551 results about "Unconventional oil" patented technology

The invention relates to the technical field of unconventional oil-gas exploration, and discloses a well-seismic integrated horizontal well geosteering risk evaluation method, which comprises the following steps: S1, acquiring three-dimensional seismic data, measurement while drilling data and geological logging data through a well-seismic integrated data acquisition platform; s2, constructing a horizontal well geosteering dynamic model based on multi-source heterogeneous data, and integrating a seismic inversion result and real-time drilling parameters; by establishing a well-seismic data dynamic fusion mechanism and a multi-source risk quantification model, the problem of space-time dislocation of seismic inversion and measurement-while-drilling data is solved, the recognition precision of a fault boundary, a lithologic interface and a pressure abnormal zone is ensured to be matched with drilling position changes in real time, risk misjudgment caused by model updating lag in a traditional method is eliminated, and the accuracy of the method is improved. The accuracy and timeliness of geosteering decision making of the complex structure area are improved; by monitoring well track deviation and geological model prediction deviation in real time, the risks of well wall instability and target deviation are avoided, and the operation safety of the horizontal well in the full life cycle is guaranteed.

The invention discloses a method for calculating the migration of a proppant in a horizontal well fracturing crack and the global flow conductivity of the crack, and relates to the field of unconventional oil and gas reservoir yield increase renovation, and the method comprises the following steps: (1) establishing a reservoir geologic model according to on-site logging exploration data; (2) establishing a hydraulic fracturing crack propagation fluid-solid coupling model; (3) establishing a horizontal well fracturing inter-cluster flow distribution model; (4) constructing a propping agent migration liquid-solid two-phase flow model in the hydraulic fracture; (5) solving the fluid-solid coupling model and the proppant migration model through loop iteration, and predicting the concentration distribution of the proppant in the hydraulic fracture; and (6) on the basis of the crack width and the proppant distribution result, calculating the hydraulic fracturing crack global flow conductivity. According to the method, the proppant migration model is solved by adopting a high-order discrete format, dynamic coupling simulation of hydraulic fracture propagation and proppant migration under the mine field scale is realized, the global flow conductivity of the hydraulic fracture is calculated, and reference is provided for evaluation and optimization of unconventional reservoir fracturing transformation.

The invention relates to a lacustrine facies shale conductive model considering organic matter influence and a saturability evaluation method, and belongs to the technical field of unconventional oil and gas reservoir oiliness evaluation, and the method comprises the following steps: 1) representing fluid information in a shale sample based on a pressure-maintaining closed sample and a two-dimensional nuclear magnetic resonance technology; 2) according to the organic carbon content and the clay content of the shale, dividing the lithology type of the lacustrine facies shale, and analyzing the relation between different lithology resistivity values and the porosity of free water and bound water; 3) selecting a siltstone interlayer sample, and inversely calculating a cementation index and a saturation index of the inorganic pore conductive network; 4) establishing a lacustrine facies shale parallel conductive model, and calibrating rock-electricity parameters according to lithology; 5, a lithology discrimination chart, a TOC prediction model, a bound water content prediction model and an effective porosity calculation model are established, and the oil saturation is explained according to different lithologies in combination with the lacustrine facies shale parallel conduction model.According to the method, accurate shale reservoir fluid information is provided, and a brand new thought is provided for rock electrical parameter calibration.

The embodiment of the invention provides an unconventional oil reservoir oil extraction contribution degree determination method and device, equipment and a medium. The method comprises the steps that the relation between the saturation degree of wet-phase fluid and capillary pressure in an oil reservoir is determined according to a plurality of reference capillary pressure curves; performing simulation analysis on the crack propagation direction and the seepage pressure in the oil reservoir volume fracturing process, and determining a three-dimensional propagation rule of the crack and artificial crack parameters; performing coupling processing on the three-dimensional fracture model and the matrix attribute model to obtain an oil reservoir geological engineering integrated model; establishing a numerical simulation model according to the relationship between the wet-phase fluid saturation and the capillary pressure and the reservoir geological engineering integrated model; performing numerical simulation on the oil reservoir development process through the numerical simulation model to obtain data simulation results of the oil reservoir in different development stages; the oil production contribution degrees of displacement and imbibition in different development stages of the oil reservoir are determined according to a data simulation result, and a theoretical basis and technical support are provided for oil reservoir exploitation.

The invention discloses a rapid simulation and layered injection-production real-time optimization method suitable for a complex oil reservoir, and belongs to the field of unconventional oil reservoir numerical simulation, and the method comprises the following steps: 1, constructing a GMM-XGB hybrid model based on a Gaussian mixture model and an XGBoost algorithm; 2, constructing a layered connected network model based on a physical model; step 3, carrying out automatic history fitting by adopting an ES-MDA algorithm; and 4, establishing a layered injection and production real-time optimization objective function mathematical model, and performing layered injection and production real-time optimization based on an SHADE algorithm. According to the method, the recovery efficiency of the complex oil reservoir can be improved, the stable production period of an oil field is prolonged, and efficient utilization of resources and maximization of economic benefits are achieved.

The invention provides a high and low temperature true triaxial fracturing, seepage and microscopic monitoring experiment system and method. The system comprises a three-dimensional model and a reaction kettle module, the triaxial stress loading module is arranged at the bottom and the periphery of the cavity of the three-dimensional model and reaction kettle module; a fracturing module; a temperature control module; and a crack monitoring module. Through internal and external integral temperature control, large-range temperature adjustment and stable control of-15 DEG C to 130 DEG C are realized; monitoring points such as acoustic emission, resistivity and the like are carried to explain and analyze the dynamic change rule of the crack in real time; through the innovative structural design of the device, the functions of kettle body sealing, high-stress-difference triaxial synchronous loading, radial uniform seepage and the like are achieved, the experimental requirements of hydrate in-situ generation and decomposition, large-size rock sample saturation, high-stress-difference fracturing experiments and the like are met, the true-triaxial large-physical-model experimental application scene is expanded, and the experimental efficiency is improved. And technical support is provided for fracturing transformation process optimization, scheme design and the like of unconventional oil and gas resources such as deep shale gas and hydrates.

The invention discloses a deep learning assisted acceleration fracturing construction parameter intelligent real-time optimization method, and belongs to the field of unconventional oil and gas field development, and the method comprises the steps: constructing a structured sample database covering geological attributes, engineering parameters and fracturing effect responses, and carrying out the unified preprocessing of multi-source data; constructing a multi-modal space-time collaborative prediction model, and combining a multi-expansion time permissible convolutional network, a three-dimensional residual network and a cross attention mechanism; supervised learning training is carried out based on a database, sparse regularization and learning rate scheduling are introduced, and the model precision and generalization ability are improved; a hierarchical collaborative optimization framework of outer-layer Bayesian search-inner-layer CMA-ES refinement is provided, and reservoir transformation volume maximization and construction feasibility are achieved under complex constraints; compared with an existing method, optimization parameters of the method include the cluster distance and the section distance and further include the displacement, the sand concentration, the fracturing fluid type and other construction parameters, and real-time optimization of the fracturing construction parameters can be achieved through the machine learning agent model.

The invention discloses a method for transforming a depleted or nearly depleted unconventional oil and gas reservoir into a compressed air energy storage system, which is applied to the technical field of underground energy storage and aims to solve the problem that the existing main compressed air energy storage system is mainly a salt cavern reservoir, but salt caverns capable of being used for compressed air energy storage are insufficient from comprehensive factors. According to the invention, an existing exhausted or nearly exhausted unconventional oil and gas reservoir is transformed as an energy storage place for compressed air. Due to the fact that the exhausted or nearly exhausted unconventional oil gas fracturing well is adopted, the existing fracturing well can be effectively utilized, resource waste is avoided, and economic benefits are increased. Due to the fact that the complex fracture network space formed by fracturing and the pore space, disturbed by fracturing, of the unconventional oil and gas reservoir are utilized, high-pressure gas can be effectively sealed, leakage is reduced, and the pressure maintaining capacity is improved.

The invention relates to the technical field of unconventional oil and gas development, in particular to a system and a method for simulating gas-water alternation multi-turn pressing-braising injection and production oil displacement. According to the scheme, a pressing fracture network and a matrix reservoir are equivalently simulated, and pressing-braising injection and production of well soaking time are reasonably considered, so that the result is more accurate, and the oil displacement efficiency is improved. After the fracture core clamping unit and the matrix core clamping unit are exchanged in the forward direction and the reverse direction, a compact core is rapidly saturated, the oil reservoir initialization time is shortened, the influence of multiple fracture parameters on oil displacement in the three stages of pressing, braising and mining can be considered without repeatedly disassembling and assembling the core clamping unit, the fracture form is changed by replacing the fracture forming core, and the oil displacement efficiency is improved. The influence rule of a water-gas composite medium on the oil well pressing-braising-production capacity under different storage and seepage modes can be researched, the different storage and seepage modes comprise a multi-stage fracture-matrix reservoir, a large fracture-matrix reservoir, a micro-fracture-matrix reservoir and an original matrix reservoir, and independence and integrity of a fracture core and a matrix core are ensured; the experiment time is greatly shortened.

The invention discloses an unconventional oil and gas yield prediction method based on space-time Transform, which is characterized in that geological parameters, fracturing construction parameters and production dynamic data are fused, and time sequence dependency and spatial heterogeneity of modeling parameters are synchronized by utilizing a space-time attention mechanism. Firstly, normalization and space-time alignment are carried out on multi-source data, and a joint input matrix is constructed; then, a dynamic change trend of fracturing construction parameters is extracted through a time attention module, a space contribution weight of geological parameters is quantified through a space attention module, and a space-time interaction matrix is introduced to capture a multi-dimensional coupling relation; and finally, outputting a yield prediction result through feature fusion and MLP. According to the method, the dependence of a traditional model on a single data source is broken through, the precision and interpretability of unconventional oil and gas yield prediction are remarkably improved, and reliable technical support is provided for oil and gas field development strategy optimization.

The invention discloses a CO2-oil near-miscible phase pressure acquisition system and method based on convective mixing, and belongs to the field of CO2 oil displacement. The system comprises a high-temperature and high-pressure reaction kettle, a temperature and pressure control system, a gas injection module, a liquid injection module and a monitoring control module. According to the method, the oil phase and the carbon dioxide are induced to form a convective mixing effect by dynamically regulating and controlling the injection flow rate, and when no interface of the system reaches a mutual convective mass transfer state, the system pressure corresponding to a phase interface disappearance critical point is directly recorded as a near-miscible-phase pressure value. The near-miscible pressure value obtained by the method is high in accuracy, the single test time is shortened to 1 hour, the test period is remarkably shortened, near-miscible pressure parameters under different temperature conditions can be measured in a short time, the CO2-oil near-miscible pressure can be measured by simulating a high-temperature and high-pressure environment of a stratum, and the method is suitable for popularization and application. And high-timeliness key phase state data support is provided for unconventional oil and gas reservoir development.

A short radius drilling tool and a trajectory-controllable lateral drilling tool and method, including a lateral drilling section with high passing ability and a power transmission section, wherein the lateral drilling section with high passing ability can drill the extension well section of a short to ultra-short radius well section that extends laterally from a main wellbore. The designed trajectory-controllable lateral drilling tool allows a wellbore to be subjected to directional drilling with a short to ultra-short radius from a tail end or any position of the original wellbore trajectory, and then implements lateral extension drilling. Furthermore, the device has engineering feasibility and practical value for thin reservoir exploitation, remaining oil potential tapping, exploitation of horizontal wells in sub-salt reservoirs, combined exploitation of thin interbed, coalbed methane exploitation, underground gasification exploitation of coal mine, unconventional oil and gas exploitation, (seabed) shallow horizontal well drilling, and exploitation of other minerals.

The invention relates to the technical field of fracturing sliding sleeve systems, in particular to an intelligent fracturing sliding sleeve system with a precise fracture forming function and an implementation method. Each stage of intelligent fracturing sliding sleeve capable of being opened and closed is opened for the first time, when the implementation mode of independently opening or closing any stage of intelligent fracturing sliding sleeve or when a multi-layer-section sliding sleeve needs to be opened or closed in the production process, different intelligent labels and matched tools are adopted, and unlimited-stage, more efficient and accurate fracturing fracture forming of an unconventional oil and gas well can be achieved; therefore, the exploitation effect of the oil-gas well is optimized. Meanwhile, water plugging-free operation of a production layer in the later period of production is achieved, and repeatable opening and closing control of the production layer is achieved under the conditions that the inner drift diameter of the well completion pipe string is not changed and production liquid is not produced for throttling through a switchable intelligent fracturing sliding sleeve preset in the well completion pipe string and a continuous oil pipe is used for carrying a switching tool; and the regulation and control flexibility of oil and gas storage from the initial development to the later oil stabilizing and water controlling stage is greatly improved.

The invention provides a calibration method for a nuclear magnetic fluid signal conversion relation with shale as a carrier and application, and belongs to the technical field of unconventional oil-gas exploration and development. The method comprises the steps that shale samples are pretreated, and fluid saturation is conducted on the shale samples; the saturated shale is subjected to centrifugation and drying treatment, and T2 spectrogram testing is carried out by adopting nuclear magnetic resonance equipment in different treatment stages; and the conversion relation of the oil-water fluid in the shale is established by comparing the attenuation amount of the fluid in the shale pores at different stages with the T2 spectrogram signal difference value. The mass change caused by fluid loss in the closed coring shale is used as the verification basis of the conversion relation, and the reliability of the method is ensured. And then crude oil with different maturity degrees and formation water fluids with different mineralization degrees are adopted to repeat the operation, the calibration conversion relation of the crude oil with different maturity degrees and the formation water with different mineralization degrees is obtained, then the change rule of the calibration conversion relation is disclosed, and the accuracy and scientificity of the nuclear magnetic resonance technology in the aspect of shale fluid evaluation are improved.

The invention discloses a shale oil geological sweet spot prediction method based on multiple parameters, and belongs to the field of unconventional oil and gas development, and the method comprises the steps: obtaining well logging data of a known well, carrying out the preprocessing of the well logging data, and obtaining the preprocessed well logging data; constructing a deep neural network model, inputting the preprocessed logging data into the model for training, and obtaining a trained deep network; applying the trained deep network to a target well based on a transfer learning method to generate a transfer model; obtaining target well data, inputting the target well data into the migration model for prediction, and obtaining related parameters; constructing a geological dessert factor model by using related parameters; geological sweet spot factors are obtained based on the geological sweet spot factor model, and shale oil geological sweet spots are divided into different grades based on the values of the geological sweet spot factors. According to the method, dependence on a large amount of logging data is reduced, prediction precision is improved, and technical support is provided for effective development of unconventional oil and gas resources.

The invention relates to an infinite intelligent regulation and control fracturing sliding sleeve which is particularly suitable for development of unconventional oil and gas resources such as shale gas and tight oil. The concrete structure of the infinite intelligent regulation and control fracturing sliding sleeve dart part comprises an outer shell, a lower baffle disc, an upper baffle disc, a bolt, a spring, a clamping ring, a blocking ball, a thrust block, a thrust bearing, a flow dividing block, a motor, a flow divider, a capacitive sensor, a silicon rubber sealing piece, a control module and a flow divider end cover. When the infinite intelligent control fracturing sliding sleeve dart part passes through a designated position, the infinite intelligent control fracturing sliding sleeve dart part judges and counts each part needing to be fractured through the three capacitive sensors, when a preset value is reached, the tool is switched to an activated state, the blocking ball is impacted under the pressure of drilling fluid, and the part needing to be fractured is fractured. The thrust block is pushed, the thrust block opens the piston on the casing pipe under the pressure building effect, and fracturing operation is achieved. And the limitation of the size of a steel ball in the traditional ball throwing type sliding sleeve technology is avoided, the operation complexity is reduced, the construction efficiency is improved, and a new technical means is provided for efficient development of unconventional oil gas.

The invention discloses a three-dimensional fine geological modeling method for conventional and unconventional oil and gas reservoirs, which comprises the following steps of: firstly, performing multi-source data integrated management: integrating heterogeneous data such as drilling data (lithology and logging curves), a geological profile map, seismic exploration data (seismic waves and induced polarization), construction dynamic data (tunnel face sketches and laser point clouds) and the like; unified storage and dynamic calling are realized; by integrating multi-source data of earthquake, logging, geochemistry and the like, a high-precision three-dimensional model is established, such as a drilling data regularization processing algorithm and a point cloud hole filling algorithm, the problems of inconsistent data formats and space missing are effectively solved, and the geometric precision and topological integrity of the model are improved. Therefore, the problems of difficulty in multi-source heterogeneous data fusion and insufficient model precision in existing oil and gas reservoir three-dimensional geological modeling are solved; through the multi-dimensional data fusion and intelligent modeling technology, the precision of the three-dimensional geologic model of conventional and unconventional oil and gas reservoir development is improved.

The invention relates to the technical field of exploration and development of unconventional oil and gas reservoirs, in particular to an experimental device and method for quantitatively evaluating CO2-hydrocarbon-water interaction mixing and dissolving capacity of a water-containing gas reservoir. The experimental device comprises a vacuum pump, a constant-temperature air bath box, a sample preparation unit, an injection unit, a testing unit and a metering unit. The method comprises the following steps: injecting excessive pure CH4 into a sample preparation unit at a constant pressure, enabling a two-phase system of the pure CH4 and formation water to reach hydrocarbon-water phase balance, transferring the formation water of saturated hydrocarbon into a visual phase tester, injecting CO2 into the visual phase tester at a constant pressure, fully stirring fluid, standing for a period of time, carrying out ion chromatography analysis, and determining the content of CO2 in the formation water. According to the experimental device, the proportion of CO2 and the proportion of CH4 in undissolved gas are determined, an experiment is carried out through the experimental device, a CO2-hydrocarbon-water interaction miscibility theory system in the whole CO2 injection and burying process of the gas reservoir with water can be perfected, and the problem that the miscibility of CO2-CH4 in the CO2-hydrocarbon-water system under the high-temperature and high-pressure conditions is difficult to effectively and quantitatively evaluate is effectively solved.

The invention discloses a shale oil reservoir nano agent displacement injection pressure prediction method and device, and belongs to the technical field of oil reservoir development. The injection pressure is predicted according to a starting pressure gradient method, the injection pressure is predicted according to a production quantity equivalent method formula and an improved starting pressure gradient experimental device, mutual verification is carried out, and an important basis is provided for shale oil continuous displacement development feasibility. According to the method, in shale oil and shale oil sustainable development mode optimization, the injection pressure serving as a key factor of displacement feasibility is predicted, oil reservoir energy is supplemented through nano-agent displacement, the oil displacement efficiency and the recovery efficiency of unconventional oil reservoirs such as shale oil and shale oil are improved, and if the predicted injection pressure can be achieved on site, the prediction of the injection pressure can be achieved on site. The method is of great significance to determination of economic recoverable reserves of unconventional oil reservoirs, determination of sweet spot areas, improvement of single well EUR and improvement of oil reservoir recovery efficiency.

The invention provides a shale oil pyrolysis adsorption oil and free oil correction method based on a nuclear magnetic experiment, and belongs to the field of exploration and development of unconventional oil and gas fields. According to the method, on the basis of a shale rock physical experiment and a shale nuclear magnetic resonance experiment, the occurrence space and content of adsorbed oil are determined by using multi-state nuclear magnetic resonance experiments such as original sample, saturated oil, washing oil and different temperatures, so that a nuclear magnetic adsorbed oil model is constructed, and the content of the adsorbed oil is determined by further combining a different-temperature-order parallel crushed sample lithologic pyrolysis experiment-nuclear magnetic combined measurement experiment. The content of the free oil and the content of the adsorbed oil are calculated through the two-dimensional nuclear magnetism T1-T2 spectrum semaphore, the content of the free oil and the content of the adsorbed oil are compared and analyzed, the difference between the nuclear magnetism adsorbed oil and the pyrolysis adsorbed oil is matched with a free hydrocarbon curve to achieve adsorbed oil correction, and the free oil and the adsorbed oil are obtained.

The invention discloses a horizontal well fracturing perforation parameter optimization method and device considering non-uniform crustal stress and a medium, and relates to the field of unconventional oil and gas reservoir yield increase renovation. The method comprises the steps that a three-dimensional non-uniform crustal stress field of reservoir fracturing is constructed; the method comprises the following steps of: performing grid division on a hydraulic fracture by using a fracture unit, acting a three-dimensional non-uniform ground stress field on a divided grid, and establishing a constitutive model of reservoir rock deformation and stress in a hydraulic fracturing process; according to the constitutive model, establishing a flow model of the fracturing fluid in the horizontal shaft, the perforation hole and the hydraulic fracture; establishing an expansion criterion of the hydraulic fracture in the fracture length and fracture height directions; according to the expansion criterion and the flow model, the expansion results of the horizontal well fracturing cracks under different perforation parameters are simulated; and the horizontal well fracturing perforation parameters are optimized according to the expansion result. According to the method, the defects of a uniform crustal stress field assumption and a plane crack propagation assumption in the prior art are overcome, and the optimization of the horizontal well fracturing perforation parameters in the non-uniform crustal stress field is realized.

A method for controlling a fracture height in unconventional oil and gas reservoirs under multi-bedding interference is provided. The method includes: obtaining geological parameters of a target horizontal well, and determining a fracturing fluid and construction parameters based on a production capacity target of the target horizontal well; determining a hydraulic fracturing process of the target horizontal well based on a hydraulic fracturing model for processing the multi-bedding interference, and evaluating the fracture height; comparing the fracture height with an expected control height, if the fracture height is greater than the expected control height, reducing a displacement of the fracturing fluid or a total time of a hydraulic fracturing to update the construction parameters until the fracture height is less than the expected control height; and performing the hydraulic fracturing on the target horizontal well based on updated construction parameters.

The invention relates to the technical field of unconventional oil and gas well fracturing tools, in particular to an energy-gathered fracturing tool which comprises an outer cylinder, an energy charging pipe, a gas storage tank, a telescopic sealing assembly and a switching assembly, the energy charging pipe is fixedly installed on the inner side of the upper end of the outer cylinder, and the gas storage tank is sleeved with the position, corresponding to the lower portion of the energy charging pipe, of the outer cylinder; a closed air inlet cavity and a closed air storage cavity are formed in the air storage tank in an up-down spaced mode. According to the energy-gathered fracturing tool, repeated energy charging and fracturing can be achieved, the tool does not need to be lifted to a wellhead for energy charging, energy charging of supercritical carbon dioxide can be completed underground, the operation time is saved, the efficiency is improved, the energy-gathered fracturing tool is provided with the telescopic sealing assembly, the space isolation function is achieved, a packer does not need to be put down, and the cost is reduced. The energy-gathering fracturing tool is ingenious in structure, the gas storage cavity can be expanded through transformation, even if underground energy charging cannot be achieved under the well site condition, multiple times of fracturing can be achieved through one-time energy charging, the lifting frequency is reduced, and the cost is effectively reduced.

The invention relates to a continental facies shale reservoir compressibility evaluation method and system, and belongs to the field of unconventional oil and gas exploration and development. The evaluation method comprises the steps of obtaining a compressibility index of a to-be-evaluated well based on a calculation model of compressibility of a continental facies shale reservoir and plane fracture network parameters, crossing expansion parameters and equilibrium expansion parameters of the to-be-evaluated well; and based on the compressibility index of the well to be evaluated, completing the compressibility evaluation of the continental facies shale reservoir. The plane fracture network parameters comprise natural fracture density, horizontal stress difference and mechanical brittleness index Young modulus. According to the method, the defect that the compressibility of the continental facies shale reservoir is difficult to accurately characterize due to the fact that an existing compressibility evaluation model only takes the complexity degree of a hydraulic fracture network as an evaluation standard is overcome. The evaluation method is reliable in principle, high in operability, high in accuracy and good in engineering application and popularization value.

The invention relates to an unconventional oil reservoir volume fractured horizontal well yield prediction method and device and a storage medium. The method comprises the steps that horizontal well parameters of a horizontal well to be predicted are obtained; obtaining the peripheral vertical well yield of the horizontal well to be predicted; constructing a horizontal well after-pressure yield prediction formula of the horizontal well to be predicted; determining an undetermined coefficient of the horizontal well after-pressure yield prediction formula; and calculating the yield of the horizontal well to be predicted. According to the method, the actual mine field data regression analysis method is adopted to calculate the horizontal well yield after volume fracturing, the influence of the oil and gas enrichment degree and the fracturing transformation degree on the yield increasing effect is considered, meanwhile, by introducing the peripheral vertical well yield, the difference of the yield increasing effects of different blocks and different parts is reduced, and the yield increasing efficiency is improved. Practice proves that the calculation method has certain accuracy; the method has high operability and is well applied to exploration and development practice of low-grade oil reservoirs.

The invention relates to the technical field of oil and gas field development engineering, in particular to an unconventional oil and gas reservoir fracturing flexible material assisted sand carrying-sand control whole process numerical simulation method which comprises the following steps: 1) acquiring a basic parameter data set; 2) respectively establishing corresponding liquid phase-solid phase interaction force models for the proppant and the flexible material; and 3) establishing a numerical model according to the liquid phase-solid phase interaction force model of the proppant and the flexible material, and simulating the whole process of flexible material-proppant cluster conveying, laying and backflow. Through the numerical simulation method provided by the invention, the change conditions of the flexible material-proppant cluster laying form, such as a visual cloud picture, an effective laying area, a particle average flow velocity change curve, flow conductivity and fracture permeability, under different working condition parameters can be simulated; therefore, objective evaluation of the efficient laying effect and the flow conductivity of the fracturing propping agent assisted by the flexible material is realized, and suggestions are provided for site construction parameter optimization.

The invention discloses a reservoir fracture distribution prediction method and system based on big data, and relates to the technical field of oil and gas field development, and the method comprises the steps of multi-source data collection and fusion, multi-scale feature extraction and optimization, hybrid model construction and three-dimensional fracture probability body generation, and fracture distribution prediction and visual display. According to the method, prediction blind areas are reduced by collecting multi-source heterogeneous data, physical constraints are achieved by introducing a Griffith criterion so as to enhance geological rationality, dynamic data and static geological data of fracturing construction are subjected to combined modeling, dynamic fusion of multi-source data is achieved, timeliness of crack prediction is improved, in addition, the physical constraint hybrid model is adopted, and the prediction efficiency is improved. And spatial characteristics and dynamic response are considered through a CNN-GBDT hybrid architecture, a fracture mechanics criterion is embedded to enhance interpretability, real-time access of logging-while-drilling data in the drilling process is supported, and key technical support can be provided for unconventional oil and gas development.

The invention discloses a method for predicting the adsorption property of gas in shale through an improved E-L-F model, and relates to the technical field of unconventional oil and gas development and carbon dioxide geological sequestration, and the method comprises the steps: providing an L-F improved adsorption model based on an L-F adsorption model in combination with a Langmuir + k isothermal adsorption model; based on the L-F improved adsorption model, an improved E-L-F adsorption model is provided in combination with an E-L adsorption model; and the precision of the improved E-L-F adsorption model is verified through experimental data fitting. According to the method, by fusing the Langmuir theory, the Freundlich theory and the Extended-Langmuir theory, an adsorbent heterogeneity parameter n, a high-pressure empirical parameter k and a parameter eta i representing the proportion of adsorption gas to adsorption sites are introduced, the surface characteristics and the high-pressure effect of an adsorption layer are effectively corrected, and the prediction precision of the adsorption amount of CH4 and CO2 in shale is remarkably improved. Experiments show that the average absolute relative deviation of the model in a single-component system and a mixed gas system is lower than 2.3%, and the model is suitable for optimal design of a CO2 enhanced shale gas exploitation technology and CO2 safety storage assessment.

The invention provides a pump stop pressure drop crack evaluation method, medium and equipment, and relates to the technical field of unconventional oil and gas development, and the method comprises the steps: building a crack network model based on ground stress, natural crack distribution and fracturing construction parameters, calculating crack fracture and expansion, and obtaining a crack network form; establishing a shaft-fracture water hammer model according to the fracture network form, and performing discrete solution on the water hammer model by using a characteristic line method; acquiring a simulated water attack effect curve based on the solved water attack model; comparing the simulated water attack effect curve with the actual wellhead pumping stop pressure drop curve, and adjusting the fracture network model and the water attack model until the error is not greater than a set threshold value; introducing a seam length index and a branch index, and establishing a two-parameter evaluation chart based on the geometric morphology of the seam net; and introducing a boundary index and an attenuation coefficient, establishing a two-parameter evaluation chart based on the water attack effect, and calculating four evaluation parameters to obtain a crack evaluation result. According to the method, the pump stop water attack phenomenon under the complex seam network condition can be effectively diagnosed.

The invention discloses a fracturing fluid spontaneous imbibition numerical simulation method considering chemical osmotic pressure, and belongs to the technical field of unconventional oil-gas exploration and development, and the fracturing fluid spontaneous imbibition numerical simulation method comprises the following steps: step 1, describing mathematical problems in a fracturing fluid spontaneous imbibition phenomenon, and carrying out mathematical model assumption; 2, determining the real speed of the water phase based on the seepage speed of the water phase; 3, determining a salt ion migration control equation under an oil-water two-phase flow condition; 4, based on the oil-water two-phase flow control equation considering the chemical osmotic pressure and the salt ion migration control equation under the oil-water two-phase flow condition, establishing a fracturing fluid spontaneous imbibition mathematical model considering the chemical osmotic pressure; 5, spatial discretization is conducted on the fracturing fluid spontaneous imbibition mathematical model; and step 6, determining spontaneous imbibition numerical simulation parameters, and performing numerical method solution on the fracturing fluid spontaneous imbibition mathematical model. According to the method, the accuracy of spontaneous imbibition numerical simulation of the fracturing fluid can be effectively improved.