35 results about "Conditional simulation" patented technology

A new method is presented for generating a probability map, a cutoff map, and a confidence limit map in one single operation. In addition, the new method can also generate a cube representing a cubic volume of earth formation by using the same method for generating the aforementioned maps. This is accomplished by:(a) gridding a cross section, (b) Kriging the gridded cross section thereby producing a plurality of expected values and a corresponding plurality of standard deviations associated, respectively, with the plurality of intersections on the gridded cross section, (c) generating a plurality of probability density functions which correspond, respectively, to the plurality of expected values / standard deviations of the plurality of intersections, (d) integrating each of the probability density functions thereby generating a plurality of cumulative distribution functions which correspond, respectively, to the plurality of probability density functions, (e) choosing a value from each of the cumulative distribution functions associated with each of the intersections of the gridded cross section, and (f) assigning such value to its associated intersection of the gridded cross section and assigning a unique color to each such value, thereby generating a map illustrating the characteristics of the cross section through the earth formation. Since a cube includes a plurality of gridded cross sections, by generating a map for each cross section, the new method will generate the cube.

The invention relates to a method of performing an oilfield operation of an oilfield having at least one wellsite, each wellsite having a wellbore penetrating a subterranean formation for extracting fluid from an underground reservoir therein. The method includes determining a time-step for simulating the reservoir, the reservoir being represented as a plurality of gridded cells and being modeled as a multi-phase system using a plurality of partial differential equations, calculating a plurality of Courant-Friedrichs-Lewy (CFL) conditions of the reservoir model corresponding to the time-step, the plurality of CFL conditions comprising a temperature CFL condition, a composition CFL condition, and a saturation CFL condition, simulating a first cell of the plurality of gridded cells with an Implicit Pressure, Explicit Saturations (IMPES) system, and simulating a second cell of the plurality of gridded cells with a Fully Implicit Method (FIM) system.

The invention discloses a rapid seismic random inversion method based on the horizontal constraint. The method comprises the steps of performing spatial structure analysis on the well data to obtain the variation function, solving the target interval horizontal correlation function, non-conditional simulation implementation, conditional processing and disturbance optimization for obtaining the optimal solution. The problems that the horizontal continuity of conventional random inversion is poor, the geological characteristics of the underground reservoirs cannot be effectively reflected, the operation speed is slow and the calculation efficiency is low can be solved. The horizontal correlation function is added in the covariance function of conventional calculation to act as the constraint, and random inversion is realized by using fast Fourier sliding mean spectral simulation with combination of the progressive deformation update method so that the inversion result is enabled to achieve the effect of high longitudinal resolution and great horizontal continuity. Compared with the conventional random inversion, the horizontal continuity of the inversion result can be enhanced, the calculation efficiency can be enhanced and the method plays an important role in subsequent reservoir identification and oil reservoir description.

The invention provides a coal rock three-dimensional strain field visualization system and method under a complex geological structure. The system comprises a stress condition simulation system and astrain monitoring system. The stress condition simulation system comprises an analog simulation experiment frame, a loading system and a circular slideway. The method comprises the steps of preparinga 3D printing wire rod, printing a strain visualization similar model, simulating a stratum inclination angle and a gas-containing condition, applying a stress field, recording a micro-capsule ruptureand dyeing condition in the model and the like. The system can realize tracking of generation and development of cracks in a complex geological condition analog simulation model, and track three-dimensional movement of internal ink dots to draw a displacement field four-dimensional image.

The invention discloses an acid fracturing simulation method considering a dynamic process of variable viscosity acid. The method comprises the following steps of: respectively measuring the relationship between the viscosity of the variable-viscosity acid and a shearing rate, temperature, calcium ion concentration, a pH value and surfactant concentration and establishing a variable-viscosity constitutive equation, simulating the flowing and reaction process of the variable-viscosity acid liquid in a fracture system to obtain a pressure profile in the fracture system, simulating and calculating the reaction process of the variable-viscosity acid in a matrix by taking the pressure profile in the fracture system as an inner boundary condition and the ground pressure as an outer boundary condition, simulating the viscosity change condition of the acid liquid in the matrix system and calculating to obtain the filtration speed, and bringing the obtained filtration speed into the pressure profile in the fracture system in the step. The method is used for solving the problem that in the prior art, the acid fracturing simulation technology does not consider the dynamic filtration process of the variable-viscosity acid, so that the coincidence rate of the variable-viscosity acid fracturing simulation fracture length and the actual situation is not high, and the purpose that the acid fracturing fracture form considering the dynamic reduction rate of the variable-viscosity acid can be obtained through simulation is achieved.

Systems and methods for updating a property map during conditional simulation or unconditional simulation using interactive azimuth guidelines, well data and / or variogram parameters.

The invention provides a coal rock three-dimensional strain field visualization system and method under mining influence. The system comprises a stress condition simulation system and a strain monitoring system. The stress condition simulation system comprises an analog simulation experiment frame, a loading system and a circular slideway. The method comprises the steps of preparing a 3D printingwire rod, printing a strain visualization similar model, simulating a stratum inclination angle and a gas-containing condition, applying a stress field, recording a micro-capsule rupture and dyeing condition in the model and the like. The system can realize tracking of generation and development of cracks in a complex geological condition analog simulation model, and track three-dimensional movement of internal ink dots to draw a displacement field four-dimensional image.

The invention discloses a multi-particle-size filler filling type composite material fluidity simulation method. The method comprises the following steps: setting geometric information of a filler, and dividing unit grids according to the maximum filler particle size; according to discrete element simulation, filler physical property parameters and filler-filler and filler-wall surface contact models are determined, and a particle generator and model boundary conditions are defined; generating a particle random distribution structure by adopting a particle diameter increasing method, and setting an initial velocity of particle linear distribution; determining density and viscosity models of the base material, setting boundary conditions, and simulating three-dimensional Couette flow of the base material at a given shear rate; generating a dynamic link library file by discrete element software, and importing a coupling file; adopting computational fluid mechanics software to set coupling parameters, and importing a coupling file; and calculating the viscosity of the composite material by combining the coupling calculation of computational fluid mechanics software and discrete element software. The method can more accurately and comprehensively analyze the viscosity change rule of various composite materials filled with fillers in different shapes.

The invention discloses a dry-type transformer mechanical vibration simulation analysis method under a highway transportation working condition, and the method comprises the steps: employing finite element simulation software HyperWorks to simulate the structural size, assembly relation and fixing form of a transformer to the maximum degree, guaranteeing the grid quality, and improving the solvingefficiency; starting from the perspective of probability statistics; selecting a corresponding road transportation machinery environment condition to simulate road surface bumping borne by the carrying vehicle; random vibration simulation of the transformer is completed; obtaining a stress response probability statistical value through simulation; comparing the mechanical strength attributes of the material; according to the method, the structure where the mechanical strength of the transformer is most likely to fail in the highway transportation process is judged, the problem that the randomness of road bump cannot be simulated through transient impact simulation is solved, the reliability of the transformer under the highway transportation working condition can be evaluated in advance in the product research and development stage, and the most reliable product structure is optimized.

The invention relates to a measurement and calculation method for a soil infiltration parameter of a field scale. The method comprises the steps of performing a K-S normality test on soil infiltrationparameter actual measurement data of each test point; obtaining soil infiltration parameter theoretical data obeying normal distribution; calculating a test variation function of the soil infiltration parameter theoretical data, and performing fitting on the test variation function by using a theoretical variation function model to obtain a theoretical semivariance function of the soil infiltration parameter; according to the theoretical semivariance function and a statistical eigenvalue, calculating a non-conditional simulation value Z*s of the soil infiltration parameter and a non-conditional simulation value Zs of the soil infiltration parameter of an untested position of a to-be-tested region; performing Kriging interpolation on the soil infiltration parameter actual measurement dataand the non-conditional simulation value Z*s of the soil infiltration parameter to obtain data Z*ok and Z*sok; and according to the non-conditional simulation value Zs and the data Z*ok and Z*sok, calculating a soil infiltration parameter value of the untested position of the to-be-tested region. According to the method, the technical support can be provided for optimizing ground irrigation systemdesign and improving field irrigation management level.

A ventilation guide device according to one embodiment of the present invention comprises: a structure data acquisition unit for acquiring structure data of a building; a simulation data acquisition unit that acquires simulation data for calculating the internal air quality state of the building; a condition selection unit that selects, on the basis of a user input, at least one condition that affects the internal air quality state of the building; a simulation unit that simulates the internal air quality state of the building by using a simulation model in which structural data of the building, the simulation data, and a selection value of a condition selected according to the input of the user are input; and a ventilation condition calculation unit that calculates, using the simulation model, a ventilation condition for improving the internal air quality state of the building.

The invention provides a soil heavy metal risk prediction method. Based on a sequential condition simulation method, the contents of various heavy metals in the soil in a target area can be estimated,and a visualized risk map of heavy metals in the soil is generated by integrating various heavy metal contents based on a Hakanson potential ecological risk index method. Compared with a traditionalKriging interpolation method, the sequential condition simulation method can better reflect the uncertainty of heavy metal distribution, overcomes the smoothing effect of the traditional Kriging interpolation method, and has better predictability; the Hakanson potential ecological risk index method can scientifically synthesize various soil heavy metal contents and obtains the more accurate assessment risk; the method is relatively intuitive to observe high-risk areas from the visible soil heavy metal risk map, makes preventive measures in time, and has good practicability.

The invention method of forming and detecting a supercooled water droplet used in a ground ice-formation condition simulation system, and the supercooled water droplet is formed by water mist sprayed by an atomizing device. The method comprises the following steps of initially determining water supply temperature and gas supply temperature of the atomizing device, and starting the atomizing device so as to spray the water mist; after the atomizing device works stably, placing a ground target simulation device at a test target position and / or a place close to the test target position, wherein the ground target simulation device comprises at least one simulation target, and the simulation target comprises a test surface facing to the water mist; adjusting the gas supply temperature and / or the water supply temperature according to a freezing state of the water mist deposited the test surface of the ground target simulation target on the test target position and / or the place close to the test target position, so as to enable the water droplet of the water mist at the target simulation target to just reach the supercooled water droplet state of the test requirements. The invention further provides a test method of the supercooled water droplet used in the method of forming the supercooled water droplet, and the ground target simulation device used in the test method.