21 results about "Water flooding" patented technology

The application provides a device and method for simulating low-efficiency water drive thick oil viscosity reduction composite drive enhanced oil recovery, which comprises an injection system, a three-dimensional large-size sand filling model, a multi-well back pressure measurement and control system and a multi-well flow metering system. The injection system is connected to the three-dimensional large-size sand filling model, and fluid is injected into the three-dimensional large-size sand filling model which can simulate well pattern mode. The multi-well back pressure measurement and control system is connected to the three-dimensional large-size sand filling model, and the formation pressure is set. The multi-well flow metering system is connected to the three-dimensional large-size sand filling model, and the output fluid is metered. The device and method for simulating low-efficiency water drive thick oil viscosity reduction composite drive enhanced oil recovery can meet the enhanced oil recovery experiments of water drive, polymer drive, viscosity reduction drive, viscosity reduction composite drive and the like of three-dimensional large-scale heterogeneous reservoir models under different well pattern modes, and has important significance for the enhanced oil recovery of low-efficiency water drive thick oil reservoirs.

The application provides a method for realizing high-multiple water flooding core microcosmic residual oil dynamic characterization, which comprises the following steps: reconstructing digital images of pore space distribution and two-phase fluid distribution by using image processing method according to core microcosmic distribution images at different displacement moments obtained in the displacement process; taking the pore space at the initial displacement moment as a benchmark, calculating the local size of the pore structure, determining the critical cross section of different pore regions according to the derivative of the maximum local region of the core pore size change, and dividing the core microcosmic structure into pore regions; and statistically analyzing the dynamic change characteristics of the core microcosmic properties and fluid distribution at different displacement moments in the divided local pore regions, so as to realize the core microcosmic displacement dynamic characterization. The pore region division method provided by the application can decompose the complex core microcosmic pore structure into multiple pore regions, and can directly quantitatively characterize the dynamic response of the displacement core microcosmic properties and internal fluid characteristics from the local structure.

The application discloses a coal mine underground water flooding simulation method, which comprises the following steps: step 1, collecting roadway coordinates and floor elevations obtained by underground measurement, and representing underground connected roadways as a collection of multiple roadway sections; step 2, setting a water outlet position of water flooding simulation, determining a roadway section where the water outlet position is located, and determining a corresponding roadway section name, a starting point coordinate and a tail point coordinate; step 3, projecting a roadway model to obtain a water flow direction and a waterlogging position of water flooding simulation; and step 4, rotating a coordinate axis of the XZ or YZ plane roadway model in step 3 to obtain a ZX or ZY plane roadway model, calculating waterlogging volume by using the ZX or ZY plane roadway model in the rotated two-dimensional coordinate system, and simulating water flooding height. The application realizes quantitative water flooding simulation, and compared with an existing simulation water flooding model, the application realizes a data-driven model, and is more interpretable and universal.

This invention discloses a dynamic monitoring method for polymer flooding reservoir plugging based on multi-point pressure measurement. The method includes: uniformly setting multiple pressure measurement points along the axial direction of a sand-filled model; experimental system setup and debugging; multi-stage displacement experiments and pressure monitoring, sequentially performing water flooding, polymer flooding, and subsequent water flooding; experimental data acquisition, identifying pressure surge events; core plugging dynamic characteristic analysis, identifying pressure surge processes during subsequent water flooding, and analyzing the maximum amplitude of each pressure surge, pressure surge interval, first surge pressure measurement point, core response pressure measurement point, pressure coverage area, surge coverage, and core pressure measurement point migration trajectory; outputting plugging dynamic monitoring results, integrating and analyzing the results, and generating a chart of the core plugging migration trajectory during the subsequent water flooding stage of polymer flooding. This application can achieve synchronous and accurate acquisition of pressure data from different locations in polymer flooding reservoir cores, and can comprehensively capture the spatial distribution characteristics and dynamic evolution laws of core plugging.

The application discloses a kind of uninterrupted operation control method during the reconstruction of water power station drainage control system, belong to water power station automation control technical field.Transition control system is formed by building movable temporary control box, three redundant water level detection is used, and part of power cabinet is controlled by temporary control box;Transition system, old system, three water level redundancies of monitoring system are set, double backup control is formed;Original position removes old cabinet, installs new cabinet, only switches control signal line, does not remove pump body, does not move power cable;New system commissioning is used as redundancy with transition system and monitoring system, and finally all power cabinets are controlled uniformly.The application realizes reconstruction whole process without stopping pump, without interrupting drainage, eliminates the risk of water flooding plant, with low construction difficulty, low cost, high safety, suitable for upgrading and reconstruction of various water power station drainage systems.

The embodiment of the application provides a kind of river and lake shore zone remote sensing monitoring method and product, the river and lake shore zone remote sensing monitoring method includes: obtaining historical medium resolution remote sensing image data and historical high resolution remote sensing image data;From the historical medium resolution remote sensing image data, the end-member spectrum of typical ground object is extracted;The end-member spectrum is corrected according to the high resolution remote sensing image data and the interference of shadow or cloud layer is eliminated, and the target end-member spectrum matrix is obtained;According to the target end-member spectrum matrix, pixel unmixing is carried out on the medium resolution remote sensing image data to be decomposed, and the pixel unmixing result is obtained;According to the pixel unmixing result and water flooding frequency, water level amplitude area is determined;The shore zone monitoring range is determined according to the water level amplitude area;The image data corresponding to the shore zone monitoring range is input into wavelet transform U-Net deep convolutional neural network model, and the shore zone land use classification result is obtained;According to the shore zone land use classification result, the ecological shore zone ratio result of each river section is quantified.

The present disclosure relates to a multi-point sterilization method for inhibiting the viscosity loss of oilfield ASP polymer, which adds the sterilization agent according to different stages of the ASP, wherein the sterilization agent adding point is arranged on the external delivery pipeline of the sewage station in the blank water flooding stage and the subsequent water flooding stage; the sterilization agent adding point is arranged at the inlet of the water injection pump of the water injection station in the pre-polymer slug stage and the subsequent polymer protection slug stage; the sterilization agent adding point is arranged on the low-pressure binary pipeline of the binary deployment station in the ASP main slug stage and the ASP auxiliary slug stage; after the application of the present application, the viscosity loss of the three-component system is controlled within the 20% index range, which has a wide application prospect for reducing the cost and increasing the efficiency of the ASP, and provides important support for ensuring the development effect of the original system of the ASP.

The application discloses a gel microsphere profile control agent application scene determining fractured core plugging experiment method, and comprises the following steps: S1, primary water flooding; S2, core fracture making: S2-1, making full open type fracture; S2-2, making closed type fracture; S3, gel microsphere profile control agent displacement; S4, secondary water flooding.The application provides a special fractured core plugging experiment method for the characteristics of high shear resistance and high salt tolerance of the gel microsphere profile control agent, especially when the closed type fracture is made, the influence of various factors is comprehensively considered, so that a more accurate fracture cutoff position is obtained, the demand of the gel microsphere profile control agent is met, the experiment result accuracy is improved, and the plugging effect of the full open type fracture is compared, finally, a perfect experiment step system is formed, so that the gel microsphere profile control agent has practical application value when being used in a reservoir with strong heterogeneity and large pore throat size difference.

The application provides an AVP-based automatic driving-out method and system for a flooded underground garage, and relates to the technical field of vehicle control. The method comprises the following steps: after a target vehicle completes parking in a garage through an AVP, collecting garage environment data and vehicle state data of the target vehicle to predict a water flooding risk level of the target vehicle; when the water flooding risk level reaches a level threshold, planning a path for the target vehicle to drive out of the garage to obtain a vehicle driving-out path; and controlling the target vehicle to wade along the vehicle driving-out path through the AVP, and parking the target vehicle after it drives out of the garage. The application is used to solve the problem that the prior art garage and vehicle are not linked to perform water accumulation warning to determine the water flooding risk, and the AVP does not design a response logic for the vehicle in a water flooding scenario.

The present application belongs to the technical field of oil and gas development, and particularly relates to a gas-liquid full-mixed-phase oil displacement method under supercritical state. The method comprises the following steps: mixing supercritical gas and injection liquid in a volume ratio of 1:1-4 under the conditions of 1.1-1.3 times of the critical pressure and 1.0-1.2 times of the critical temperature of the supercritical gas, and then injecting the mixture into a pump under the conditions of 20-25 MPa and a flow rate of 3-13 m³ / h, determining the injection rate according to the permeability of the oil reservoir, and injecting the mixture into the oil reservoir through a water injection well or a production well, wherein the injection liquid is obtained by diluting the oil displacement agent with water at a ratio of 1-5 parts by weight. The oil displacement method can significantly improve the oil recovery rate, and the oil displacement recovery rate of low-oil-saturation heavy oil reservoirs is improved by 28% compared with traditional water flooding, the oil displacement recovery rate of low-permeability oil reservoirs is improved by 32% compared with traditional gas flooding, and the waste gas storage rate reaches 82%, which has remarkable environmental benefits.

The application relates to a kind of three types of oil layer blank water drive stage injection-production well adjustment chart establishing method, and relates to the field of tertiary oil recovery of three types of oil layer, solves the problem that existing three types of oil layer is obviously different from type 1 oil layer and cannot be completely applied to type 1 oil layer tracking adjustment technology.The method comprises the establishing method of injection well and production well adjustment chart;the establishing method of injection well adjustment chart comprises: taking injection-production ratio of injection well as the length of rectangle, the length range is 0-1.4, taking pressure space as width, the length range is 0-10, constructing rectangular chart;the chart is divided into five regions, which are reasonable area, speed-up area, fracturing area, speed-down area and speed-down and production control area;the establishing method of production well adjustment chart comprises: taking flow pressure of production well as the length of rectangle, the length range is 0-7.0, taking daily liquid production as width, the length range is 0-50, constructing rectangular chart, and there are four regions on the chart, which are fracturing area, small participation area, reasonable area and large participation area.

The application relates to a model-based ship cabin water flooding floating state calculation method, S1, calculating the total weight of a ship after water flooding and the changed center of gravity G1; S2, establishing an initial floating center B, an initial center of gravity G, the center of gravity G1 after water flooding, the intersection B' of the horizontal line through the floating center B and the vertical line through the center of gravity G1, taking a point P on BB', connecting G1P, and making the vertical plane of G1P as a waterline plane WpLp model; S3, determining the WpLp height along the G1P direction according to the △, and obtaining the floating center position Bp under the WpLp based on the model; S4, determining the two-division direction of the P point on BB' according to the change law of the floating center position with the movement of the P point, and starting the iterative calculation; S5, repeating S3 to S4 until the distance between the Bp point and the G1P straight line is less than a given precision, that is, the Bp point is considered to be collinear with the G1P, and the state is considered to be the final equilibrium floating state after the cabin is water flooded. The application takes the final steady-state equilibrium condition as the only constraint condition, has a wide application range, studies the floating center movement law, proposes a convergence criterion, and improves the efficiency and the precision.

The present application relates to a kind of rape wet damage tolerance experimental device, including two planting boxes, two planting boxes are all equipped with photosynthometer, planting groove, light source, temperature sensor, air conditioning system, humidity sensor, humidity regulator and water supply system;The method for carrying out rape wet damage tolerance evaluation is: in two planting grooves, all rape is planted, the temperature, humidity and illumination of two planting boxes are kept same, the soil of the rape in one planting groove is flooded by water at 3-4 leaf stage and is planted to wet damage to test end, another planting groove is planted healthily, on the fifth day and the sixth day of water flooding, the average number of two days of stomatal conductance of wet damage planting rape and healthy planting rape is obtained by the stomatal conductance detection of photosynthometer to two planting boxes.This application aims to provide a kind of rape wet damage tolerance experimental device, which is environment-controllable and can quickly and accurately judge the wet tolerance of rape, solves the problem that the environment is uncontrollable when testing the wet tolerance of rape, the data accuracy is poor and the experimental time is long.

The application relates to a kind of induced condensation reinforced drainage polar plate flow channel structures for fuel cell, comprising: flow channel and the protruding condensation island arranged on flow channel, flow channel includes: interval distribution contraction area and expansion area;The width of expansion area is greater than the width of contraction area;Multiple protruding condensation islands are staggered on flow channel, cooling channel is arranged in protruding condensation island, and cooling channel is used to cool the surface of protruding condensation island.Compared with prior art, the application has excellent drainage and gas transmission performance, uses airflow kinetic energy and local surface condensation and strong hydrophobicity to combine, induces two-phase flow pattern in flow channel, avoids the "water flooding" effect in flow channel and gas diffusion layer, reduces mass transfer resistance, improves fuel cell internal water management, and improves fuel cell overall performance and life.

The application discloses a CO2-ion water flooding molecular dynamics simulation method and belongs to the technical field of CO2 oil displacement. The method comprises the following steps: establishing oil molecule models, water molecule models, CO2 molecule models, CaCl2 molecule models and graphene plate models corresponding to the characteristics of a target oil reservoir; optimizing the geometric structures of the models; assembling the optimized molecular models into a CO2-CaCl2-H2O ternary displacement system and performing molecular dynamics simulation; selecting an NVT ensemble during simulation, applying a periodic boundary condition, adopting a COMPASS II force field and configuring atomic potential parameters, running energy minimization and temperature initialization, and then performing displacement process simulation; quantitatively evaluating the oil displacement effect of the displacement medium of the CO2-CaCl2-H2O ternary system based on a trajectory file output by simulation; and the application can better explain the behavior of molecules under the synergistic action of multiple displacement media, reflect the oil displacement microscopic mechanism under the synergistic action of multiple displacement media, and has important significance for optimizing the development effect of tight oil reservoirs and improving the recovery rate.

The application discloses a kind of based on correction capillary number thickened oil water drive main control factor analysis and recovery factor prediction method.The method includes: obtaining fluid property parameters, interface property parameters and core physical property parameters in thickened oil water drive process;Carry out thickened oil water drive experiment under different working conditions, obtain recovery factor data;Calculate correction capillary number, the correction capillary number includes oil-water viscosity ratio and core physical property parameters, for representing the relative action of viscous force and capillary force under high oil-water viscosity ratio condition;Quantitative prediction model between recovery factor and correction capillary number is established by determining correction coefficient through experimental data regression;The model is applied to thickened oil water drive recovery factor prediction and injection parameter optimization under different injection rates, temperature and permeability conditions.The application realizes the unified quantitative characterization of thickened oil water drive main control force under high oil-water viscosity ratio condition, establishes recovery factor quantitative prediction method, and provides theoretical basis for thickened oil water drive development plan optimization.

This application provides a fracturing sliding sleeve and a fracturing system, belonging to the field of fracturing technology. The fracturing sliding sleeve includes a casing and a valve core assembly. The side wall of the casing is provided with an oil collecting hole and a fracturing hole communicating with the casing. An adjustment device for controlling the oil-water ratio is provided in the oil collecting hole, and an identification module for identifying the location of the casing is provided in the casing; it is slidably connected inside the casing. By providing an oil collecting hole and a fracturing hole on the casing, during the fracturing process, the oil collecting hole is closed and the fracturing hole is opened, and the fracturing fluid flows out from the fracturing hole to the outside of the bottom layer. After fracturing is completed, the oil collecting hole is opened and the fracturing hole is closed, allowing oil and gas to enter the casing from the oil collecting hole. When passing through the adjustment device in the oil collecting hole, the oil-water ratio in the oil and gas is regulated, thereby reducing the water content in the oil and gas after being regulated by the adjustment device, that is, reducing the proportion of water in the oil-water ratio and increasing the proportion of oil in the oil-water ratio, effectively reducing water channeling, and at the same time reducing the risk of water flooding in the well.

The application discloses a water flooding degree and saturation change determination method and device, electronic equipment and a storage medium. The method determines at least one first geological model based on a preset number of dry rock samples; generates a second geological model corresponding to each first geological model based on the at least one first geological model; performs forward modeling on the first geological model and the second geological model for each first geological model and the second geological model corresponding to each first geological model, to obtain first seismic data and second seismic data; determines seismic difference data; extracts data from the seismic difference data to obtain seismic attribute data of at least three seismic attributes; and inputs each seismic attribute data into a pre-trained prediction model to obtain a target water flooding degree and a target saturation change corresponding to each seismic attribute data, thereby realizing rapid determination of the water flooding degree and the saturation change by using a deep learning network.

The present application relates to the technical field of oilfield water flooding development adjustment, and particularly relates to a method and device for determining pore volume of large pore channels in small layers in a medium-high permeability oilfield, which comprises the following steps: determining the mobility before and after the development of large pore channels according to the water absorption of small layers, porosity, effective thickness of small layers, bottom hole flowing pressure of injection wells, bottom hole flowing pressure of production wells, injection-production well spacing and wellbore radius; determining the mobility variation before and after the development of large pore channels according to the mobility before and after the development of large pore channels, and determining the water absorption variation before and after the development of large pore channels according to the water absorption of small layers before and after the development of large pore channels; determining the seepage time of injected water from the bottom of a water well to the bottom of an oil well according to the mobility variation, and determining the pore volume of well groups according to the seepage time and the water absorption variation. The present application takes into account factors such as irregular well pattern and heterogeneity, and can obtain accurate pore volume of large pore channels in different small layers, thereby providing a basis and guidance for the optimization of oilfield development adjustment parameters.