12 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.

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.

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.