissolution under the condition that the dielectric constants are similar through verification. The proper mixing ratio of the dissolved asphaltene sediment is guided through theoretical calculation.

The invention discloses a pore throat asphaltene deposition test system and a rock core asphaltene rapid evaluation method, and the test system mainly comprises a micro-nano simulation tube used for simulating a pore throat, an injection module used for injecting crude oil and CO2 into the micro-nano simulation tube, a purging module used for purging and returning the crude oil under the action of CO2 in the micro-nano simulation tube, and a sample loading module used for loading the crude oil into the micro-nano simulation tube, and the collecting module is used for collecting the backflow crude oil. By adopting the scheme, the asphaltene deposition condition of crude oil in the simulated size pore throat under the action of CO2 can be more accurately measured, the test result is more accurate, the operation is relatively more convenient, the consumption of asphaltene in an intermediate link is reduced, the calculation precision is favorably improved, the asphaltene deposition rule of an oil reservoir corresponding to a rock core is favorably and quickly determined, and the calculation efficiency is improved. And a more accurate theoretical basis is provided for CO2 injection development.

The subject invention provides compositions and methods for improving oil and / or gas production efficiency. In some embodiments, the compositions and methods utilize microbial surfactants, namely, glycolipids, to prevent the flocculation, precipitation and / or deposition of asphaltenes present in crude oil.

Methods of recovering a hydrocarbon from a subterranean reservoir include combining a solvent with 0.1 ppm to 10,000 ppm by weight of one or more sulfonate polymers to form a treatment composition; contacting the treatment composition with a crude oil disposed within the reservoir to form a treated crude oil; and collecting the treated crude oil from the reservoir. The sulfonate polymers are selected from poly(methylene naphthalene sulfonate) homopolymers and copolymers, branched or crosslinked polymers having pendant benzenesulfonate moieties, and any combination thereof. The treatment compositions are suitable for umbilical injection into a subsea reservoir. The treated crude oils obtain a 30% - 99% reduction in asphaltene fouling compared to an untreated crude oil obtained from the same reservoir.

Methods of recovering a hydrocarbon from a subterranean reservoir include combining a solvent with 0.1 ppm to 10,000 ppm by weight of one or more sulfonate polymers to form a treatment composition; contacting the treatment composition with a crude oil disposed within the reservoir to form a treated crude oil; and collecting the treated crude oil from the reservoir. The sulfonate polymers are selected from poly(methylene naphthalene sulfonate) homopolymers and copolymers, branched or crosslinked polymers having pendant benzenesulfonate moieties, and any combination thereof. The treatment compositions are suitable for umbilical injection into a subsea reservoir. The treated crude oils obtain a 30%-99% reduction in asphaltene fouling compared to an untreated crude oil obtained from the same reservoir.

The invention relates to an evaluation device and an evaluation experiment method for the inhibition effect of an asphaltene inhibitor, the device comprises a constant-temperature water bath, a deposition sheet and a differential pressure transducer, an asphaltene deposition pipeline is arranged in the constant-temperature water bath, and one end of the asphaltene deposition pipeline is connected with a liquid adding pump through a pipeline; the other end of the asphaltene deposition pipeline is connected with the liquid recoverer through a pipeline; a three-way valve is arranged on the pipeline between the liquid recoverer and the asphaltene deposition pipeline and is connected with a second nitrogen tank; the deposition sheet is arranged in the asphaltene deposition pipeline; the pressure difference sensors are arranged at the two ends of the asphaltene deposition pipeline respectively and used for measuring the pressure difference of the two ends of the asphaltene deposition pipeline. The device tests the effectiveness of the inhibitor in the actual operation environment by simulating different temperature, pressure and fluid conditions, can simulate the actual operation conditions, assesses the effect of the inhibitor in the aspect of reducing sediment generation, accurately assesses the performance of the inhibitor, and provides a scientific basis for the application of the inhibitor.

The invention provides a strong-permeability instant asphaltene dispersing and unblocking composition and application thereof. The dispersion blocking removal composition comprises a penetrating agent, a dispersing agent, a polymerization inhibition stabilizer and a solvent, wherein the polymerization inhibition stabilizer is a polymer containing an aromatic ring structure and an alkyl long side chain structure. The dispersing and unblocking composition has a good dispersing and dissolving effect on asphaltene deposition blocking, the preparation method of the dispersing and unblocking composition is simple, easy to operate, small in dosage, low in cost and harmless to downstream refining and chemical processes, does not affect subsequent crude oil dehydration and water treatment of a system, and is suitable for industrial production and field application.

The application provides a carbon dioxide drive asphaltene deposition numerical simulation method, device and storage medium. The method comprises the following steps: obtaining basic physical property data of a target asphalt sample, and dividing the target asphalt sample into a first pseudo-component that is soluble in low molecular saturated hydrocarbon and a second pseudo-component that is insoluble in low molecular saturated hydrocarbon; determining the physical property parameters of the first pseudo-component through an experiment, and inversely calculating the physical property parameters of the second pseudo-component by using a mixing law in combination with the basic physical properties of the sample; obtaining asphaltene deposition experimental data of the sample under different temperatures, pressures and CO2 concentrations, calculating the molar fraction of the second pseudo-component in a fluid phase after deposition, and determining a solid-liquid equilibrium K value as the ratio of the molar fraction of the second pseudo-component to the molar fraction of 1 in a solid phase; introducing the K value into a reservoir numerical simulator, establishing a multi-phase and multi-component model based on mass conservation and multi-phase percolation equations, coupling a porosity and permeability dynamic change model, and predicting asphaltene deposition behavior in a CO2 drive process and the influence of the asphaltene deposition behavior on reservoir physical properties.

Asphaltene inhibiting compositions include a mixture of a sulfonate material with an amine condensate. The sulfonate material includes one or more sulfonate salts, one or more sulfonate polymers, or a mixture thereof; and the amine condensate includes a reaction product of one or more organic acids with one or more organic compounds having at least two amine groups. The asphaltene inhibiting compositions can form stable injection solutions suitable for use in subsea umbilicals. Combinations of crude oil with the asphaltene inhibiting compositions undergo reduced, or inhibited, asphaltene deposition onto liquid-solid interfaces when compared to asphaltene deposition of the same crude oil in the absence of the composition. The asphaltene inhibiting compositions are particularly effective for inhibiting deposition of coke-like asphaltenes.

The present application relates to a kind of asphaltene inhibitor inhibitory effect evaluation device and evaluation experimental method, device includes thermostatic water bath, deposition sheet and differential pressure sensor, thermostatic water bath is provided with asphaltene deposition pipeline, one end of asphaltene deposition pipeline is connected with liquid feeding pump by pipeline;The other end of asphaltene deposition pipeline is connected with liquid recovery device by pipeline;Three-way valve is provided on the pipeline between liquid recovery device and asphaltene deposition pipeline, three-way valve is connected with second nitrogen tank;Deposition sheet is arranged in asphaltene deposition pipeline;Differential pressure sensor is arranged at the two ends of asphaltene deposition pipeline respectively, to measure the pressure difference of the two ends of asphaltene deposition pipeline.The device tests the effectiveness of inhibitor in actual operating environment by simulating different temperature, pressure and fluid conditions, the device can simulate actual operating conditions, assess the effect of inhibitor in reducing sediment generation, accurately assess the performance of inhibitor, provide scientific basis for its application.

The invention relates to an asphalt dispersing and wax removing agent for oil extraction. The problem that the actual effect is limited due to the fact that asphaltene and wax are singly dispersed or removed in an existing chemical removal method is mainly solved. The invention relates to an asphaltene cleaning agent which is characterized by comprising the following components in percentage by mass: 10%-20% of an asphaltene deposition inhibitor, 10%-20% of a surfactant, 1%-5% of a flash point improver and 55%-79% of an organic hydrocarbon solvent. The preparation method comprises the following steps: adding the asphaltene deposition inhibitor into the organic hydrocarbon solvent, stirring and dissolving, continuing to add the surfactant, stirring, adding the flash point improver, and stirring to enable the system to be dissolved and dispersed uniformly. The asphalt dispersing and wax removing agent for oil extraction can be used for dispersing and inhibiting precipitation of asphaltene in a crude oil extraction process, can also be used for preventing wax crystallization after light components continuously escape along with temperature and pressure reduction, and can be used for effectively removing precipitated wax, so that smooth oil flow in a well bottom stratum and a shaft is ensured, and energy loss is reduced.

The invention relates to the technical field of oil and gas field development, specifically a modified asphalt particle enhanced oil-based foam system and a preparation method and application thereof, wherein the asphalt enhanced oil-based foam system comprises a fluorinated acrylic copolymer, modified asphalt particles and a mixed oil solvent in a mass ratio range of (1-2):(0.2-1):100; the foaming ratio of the foam system is 325%-355%, and the defoaming half-life is 61min-90min. Fluorinated acrylic copolymer and modified asphalt particles are selected, and the synergistic adsorption of the two at the oil-gas interface is utilized to effectively control the interfacial tension, and at the same time, the prepared foam has good foaming property and stability, thereby effectively controlling gas cross-flow; the modified substance on the surface of the modified asphalt particles is diffused and transferred to the surface of the asphaltene precipitated from the stratum, realizing the in-situ modification of the stratum asphaltene, so that it is retained in the core and continues to play the role of stabilizing the foam, thereby reducing the asphaltene deposition amount in the final output oil.

The utility model relates to the technical field of chemical production, in particular to a boiling bed residual oil hydrocracking feeding system which comprises a vacuum residual oil feeding pipeline, a raw material buffer tank, a high aromatic oil storage tank, a mixing shear pump and a vacuum residual oil mixing pipeline, a discharge hole of the raw material buffer tank is connected with the raw material booster pump; the high aromatic oil storage tank is connected with the high aromatic oil steam heater; an inlet of the mixing shear pump is connected with the high aromatic oil steam heater through a high aromatic oil mixing pipeline, and an outlet of the mixing shear pump is connected to a feeding hole of the raw material buffer tank; the vacuum residual oil mixing pipeline is led out from a vacuum residual oil feeding pipeline to an inlet of the mixing shear pump, and a first valve is arranged on the vacuum residual oil mixing pipeline. Through the arrangement of the pipeline and the device, a certain proportion of high aromatic oil is introduced into the reduced slag raw material, asphaltene deposition of the device can be reduced, and the operation period of the device is prolonged.

The present application relates to a kind of asphalt dispersion wax removal agent for oil production.The main problem to be solved is that the existing chemical removal method is single dispersion or removal of asphaltene and wax, which limits the actual effect.The characteristics are as follows: the components and the ratio are as follows: asphaltene deposition inhibitor 10% to 20%, surfactant 10% to 20%, flash point enhancer 1% to 5%, and organic hydrocarbon solvent 55% to 79%.The preparation method is as follows: add asphaltene deposition inhibitor to organic hydrocarbon solvent, stir and dissolve, then add surfactant, stir, then add flash point enhancer, and stir to make the system dissolve and disperse uniformly.The asphalt dispersion wax removal agent for oil production can disperse and inhibit the precipitation of asphaltene during crude oil production, prevent the crystallization of wax as temperature and pressure decrease and light components continuously escape, effectively remove the wax, ensure the smooth flow of oil in the well bottom formation and wellbore, and reduce energy loss.