33 results about "Sweep efficiency" patented technology

The application provides a low-grade oil reservoir water injection development effect evaluation method, comprising the following steps: S1, collecting core scale limit oil displacement efficiency data; S2, collecting well pattern controlled reserve degree data; S3, calculating sweep efficiency of the low-grade water drive oil reservoir; S4, correcting the sweep efficiency according to the changes of reservoir physical property parameters caused by near-well pollution and reservoir energy decline; and S5, calculating the reference recovery rate and evaluating the development effect. The application can effectively avoid collecting and arranging a large number of cumbersome production dynamic data, fully utilize the flow characteristics and dynamic physical property parameter evolution of the low-grade oil reservoir, accurately evaluate the development effect of the low-grade oil reservoir, and be beneficial to efficient development of the low-grade oil reservoir.

The application discloses a kind of well group control reserves chemical flooding sweep efficiency calculation method, comprising the following steps: (1), three-dimensional fine porosity and permeability model is established;(2), well group control reserves chemical flooding sweep efficiency calculation.This method can improve the accuracy of well group control reserves chemical flooding sweep efficiency calculation, so as to provide accurate basis for chemical flooding reservoir engineering design, numerical simulation accuracy, tracking adjustment and post-evaluation of implementation effect of scheme.Compared with the traditional chemical flooding sweep efficiency calculation, the method is more scientific, the concept is clearer, the index is more quantitative, and the chemical flooding sweep efficiency calculation result is more accurate and reliable, which has important significance for guiding oilfield production and development.

The application provides a CO2 oil displacement storage regulation optimization decision method and system, the method obtains a three-dimensional geological model, production dynamic data and monitoring data of a target working area; a component numerical simulation technology is used to fit a CO2 injection production dynamic history of the target working area, so that target operation parameters of a simulation operation model are adjusted and determined to obtain a matched production simulation operation model; a gas-oil ratio is determined according to the production dynamic data, and then a gas channeling index is calculated, and a target well group meeting the conditions of the gas channeling index is selected; a relationship curve distribution between a Peclet number, an oil increment and a component sweep efficiency is determined by simulating different injection speeds to determine an optimized target injection speed; and development parameters corresponding to different injection modes are simulated, and the target injection mode is determined in combination with the gas channeling index, the sweep efficiency and the miscibility degree. The scheme can overcome the defects of the prior art that the parameter optimization is not in place and the precision is insufficient, and can consider the particularity of the CO2 oil displacement mechanism to establish a regulation optimization strategy based on dimensionless parameters.

The application discloses a simulation device and method for improving the producing degree of a tight reservoir by using inter-fracture displacement and well sealing. The experimental device comprises a temperature and pressure loading module, a first core monitoring module, an automatic control module, a second core monitoring module, a liquid injection module and an inter-fracture displacement simulation module. The experimental method comprises a preparation step before the experiment, a data measurement step, and a real-time control step of the automatic control module, wherein the data measurement step comprises a reservoir environment simulation step, a liquid injection step, a well sealing and displacement step, and a data collection step. The experimental device and method consider actual factors such as the temperature and pressure environment of the reservoir, the flow rate of the fracturing fluid and the well sealing time, can realize the monitoring of the oil displacement amount and the semi-quantitative characterization of the fracturing fluid sweep efficiency, and thus provide a certain basis for the fracturing construction design of an oilfield.

The application provides a Pickering emulsified solvent profile control agent and a preparation method and application thereof. The Pickering emulsified solvent profile control agent comprises the following raw material components in percentage by mass: 1.0%-3.0% of nano-bentonite particles, 0.005%-0.05% of a surface modifier, 0.0005%-0.001% of a pH regulator, 5%-20% of solvent oil, and the balance of water. The Pickering emulsified solvent profile control agent has high viscosity, strong flow control and good stability. When applied to water flooding of thick oil cold production, the Pickering emulsified solvent profile control agent can effectively reduce the viscosity of thick oil, has high sweep efficiency, and can effectively improve the recovery rate of water flooding of thick oil cold production.

The invention discloses an emulsified particle channeling sealing agent for CO2 flooding as well as a preparation method and application thereof, and belongs to the technical field of CO2 flooding of oil reservoirs. The emulsified particle channeling sealing agent for CO2 flooding comprises the following components in percentage by weight: 20-30% of matrix asphalt, 1.6-2% of latex, 0.8-1.2% of a softening agent, 3-5% of an emulsifier, 0.1-0.5% of a dispersing agent, 0.4-1.3% of a pH regulator and the balance of deionized water. The emulsified particle channeling blocking agent for CO2 flooding can effectively block deep cracks or large pore channels of a reservoir, enlarge the sweep efficiency of CO2 in an oil reservoir and improve the CO2 flooding recovery efficiency, has excellent temperature resistance, acid resistance and salt resistance, and is harmless to a reservoir matrix.

The utility model belongs to the technical field of filtering equipment, and particularly relates to a filtering base plate with a back flushing function, which comprises a base plate and a back flushing device, a plurality of through holes are formed in the supporting disc, the supporting disc is arranged above the chassis, and a collecting cavity is formed between the supporting disc and the collecting plate; the filtering piece is fixed above the supporting disc; a purging pipeline is fixed to the upper surface of the collecting plate, a plurality of purging holes are formed in the purging pipeline, and the lower end of the collecting plate is connected with a conveying pipeline connected with the purging pipeline. The purging structure of the filtering chassis is improved, the purging pipeline is fixed on the upper surface of the collecting plate, the purging holes are formed in the purging pipeline, and the purging pipeline is connected with the conveying pipeline of the purging pipeline, so that a purging medium firstly enters the collecting cavity and then purges a filtering piece through the supporting disc, the maximum purging surface is realized, and the purging efficiency is improved. The purging efficiency is improved, and the purging pipeline is more convenient to connect.

The invention relates to a method and a device for determining an oil reservoir water flooding sweep efficiency. The method comprises the following steps: acquiring a relative permeability curve of an oil reservoir, geological reserves and cumulative oil production and water content at multiple times, and calculating to obtain a water flooding sweep coefficient at the corresponding time according to the relative permeability curve, the geological reserves and the cumulative oil production at the multiple times, obtaining multiple groups of data of the water content and the water flooding sweep efficiency according to the water content at the multiple times and the water flooding sweep efficiency at the corresponding time, and performing nonlinear fitting according to the multiple groups of data of the water content and the water flooding sweep efficiency to obtain a relational expression between the water flooding sweep efficiency and the water content; and according to the relational expression between the water flooding sweep efficiency and the water content, predicting to obtain the water flooding sweep efficiency corresponding to any water content. The relational expression, obtained through the method, of the water flooding sweep efficiency and the water content conforms to the actual development of oil reservoirs, and the change rule between the water content and the water flooding sweep efficiency can be well analyzed.

The application discloses a kind of automatic frequency tracking method and system based on sweep mode, frequency is swept by the way of combination of " rough sweep+fine sweep ", first by " rough sweep " of big step, " rough sweep " is the method of difference of adjacent frequency point reflected voltage to judge sweep direction, determine a smaller frequency range containing inflection point, in this frequency range, small step " fine sweep " is used, compare the size of each frequency point reflected voltage, the frequency point corresponding to the minimum reflected voltage is the resonant frequency point of accelerating tube.The application compared with traditional frequency discrimination type automatic frequency tracking method, on the basis of ensuring sweep precision, improve sweep efficiency, can quickly obtain the actual resonant frequency of accelerating tube.

The invention provides a compact low-permeability reservoir fracturing well pattern gas drive effect prediction method and system, and relates to the technical field of gas drive effect prediction. The method comprises the following steps: firstly, determining basic geometric parameters of a rhombic inverted nine-point well pattern of a target block and fracturing design parameters to be optimized; and constructing a well pattern embedded into the main fracture and a fracture parameterized model, and reflecting a coupling relationship between the fracture and matrix flow. A training sample is generated through experimental design, rapid flow simulation is conducted through a parameterized model, and space collaboration quantitative indexes such as a gas shortest breakthrough time index, an effective wave and coefficient correction factor and a displacement pressure gradient strengthening factor are calculated. Performing extended production dynamic simulation on part of samples to obtain key indexes such as accumulative oil production and accumulative gas-oil ratio, and training a machine learning agent model; and with maximization of the cumulative oil production and the gas shortest breakthrough time index and control of the cumulative gas-oil ratio as optimization objectives, a multi-objective optimization algorithm is adopted to obtain a Pareto optimal solution set, and a final recommendation scheme is screened out.

The present application provides a kind of shale oil horizontal well volume fracturing ultimate recoverable reserves prediction method, first based on the reservoir geological parameters of the horizontal well to be measured and adjacent horizontal well in the same block, establish productivity prediction model, calculate effective fracture network sweep efficiency using reservoir numerical simulation method, and establish effective fracture network sweep efficiency and maximum recoverable reserves correlation prediction chart;Secondly, the correlation coefficient between the geology and volume fracturing reconstruction parameters of the horizontal well to be measured and the fracture network sweep volume is calculated using grey relational analysis method, and the key control parameters affecting fracture network sweep volume are determined;Finally, the fracture network sweep volume prediction model coupled with key control parameters is established, the fracture network sweep volume of the horizontal well to be measured is obtained, the effective fracture network sweep efficiency is obtained, and the maximum recoverable reserves of the horizontal well to be measured is obtained using the correlation prediction chart. The method can quickly predict the maximum recoverable reserves of any horizontal well by establishing the correlation chart of effective fracture network sweep efficiency and maximum recoverable reserves.

This invention belongs to the field of oil and gas field reservoir engineering technology, specifically a method for characterizing the impact of clastic reservoir heterogeneity on reservoir efficiency. First, mineral composition, porosity and permeability, mechanical parameters, and spatial configuration of the study area are obtained. Based on the interlayer spatial configuration, flow units are divided to quantitatively evaluate the constraints of interlayers on effective reservoir space. Through creep experiments and alternating load experiments, mechanical property degradation models of different types of interlayers under long-term high pressure and injection-production cycles are established. A dynamic model of interlayer sealing capacity evolution is constructed to quantify its long-term potential to suppress vertical fluid flow. By coupling the interlayer volumetric sweep efficiency, the mechanical degradation model, and the sealing capacity evolution model, a comprehensive reservoir efficiency impact coefficient is established, enabling a quantitative evaluation of reservoir efficiency under different types of interlayer constraints. This invention elevates the impact of interlayer heterogeneity on reservoirs from a static description to a dynamic quantitative evaluation, providing a scientific basis for the site selection optimization and injection-production strategy formulation of underground reservoirs.

The invention discloses a poly-surface salt composite efficient oil displacement system with a specific in-situ emulsification behavior and application of the poly-surface salt composite efficient oil displacement system. In the oil displacement system, the concentration of an associated polymer is 1000-3000 mg / L; the concentration of the surfactant is 0.2 to 0.4 percent; the salt concentration is 1.2 to 1.8 percent; and the balance of water. The poly-surface-salt oil displacement system has the specific emulsification behaviors that high-water-content water forms a strong-emulsification high-viscosity emulsion with an oil phase, low-water-content water forms a low-viscosity weak emulsion and even is not emulsified, and the poly-surface-salt oil displacement system can be emulsified in situ with crude oil in the high-water-content water in a porous medium high-seepage channel to form a stable high-seepage-resistance emulsion; low-viscosity weak emulsion or even non-emulsion is formed in a low-permeability area under high oil content, low seepage resistance under high oil content is formed, higher heterogeneity regulation and control capability is achieved, the low-permeability sweep efficiency and the low-permeability flooding efficiency are higher, and the high and low-permeability recovery ratio is remarkably increased; intelligent in-situ emulsification profile control and displacement are expected to be realized in high-water-content and strong heterogeneous oil reservoirs; and the sweep efficiency and the oil washing efficiency are greatly improved, so that the recovery efficiency is greatly improved.

This invention discloses a method for evaluating the multiphysics coupling relationship in gas-driven oil extraction. The method includes: acquiring reservoir parameters and constructing a discrete topological space based on a graph data structure in memory; inputting the state vector into a physical information neural network surrogate model to perform phase transition dimensionality reduction calculations, outputting solid phase precipitation and viscosity fields; calculating dynamic real porosity by combining mechanical strain and chemical dissolution; generating a dynamic topology trimming operator based on percolation theory, modifying conductivity properties in the underlying memory to sever the mathematical connectivity of physical blockage zones; assembling a fully implicit Jacobian matrix based on the updated conductivity and iteratively solving it; finally, eliminating isolated dead zone volumes and generating an evaluation index containing a tensor of real sweep efficiency and phase blockage damage index. This invention eliminates the matrix singularity divergence problem, significantly improving simulation computing power and gas-driven evaluation fidelity.

The application discloses a shale oil horizontal well volume fracturing fracture network sweep efficiency comprehensive evaluation method and device, the method comprises the following steps: obtaining shale oil horizontal well volume fracturing mine field data, and obtaining effective fracture network reconstruction volume according to the mine field data; obtaining shale oil horizontal well core data, and obtaining imbibition sweep volume according to the core data; obtaining fracture network sweep efficiency according to effective fracture network reconstruction volume, imbibition sweep volume and shale oil horizontal well volume fracturing mine field data. The application can quantitatively calculate the effective fracture network reconstruction volume of the horizontal well volume fracturing proppant, compared with the current mainstream microseismic monitoring means, the method of the application greatly saves the test cost, the calculation method is simple and feasible, the accuracy is greatly improved, and the volume fracturing reconstruction effect evaluation is effectively supported.

The present application relates to a kind of fracture water breakthrough oil well horizontal well plugging length determination method, plugging method, belong to petroleum and natural gas exploration and development technical field.The determination method includes the following steps:1) determine the main water breakthrough section of oil well horizontal well;2) predict the comprehensive water cut and water drive volume sweep efficiency of reservoir injection-production well group under different plugging schemes;Various plugging schemes are centered on the main water breakthrough section, and the plugging length proportion of well section is different;The plugging section of each plugging scheme includes the main water breakthrough section;3) the comprehensive water cut and water drive volume sweep efficiency of each plugging scheme are weighted and averaged respectively, to obtain evaluation index parameter, and then determine the plugging length of fracture oil reservoir oil well horizontal well.The method can realize the purpose of reducing water and increasing oil, reducing the invalid displacement of injected water, guiding the water plugging measures of fracture reservoir injection-production well group, improving the swept volume of fracture reservoir and effectively supplementing formation energy, and ultimately achieving the purpose of improving the development effect of fracture reservoir.

The embodiment of the invention provides a method, device and equipment for calculating the carbon burying stock of an oil reservoir, and relates to the technical field of oil and gas development and carbon burying, the method comprises the steps that the optimal development simulation scheme in multiple development simulation schemes of the oil reservoir is determined, and each development simulation scheme corresponds to one combination of multiple carbon dioxide composite steam injection parameters; obtaining development dynamic data of the oil reservoir under the optimal development simulation scheme; the development dynamic data at least comprise the sweep efficiency data of the carbon dioxide composite steam and the saturation data of the oil reservoir fluid; according to the development dynamic data, the carbon dioxide burying amount of the oil reservoir is calculated by using the multiphase carbon burying mechanism model; and the multiphase carbon burying model is coupled with the association between the oil reservoir development dynamic state and the multiphase carbon dioxide burying amount. According to the multiphase carbon burying mechanism model, the burying amount is associated with the sweep efficiency and the multiphase fluid saturation, supercomputing resources needed by all-component numerical simulation are abandoned, and low-cost and high-precision carbon dioxide burying amount calculation is achieved.

This utility model discloses an associated gas power generation tail gas reinjection system, including a gas-liquid mixer connected to a tail gas outlet pipe and a liquid-liquid mixer. The liquid-liquid mixer is connected to the bottom of an oil well produced water storage tank and an additive storage tank via pipelines. A compressor and a gas-liquid distribution mechanism are sequentially connected to the outlet of the gas-liquid mixer. The gas-liquid distribution mechanism includes a main distribution pipe connected to the compressor outlet, with multiple branch distribution pipes connected to it. The outlets of the branch distribution pipes are connected to the injection well. This utility model provides an associated gas power generation tail gas reinjection system that can utilize associated gas power generation tail gas to increase production, reduce the gas injection cost for oilfield production enhancement, and achieve synergistic reinjection of power generation tail gas and oil well produced water, thereby improving sweep efficiency.

Described is a method for evaluating oil recovery. The method includes performing a pre-coreflood process, a coreflood process, and a post-coreflood process. The pre-coreflood process includes preparing heterogenous cores samples with different structural configurations. The coreflood process includes injecting a treatment into the core samples and obtaining nuclear magnetic resonance (NMR) measurements of the treated core samples. NMR measurements are compared to assess performance of the treatment. The post-coreflood process includes conducting an X-ray micro-computerized topography (CT) scan and a Saturate, Aromatic, Resin, and Asphaltene (SARA) analysis on the treated core samples.

The invention provides a longitudinal displacement wave and efficiency testing device and a calculation method for a huge thick oil and gas reservoir. The device comprises an injection system which comprises a displacement pump and a displacement fluid container, and an outlet of the displacement pump is communicated with an inlet of the displacement fluid container; the model system comprises a multi-tube parallel core clamping model, and pressure gauges for calculating displacement pressure are respectively arranged at an inlet and an outlet of the model; the produced liquid detection and treatment system comprises a gas-liquid separation device and a gas collection device, an outlet of the gas-liquid separation device is communicated with an inlet of the gas collection device, and the gas-liquid separation device is used for detecting produced oil quantity and produced gas quantity; wherein the multi-tube parallel core clamping model is used for simulating longitudinal formation distribution and simulating permeability heterogeneity and fluid heterogeneity of different cores, and the cores in the longitudinal direction are communicated. By means of the device and method, the displacement effect and the displacement sweep efficiency change characteristics of different depths during longitudinal displacement of the huge thick oil reservoir can be known.

A profile control design method suitable for a horizontal fractured reservoir belongs to the technical field of oil-gas field development, and comprises the following steps: S1, explaining formation parameters according to profile control well pressure drop test data, establishing a mathematical model based on the explained parameters, calculating fracture opening data, and realizing precision of profile control parameter calculation; s2, optimizing a profile control agent system and a slug combination mode, selecting a gel and water-swelling particle system with high plugging strength, and adopting a self-developed phenolic gel IV system; s3, the injection displacement matched with the properties of the profile control agent and the proper injection pressure change range are designed; and S4, on the basis of the profile control process parameter optimization method, a profile control design technical thought suitable for the horizontal fractured reservoir is achieved. According to the injection parameter optimization method for profile control of the horizontal fractured reservoir, effective plugging of a horizontal fractured dominant channel is achieved, the water flooding sweep efficiency is improved, and field application is guided.

The application provides a method for improving the recovery ratio of a heavy oil reservoir by using a foaming agent assisted steam drive and application, and relates to the technical field of oilfield development. The method comprises the following steps: injecting a steam pre-slug, injecting a nitrogen slug, injecting a foaming agent slug, and injecting a nitrogen mixed steam main slug. In the nitrogen mixed steam main slug, the injection speed ratio of nitrogen and steam is always kept at 1:(2-3), and the steam injection process maintains a slow injection in the early stage, a fast injection in the middle stage, and a slow injection in the late stage. The foaming agent comprises 8-15% of alpha-olefin sulfonate, 1-2% of sodium methyl cocoyl taurate, 12-18% of fatty alcohol polyoxyethylene ether, and 2-3% of lauryl hydroxyl sulfobetaine, and the rest is water. The method can greatly improve the sweep efficiency and displacement efficiency of the heavy oil steam drive, and improve the development effect of the heavy oil steam drive thermal recovery.

The invention belongs to the technical field of oil-gas field development, and relates to an injection-production method for inter-well remaining oil of a carbonate reservoir and application of the injection-production method. The injection-production method comprises the following steps: performing injection operation on an original injection well; the injection operation comprises water injection, gas injection and water and gas alternate injection; after the injection operation is finished, profile control and water plugging are conducted on the original injection well and the original oil producing well; at least one original oil producing well is converted into an injection well, at least two original injection wells are converted into oil producing wells, and injection operation is conducted on the injection wells. The number of the original injection wells converted into the producing wells is in positive correlation with the distance between the producing wells and the injection wells. At least one original injection well close to the injection well is converted into a producing well. By means of the method, the production degree of the residual oil of the carbonate reservoir is remarkably improved. By optimizing the injection-production strategy, fluid channeling and pollution are reduced, the sweep efficiency is improved, more remaining oil is effectively mined out, and therefore the overall recovery efficiency is improved.

The invention discloses a method for increasing production of low-permeability coal bed gas based on carbon dioxide cyclic injection and production, which comprises the following steps of: fusing multi-source data to construct a reservoir fracture network digital twinborn model, and realizing accurate characterization of fracture space distribution and communication relationship; and further calculating a breakthrough risk index and a transformation potential index of each fracture, and intelligently classifying the fractures into a high-risk early breakthrough channel and a potential favorable displacement auxiliary channel. On the basis, the method comprises the following steps: firstly, injecting a degradable intelligent material into a high-risk channel for selective temporary plugging, meanwhile, injecting transformation liquid into a potential beneficial channel for amplification, optimizing injection parameters by utilizing an updated model, and guiding the main force of the transformation liquid to enter the deep part of a matrix to effectively displace methane. And when the preset condition is met, the blocking material is degraded to convert the original channel into the output auxiliary channel. According to the method, the sweep efficiency and the methane recovery efficiency are remarkably improved, and the sealing reliability is enhanced.

The invention belongs to the technical field of oil reservoir dynamic monitoring, and relates to a composite high-temperature-resistant tracer system for evaluating fireflood sweep efficiency, which comprises a composite tracer system injection module for injecting a system containing an inert reference and a thermosensitive precursor tracer into a target oil reservoir; the output fluid acquisition and detection module is used for detecting and obtaining a reference concentration and the original concentrations of first and second characteristic fingerprint products generated by cracking of the thermosensitive tracer agent; the model building module is used for building a physical transmission standardization model based on the reference concentration; the decoupling module is used for calling the model to reversely decouple the original concentration to generate the purification chemical yield; the calculation module is used for calculating the ratio of the purification chemical yields of the two products to generate a thermal phase fingerprint index curve; and the reporting module is used for coupling the analysis index and the reference concentration to judge the channel thermal grade attribute and generating a report. The technical problem that in an existing fireflooding evaluation method, due to mutual coupling of the physical migration process and the thermochemical reaction effect, the heat effective wave and range cannot be accurately evaluated is solved.

The invention belongs to the field of oil reservoir development, and discloses a heavy oil composite cold production process and an implementation method thereof. A profile control-viscosity reduction-displacement three-step method is adopted, profile control liquid is prepared through a profile control agent, and the profile control liquid is pressed into an injection well; the nano composite viscosity reduction displacement fluid is prepared through the viscosity reducer, the composite viscosity reduction displacement fluid is pressed into the injection well, and the water displacement fluid is continuously pressed into the injection well for displacement. The problems of uneven displacement, low sweep degree, poor viscosity reduction effect and the like in the thickened oil recovery process are solved. The oil recovery rate is obviously improved, and the oil reservoir development life is prolonged.

This utility model provides a sweeping handle for use with oil tank cars on railway trestle bridges in oil depots. The sweeping handle includes a handle and a head. The handle is made of aluminum tube, with a reinforcing aluminum tube added from the middle to the end of the aluminum tube. The head consists of an aluminum plate, two semi-circular aluminum sheets, and oil-resistant and anti-static thick adhesive. The aluminum tube has a gap on one side of the handle connection for inserting the aluminum plate. The radius of the two semi-circular aluminum sheets is larger than that of the aluminum tube and covers the connection between the aluminum tube and the handle. The semi-circular aluminum sheets have screw holes and are fixed to the handle with aluminum bolts. The oil-resistant and anti-static thick adhesive is welded to the aluminum plate with three aluminum rivets. This effectively solves the problem of difficulty in collecting and recovering residual oil after unloading from the loading arms of oil tank cars on railway trestle bridges in the prior art. It has the advantages of being compact and flexible, highly practical, having high oil sweeping efficiency, low labor intensity, safety and reliability, and easy maintenance. It can effectively clean the residual oil in the oil tank car and ensure that the residual oil is not wasted.

The invention discloses a carbon dioxide oil displacement well completion pipe string which comprises a casing pipe, an oil pipe arranged in the casing pipe, a production packer, multiple sets of packing assemblies and an optical fiber pressure monitoring mechanism. The multiple sets of packing assemblies are located below the production packer and distributed at intervals, and the lower space, located below the production packer, of the casing pipe is divided into multiple sections of cavities. The oil pipe penetrates through the production packer and the multiple sets of packing assemblies, and a hydraulic control injection allocation device is arranged on the oil pipe section located in each cavity and connected to a control system through a hydraulic control pipeline. The optical fiber pressure monitoring mechanism is used for monitoring air pressure in the cavity; the control system cooperates with the air pressure measured by the optical fiber pressure monitoring mechanism, the opening degree of the hydraulic control injection allocator is adjusted through the hydraulic control pipeline, and then the carbon dioxide injection amount is adjusted. Through the cooperation of the hydraulic control injection allocator and the optical fiber pressure monitoring mechanism, the dynamic regulation and control of the gas injection amount of each layer of cavity is realized, the problem of low sweep efficiency caused by non-uniform gas injection of a traditional tubular column is solved, and the recovery efficiency can be greatly improved.

The present application relates to the technical field of optical filter chip, and particularly relates to a wide-tuning and fast-sweeping filter chip. The filter chip comprises a substrate, a distributed Bragg reflector, an electrode, a phase matching layer and a phase change material layer. The first distributed Bragg reflector and the first electrode are tightly stacked on the substrate. The upper and lower surfaces of the phase change material layer are respectively provided with the phase matching layers, one of which is arranged on the upper surface of the first electrode, and the other of which is sequentially and tightly stacked with the second electrode and the second distributed Bragg reflector. The upper surfaces of the first electrode and the second electrode are partially exposed for applying current or voltage. The phase change material layer changes the refractive index under the guidance of the current or voltage, so that the effective optical thickness of the first phase matching layer, the phase change material layer and the second phase matching layer changes, and tuning is realized. The advantage is that the wavelength tuning accuracy is repeatable and controllable, and the sweep efficiency is high.

The present application relates to shale oil development gas drive mining technical field, disclose a kind of shale oil gas displacement front evaluation method based on three-dimensional seismic ant body attribute, including obtaining reservoir and fluid basic parameter and carrying out dimension elimination and standardization processing, form initial multi-source evaluation data;Based on initial multi-source evaluation data, the manifold dimension reduction of high-dimensional fracture perception data body and linear feature embedding processing are carried out, and core feature parameter is extracted;Permeability, start-up pressure, displacement time and sweep efficiency calculation model are sequentially constructed according to core feature parameter, and the corresponding four physical parameters are obtained;The above physical parameters are dimensionless and weight calculation, and multidimensional normalization data and dynamic weight coefficient are obtained;Fusion multidimensional normalization data and dynamic weight coefficient are comprehensively evaluated, and the final evaluation result is output.The present application solves the problem of evaluation distortion caused by complex fracture network, improves the evaluation accuracy, and guides the gas injection and production construction.