35 results about "Plastic viscosity" patented technology

The invention discloses a graft polymer and a preparation method and application thereof.The graft polymer comprises a structural unit I from graphene oxide, a structural unit II from a monomer A and a structural unit III from a monomer B. The value of the carbon element and the oxygen element of the graphene oxide is not larger than 2.5; the monomer A is a monomer containing a sulfonic acid group; the monomer B is a propenyl monomer containing a rigid group; the viscosity average molecular weight of the graft polymer is 75,000 to 120,000. The graft polymer disclosed by the invention can be used as an ultrahigh-temperature salt-resistant shear strength improving agent for water-based drilling fluid, the temperature resistance can reach 240 DEG C or above, the salt resistance can reach saturation, and the influence on the plastic viscosity of the drilling fluid is less while the shearing force of the drilling fluid is increased.

Drilling fluid compositions may include a weighting agent, a nitrite-containing compound, and an ammonium-containing compound, where the nitrite-containing compound and the ammonium-containing compound may be encapsulated together in copolymer micro-particles forming encapsulated thermochemical compounds, and where at least one property selected from the group consisting of the density, the plastic viscosity, the yield point, the gel strength, and the pH, of the drilling fluid composition may be substantially similar to the at least one property of a comparable drilling fluid composition devoid of the encapsulated thermochemical compounds. Methods for reducing a filter cake from a wellbore surface in a subterranean formation are also provided. The methods may include introducing into the wellbore the drilling fluid compositions, allowing the drilling fluid composition to reach a temperature in the wellbore sufficient for the encapsulated thermochemical compounds to react, where the reaction of the encapsulated thermochemical compounds generates heat and nitrogen gas.

The invention discloses a multi-element solid-waste-based ecological mining area filling material and a preparation method thereof.The preparation method of the multi-element solid-waste-based ecological mining area filling material comprises the steps that a first system and a second system are mixed to be uniform, slurry is obtained, pouring and standing are conducted till final setting, maintenance is conducted, and the multi-element solid-waste-based ecological mining area filling material is obtained; the first system comprises a foaming agent and first water; the second system comprises a cementing material, second water and a water reducing agent. The multi-element solid waste-based ecological mining area filling material provided by the invention takes the fly ash as a main raw material and is low in cost, the slump expansion degree of the multi-element solid waste-based ecological mining area filling material is up to 272 mm, the uniaxial compressive strength is up to 5.928 MPa, and meanwhile, the multi-element solid waste-based ecological mining area filling material has relatively low plastic viscosity and yield stress.

Drilling fluid compositions may include a weighting agent, a nitrite-containing compound, and an ammonium-containing compound, where the nitrite-containing compound and the ammonium-containing compound may be encapsulated together in copolymer micro-particles forming encapsulated thermochemical compounds, and where at least one property selected from the group consisting of the density, the plastic viscosity, the yield point, the gel strength, and the pH, of the drilling fluid composition may be substantially similar to the at least one property of a comparable drilling fluid composition devoid of the encapsulated thermochemical compounds. Methods for reducing a filter cake from a wellbore surface in a subterranean formation are also provided. The methods may include introducing into the wellbore the drilling fluid compositions, allowing the drilling fluid composition to reach a temperature in the wellbore sufficient for the encapsulated thermochemical compounds to react, where the reaction of the encapsulated thermochemical compounds generates heat and nitrogen gas.

The invention relates to a water activity regulator as well as a preparation method and application thereof. The preparation method of the water activity regulator comprises the following steps: (1) mixing 2-acrylamide-2-methylpropanesulfonic acid, sodium p-styrenesulfonate, N-vinylpyrrolidone and polyether amine, and adding an initiator for polymerization reaction to obtain a polyether amine-sulfonic acid group-benzene ring copolymer; and (2) mixing the polyether amine-sulfonic acid group-benzene ring copolymer with a hydroxyl compound to obtain the water activity regulator. By adding the water activity regulator disclosed by the invention, the retention rate of apparent viscosity and plastic viscosity of the prepared sample adding slurry after aging is high, and the API filter loss is low.

This invention discloses a computer vision-based method and system for detecting the workability of concrete. It employs a non-contact visual sensing approach to simultaneously acquire video sequences of freshly mixed concrete in a free-flowing state at both the macroscopic slump flow scale and the microscopic particle migration scale. An improved spatiotemporal feature pyramid network is used to extract multi-scale morphological features from the video sequences, obtaining a multi-scale visual feature set including the flow profile evolution rate, surface ripple spectrum, aggregate suspension trajectory, and paste coating state. A graph neural network model integrating prior knowledge of fluid mechanics is constructed to map discrete visual features to continuous rheological parameters, outputting workability indicators such as slump, spread, yield stress, and plastic viscosity in real time. This invention significantly improves the level of intelligent quality control in concrete production.

The invention discloses a preparation method of C2-grade ceramic tile adhesive mortar capable of improving hanging resistance and construction hand feeling, and relates to the field of building material chemistry and composite materials. The preparation method of the C2-grade ceramic tile adhesive mortar for improving the sagging resistance and the construction hand feeling comprises a dry mixing pre-dispersion stage, a staged wet mixing and homogenizing stage, a standing curing stage and a final activation stage. According to the preparation method of the C2-grade ceramic tile adhesive mortar capable of improving the sagging resistance and the construction hand feeling, through the core effect of a wood fiber composite system, the traditional problem that high sagging resistance must be accompanied by high construction resistance is solved, the sagging resistance is maintained and even enhanced, meanwhile, the yield stress and the plastic viscosity of freshly mixed mortar are remarkably reduced, and the quality of the ceramic tile adhesive mortar is improved. The construction blade coating is smooth and labor-saving, the slurry is easy to spread, the surface is flat and full, and the construction efficiency, quality and operation experience are greatly improved.

The invention discloses a corrosion test method for a seabed cement-based material. The corrosion test method comprises the following steps: step 1, preparing artificial seabed sludge; 2, testing the water content and the shear strength of the artificial seabed sludge; 3, drawing a shear stress-shear rate curve of the artificial seabed sludge, and determining the yield stress and the plastic viscosity of the artificial seabed sludge; step 4, completely burying cement-based materials with different proportions into artificial seabed sludge, covering a sealing device, putting the artificial seabed sludge into a constant temperature and humidity chamber or an environmental test chamber, setting temperature and humidity parameters, and starting a soaking test; and 5, taking out the cement-based material according to a preset time interval, observing and testing to obtain an erosion rule of the cement-based material in an artificially prepared seabed sludge environment, and determining a construction mix proportion. The concentration of key erosion factors is accurately controlled by adjusting components according to needs, and erosion characteristics of specific marine environments such as mud flat, deep sea and salt marsh can be simulated.

The application discloses a kind of high density low rebound shotcrete and preparation method thereof, it is related to shotcrete field, and preparation method includes: (1), respectively to cementitious material, fine aggregate, coarse aggregate is using MAA model to be packed and the design ratio of each raw material in interior is obtained;(2), cementitious material, fine aggregate, coarse aggregate and the rebounding agent of design ratio obtained according to step (1) are fully mixed, water, water reducing agent is mixed, then by the way of mixing with pressurized air, incorporate accelerator, obtain high density low rebound shotcrete.The application uses early strength rebounding agent, improves the pumpability of shotcrete, accelerates the early hydration of concrete, under the joint action of alkali-free accelerator, rapidly improves the early mechanical properties of shotcrete, improves shotcrete construction efficiency.Multiple close packing is used, and cementitious material, fine aggregate, coarse aggregate respectively form close packing structure, effectively improve the plastic viscosity of paste and the compactness of concrete.

The present application relates to the field of environmental protection and ecological restoration, in particular to a method and system for determining the cylindrical penetration radius of a Bingham cement slurry diffusion path, comprising the following steps: obtaining the density, mass water content, specific gravity, permeability coefficient and average particle size of the rock-soil body through a rock-soil body mechanics experiment, and obtaining the porosity of the rock-soil body; obtaining the length ratio of the pore channels in the rock-soil body based on the porosity of the rock-soil body and the above-mentioned parameter information; obtaining the water viscosity, Bingham fluid plastic viscosity and Bingham fluid yield stress based on a rheological test scheme, and obtaining the water-cement ratio of the Bingham cement slurry, the grouting time, the grouting pressure, the grouting pipe radius and the groundwater pressure at the grouting point according to the grouting requirements; and obtaining the cylindrical penetration radius result under the Bingham cement slurry diffusion path based on the comprehensive action information of the particle size distribution, the diffusion path influence and the parameter information. The present application can calculate and predict the cylindrical penetration radius, reduce the risk of grouting engineering and ensure the safety and stability of the engineering.

A method may include: receiving wellbore data comprising wellbore geometry, density and rheology of a drilling fluid, and density and rheology of a cement slurry, and receiving a design objective function; generating a plurality of spacer fluid train designs where each of the plurality of spacer fluid train designs comprise two or more spacer fluids where each spacer fluid has a specified density, yield point, plastic viscosity, and volume; calculating a solution to an objective function and annular displacement for each of the plurality of spacer fluid train designs in a reverse cementing operation using a displacement simulator having inputs comprising the wellbore data and the plurality of spacer fluid train designs; comparing each solution to the objective function to the design objective function; selecting a spacer fluid train design from the plurality of spacer fluid train designs which meets the design objective function; and preparing a spacer fluid train based on the selected spacer fluid train design.

The present application relates to the technical field of high-performance cement-based material preparation and process control, and particularly relates to a self-compacting ultra-high performance concrete performance optimization method based on rheological parameter regulation. The steps are as follows: steel fibers are added to self-compacting ultra-high performance concrete slurry with rheological parameters in a set range to prepare test pieces, X-ray CT technology is used to perform three-dimensional reconstruction on the test pieces after curing, steel fiber distribution parameters are extracted, and crack propagation morphology and strain field distribution data are collected; an interface homogeneity index related to the steel fiber distribution parameters, crack propagation morphology and strain field distribution data is constructed, and X-ray CT technology is used to perform interface densification analysis; a function mapping relationship between the rheological parameters and the interface microstructure is constructed to determine the value range of the optimal yield stress and plastic viscosity. The above method is used to realize performance optimization in the self-compacting ultra-high performance concrete preparation stage.

The application discloses a high-strength-concrete viscosity-reducing fast-dispersing polycarboxylic acid water reducing agent and a preparation method thereof, and relates to the technical field of polycarboxylic acid water reducing agents; the high-strength-concrete viscosity-reducing fast-dispersing polycarboxylic acid water reducing agent comprises the following components in parts by weight: 400 parts of unsaturated polyether macromonomer, 20-40 parts of unsaturated acid monomer and 10-20 parts of unsaturated functional monomer; and the application further provides a preparation method of the polycarboxylic acid water reducing agent. The water reducing agent can reduce the viscosity of high-strength concrete, improve the dispersing performance of the concrete, reduce the mixing time, and thus solve the problems of high plastic viscosity of the concrete and the like without reducing the strength and other performances of the concrete.

The present application relates to a kind of low-pressure easy leakage formation drilling parameter optimization method, first, formation leakage pressure and collapse pressure are predicted;Then design drilling fluid performance parameters, wherein the density of drilling fluid is designed based on the equivalent density of smaller one in it;Circulation discharge and drilling fluid dynamic shear force, plastic viscosity are designed with the circulating resistance during drilling not more than the difference between leakage pressure and collapse pressure;Then calculate the critical annulus return speed when no cuttings bed is formed, if the current designed circulation return speed is less than the critical annulus return speed, then re-optimize circulation discharge and drilling fluid dynamic shear force, plastic viscosity, until the optimized circulation discharge meets the circulation return speed less than the critical annulus return speed;Complete the design of drilling fluid performance parameters for the whole well section;Finally, according to the drilling fluid performance parameters, optimize the drilling or casing speed, control the excitation pressure in the range of the difference between leakage pressure and collapse pressure, complete the drilling parameter optimization. Improve the drilling efficiency, reduce the cost.

This invention relates to the field of tunnel engineering materials technology, and in particular to a method for regulating the rheological properties of shield tunneling fine sand mortar using functional polycarboxylate superplasticizers. The method includes: providing cement, shield tunneling fine sand, natural sand, water, and functional polycarboxylate superplasticizers; the functional polycarboxylate superplasticizers include anti-mud adsorption type polycarboxylate superplasticizers and ultra-dispersed viscosity-reducing type polycarboxylate superplasticizers; setting the target flowability and target plastic viscosity of the cement mortar; based on a preset water-reducing equivalent complementary relationship model and a plastic viscosity regulation relationship model, using the set target flowability to match the water-reducing equivalent complementary relationship as a constraint condition, simultaneously solving to determine the dosage of PCE-SP and PCE-VR; by establishing a quantitative correlation between the fine aggregate coupling parameter D / PFT and the mortar yield stress and residual viscosity, the rheological properties of the mortar can be accurately predicted and targeted, significantly simplifying the mortar mix design process and reducing R&D and engineering application costs.

The invention relates to the technical field of workover fluids, in particular to a high-temperature-resistant workover fluid and a preparation method thereof. The high-temperature-resistant workover fluid comprises the following raw materials: deionized water, a modified anti-sedimentation enhancer, a temperature-resistant polymer thickener, a heat stabilizer, a viscosity stabilizer, a bactericide, a density regulator and a blocking agent. The preparation method of the high-temperature-resistant workover fluid comprises the following steps: sequentially adding the density regulator and the blocking agent into the deionized water, uniformly stirring, adding the modified anti-settling enhancer and the temperature-resistant polymer thickener, uniformly stirring, adding the heat stabilizer and the viscosity stabilizer, stirring at a constant temperature, cooling to room temperature, adding the bactericide, uniformly stirring, standing and curing, and thus obtaining the high-temperature-resistant workover fluid. The high-temperature-resistant workover fluid is obtained. The high-temperature-resistant workover fluid is outstanding in high-temperature stability, after the workover fluid is subjected to thermal standing at 210 DEG C for 7 days, the density is stable, parameters of plastic viscosity, dynamic shearing force and initial cutting / final cutting are reasonable, obvious sedimentation is avoided, and the stability of the workover fluid at high temperature is effectively improved.

The application relates to a cement slurry fluidity and rheological parameter measuring method and device under real temperature influence, and relates to the technical field of geotechnical engineering grouting material performance detection, which comprises the following steps: placing a container containing the cement slurry to be measured in the center of a horizontal constant temperature surface of a testing device, preheating and constant-temperatureing the horizontal constant temperature surface and the cement slurry to be measured to a preset test temperature, allowing the cement slurry to be measured to freely diffuse on the horizontal constant temperature surface of the testing device, automatically and accurately measuring the diffusion distances of the cement slurry in two mutually perpendicular directions, determining the average fluidity of the cement slurry at the preset test temperature according to the diffusion distances, and automatically calculating the plastic viscosity and yield stress of the cement slurry under the test temperature condition by using a rheological parameter prediction mathematical model built according to a solid-liquid two-phase flow theory and built in the device, so that the rheological parameters of the cement slurry under the real ambient temperature and real stratum temperature conditions of the engineering site can be quickly and reliably obtained.

The application discloses a superfine powder-micromolecule alcohol dual-phase synergistic UHPC viscosity reducer and a preparation method thereof, and belongs to the technical field of admixtures for building materials. The superfine powder is used to prepare the viscosity reducing admixture, dense packing is realized through multi-scale particle filling, the friction between particles is reduced, a graded continuous particle system is formed, the demand for free water is reduced, and the slurry fluidity is significantly improved. Meanwhile, through the dispersion of the polycarboxylic acid high-performance water reducing agent, the lubrication and hydration regulation of the micromolecule alcohol, the synergistic optimization of the air entraining agent and the defoaming agent on the bubble system, and the retardation of the setting retarder on the hydration process, a multi-scale synergistic viscosity reduction mechanism is formed, the slurry yield stress and plastic viscosity are significantly reduced, high strength and durability are maintained, and the application is suitable for the efficient viscosity reduction and working performance optimization of the low water-binder ratio UHPC system.

A method may include: receiving wellbore data comprising wellbore geometry, density and rheology of a drilling fluid, and density and rheology of a cement slurry, and receiving a design objective function; generating a plurality of spacer fluid train designs where each of the plurality of spacer fluid train designs comprise two or more spacer fluids where each spacer fluid has a specified density, yield point, plastic viscosity, and volume; calculating a solution to an objective function and annular displacement for each of the plurality of spacer fluid train designs in a reverse cementing operation using a displacement simulator having inputs comprising the wellbore data and the plurality of spacer fluid train designs; comparing each solution to the objective function to the design objective function; selecting a spacer fluid train design from the plurality of spacer fluid train designs which meets the design objective function; and preparing a spacer fluid train based on the selected spacer fluid train design.

The invention discloses a construction method of a paste rheological property prediction model of an integrated algorithm, and belongs to the technical field of metal mine paste filling. The method comprises the following steps: preparing paste filling slurries with different mass concentrations and cement-sand ratios by utilizing tailings materials from a plurality of mining areas, determining the yield stress and the plastic viscosity of the paste filling slurries through a rheological test, and constructing a prediction model data set; performing feature optimization by using F-test and Pearson's correlation coefficient test, and determining a core feature having significant correlation with a target parameter as an input feature variable; an extreme gradient boosting tree model, an error reverse propagation neural network model and a K-nearest neighbor model are selected as base learners, a linear regression model is taken as a meta learner, an integrated prediction model is constructed, and model training and hyper-parameter optimization are performed by adopting five-fold cross validation and a Bayesian optimization algorithm. Performance comparison results show that the prediction precision of the integrated model is obviously superior to that of each base learner, and rapid and accurate prediction of the rheological characteristics of the paste is realized.

This application discloses a high-strength, low-viscosity, anti-segregation modified steel slag concrete and its preparation method. The raw materials for this high-strength, low-viscosity, anti-segregation modified steel slag concrete include cementitious materials, coarse aggregate, fine aggregate, water-reducing agent, and water. The weight of the water-reducing agent is 1.0-1.5% of the total mass of the cementitious materials. The cementitious materials include silicate cement, mineral powder, fly ash, and steel slag powder. The water-reducing agent does not contain water-retaining and thickening components. The coarse and fine aggregates have consistent lithology, and the apparent density of both the fine and coarse aggregates is not greater than 2700 kg / m³. This application utilizes the high density of steel slag powder to increase the overall specific gravity of the paste, inhibiting the settling of aggregates during shear thinning. The gravity of the paste and aggregates can be balanced without the need for cellulose ethers. The water-reducing agent in this application does not contain water-retaining and thickening components, minimizing its impact on the fluidity of the concrete. It exhibits good plastic viscosity, significantly reducing the resistance of high-strength concrete during pumping.

The utility model discloses a high-precision stirring shaft lifting device which comprises a base and further comprises a detection mechanism, the detection mechanism is arranged on the top face of the base and used for detecting rheological property parameters such as plastic viscosity and yield stress of mortar, the detection mechanism comprises a groove plate fixedly installed on the rear side of the top face of the base, and a connecting frame is movably installed on the front side of the groove plate. The utility model relates to the technical field of detection devices. According to the high-precision stirring shaft lifting device, a stirring shaft body can be conveniently replaced through the arranged clamping block and the arranged inserting block, when the stirring shaft body needs to be replaced, a pulling plate is pulled to drive the inserting block to be pulled out of an inserting groove, then the stirring shaft body is taken down, then the proper stirring shaft body is taken up, and the clamping block is inserted into a clamping groove; the clamping groove is loosened, the insertion block is driven to be inserted into the insertion groove through the elastic force of the spring, the position of the stirring shaft body is fixed through the clamping block, replacement is convenient, and the practicability is good.

The invention relates to the technical field of grouting materials, in particular to a high-performance prestressed duct grouting material which comprises water, cement, silica fume, mineral powder, limestone powder, a water reducing agent, microbeads, a plastic expanding agent, a suspension stabilizer and a defoaming agent.The cement, the silica fume, the mineral powder, the limestone powder and the microbeads are used for constructing a multi-element mineral admixture system; the powder materials with different particle sizes are mutually filled, so that close accumulation among particles is realized, and the void ratio among the powder is effectively reduced, thereby reducing the water consumption required for filling gaps and improving the compactness and the homogeneity of the slurry; meanwhile, the water reducing agent efficiently disperses cement particles through the steric hindrance effect, the microbeads reduce the friction resistance in the slurry through the spherical ball effect of the microbeads, the plastic viscosity and yield stress of the slurry are remarkably reduced through the combined action of the water reducing agent and the microbeads, and the slurry is endowed with excellent initial fluidity and long-time fluidity maintaining capacity; and it is ensured that the slurry can be rapidly and smoothly filled in the prestressed duct.

An underwater anti-dispersion ultra-high performance concrete based on reversible network design, its preparation method, and its application. The ultra-high performance concrete comprises cementitious materials, water, polycarboxylate superplasticizer, and a synergistic anti-dispersion composite admixture; wherein the composite admixture consists of a main agent and auxiliary agents. The main agent and auxiliary agents are used to construct a three-dimensional reversible network structure with significant thixotropic properties in situ within the slurry, endowing the slurry with intelligent rheological properties of "shear thinning—static thickening": the yield stress reaches 50–320 Pa at rest to resist underwater erosion, and the plastic viscosity is maintained at 2–8 mPa·s during shearing to ensure pumpability. This invention effectively solves the problem of balancing rheological properties and anti-dispersion properties in ultra-high performance concrete systems, and is particularly suitable for the repair and reinforcement of underwater piers, pile foundations, and tunnel linings.

The invention relates to the technical field of building materials, and discloses a real-time measurement system for rheological parameters of a new concrete material, and the system comprises an image collection module which is used for obtaining a dynamic image sequence of the new concrete material in a motion state in real time; the image processing module is used for carrying out image registration on the intercepted effective analysis region sequence to obtain a preprocessed effective dynamic image sequence; the feature extraction module is used for inputting the preprocessed effective dynamic image sequence into an attention-enhanced graph convolutional neural network and three-dimensional convolutional neural network fusion model, and extracting a space-time fusion feature vector representing concrete rheological behaviors; the real-time inversion module is used for inputting the space-time fusion feature vector into a rheological parameter inversion model constrained by physical information, and inverting and outputting the yield stress and the plastic viscosity of the concrete material in real time; according to the invention, real-time and accurate measurement is realized.

The application provides a plugging agent for treating annular pressure, and a preparation method and application thereof. The plugging agent comprises urease activity liquid and superfine cement plugging paste. The urease activity liquid comprises urease-producing bacteria liquid and / or urease liquid, and is used for inducing the production of carbonate. The superfine cement plugging paste comprises superfine cement base material and calcium-containing early strength agent, and the average particle size D 50 of the superfine cement base material is ≤30 μm. The volume ratio of the urease activity liquid to the superfine cement plugging paste is (2-4):1. The plastic viscosity of the plugging agent is 5-30 mpa·s. The plugging agent provided by the application can effectively plug small-size micro cracks, improve the treatment effect of annular pressure, improve environmental protection, reduce production and construction operation cost, and is conducive to large-scale popularization and application.

The invention discloses a method for modifying zeolite through phosphoric acid based on pH feedback control and application of the zeolite in cement-based materials, and belongs to the technical field of building materials. The method comprises the following steps: S1, putting zeolite into a phosphoric acid solution for soaking reaction; s2, monitoring the pH value of a reaction system in real time; and S3, stopping the reaction when the change amount of the pH value in at least 30 minutes is less than 0.05, so as to obtain the phosphoric acid modified zeolite. According to the method, a traditional fixed time mode is abandoned, and precise control over the zeolite dealumination and pore structure optimization process is achieved. The specific surface area and the pore volume of the zeolite powder treated by the method disclosed by the invention are remarkably optimized, and when the zeolite powder serving as an auxiliary cementing material is doped into a cement-based material, the rheological property and the long-term hydration property of cement paste can be synergistically improved, which shows that the yield stress and the plastic viscosity are greatly reduced, and the shear thickening phenomenon under high doping amount is eliminated; meanwhile, the later-stage hydration promotion degree is improved, and the accumulated heat release is increased.

The invention relates to a multi-mode drilling fluid rheological parameter prediction method and device based on uncertainty weighting. The method comprises the following steps: collecting multi-mode (Bingham, power law and the like) rheological parameter data under multiple temperature, pressure and density conditions; preprocessing data and selecting temperature and pressure density as an input characteristic; selecting at least two machine learning models; training the model and estimating the prediction uncertainty (such as standard deviation and variance) of the model; and calculating the weight (the weight is inversely proportional to the uncertainty) of the model based on the prediction uncertainty of each model, and carrying out weighted fusion on prediction results of each model to obtain final rheological parameters (yield stress, plastic viscosity and the like). Aiming at the problems of low accuracy and poor robustness of drilling fluid rheological parameter prediction under the condition of limited data, by fusing multi-model prediction results and introducing an uncertainty weighting mechanism, the prediction accuracy and robustness are remarkably improved under a small sample scene, and the problem of prediction deviation caused by frequent adjustment of the drilling fluid is effectively solved.

This invention relates to the field of building materials technology and discloses a real-time measurement system for the rheological parameters of a new concrete material. The system includes an image acquisition module for acquiring dynamic image sequences of the new concrete material in motion; an image processing module for image registration of the extracted effective analysis region sequence to obtain a preprocessed effective dynamic image sequence; a feature extraction module for inputting the preprocessed effective dynamic image sequence into a fusion model of an attention-enhanced graph convolutional neural network and a three-dimensional convolutional neural network to extract a spatiotemporal fusion feature vector characterizing the rheological behavior of concrete; and a real-time inversion module for inputting the spatiotemporal fusion feature vector into a physically constrained rheological parameter inversion model to output the yield stress and plastic viscosity of the concrete material in real time. This invention achieves real-time and accurate measurement.

This application relates to the field of well workover fluid technology, specifically to a high-temperature resistant well workover fluid and its preparation method. The high-temperature resistant well workover fluid comprises the following raw materials: deionized water, modified anti-settling enhancer, temperature-resistant polymer thickener, heat stabilizer, viscosity stabilizer, bactericide, density regulator, and plugging agent. The preparation method of the high-temperature resistant well workover fluid is as follows: Density regulator and plugging agent are added sequentially to deionized water and stirred evenly; then the modified anti-settling enhancer and temperature-resistant polymer thickener are added and stirred evenly; next, the heat stabilizer and viscosity stabilizer are added, and the mixture is stirred at a constant temperature. After cooling to room temperature, the bactericide is added, stirred evenly, and allowed to stand for aging to obtain the high-temperature resistant well workover fluid. This high-temperature resistant well workover fluid exhibits outstanding high-temperature stability. After standing at 210℃ for 7 days, the density remains stable, and the parameters of plastic viscosity, dynamic shear force, and initial / final shear are reasonable, with no significant sedimentation, effectively improving the stability of the well workover fluid at high temperatures.