363 results about "Imbibition" patented technology

An electric-cigarette undertaking nanometer dimension fineness space heating pulverization to nicotine solution comprises a cigarette pole and a cigarette holder connected with the front end of the cigarette pole. The cigarette pole is a hollow rod shape cigarette pole welded with a plug at the back end. The intracavity of the cigarette pole is provided with a rechargeable battery, a liquid storage tank for storing nicotine solution, an imbibition liquid core arranged at the front end of the liquid storage tank and contacted with the nicotine solution, and a heater of space heating pulverization arranged inside the heating cavity positioned in the front part of the cigarette pole. The wall of the cigarette pole corresponding to the liquid storage tank is provided with a liquid inlet communicated with the liquid storage tank. Any place of the wall of the cigarette pole is provided with an electric heating switch. The center of the cigarette holder is provided with a hollow pipe which extends into the cigarette pole. The wall of front part of the cigarette holder is provided with a piezoelectric press sensor. The back end of the cigarette pole is provided with a recharging connection device which can charge the rechargeable battery through outer power. The piezoelectric press sensor is communicated with the rechargeable battery all the time. The electric heating switch, the piezoelectric press sensor and the rechargeable battery constitute a circuit loop. The invention has the advantages of convenient assembly and installation, easy carry, wide application and convenient use.

The present Invention relates to hydrocarbon well stimulation, and more particularly to methods and compositions to remove (or more generally to transfer) fluid introduced into the subsurface. For instance, preferred methods involve creating then exploiting a capillary pressure gradient at the fracture face to induce fluid flow from the fracture into the formation thereby increasing effective fracture length, and then improving fracture conductivity.

A method is given for treating a wellbore to increase the production of hydrocarbons from a subterranean formation penetrated by a wellbore, involving a period of injecting into the formation an aqueous injection fluid having a different chemical potential than the aqueous fluid in the formation. If there is water blocking, an osmotic gradient is deliberately created to cause flow of water into the injected fluid; hydrocarbon is then produced by imbibition. If the pore pressure in the water-containing pores in the formation is too low, an osmotic gradient is deliberately created so that water flows from the injected fluid into the water-containing pores, increasing the pore pressure and facilitating hydrocarbon production by imbibition. The method may be repeated cyclically. A semipermeable membrane may be created to enhance the osmosis. Wetting agents may be used to influence imbibition.

An osmotic pump system includes a capsule having at least one delivery port, a membrane plug retained at an open end of the capsule remote from the delivery port, the membrane plug providing a fluid-permeable barrier between an interior and an exterior of the capsule, and a removable imbibition rate reducer attachable to the capsule. The imbibition rate reducer comprises one or more flow controllers selected from the group consisting of an orifice having a selected size smaller than a surface area of the membrane plug and a membrane having a selected thickness, surface area, radial compression, and permeability. The imbibition rate reducer allows customizable delivery of medicaments.

The invention discloses a spherical porous silicon / carbon composite material as well as a preparation method and application thereof. The spherical porous silicon / carbon composite material is structurally characterized in that a SiOx / C matrix, graphite with small particle size and a conductive agent are dispersed in porous amorphous carbon, wherein the average particle diameter is 12-25mu m; the method comprises the following steps of carrying out first coating on a SiOx raw material with powder pitch, and performing heat treatment so as to obtain a SiOx / C material; then performing ball milling by use of a wet method so as to reduce the particle diameter of powder, adding a carbon source adhesive, the graphite with the small particle diameter and the conductive agent, and performing high-speed dispersion, thereby obtaining pulp; and finally performing spray granulation and sintering on the pulp, thereby obtaining the final spherical porous silicon / carbon composite material. According to the invention, SiOx is dispersed in cracking carbon, the graphite and the conductive agent, so that SiOx volume expansion during a charge / discharge process is buffered, and the conductibility is enhanced; by virtue of the porous structure, the imbibition rate and cycle performance of the material can be effectively improved; by virtue of bitumencarb coating and high-heat treatment performed in advance, SiOx is prevented from being directly contacted with an electrolyte, and furthermore, the stability and first efficiency of the silicon / carbon material are improved.

The invention discloses an experimental test method for gas reservoir reverse imbibition water blocking damage evaluation under a high-temperature and high-pressure condition. The experimental test method is completed through a water blocking effect experimental measuring device. The experimental test method comprises the steps that firstly, a core is washed and dried to be placed into a core holding unit; secondly, the core is vacuumized, displacement pressure is increased to formation pressure Pf, and formation water is injected into the core under constant pressure; thirdly, the temperature is raised to the formation temperature T0; fourthly, nitrogen is injected into the core, displacement is carried out until the liquid level of a water measuring meter at the core outlet end does not change, and gas phase permeability K1 is calculated; fifthly, formation water is injected into the core until no gas is discharged out of the core outlet end; sixthly, secondary gas driving water is carried out on the core, displacement is carried out until the liquid level of the water measuring meter at the core outlet end does not change, and gas phase permeability K2 is calculated; seventhly, the damage degree of water blocking damage to the gas phase permeability is determined. The experimental test method conforms to the actual gas reservoir developing process, a reasonable testing method is provided for reservoir water blocking damage measuring evaluation, and the experimental test method has wide market prospects.

The invention relates to a preparation method of a porous sodium acrylate super absorbent resin. The preparation method comprises the following steps: an aqueous solution containing 30 to 45 wt% of acrylic acid monomers with a neutralization rate of 60 to 90 mole%, a cross linking agent, a porogenic agent, and a polymerization initiator are polymerized together under nitrogen protection; and porous particles are prepared through preparing granulums with diameters of 2 to 10 mm from hydrogel prepared through polymerization, and adding the surface cross linking agent and an inorganic filler to carry out surface processing. The preparation method of the invention allows continuous production to be realized, productivity to be improved, manpower to be decreased, a problem of slow imbibition to be solved, drying period to be substantially decreased, product performances to be substantially improved, the qualified rate of products to be high, reaction to be mild, and three wastes to be less.

The invention discloses a preparation method and product of germinated wheat rich in gamma-aminobutyric acid, and the method is used for solving the problems of bad existing effect and unstable yield since GABA is enriched by utilizing tea and rice products according to an existing method for preparing gamma-aminobutyric acid based on a biological concentration method. The method comprises the following steps of: raw material selection, pretreatment, imbibition, temperature control training and germination termination. Wheat seeds are dramatically taken as raw materials, the improvement of GAD enzyme activity in wheat seeds is effectively promoted by controlling germination conditions, a cultivated substrate and the pH value, and meanwhile the GAD activity is ensured by controlling the pH value, the activity of GABA aminopherase is inhibited, and the content of gamma-aminobutyric acid in germinated wheat is greatly improved, so that the nutritive value of wheat is greatly improved. Experimental results show that the content of GABA in the prepared germinated wheat is 31.08 mg per 100 g at most, and achieves domestic and international leading level of similar methods.

The invention discloses a method for modeling a predictable physical model for fractured anisotropic oil reservoir water flooding development, and the method comprises the following steps: (a) establishing similarity criteria for simulating the fractured oil reservoir development according to characteristics of the process of fractured oil reservoir water flooding oil development and by utilizing theories of seepage mechanics and similarity analysis, wherein the similarity criteria comprise similarities in shape and space, shaft geometry, physical properties of rock, oil-water viscosity, gravity-pressure, matrix and fracture movable oil amount ratio, oil content distribution in matrix, matrix imbibition and fracture displacement characteristic time, imbibition intensity distribution and time process; (b) realizing the similarity criteria and a design method of model parameters; and (c) modeling an oil reservoir macroscopic physical model which meets the multiple similarities so as to comprehensively simulate and predict seepage characteristics and the development process of real fractured oil reservoir. A predictable physical simulation similarity criterion system for the fractured anisotropic oil reservoir is established, has comprehensive functions and is easy to realize.

The present invention provides a method for preparing a carbon / carbon-silicon carbide material used by the skid of the magnetic suspending train, which comprises the following procedures in sequence: when the weftless fabric and the ply tire distance-alternating laminate are needled to the quasi-three dimensional carbon fiber whole felt with density 0.4-0.58g / cm<3>, executing a high-temperature treatment with temperature 1800 DEG C-2300 DEG C, executing pyrolytic carbon densification with an equal-temperature CVI or thermal gradient CVI method to prepare a porous C / C base substrate with density 1.4-1.5g / cm<3>, under the protective atmosphere executign 2000 DEG C-2300 DEG C high-temperature treatment to the base substrate, and executing non-immersing orienting fusing Si imbibition at 1500 DEG C to 1650 DEG C. The invention settles the problem that the C / C-SiC magnetic suspending skid prepared by the two-dimensional carbon cloth laminated layer is easily layered and beaked off and disabled, the production period is far lower than that in the method that the C / C magnetic suspending skid is prepared by CVI and impregnation charring, the production technique is simple and the production cost is low.

The invention relates to a fractured extra-low-permeability reservoir dynamic imbibition stimulation experiment device and application thereof. The device comprises a confining pressure pump, a constant flow pump and a constant temperature tank body, wherein an intermediate container, a core imbibition chamber, an oil-water metering module and a heating device are arranged in the constant temperature tank body; the oil-water metering module comprises a water quantity metering device and an oil quantity metering device which are communicated with each other through a fourth communication valve; an opening formed in the top end of the core imbibition chamber is communicated with the oil-water metering module, and an opening formed in the bottom end of the core imbibition chamber is communicated with the constant flow pump through the intermediate container. The device can measure the change relation of imbibition oil production of different-physical-property low permeability-extra-low permeability cores at a certain temperature and pressure along with time; furthermore, the effects of different parameters of fracture size, water drive speed and water drive period on the imbibition amount can be researched.

The process of the invention comprises 1) preparing a dry porous support incorporating one or more biomolecule-modifying reagents, 2) applying a biomolecule-containing sample solution to said support wherein the volume of said sample is equal to or less than the imbibition capacity of said support so that the sample is completely imbibed on said support, 3) allowing the product of step 2 sufficient time for said biomolecule-modifying reagent to interact with the biomolecule of interest in said sample, then 4) recovering biomolecules from said support and devices for use therewith

The invention discloses a manufacturing method of an ice bag for preserving biological products. The manufacturing method comprises the following steps: 1) adding a thickener into hot water or boiling water, and fully stirring till dissolution; 2) adding high molecular water-absorbing resin into a solution in the step 1) while hot, stirring, then standing to carry out full reaction and imbibition on the high molecular water-absorbing resin and the thickener, and forming a gelatinous solid, wherein the reaction time is 5-30minutes; and 3) bagging the gelatinous solid in the step 2), cooling, and then placing into a cold storage, a refrigerating cabinet or a refrigerator at the temperature of -10 DEG C to -20 DEG C for freezing for above 12hours. The invention provides a simple, convenient and high-efficient manufacturing method of a high molecular cold storage agent, namely the manufacturing method of the ice bag for preserving the biological products. The prepared cold storage agent has the advantages of high repeatability, great freezing-thawing phase change latent heat, long cold storage time and fast water absorption speed, and furthermore, the cost of the process is low; and by changing the added thickener, the different phase change temperatures can be obtained for meeting various different application requirements.

The invention provides a method for improving recovery efficiency through huff and puffoil recovery of a tight oil fractured horizontal well. When reservoir pressure is reduced to a certain optimized pressure, the horizontal well is subjected to sand washing out and well flushing, water is injected into the reservoir at the specified daily water-injection rate, water injection is stopped when pressure at the end of injection life is maintained to be 100%, and then the accumulated water-injection rate is equal to accumulated fluid withdrawal rate in the previous production stage of the well; after water injection is ended, the horizontal well is closed and enters a closing-in stage to depend on imbibition replacement and other effects, so that crude reservoir oil enters a high-permeability channel; and during oil extraction, when formation pressure in the control area of the horizontal well is reduced to rated pressure, the well is closed, and second round of huff and puff oil recovery is performed. According to the method for improving recovery efficiency through the huff and puffoil recovery of the tight oil fractured horizontal well disclosed by the invention, crude oil in dense reservoir rock matrix pores developed in natural fracture is further extracted, the single well yield of an oil well is improved by comprehensively utilizing formation energy rising, injected water and crude reservoir oil imbibition replacement and other principles, and a new approach is developed for increasing the crude oil recovery rate of the dense oil reservoir.

This invention discloses a polymer formwork method preparing F polymer lithium battery membrane. This invention adopts the low molecular weight as the polymer formwork, metafluoroethylene or its copolymer as the matrix of F polymer, make the thickness solution with different mixture ratio in different solutions under the temperature of 50deg.C--80deg.C; the molding fluid carries out sweep molding on the smooth glass plate, adopt solvent evaporation conversion process to make the polymer film; use extractant to extract polymer formwork under room temperature, then natural dry; activate in the electrolytic solution and get polymer electrolytic film. Using different preparation and extracting conditions to get different apertures and microporous membranes with different structures. This microporou membranes gained by this invention has the regular microporous structure, the porosity ratio is 50-70%, the average aperture is 0.5-3 mum, the imbibitions ration is 250-520%,and the conducting ratio is 10 to the power -3-10 to the power -2 S cm to the power -1 and can be used as the membrane of the secondary battery. This membrane can also be used as compart or supporting membrane.

The invention discloses an ultrasonic atomization structure and an ultrasonic atomization device using the same. The ultrasonic atomization structure comprises a liquid receiving tank 12, a liquid absorption medium 15 and an atomization unit, wherein the liquid absorption medium 15 is arranged in the liquid receiving tank 12, and the bottom surface of the liquid absorption medium 15 is immersed in liquid in the liquid receiving tank 12. When the ultrasonic atomization structure is used, the liquid absorption medium 15 absorbs the liquid in the liquid receiving tank 12 and conveys the liquid to one end of the liquid imbibition medium 15, far from the bottom surface of the liquid absorption medium 15, the atomization unit is attached to the end of the liquid absorption medium 15, far from the bottom surface of the liquid absorption medium 15, and the end of the liquid absorption medium 15, far from the bottom surface of the liquid absorption medium 15, is provided with a groove 1501. The ultrasonic atomization structure and the ultrasonic atomization device using the same can atomize the high viscosity liquid into fine drops, and can not cause a superheating phenomenon to the atomization unit.

A method of servicing a wellbore comprising preparing a composition comprising a non-aqueous carrier fluid, an oil-wetting surfactant, a water-imbibition enhancing surfactant, and a cementitious material; placing the composition within a detrimentally permeable zone; and contacting the composition with water. A method of servicing a wellbore comprising placing a composition comprising a non-aqueous carrier fluid, an oil-wetting surfactant, a water-imbibition enhancing surfactant, and a cementitious material into the wellbore wherein the wellbore comprises hydrocarbon-producing zones and water-producing zones and wherein the composition enters the water-producing zone and forms a solid mass that obstructs the flow of water in the water-producing zone. A method of servicing wellbore comprising placing a composition comprising a non-aqueous carrier fluid, an oil-wetting surfactant, a water-imbibition enhancing surfactant, and a cementitious material into a lost circulation zone within the wellbore; and contacting the composition in situ with a water source.

The invention provides a spontaneous imbibition measurement apparatus and an experiment method thereof. The spontaneous imbibition measurement apparatus comprises: a box body having a measurement chamber and a sample chamber, wherein the measurement chamber is positioned above the sample chamber; a container positioned in the sample chamber, wherein a liquid to be measured and a rock sample to be measured are contained in the container, and the rock sample to be measured intrudes into the liquid to be measured, is clamped by a rock sample clamper, and is connected with a resistivity measuring instrument; a weighing mechanism positioned in the measurement chamber and connected with the rock sample clamper through a suspension rope; and a conductivity measurement mechanism positioned in the measurement chamber and connected with a conductivity electrode stretching into the liquid to be measured. The spontaneous imbibition measurement apparatus and the experiment method thereof allow the spontaneous imbibitions capability of unconventional reservoir rocks in different stratums or in different positions of a same stratum to be rapidly and accurately evaluated, and provide base data for researches of recycling of fracturing fluids.

The invention discloses a polyvinyl formal sponge material with uniform abscesses and rapid imbibition and a preparation method thereof. The material comprises polyvinyl alcohol, a cross-linking agent, a catalyst and a pore-forming agent, wherein the cross-linking agent is formaldehyde or paraformaldehyde or formaldehyde solution. The preparation method comprises the following steps of: stirring 2-9 parts of polyvinyl alcohol in 100-200 parts of water of which the temperature is 60-98 DEG C to obtain solution, and adding 0.05-8 parts of pore-forming agent to the solution; fully emulsifying the pore-forming agent to form evenly dispersed continuous solution phase; then adding 1-26 parts of catalyst and 1-15 parts of cross-linking agent or 5-50 parts of recovered liquid waste, 1-8 parts of catalyst and 1-15 parts of cross-linking agent, and mixing; pouring the mixture into a mould after 1-60 min for cross-linking reaction for 0.1-2 hours to form the abscesses under the action of the pore-forming agent; and continuing to heat and cure for 2-18 hours to prepare the polyvinyl formal sponge material. The invention has the advantages of good hydrophily, high compression strength, high dry wetting rate, high imbibition ratio and the like.

The invention discloses an experimental test device and method for forced imbibition capability of shale. The test device mainly comprises a clamp holder, a press machine, a calorstat, a constant-speed constant-pressure pump, an intermediate container, a constant-speed constant-pressure pump outlet valve, a tee, an inlet valve for a fluid in the parallel bedding direction and an inlet valve for afluid in the vertical bedding direction. The test method comprises the steps of 1) rock sample processing, 2) porosity testing, 3) test parameter determining, 4) fracturing fluid preparing, 5) experimental testing and 6) imbibition capacity calculating. The test device and the test method which are disclosed by the invention have the advantages that various influencing factors such as formation stress, formation temperature, fluid injection pressure, shale anisotropy and the like can be considered in the test method to ensure that the forced imbibition capability in the different bedding directions, of the shale, can be quantitatively characterized; the change rule of the forced imbibition amount of the shale under different formation conditions with time can be accurately reflected and quantitatively tested; and very good guiding roles are played for knowing the imbibition rule of the shale and optimizing the shale volume flowback system after fracturing.

The invention discloses a preparation method of crylic acid resin with high water absorbability. The preparation method comprises the following steps: adding variant valence metal low valence ion with molar weight of 2-100 ppm relative to an acrylic monomer into initiator in an acrylic acid polymerization process, and taking the variant valence metal low valence ion as assistant reducing agent, so that the content of low polymer in the product can be effectively reduced; and spraying emulsion formed by reducing agent aqueous solution, hydrophobic solvent and surface active agent in a granulation process of prepared resin colloid with water absorbability, and taking the emulsion as dispersing agent, so that the functions of dispersing colloidal particles, increasing whiteness and reducing residual monomers are realized. The method is easy to realize, the imbibition capacity of the resin with water absorbability can be effectively improved, and the color of the resin with water absorbability is improved.

The invention discloses an electrolyte containing an inorganic additive and a lithium-ion battery containing the electrolyte. The electrolyte comprises an organic solvent, a lithium salt electrolyte, the inorganic additive and an organic additive; the inorganic additive is one or a mixture of two or more of dry aluminum oxide, dry silicon oxide, dry magnesium oxide, dry zinc oxide and dry titanium dioxide and has the particle size less than 100 nm. The electrolyte provided by the invention can reduce the surface activity of a cathode material, thereby suppressing side reaction between an electrode material and the electrolyte, increasing a battery charging voltage and improving the cycle comprehensive performance of the electrolyte, can improve wettability and good imbibition of the electrolyte for a diaphragm and suppress a micro-short circuit, can efficiently improve the electrochemical performance of a lithium battery for neutralizing free harmful gases such as hydrogen fluoride and fluorine gas, and can reduce water content in the electrolyte.

The invention discloses a novel sponge body double-waste pervious concrete pavement. The pavement comprises the following layers in order: a surface layer, a connecting layer, a base and a cushion. The connecting layer is sponge body garden waste mortar; the base is novel sponge body double-waste pervious concrete; the sponge body garden waste mortar comprises cement, sand and garden waste; the novel sponge body double-waste pervious concrete comprises cement, sand, garden waste, regenerated stones and a brightener. The sponge body double-waste pervious concrete pavement solves the city garden waste pollution problem, changes waste into valuables, and is good for environmental protection; the pavement has the advantages of water imbibition, water penetration, water storage, permeability and higher strength; the garden waste can be collected conveniently, and concrete, mortar and other materials are saved, so that the pavement is economical.

The invention provides an experiment device capable of simulating reservoir rock imbibitions under a formation condition and a method. The experiment device comprises an oven, wherein a drying chamberand a measuring chamber are arranged inside the oven; a high-pressure rock core clamp is arranged in the measuring chamber; one end of the high-pressure rock core clamp is connected with a trough pipeline; a water pump and a first pressure gauge are sequentially arranged between the water trough and the high-pressure rock core clamp; the other end of the high-pressure rock core clamp is connectedwith a mercury pipeline; a high-precision pressure gauge of which the precision is 0.1% is arranged between the high-pressure rock core clamp and the mercury pipeline; a confining pressure injectionhole is formed in the side wall of the high-pressure rock core clamp; the confining pressure injection hole is connected with a confining pressure injection pipeline; a second pressure gauge is arranged between the confining pressure injection hole and the confining pressure injection pump. By adopting the experiment device, controllable simulation of a rock core temperature environment, a confining pressure environment and a pressurized fluid environment in a gap under the formation condition is achieved, and measurement results of rock core water absorption quantities are approximate to actual situations.

A method is described for selecting an additive for enhanced recovery from a subterranean hydrocarbon reservoir including the steps of using parameters characterizing rock type and surfaces in the reservoir, pore geometry and / or distribution, hydrocarbons and / or other constituent elements identified as being present in the reservoir, using parameters characterizing an injection fluid or fluid mixture to be injected into the reservoir, using parameters characterizing the additive to be added to the injection fluid and its concentration; using the parameters to determine at a first level of molecular dynamic modeling the effect of the additive on the interfacial tension between hydrocarbon and water / brine or an equivalent parameter, using the parameters and results derived from the first level of molecular dynamic modeling to determine at a second coarser level of molecular dynamic modeling wettability effects or an equivalent parameter and using the parameters and results derived from first and second level of molecular dynamic modeling to determine at a third coarser level of molecular dynamic modeling imbibition or drainage effects.

The invention provides a slick-water fracturing fluid with high imbibition efficiency. The slick-water fracturing fluid comprises the following components in percentages by weight: 0.08 to 0.1% of a slick-water drag-reducing agent, 0.3 to 0.5% of a surfactant, 0.1 to 0.3% of hydrophilic nanoparticles and 0.3 to 0.5% of a clay stabilizer, with the balance being water. According to the invention, the surfactant and the hydrophilic nanoparticles are utilized to change wetting performance of a reservoir, so the slick-water fracturing fluid entering a well can enter fine pore channels of matrix rock through spontaneous imbibition after breaking of a gel under the driving of capillary force; and crude oil is gradually collected into large pore channels and main fractured fractures through oil-water displacement, so the dual purposes of supplementing stratum energy and improving the yield of an oil well are realized. The slick-water fracturing fluid provided by the invention can increase theimbibition efficiency of a gel breaking fluid of the slick-water fracturing fluid, thereby finally improving recovery efficiency.

The invention relates to a synthetic method for a high-speed instant-absorption type super absorbent resin. The synthetic method comprises the following steps: 1) adding a copolymerization water-soluble monomer, a cross-linking agent and an initiator into a mixed aqueous solution of acrylic acid and sodium hydroxide, placing an obtained mixture in a glass container and carrying out stirring so as to prepare a water phase solution; 2) with a dispersant as a continuous phase of inverse emulsion polymerization, adding the dispersant into a reaction flask and then adding an emulsifier and a copolymerization hydrophobic monomer to prepare an oil phase solution; and 3) adding the water phase solution into the oil phase solution drop by drop, carrying out mixing and high speed stirring for emulsification, allowing a temperature to gradually rise after uniform stirring of a system, wherein time for a later-period polymerization reaction is 2.5 to 3.5 h, cooling to room temperature after completion of the reaction and successively carrying out filtering, washing and vacuum drying so as to obtain the white powdery water-absorption resin. The invention has the following beneficial effects: since synthesis conditions are simple, the imbibition rate of the resin can be improved while high water absorbency is maintained.

The invention discloses an asphalt-based nanoporous carbon material, a negative material thereof, and a lithium ion battery. The asphalt-based nanoporous carbon material is prepared by mainly using 0.1-10g of asphalt, 3-50g of anhydrous aluminum trichloride, 100-400ml of anhydrous carbon tetrachloride and 200-500ml of a reaction terminating agent, and the amounts of the above raw materials can be freely adjusted in proportion. The asphalt-based nanoporous carbon material is prepared by mainly using asphalt, anhydrous aluminum chloride, anhydrous carbon tetrachloride and the reaction termination agent, and asphalt and anhydrous carbon tetrachloride undergo a Friedel-Crafts crosslinking reaction through a nanometer pore forming technology, so the obtained asphalt-based carbon material has a porous structure and a high specific surface area, and the negative material prepared by using the asphalt-based nanoporous carbon material has the characteristics of strong electrolyte imbibition and retention ability, good processing performance, low price and the like, and can greatly improve the cycle performances of the lithium ion battery.

The invention discloses a spontaneous imbibition measurement method based on electric potential. The spontaneous imbibition measurement method comprises the following steps: drying a rock core to a state without free water and putting the rock core into a rubber cylinder; applying confining pressure on the rubber cylinder; switching on a constant-voltage power supply and recording an electric potential difference between adjacent measurement probes; adjusting a hand pump to enable a water surface in a water storage space to be right in contact with the bottom end of the rock core and recording the change of the electric potential of each measurement probe along with time; unloading the confining pressure of the rock core and putting the rock core into a water pool until the rock core reaches a saturated state, and then putting into the rubber cylinder and applying the confining pressure on the rock core; switching on the constant-voltage power supply and recording an electric potential difference between the adjacent measurement probes; analyzing data; and evaluating a spontaneous imbibition rule of the rock core. According to the measurement method, the electric potential difference is applied to the rock core through a spontaneous imbibition measurement device based on the electric potential and the electric potential of each point on the surface of the rock core is measured; and the spontaneous imbibition interface height of the rock core to each type of liquid including fracturing fluid and the like is monitored and the change of liquid saturation degree on the rock core along the time is monitored, so that parameters including water absorption speed, capillary force, water absorption quality and the like of a tested sample can be grasped in real time.

The invention relates to a nano magnetofluid fracturing fluid imbibition oil-increasing method for a tight reservoir and modified nano magnetic particles. The nano magnetofluid fracturing fluid imbibition oil-increasing method comprises the steps that magnetic fracturing prepad fluid is pumped into a formation, a crack is formed in the formation, a magnetic field is applied to the well bottom, andthe modified nano magnetic particles in the magnetic fracturing prepad fluid are delivered to a target oil reservoir; a fracturing fluid base fluid and a propping agent for fracturing are mixed to form sand-carrying fluid to be pumped into the crack formed in the formation, so as to support the geometrical shape of the crack; and after fracturing construction, the magnetic field is applied to thewell bottom, thus the nano magnetic particles adsorbing crude oil flow back into a wellbore and then recovered out of the ground, and the magnetic particles are recovered through the magnetic force effect. The nano magnetofluid fracturing fluid imbibition oil-increasing method for the tight reservoir and the modified nano magnetic particles are suitable for an oilfield with the high water content, the modified nano magnetic particles have high lipophilicity and hydrophobicity, thus the magnetic particles adsorb the crude oil in the target oil reservoir and flow back to the wellbore through the pressure difference at the well bottom and the effect of the externally applied magnetic field, the crude oil output can be well increased, water production is reduced, the magnetic nanoparticles are recovered out of the ground in the oil recovery process, and the magnetic particles can be recovered through magnetic force to be reused, so that the production cost is reduced.