8 results about "Percolation process" patented technology

The application discloses a kind of multilayer heterogeneous reservoir percolation simulation analysis methods based on digital core, including obtaining the three-dimensional digital core model of high-permeability reservoir sample, medium-permeability reservoir sample and low-permeability reservoir sample;Get the pore network model after commingling;Based on the pore network model after commingling, simulate oil-water displacement and suction process by percolation theory, calculate the corresponding capillary pressure curve and relative permeability curve, and compare and analyze percolation characteristics.The beneficial effects of the technical scheme proposed in the application include: based on the pore network model after commingling, simulate oil-water displacement and suction process by percolation theory, calculate the corresponding capillary pressure curve and relative permeability curve, and compare and analyze percolation characteristics.Thereby, the multilayer heterogeneous reservoir percolation process can be simulated, and the interlayer interference influence mechanism and residual oil distribution characteristics during multilayer commingling in the reservoir with large differences in low-permeability and heterogeneity can be truly reflected.

The invention discloses a parameter acquisition method and system for a reactive seepage dissolution and precipitation process and a medium. Relates to the technical field of geological storage. Carrying out a reactive seepage test, and collecting image data and seepage pressure data in real time; preprocessing the image data, and analyzing and calculating the variation of precipitation pixel points and the precipitation amount in the reactive seepage process; inputting the variation of the precipitation pixel points and the seepage pressure data into a constructed precipitation parameter relation model to obtain precipitation process parameters; according to the scheme, a carbon dioxide geological storage project is guided based on the precipitation process parameters, and real-time calculation of the porosity and the permeability in the reactive seepage dissolution precipitation process is realized based on a constructed precipitation parameter relation model through real-time image acquisition and real-time pressure monitoring of a reactive seepage test; the method has the advantages of being easy to operate, few in process, low in cost, high in precision and good in timeliness.

The invention belongs to the field of gas field development, and particularly relates to a novel method for predicting flowing bottomhole pressure of a multi-section fractured horizontal well based on three-phase seepage. In the method, in order to solve the problem that a traditional flow-back model cannot accurately describe the dynamic influence of gas release and expansion on flow-back due to simplification of a multiphase seepage process, the well bore oil nozzle throttling effect and a fracture network three-phase seepage equation are combined, and the well bottom flowing pressure change and the three-phase saturation change are synchronously solved by adopting a dynamic iterative algorithm; and quality conservation is ensured by using an improved trapezoidal integral method, and full-life-cycle dynamic prediction from flowback of the fracturing fluid to long-term production is realized. The method has theoretical rationality and practical production application value in practical application of gas reservoir extraction.

Disclosed herein is a purification process comprising an organic ultrafiltration / diafiltration process in which a crude mixture containing a conjugate compound to be purified is filtered through a semipermeable membrane and the filtrate from the crude mixture is replaced with an exchange medium containing an organic solvent and a buffer system.

The invention belongs to the technical field of solid waste treatment, and particularly relates to a thallium pollutant binder and a thallium pollutant curing method. The binder provided by the invention is composed of ordinary Portland cement and an auxiliary cementing material in a mass ratio of 7: 3, wherein the auxiliary cementing material is one or a combination of more of metakaolin, silica fume and lime. The raw materials of the binder are simple and easy to obtain, and the binding effect is remarkable. In addition, the invention further provides a thallium pollutant immobilization method, the thallium immobilization effect of the method is obviously better than that of a traditional ordinary Portland cement immobilization method, and the thallium removal rate reaches 97%. Through characterization technologies such as thermogravimetric analysis, scanning electron microscope-energy spectrum analysis and the like as well as a toxic characteristic percolation process and a compressive strength experiment, the migration and transformation behavior of the Tl in a cement curing matrix is defined, the immobilization mechanism of the Tl in the system is determined, and it is embodied that the curing method can avoid secondary migration and diffusion of the Tl in the sediment, and the curing effect of the Tl in the sediment is improved. The ecological risk is reduced.

The invention discloses a rough fracture invasion-percolation two-phase flow simulation method, which comprises the following steps of: dividing a rough fracture opening field by adopting a plane grid unit, establishing an invasion-percolation two-phase flow numerical model, and simulating a displacement process as a quasi-static interface propulsion process. The unit with the minimum capillary pressure threshold value in the unit time step is invaded and displaced; a Young-Laplace equation is adopted, the curvature radius in the plane and the curvature radius in the opening direction are calculated, and the capillary pressure threshold value of each unit to be displaced is determined; a binary tree data structure is adopted, displacement process information of each unit is recorded, and in a single time step of displacement, the changed binary tree data structure is updated; and in combination with a deep search algorithm and a width search algorithm, unit position information of capillary capture is discriminated and found. According to the method, the influence of the curvature in the plane on the intrusion displacement process is considered, and an efficient data structure and a search algorithm are combined, so that the accurate and efficient simulation of the intrusion-percolation displacement process in the rough fracture is realized.

This invention relates to a numerical simulation method for water injection-induced dynamic fracture seepage considering the percolation mechanism. The steps are as follows: Step 1: Model establishment; Based on the basic equations of oil-water two-phase flow, considering the dual effects of percolation and displacement on oil-water flow and water injection-induced dynamic fractures, the capillary force model, relative permeability model, and matrix fracture flow rate of the displacement and percolation processes are respectively incorporated into the flow control equations to establish a mathematical model of water injection-induced dynamic fracture oil-water two-phase seepage under the dual effects of percolation and displacement; Step 2: Model solution; The fully implicit finite difference method is used to obtain the dynamic fracture oil-water two-phase seepage field data considering the dual effects of percolation and displacement. This invention can more accurately characterize the actual seepage environment of the reservoir and has higher accuracy in predicting development indicators.

The present application belongs to the field of gas field development, and particularly relates to a new method for predicting bottom hole flowing pressure of multi-stage fractured horizontal well based on three-phase percolation. In the present application, in order to solve the problem that the traditional flowback model cannot accurately describe the influence of gas release and expansion on flowback dynamic due to the simplification of the multi-phase percolation process, the wellbore choke effect is combined with the three-phase percolation equation of the fracture network, the dynamic iteration algorithm is used to synchronously solve the change of bottom hole flowing pressure and the change of three-phase saturation, the improved trapezoidal integration method is used to ensure the mass conservation, and the whole life cycle dynamic prediction from fracturing fluid flowback to long-term production is realized. The method has theoretical rationality and practical production application value in the actual application of gas reservoir stimulation.