1259 results about "Horizontal wells" 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 combined well spacing method for a ground vertical well and an underground horizontal well, which comprises the following steps of: determining estimated fracturing information of the vertical well and estimated fracturing information of the horizontal well according to acquired fracturing construction information of a surrounding mine; the width of the to-be-mined working face and the lateral mining-induced fracture range of the mined working face are obtained, vertical well construction information is determined according to the width of the to-be-mined working face, the lateral mining-induced fracture range and vertical well estimated fracturing information, fracturing construction is conducted on the thick and hard roof based on the vertical well construction information, and the vertical well fracturing range of a ground vertical well is obtained; and horizontal well construction information is determined according to the horizontal well estimated fracturing information and the vertical well fracturing range, and fracturing construction is conducted on the impact main control rock stratum based on the horizontal well construction information. According to the combined well spacing method for the ground vertical well and the underground horizontal well, the well spacing scheme that the ground vertical well and the underground horizontal well are matched with each other is adopted, sufficient fracturing and pressure relief can be conducted on a thick and hard top plate, and cooperative prevention and control over rock burst and mine earthquake disasters are achieved.

The invention provides a stratified reservoir lamination fracture high-crossing evaluation method and device, and relates to the technical field of oil-gas exploration, and the method comprises the steps: carrying out the combined analysis of a geomechanical model based on a target position of a research area, a first fracture propagation analysis result and a second fracture propagation analysis result, and obtaining a first fracture propagation analysis result and a second fracture propagation analysis result; determining conditions of crack induced bedding opening and crossing expansion under different reservoir and interlayer stress differences and interlayer thicknesses, and drawing a crack height crossing evaluation chart corresponding to the target position by taking the reservoir and interlayer stress differences and the interlayer thicknesses as two-dimensional coordinate axes; and performing layer crossing evaluation before fracturing construction of the to-be-built production block by using the seam height layer crossing evaluation chart. According to the method, the fracture height crossing evaluation chart is determined by combining the formation mechanical characterization, the fracture propagation physical simulation experiment and the multi-cluster fracturing fracture propagation numerical simulation experiment in the horizontal well, then the crossing evaluation of the to-be-built production block is carried out, and the post-fracturing production capacity, the overall production effect of the reservoir and the overall development benefit of the stratified reservoir are improved.

The invention belongs to the technical field of petroleum and natural gas engineering, and particularly relates to a priori knowledge embedded unsupervised learning geology-engineering dessert comprehensive evaluation method, which comprises the following steps: S1, obtaining an evaluation data set of a research area, and preprocessing and standardizing the evaluation data set; s2, dividing the evaluation data set into a positive index and a negative index according to the prior knowledge, constructing positive and negative ideal points through the prior knowledge, and fusing to generate an unsupervised evaluation data set; s3, clustering is carried out on the unsupervised evaluation data set by adopting principal component analysis and an incremental online k-means algorithm; and S4, according to category labels obtained by clustering, determining geological-engineering dessert grades by adopting a standardized variable distance grading evaluation method, and carrying out segmented clustering optimization and perforation position optimization on the geological-engineering dessert grades. According to the method, a supervised evaluation effect is achieved through an unsupervised algorithm, comprehensive evaluation of the dessert of the fractured horizontal well section is achieved, and the problem of unlabeled data evaluation is effectively solved.

The invention discloses a quantitative evaluation method for complexity of shale oil and gas horizontal well reservoir reconstruction cracks, which comprises the following steps: determining a crack development strength factor representing reservoir inherent crack development potential by calculating a mineral heterogeneous coefficient based on rock sample mineral component data at each perforation cluster position in a target fracturing section; determining the optimal fracture length by combining reservoir numerical simulation, determining the total fracturing fluid amount, performing non-uniform distribution according to the heterogeneity of each cluster, and determining a fracture propagation complexity factor representing the dynamic propagation complexity of the hydraulic fracture; weighting the two factors to obtain a crack complexity index for comprehensively evaluating the reservoir transformation effect, and performing grading; according to the method, static geological evaluation and dynamic engineering evaluation are combined, quantification of inter-cluster transformation differences is achieved, the defects that a traditional method is one-sided in evaluation and low in precision are overcome, and a reliable quantitative basis is provided for optimal design of a shale oil and gas reservoir fracturing scheme and accurate evaluation of the transformation effect.

The present application relates to the technical field of shale oil and gas field development, and is a test system for simulating fault activation and induced earthquake under the action of horizontal well hydraulic fracturing, which comprises a horizontal well geological model, a distributed optical fiber monitoring system, a perforating system, a fracturing system, a formation temperature simulation system and a stress applying system. The present application has a reasonable and compact structure and is convenient to use. It can realize the application of true triaxial formation pressure, simulate the real formation temperature of the formation where the horizontal well is located, and continuously and real-timely monitor the multi-physical field of the fault-containing geological reservoir under the conditions of formation pressure, temperature, the whole process of horizontal well hydraulic fracturing and multi-step conditions. Therefore, the mechanism of hydraulic fracturing activating faults, the feature difference of multi-stage fracturing fracture network, the deformation of casing and the risk of induced earthquake can be quantitatively characterized and regularly analyzed, so as to study the formation and expansion of rock mass fracturing fracture network, the activation of faults and the deformation and damage process of wellbore casing during the whole process of fracturing at different stages of horizontal well.

The invention provides a hydraulic jet staged fracturing tool for a horizontal well, and belongs to the technical field of horizontal well fracturing tools. The multiple spraying assemblies are arranged on the peripheral wall of the oil pipe, and the spraying assemblies can be adjusted at any rotation angle around the peripheral wall of the oil pipe; a plurality of packers are fixed to the peripheral wall of the oil pipe, a hydraulic motor is fixed to the right end of the oil pipe, a rubber scraping disc is fixed to an output shaft of the hydraulic motor, and a crushing assembly is arranged on the rubber scraping disc. The device has the advantages of being capable of achieving large-scale perforation operation through a small number of jet holes and the like, and the problem that in the prior art, a device is inconvenient to conduct large-scale perforation operation is solved.

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 field of oil and gas reservoir drilling, and provides a borehole wall stability analysis method for a deepwater shallow long horizontal well, which comprises the following steps: carrying out mechanical parameter test on a weakly cemented rock sample to obtain basic mechanical characteristic parameters; performing time-varying strength modeling on the weak cementation constitutive structure to obtain a damage evolution model; performing three-dimensional finite element modeling on the stratum around the borehole to obtain a numerical calculation model; establishing a control equation set, and discretely solving the control equation set through the numerical calculation model to obtain a field variable solving result; and well wall stability analysis is carried out based on the field variable solving result, and an analysis result is obtained. According to the method, the well wall stability prediction precision of the deep-water shallow-layer long horizontal well is improved, and the safety of well drilling is improved.

The invention provides a heavy oil thermal-flow coupling development experimental device and method based on microwave-assisted gravity drainage, and belongs to the field of oil-gas field development. The experimental device comprises a three-dimensional oil reservoir simulation system, a microwave-assisted heating system, a horizontal well injection-production regulation and control system and a multi-field monitoring system; the microwave auxiliary heating system comprises a microwave generation regulation and control system, a microwave transmission system and a shaft integrated microwave radiator, the microwave generation regulation and control system comprises an industrial grade microwave generator, a power regulator and a PLC, and the microwave transmission system comprises a microwave coaxial cable and a microwave waveguide tube bundle; and the microwave generator is continuously connected with the microwave waveguide tube bundle and the shaft integrated microwave radiator. According to the heavy oil thermal-flow coupling development experimental device and method based on microwave-assisted gravity oil drainage, the technical problems that an existing deep heavy oil thermal recovery experimental device cannot reproduce a'thermal-flow-force 'multi-field coupling environment, the microwave heating adaptability is poor, and the experimental scale and the field deviation is large are solved. The heavy oil thermal-flow coupling development experimental device and method based on microwave-assisted gravity oil drainage solve the technical problems that an existing deep heavy oil thermal recovery experimental device cannot reproduce the'thermal-flow-force' multi-field coupling environment.

The invention provides a productivity evaluation method for a tight gas reservoir horizontal well, and relates to the technical field of tight gas reservoirs, and the method comprises the following steps: obtaining well logging sensitive parameters and rock mechanical parameters of the tight gas reservoir horizontal well; based on the logging sensitive parameters and a comprehensive index model, comprehensive indexes corresponding to different reservoirs in the horizontal well are calculated; based on the comprehensive index, the logging sensitive parameter and the rock mechanical parameter, determining a geological dessert level and an engineering dessert level corresponding to the reservoir; and carrying out productivity evaluation on the horizontal well based on the geological dessert level and the engineering dessert level corresponding to the reservoir. Therefore, the geological sweet spots can be accurately identified based on different data dimensions through the comprehensive indexes determined by the logging sensitive parameters having great influence on lithology and the logging sensitive parameters, collaborative evaluation is performed through the geological sweet spots and the engineering sweet spots, the reservoir capacity and the transformation capacity of the reservoir capacity are considered at the same time, and the accuracy of capacity prediction is remarkably improved.

The invention provides a construction method of a horizontal well reservoir interpretation model, and relates to the technical field of shale oil-gas field development, and the construction method comprises the following steps: obtaining a target oil testing result and a target parameter corresponding to a fractured section of a target horizontal well; performing correlation analysis on the target parameters according to the target oil testing result, and determining sensitive parameters sensitive to oil-water characteristics in the target parameters; constructing a target relation model according to the sensitive parameters; and establishing a comprehensive interpretation model for interpreting the reservoir type of the horizontal well. According to the method, the target relation model for calculating the lithology index, the oiliness index and the pore structure index is established, and the comprehensive interpretation model for interpreting the reservoir type of the horizontal well through the three indexes is established, so that the characteristics of multiple aspects such as lithology, oiliness and pore structure of the reservoir can be more comprehensively reflected; therefore, the precision of reservoir type interpretation is improved, and accurate data support can be provided for horizontal well fracturing staged clustering.

The present application relates to a kind of fracturing perforation position selection method, belong to a kind of coalbed gas horizontal well development technical field, specifically relates to a kind of coal seam roof horizontal well fracturing perforation position selection method.The present application provides new method and train of thought for the optimal perforation position of coal seam roof horizontal well, can reduce the problem of pump pressure being too high, sanding difficulty in reservoir reconstruction process, improve the reconstruction efficiency of coal seam.

The invention discloses a method for controlling rock burst through staged fracturing of a coal mine ground horizontal well. The method comprises the steps that 1, the applicability of controlling the rock burst through staged fracturing of the ground horizontal well is judged; 2, calculating a fracturing anti-impact efficiency index, and obtaining the position of an optimal fracturing target rock stratum; 3, fracturing construction parameters are calculated theoretically; 4, pressure test experiment inspection is conducted, the fracturing construction parameters obtained in the step 3 are optimized, a pump injection pressure-displacement curve of the fractured target rock stratum is obtained, and the displacement under the minimum pump injection pressure is determined through fitting calculation; 5, a numerical model is constructed according to the coal seam and stratum structure, different fracturing parameters are set, a fracturing numerical simulation test is conducted on the target fracturing horizon, and the optimal total liquid quantity parameters corresponding to different fracturing degrees and meeting the expected rock burst prevention and control requirement are obtained; and 6, drilling well fracturing construction is conducted according to the determined fracturing construction parameters. The method is particularly suitable for pressure relief and scour prevention by adopting an L-shaped horizontal well to carry out staged fracturing on a thick and hard roof target rock stratum on the ground.

The invention relates to a method for treating shale oil crack wall surfaces by using carbon nanotubes to increase the heat transfer capacity of a reservoir, a plurality of horizontal wells are drilled from the ground, the horizontal sections of the horizontal wells form three parallel well rows, the uppermost well row and the lowermost well row are heating wells, and the middle well row is a production well. The fracturing fluid carrying the proppant is injected into the heating well and the production well with the displacement greatly exceeding the stratum absorption capacity, the bottom hole pressure is larger than the stratum fracture pressure, hydraulic fracturing is carried out, a tensional fracture area and a communication well group are generated, and meanwhile it is guaranteed that fractures are not closed after the proppant is filled. Under the condition that the pressure is lower than the formation fracture pressure, a weak acid solution is slowly squeezed into the heating well and the production well, the well wall and the crack wall face are treated, and a large number of corrosion micropores are formed. And under the condition that the pressure is lower than the stratum fracture pressure, a weak acid solution added with the carbon nano tubes is squeezed into the heating well and the production well, so that the carbon nano tubes are adsorbed or filled in the corrosion micropores, and the micropores where the carbon nano tubes are attached are formed. And high-temperature steam is circularly introduced into the heating well and the production well to heat the oil shale stratum. After heating for a certain time, stopping steam injection of the production well, and changing into production; and continuously injecting steam into the heating well. The method is suitable for an oil shale underground in-situ conversion exploitation technology, and is also suitable for geothermal exploitation and heavy oil thermal exploitation.

The embodiment of the invention provides a fracturing staged clustering method and device for a horizontal well. The method comprises the steps that well periphery natural fracture distribution data and well logging interpretation data of a target horizontal well are obtained; according to the well periphery natural fracture distribution data and the well logging interpretation data, performing preliminary segmentation on a well periphery reservoir of the target horizontal well to obtain different types of reservoirs; horizontal well clustering fracturing crack propagation models are constructed for the different types of reservoirs respectively; performing fracture propagation simulation according to the horizontal well clustering fracturing fracture propagation model to obtain a fracturing fracture form; determining single-section perforation cluster parameters of different types of reservoirs according to the fracturing fracture form; and according to the single-section perforation cluster parameters and the well logging interpretation data, the specific section position and the perforation cluster position of the target horizontal well are determined. According to the method, the unconventional oil and gas reservoir fracturing transformation effect can be improved.

The invention relates to the technical field of productivity evaluation, in particular to a thickened oil polymer flooding reservoir horizontal well productivity evaluation method and system.The method comprises the following steps that injection volume and daily fluid production data are collected to construct a sequence, rate transition and fluid volume inflection point judgment response starting are recognized, the fluid volume rising trend is analyzed to recognize a growth section, and the productivity of a horizontal well is evaluated. Dividing sub-intervals, evaluating fluctuation to determine an oil production stable section, and determining response association by combining concentration and a ratio to obtain a productivity section distribution interval. According to the method, the time sequence is constructed by collecting the daily injection volume, the rate transition is recognized, the production liquid increasing inflection point is extracted, the response starting moment is measured, the state of the horizontal well is recognized more accurately, based on the daily production liquid change comparison before and after starting, the daily oil production fluctuation in the lagging stage is evaluated, the stable oil production stage is screened, and the effective time of evaluation focusing is ensured. And a continuous descending starting point is delimited by comparing periodic oil production change, and the injection state is analyzed by combining the injection concentration and the liquid production ratio, so that productivity response staged identification is realized, and a basis is provided for adjustment.

The invention provides a tight sandstone reservoir horizontal well three-dimensional comprehensive compressibility evaluation method and device, and belongs to the technical field of oil-gas exploration. The method comprises the following steps: performing three-dimensional modeling on geological attributes around a target horizontal well, wherein the geological attributes comprise lithology, natural fractures and oil-gas possibility; carrying out geological attribute assignment; fracturing crack propagation simulation is conducted on the penetrating interval of the target horizontal well trajectory; according to different fracture height sweep degrees of fractured fractures, establishing a mapping coefficient, and according to the mapping coefficient, mapping a geological attribute assignment result to the horizontal well to obtain a geological sweet spot index around the horizontal well; and obtaining a comprehensive compressibility evaluation result according to the evaluation parameters including the geological sweet spot indexes around the well. According to the method, lithology, natural fractures and oil-gas possibility in geological dessert attributes around a well are comprehensively considered and mapped into geological dessert indexes around the well, and then the geological dessert indexes around the well are combined with other geological, engineering and technological parameters, so that compressibility evaluation of the compact sandstone reservoir is realized.

The invention discloses a displacement potential energy gradient oriented injection-production reconstruction optimization method between fracturing segments, and relates to the technical field of oil and gas field development. The method comprises the following steps: firstly, establishing an oil reservoir three-dimensional numerical model according to oil reservoir interpretation data, simulating in an oil reservoir numerical simulator by using the oil reservoir three-dimensional numerical model to obtain a global pressure field and a fluid flow velocity change condition in the oil reservoir, constructing a fluid potential field model, and determining potential energy gradients among injection-production units; constructing an objective function and setting constraint conditions by taking the most balanced potential energy gradient distribution among all injection and production units in the fluid potential field model as an optimization objective, solving the objective function based on a particle swarm algorithm, and optimizing the horizontal well multi-stage fracturing inter-section injection and production scheme to obtain the optimal horizontal well multi-stage fracturing inter-section injection and production scheme. The control device is used for controlling the injection-production process device between the multistage seam sections of the horizontal well, quantitative characterization and active control of an oil reservoir fluid potential field are achieved, and a basis is provided for improving the injected fluid sweep volume and the crude oil recovery rate of an oil reservoir.

The embodiment of the invention provides a method and device for obtaining the stratum penetrating position of a well track of a continental facies shale horizontal well. The method comprises the steps that geological parameters and engineering parameters of all small stratums of continental facies shale are obtained; hydraulic fracturing fracture morphological parameters are determined according to the geological parameters, the engineering parameters and the hydraulic fracturing process parameters; according to the hydraulic fracturing fracture morphological parameters, the propping agent stacking height of the continental facies shale under different horizontal well track layer penetrating positions is determined, and the supporting condition in the fracture height direction is evaluated according to the propping agent stacking height; and according to the hydraulic fracturing fracture morphological parameters and the supporting condition in the fracture height direction, the final horizontal well hole track layer penetrating position is determined. By means of the method, the high-quality borehole crossing position can be obtained and used for guiding drilling design and development of the continental facies shale horizontal well.

The invention discloses a horizontal well while-drilling method and system suitable for ultra-deep oil and gas reservoir development, and belongs to the technical field of oil exploration and development. (2) accurate target entering is guaranteed through a marker bed control method and a stable inclination top detection method; and 3) predicting the position of the drill bit after target entering to guide the adjustment of the horizontal well. The horizontal well track is adjusted in real time by measuring stratigraphic layering and well deviation data during drilling, the drilling rate of a reservoir can be effectively increased, and an effective technical means can be provided for efficient development of deep oil and gas reservoirs.

The invention discloses a ground vertical shaft and underground horizontal well combined well spacing method which comprises the following steps: determining vertical shaft estimated fracturing information and horizontal well estimated fracturing information according to acquired fracturing construction information of surrounding mines; the width of the to-be-mined working face and the lateral mining-induced fracture range of the mined working face are obtained, vertical shaft construction information is determined according to the width of the to-be-mined working face, the lateral mining-induced fracture range and the vertical shaft estimated fracturing information, fracturing construction is conducted on the thick and hard roof based on the vertical shaft construction information, and the vertical shaft fracturing range is obtained; horizontal well construction information is determined according to the horizontal well estimated fracturing information and the vertical well fracturing range, and fracturing construction is conducted on the impact main control rock stratum based on the horizontal well construction information; the plurality of ground vertical shafts are divided into at least two vertical shaft groups which are arranged at intervals along the inclined direction of a to-be-mined working face; according to the combined well spacing method provided by the embodiment of the invention, all-directional fracturing pressure relief can be carried out on the thick and hard top plate of the super-long working face, and cooperative prevention and control on rock burst and mine earthquake disasters are realized.

The invention discloses a coal seam gas enhanced mining method based on methane in-situ burning explosion fracturing. A top plate horizontal well and a bottom plate horizontal well are drilled in a top plate and a bottom plate correspondingly; the sand-carrying fluid forms high-speed and high-pressure jet flow through a perforating device and impacts a bottom plate, holes are formed in the coal seam, and meanwhile a plurality of cracks are generated in the surfaces of the holes; a plurality of fishbone wells are drilled downwards in the horizontal well section of each roof horizontal well; fracturing operation is conducted on the holes through liquid CO2; coal ash and oxygen are injected into the horizontal well section of the bottom plate horizontal well together, and a mixture is formed; detonating the mixture, and generating impact on the coal seam by utilizing instantaneous high pressure generated by burning explosion, so that the crack continues to expand; performing underground methane burning and explosion operation for multiple times, and forming a highly-fractured impact crack network near the horizontal well section; meanwhile, part of coal is mixed with oxygen to be combusted, and a coal seam loosening ring with weak bearing capacity is formed near the bottom plate; closing the well for mineralization reaction; and gas extraction operation. According to the method, the gas extraction efficiency can be remarkably improved.

The application discloses a method suitable for hydrogen production in situ in an oil reservoir underground, and belongs to the technical field of oil and gas development. The method comprises the following steps: arranging three horizontal wells, i.e., upper, middle and lower horizontal wells, and a temperature detection well in the same reservoir, the temperature detection well is used for detecting the temperature of the middle horizontal well, and a hydrogen gas filter membrane is arranged at the upper horizontal well; a heating device is arranged at the middle horizontal well, a close cutting volume fracturing is carried out around the well, and a reaction zone is formed by filling a catalyst and a heat-conducting agent; in-situ ignition is carried out at the lower horizontal well, and an oxygen-containing gas is injected, so that the oxygen-containing gas is incompletely combusted to generate CO and CO2 and form a gasification zone; a heating device is used for heating to above 450 DEG C, when the gas in the gasification zone enters the reaction zone, water vapor is injected to carry out high-efficiency hydrogen production; and the upper horizontal well is opened, and the hydrogen gas filter membrane is used for extracting hydrogen gas. The hydrogen production block is separated, the underground hydrogen production efficiency is greatly improved, the energy utilization rate is improved, and therefore the method has good application value.

The invention relates to the technical field of geological exploration, in particular to a continental facies shale oil and gas horizontal well target window optimization method, device and equipment and a medium. The method comprises the following steps: acquiring a lithofacies division result of the inland facies shale oil and gas horizontal well in a target work area; longitudinal lithofacies distribution of the first continental facies shale oil and gas horizontal well is determined, logging curve characteristics of target points in each lithofacies are counted, and a lithofacies recognition sample library is established; establishing a lithofacies identification plate based on the lithofacies identification sample library, and identifying a function relationship between different logging curves of each lithofacies through the lithofacies identification plate; and by means of the function relation, the transverse distribution rule of the interlayer in the stratum of each continental facies shale oil and gas horizontal well in the target work area is longitudinally calibrated, and the target window range of each continental facies shale oil and gas horizontal well is determined. The sweet spot horizon of the whole area can be accurately and efficiently determined, and the target window of the continental facies shale oil and gas horizontal well is preferably selected.

The invention relates to the technical field of natural gas development, in particular to a method, system and device for calculating the final recoverable reserves of a staged fracturing horizontal well, and the method comprises the steps: determining the historical production data and production influence factors of a target well; constructing a prediction model based on the yield influence factors and historical yield data; and predicting the final recoverable reserves of the target well according to the prediction model. According to the method, the mapping relation between the engineering parameters and the first-year daily production of the single well is established in the same new block to be developed, and the data statistical analysis result of the production well in the block which is put into production under similar geological conditions is combined, so that effective prediction of the single-well EUR is realized.

The invention provides a design method for dynamically regulating and controlling the reasonable oil nozzle size after shale oil horizontal well fracturing. The design method comprises the steps that 1, fracturing data, well bore structure data and well mouth production data are collected; 2, according to the collected data, the bottom hole flowing pressure and the bottom hole flowback speed are calculated; 3, calculating the sedimentation degree of the propping agent; 4, calculating the critical flow velocity of the proppant; 5, calculating preset oil nozzle bottom hole flowing pressure and bottom hole flow velocity; and 6, under different conditions, the oil nozzle is adjusted, and the current reasonable oil nozzle size is obtained. According to the design method for dynamically regulating and controlling the reasonable oil nozzle size after fracturing of the shale oil horizontal well, the conditions of propping agent sedimentation and propping agent backflow are considered, the condition that multiple cracks exist in multi-section fracturing of the horizontal well is fully considered, real-time regulation and control over the flow-back oil nozzle can be conducted according to the actual flow-back condition on site, and wide application prospects are achieved.

The application discloses a metal soluble sealing assembly and a horizontal well staged fracturing process. The metal soluble sealing assembly comprises a connecting body, a releasing hand (12) arranged at the lower end of the connecting body, a necking portion and an inner cavity of the releasing hand, and the inner cavity contains a dissolving agent (13). A setting mechanism is arranged axially along the connecting body. After the setting mechanism is set in a casing (20), the thickness between the cross section of the releasing hand (12) cut from the necking portion (12-1) and the inner cavity is smaller than the wall thickness of other parts of the inner cavity. The problems that the existing bridge plug cannot simultaneously consider the pressure-bearing capacity and the dissolving rate in some special cases and the problem that the dissolving rate adjustment is limited for different working conditions are solved.

The embodiment of the invention relates to the technical field of oil and gas field development, in particular to a fracturing simulation device and method.The fracturing simulation device comprises a pump injection system, a reconstruction system, a flowback system and a monitoring system; the pump injection system is used for injecting sand-carrying fracturing fluid into the horizontal shaft; the reconstruction system is used for performing multi-cluster fracturing on the rock sample based on the sand-carrying fracturing fluid injected into the horizontal shaft; inverting rock sample multi-cluster fracturing to obtain fracture form data of the rock sample; the flow-back system is used for enabling sand-carrying fracturing fluid to flow back to the horizontal shaft from rock sample cracks after rock sample multi-cluster fracturing is finished; the monitoring system is used for acquiring migration data of the sand-carrying fracturing fluid corresponding to the fracture form data so as to determine a fracturing scheme according to the migration data, and the migration data at least comprises first migration state data of the sand-carrying fracturing fluid in the process of flowing back to the horizontal shaft.