106 results about "Acid fracturing" patented technology

The invention provides a thickening agent as well as a preparation method and application thereof. The thickening agent is prepared from acrylamide, acrylic acid long-chain ester and dichloromethyl (1-methyl ethylene) benzene, the thickening agent can be self-crosslinked under the acidic condition, the use of a cross-linking agent can be avoided, and the thickening agent can be self-crosslinked in the stratum under the acidic condition, so that the thickening effect can be achieved in the stratum, and the thickening effect is good. And the acidizing fracturing fluid can be prevented from being reduced along with the rise of the temperature in the stratum.

The invention provides a natural fracture acid fracturing process parameter optimization method and device, equipment and a medium, and the optimization method comprises the steps: obtaining geological and engineering data of a target block, carrying out the fitting of the geological and engineering data to obtain a natural fracture fitting model, determining the natural fracture fitting parameters according to the natural fracture fitting model, and carrying out the acid fracturing process parameter optimization of the target block. Further establishing a pressure drop characteristic parameter model and a natural fracture characteristic parameter model by using actually measured pressure data, and further establishing a productivity prediction model; and according to the productivity prediction model and the natural fracture fitting model, optimizing the acid fracturing process parameters of the natural fractures. According to the method, the condition of natural fractures encountered by underground hydraulic fractures is innovatively and dynamically judged according to the wellhead pressure change rule in the multi-stage alternate acid fracturing process, parameters can be dynamically adjusted on this basis to achieve dynamic optimization of a pump injection program, and a basis is provided for whether the natural fractures are transformed or not in real time in the construction process; and a new thought and a new method are provided for acid fracturing parameter design and optimization.

The application provides a compact dolomite reservoir composite acid fracturing process parameter evaluation system and method, which comprises a simulated fracture device, an acid injection device and a circulating water injection device. The acid injection device comprises an acid storage container, an acid injection pipeline and an acid discharge pipeline. The acid injection pipeline is connected to the acid storage container and the acid injection liquid inlet hole of the simulated fracture device at both ends. The acid discharge pipeline is connected to the acid injection liquid outlet hole of the simulated fracture device. The circulating water injection device comprises a water storage container, a water inlet pipeline and a circulating water discharge pipeline. The water inlet pipeline is connected to the water storage container and the water injection liquid inlet hole of the simulated fracture device at both ends. The circulating water discharge pipeline is connected to the water injection liquid outlet hole of the simulated fracture device and the water storage container at both ends. The application adopts reverse thinking to evaluate the composite acid fracturing process parameters such as the preflush / acid viscosity ratio, the pump injection displacement and the alternating series by taking the fractal dimension, the acid volume, the flow conductivity and the acid fluid loss as the targets, and is more specific and systematic.

The invention discloses a hydrogen sulfide scavenger for acid fracturing and a preparation method thereof, and relates to the technical field of hydrogen sulfide scavengers, the hydrogen sulfide scavenger comprises the following raw materials by weight: 30-45 parts of an aldehyde compound, 30-45 parts of an alcohol amine compound, 10-18 parts of a diamine bridging agent, 2-6 parts of a solubilizing compounding agent, 20-30 parts of a solvent and 1-3 parts of a catalyst; the aldehyde compound is divided into a component A and a component B, the mass ratio of the component A to the component B is 2: 1-3: 1, the component A is paraformaldehyde, and the component B is at least one of glyoxal or glutaraldehyde. By optimizing a molecular skeleton and introducing a hydrophilic group, the sulfur removal capacity and chemical stability in a strong acid environment are improved, compatibility with acid liquor is good, generation of acid sludge and insoluble precipitates is effectively inhibited, secondary damage to a stratum is avoided, and the high efficiency and mass transfer performance of a product are guaranteed through the preparation process.

The application provides a method and system for calculating the conductivity of a sand-acid fracturing reservoir simulation system, which comprises the following steps: constructing a simulation parameter combination set around sand-acid fracturing operation parameters for reservoir types with sand-acid fracturing requirements; analyzing fracture acid erosion data of different reservoirs by using a preset fracture acid erosion calculation model, and analyzing the embedding depth and deformation data of the proppant in combination with the injection rate parameters and the proppant data; further analyzing the sand concentration of sand-acid fracturing, and setting a rough body simulation distribution coefficient in combination with the injection rate, so as to form a reservoir fracture model that presents a real fracturing state; analyzing the permeability state of the reservoir fracture model after fracturing based on the rough body simulation distribution coefficient and the reservoir closure pressure; and further calculating the corresponding conductivity in combination with the fracture width calculated according to the fracture acid erosion data, the embedding depth and deformation data of the proppant. The method solves the problem that the sand-acid fracturing conductivity cannot be quantitatively analyzed, and provides support for field acid fracturing design and productivity prediction.

The invention discloses a high-temperature and high-pressure corrosion on-line porosity and permeability testing method. According to the method, an integrated process of triple dynamic correction-multistage self-cleaning filtration-AI self-adaptive collaborative testing is constructed, and high-precision online continuous testing of the porosity and the permeability in the corrosion process is achieved under the conditions of the confining pressure of 0-120 MPa, the pore pressure of 0.1-50 MPa, the temperature range of 25-220 DEG C and the multi-medium supercritical corrosion working condition; the problems that in an existing high-temperature and high-pressure corrosion test, pressure-temperature-concentration coupling correction is not comprehensive, corrosion products are accumulated for a long time and are prone to blockage, the fluid stability under the supercritical working condition is poor, and the test frequency adaptability is insufficient are solved. The method can accurately capture the instantaneous evolution law of rock physical properties in a complex corrosion environment, is suitable for extreme scenes such as deep CO2-EOR sealing, ultra-deep oil and gas reservoir acid fracturing transformation and high-temperature geothermal reservoir long-term operation, and provides data support with higher fidelity for engineering scheme optimization.

The invention discloses a deep cloud-ash interaction reservoir acid fracturing fracture extension rule simulation method, and relates to the technical field of carbonate rock oil-gas exploration and development acid fracturing engineering, and the method comprises the following steps: based on the related data of a target block, through single well geological statistics, indoor test and theoretical calculation analysis, obtaining the extension rule of the acid fracturing fracture of the target block; searching the relationship between the lithology and the geomechanical parameters; based on a single well geological parameter statistical result, a Petrel platform is utilized to construct a geological attribute, geomechanics and natural fracture distribution mechanism model, and a model foundation is laid for cloud ash interaction reservoir fracture extension rule simulation; based on the acid killing well geological attribute model, simulating and analyzing the influence of construction parameters on a crack extension rule by taking the cloud rock section acid etching crack area as a target, and performing parameter optimization; and on the basis of cloud-ash interaction reservoir acid fracturing fracture extension mechanism analysis and based on a cloud-ash interaction reservoir acid fracturing construction parameter optimization result, cloud-ash interaction reservoir fracture extension main control factor analysis and fine regulation and control parameter chart construction are carried out.

This invention discloses a method, equipment, and medium for calculating construction parameters of sand-added acid fracturing stimulation, relating to the field of carbonate reservoir stimulation. Based on the single-well production requirements of the oilfield development plan, it determines the target artificial fracture length and conductivity; determines the fracturing fluid volume required to achieve the target artificial fracture length; determines the proppant volume required for sand-added acid fracturing stimulation according to the principle that permeability is supported by the filler; establishes a flow reaction model and temperature field model within the acid fracture to determine the concentration field, velocity field, and temperature field within the fracture during acid injection; and determines the actual permeability formed by acid dissolution and the acid volume required for sand-added acid fracturing stimulation based on the acid concentration and flow rate at different times in the fracture. This invention accurately determines the construction parameters of the pre-fracturing acid, proppant, and acid for sand-added acid fracturing stimulation, providing a basis for the design and optimization of acid fracturing processes in carbonate reservoirs.

The invention provides a salt-sensitive self-thickening weighted acid fracturing system as well as a preparation method and application thereof, and belongs to the technical field of acid fracturing of oil fields. The salt-sensitive self-thickening weighted acid fracturing system comprises the following components in parts by weight: 27-40.5 parts of a hydrochloric acid aqueous solution, 10-50 parts of a weighting agent, 1-4 parts of a thickening agent, 1-4 parts of a corrosion inhibitor and 1.5-55 parts of water. The acid fracturing system has the characteristics of high density, low corrosion rate, good high-temperature stability, excellent compatibility and the like, and is suitable for acid fracturing transformation of deep high-temperature and high-pressure carbonate reservoirs.

This utility model discloses an acid fracturing fluid mixing device, relating to the field of oil and gas field equipment technology. The device includes a mixing cylinder with a cap at its top. A first motor is fixedly mounted on the top of the cap, and the output end of the first motor passes through the cap and is fixedly connected to a stirring shaft. Stirring blades are fixedly mounted on the circumferential wall of the stirring shaft. A feed branch pipe is fixedly mounted through the top of the mixing cylinder on one side of the first motor. By driving the first and second motors to rotate, the stirring shaft and stirring frame rotate in opposite directions, preventing the raw materials inside the mixing cylinder from flowing in one direction. This allows for faster and more thorough mixing of the raw materials, improving the mixing effect of the acid fracturing fluid. Brake wheels facilitate movement of the mixing device. Clockwise rotation of the screw moves the support base plate downwards, causing the damping pad to contact the ground, ensuring stable parking of the mixing device.

The invention provides a resveratrol fermentation broth separation method, which comprises: (1) carrying out filter pressing treatment on a resveratrol fermentation broth to obtain a second filter residue, the filter pressing treatment comprising carrying out acid pressing on the fermentation broth first and then carrying out alkali pressing, or carrying out alkali pressing on the fermentation broth first and then carrying out acid pressing; (2) carrying out extraction treatment on the second filter residue by adopting an organic solvent to obtain extract liquor; (3) washing the extract to obtain a washing solution; wherein the washing treatment comprises the following steps: sequentially carrying out alkali washing treatment and acid washing treatment on the extracting solution, or sequentially carrying out acid washing treatment and alkali washing treatment on the extracting solution to obtain a washing solution; (4) decoloring and dehydrating the washing solution, and concentrating to obtain a concentrated solution; and (5) carrying out crystallization treatment on the concentrated solution to obtain resveratrol. According to the method, the resveratrol extraction period can be shortened under the condition that a chromatographic method is not used, the cost is reduced, and the purity and the yield of resveratrol are improved.

The present application relates to the field of horizontal well coalbed methane production, in particular to a method for increasing the yield of coalbed methane by deep foam displacement in horizontal well, which is suitable for coalbed methane well with long horizontal section, difficult to discharge residual acid slag and poor deep acid washing effect. The method comprises the following steps: running the well flushing pipe column to the deepest part of the horizontal well, continuously injecting acid liquid and foam stabilizer compound solution into the oil pipe, using the retreating type well flushing technology to flush acid in sections until the last acid washing well section, shutting down the well to maintain acid pressure after the pump pressure is stable, carrying out acid immersion operation for 8 hours, running the oil pipe to inject sodium bicarbonate solution, and then carrying out sectional alkali injection after the pump pressure is stable. The alkali water reacts with the residual acid liquid to generate carbon dioxide gas and release heat, the foam stabilizer reduces the gas-liquid surface tension, a large amount of foam is generated to carry the residual slag out of the oil jacket annulus and the wellbore passage, and the generated inorganic salt is beneficial to the wetting and solution stability of the residual slag. The method solves the problem of difficult discharge of residual acid slag in deep acid washing of horizontal well, makes the acid washing effect more thorough, and the flowback efficiency is higher.

The invention discloses a resistance-reducing retarded acid thickening agent suitable for high-temperature deep well acid fracturing as well as a preparation method and application thereof, and belongs to the technical field of oil field reservoir transformation. The resistance-reducing retarded acid thickening agent is prepared by copolymerizing the following monomers in parts by weight: 3-6 parts of acrylamide, 18-20 parts of a cationic functional monomer, 2-5 parts of a rigid functional monomer and 0.5-1 part of a supramolecular long-chain functional monomer. The drilling fluid can be suitable for well depth and high-temperature characteristics of carbonatite gas reservoirs in Sichuan and Chongqing regions, has the characteristics of good temperature resistance, friction resistance and retarding performance, and can remarkably improve the deep acidification transformation effect of the reservoirs in acidification construction of the carbonatite reservoirs.

This invention provides a micro-acidification downhole formation testing device and a micro-acidification method based thereon. The device includes a hydraulic power module, a compartmentalized acid-carrying unit, an acid injection / discharge pump unit, a probe module, a downhole observation chamber for acid-formation reaction, a pipeline system, and a control circuit. The hydraulic module is configured to drive tool movements and control the testing process via hydraulic power. The acid injection / discharge unit is configured to control fluid flow, circulation, and pressure regulation. The injection probe of the probe module is seated at the target acidification or acid fracturing test injection point, connecting the device to the formation. The downhole observation chamber for acid-formation reaction is configured to monitor the physical / chemical parameters during injection / discharge. This invention effectively solves the problems of acid system and acid formulation screening, optimization, and process optimization in real-world acid environments within formations.

The present invention discloses a dual-pulsation acidic fracturing and permeability-enhanced low-permeability coal seam gas extraction system, comprising a pressure overshoot protection mechanism, a fracturing fluid transmission line, a gas extraction line, a mixing liquid box, a pressure regulating and monitoring mechanism, and a frequency regulating and monitoring mechanism; the present invention also discloses a dual-pulsation acidic fracturing and permeability-enhanced low-permeability coal seam gas extraction method, comprising the following steps: step S1, investigating the target coal seam and obtaining fracturing fluid; step S2, installing the above-mentioned system; step S3, adjusting the fracturing pressure and pulsating frequency of the fracturing fluid, and performing continuous cyclic fracturing on the fracturing borehole; step S4, adjusting the fracturing pressure and pulsating frequency of the fracturing fluid to, and performing continuous cyclic fracturing on the fracturing borehole; step S5, repeating steps S3-S4 five times, and extracting and detecting gas concentration to generate data. The present invention has the advantages of increasing the connectivity of the internal fracture-pore structure of the coal body, improving the permeability enhancement effect of the coal seam, improving the coal seam gas extraction efficiency, and having an interlocking structure.

The present application relates to a kind of acid liquid fingering quantitative evaluation method for carbonate rock geothermal reservoir preflush acid fracturing, belong to the technical field of enhanced geothermal system reservoir stimulation.Establish three-dimensional model and multi-field coupling numerical model considering fingering effect, using numerical simulation method can obtain the three-dimensional morphological change of fracture surface, by calculating etching front fingering coefficient, the acid liquid fingering effect in the process of carbonate rock heat reservoir preflush acid fracturing is quantitatively evaluated, and the sensitivity of rock plate temperature, preflush viscosity, acid injection displacement and other parameters to fingering effect is also analyzed, which provides theoretical basis and technical support for geothermal reservoir depth acid fracturing technology.

This invention belongs to the field of oil and gas field development technology, and specifically relates to an acid tank preparation and filtration device. It includes a first installation pipe, a second installation pipe, and an acid preparation and circulation pipeline fixedly installed between the first and second installation pipes. The first and second installation pipes are connected to the acid preparation and circulation pipeline via unions. A first valve and a second valve are respectively installed on the first and second installation pipes. A filter screen is installed inside the acid preparation and circulation pipeline. This invention utilizes the circulation time of the prepared acid solution to filter difficult-to-dissolve chemical materials and other solid particles in the acid tank, saving water used for cleaning the acid tank, reducing the safety risks of cleaning the acid tank, lowering the probability of fracturing trucks running dry, improving the first-time success rate of acid fracturing operations, greatly simplifying the acid tank cleaning process, and providing convenient maintenance and safe filtration operations.

This invention relates to the field of oil and gas field enhancement and stimulation technology, and discloses a method for screening coupling agents for acid fracturing in carbonate rocks based on interfacial film formation to regulate acid-rock reactions. The method first conducts basic physical property tests on different types of coupling agents to evaluate their wettability and spreading ability on carbonate rock surfaces; then, it characterizes the adsorption and film-forming behavior of the coupling agents on the rock surface; it evaluates the compatibility of the coupling agents with different fracturing fluid systems; it analyzes the influence of coupling agent concentration and stirring conditions on the acid-rock reaction rate through acid-rock reaction experiments, and establishes an evaluation index for acid-rock reaction rate control; finally, it conducts reservoir adaptability evaluation under different temperature, mineral composition, and porosity conditions, and comprehensively screens out target coupling agents suitable for acid fracturing operations in carbonate rocks. This invention establishes a systematic coupling agent screening process, which can effectively reduce the acid-rock reaction rate, increase the acid interaction distance, and thus improve the acid fracturing stimulation effect of carbonate reservoirs.

The application discloses a hydrogen sulfide scavenger for acid fracturing and a preparation method thereof, and relates to the technical field of hydrogen sulfide scavengers, and comprises the following raw materials in parts by weight: 30-45 parts of aldehyde compounds, 30-45 parts of alcohol amine compounds, 10-18 parts of diamine bridging agents, 2-6 parts of solubilizing complexing agents, 20-30 parts of solvents and 1-3 parts of catalysts; the aldehyde compounds are divided into A component and B component, wherein the mass ratio of the A component to the B component is 2:1-3:1, the A component is paraformaldehyde, and the B component is at least one of glyoxal or glutaraldehyde. Through optimization of a molecular skeleton and introduction of a hydrophilic group, the hydrogen sulfide scavenger improves sulfur removal capacity and chemical stability in a strong acid environment, has good compatibility with acid liquid, effectively inhibits the generation of acid residues and insoluble precipitates, avoids secondary damage to a formation, and ensures high efficiency and mass transfer performance of the product through a preparation process.

The invention belongs to the technical field of carbonate reservoir transformation, and particularly relates to an acid-resistant cationic polyacrylamide polymer as well as a preparation method and application thereof. The polymer has a structure as shown in a formula (I). The polymer disclosed by the invention is used as an acidic fracturing fluid thickening agent, overcomes the technical problem that a conventional polyacrylamide thickening agent is not resistant to acid and temperature, and can achieve the effect of delaying the corrosion speed of an acid fluid to rock at the same time.

The application relates to the technical field of carbonatite reservoir acid fracturing, and discloses a polymer, a preparation method thereof and a composition for gelled acid. The polymer comprises a structural unit shown in formula A, a structural unit shown in formula B and a structural unit shown in formula C, the viscosity-average molecular weight of the polymer is 5-8 million g / mol, the molecular weight distribution is 3-5, the weight ratio of the structural unit shown in formula A, the structural unit shown in formula B and the structural unit shown in formula C is 1:1.2-1.8:0.1-0.2. When the polymer is used as an acid liquid thickening agent, the polymer has the characteristics of high temperature resistance, shear resistance, low initial viscosity and low gel breaking liquid residue content.

A high-temperature, high-salt soluble temporary plugging microsphere for acid fracturing and its preparation method are disclosed. The preparation method includes the following steps: (1) Dispersing micro / nano particles in an ethanol aqueous solution under stirring, adding a silane coupling agent to remove oxygen, stirring evenly, adjusting the pH of the system to 9-10, then heating and refluxing, centrifuging, washing with anhydrous ethanol, and drying; (2) Dispersing the product of step (1) in deionized water, then adding a functional monomer and stirring until dissolved, adjusting the pH of the system to 7-8, heating, adding a first initiator, stirring evenly, and refluxing; (3) Maintaining the reaction temperature of step (2), adding a slow-dissolving monomer, a polyol, and a synergist in sequence, stirring to dissolve, adding a second initiator, stirring, refluxing, then sealing, and heating; (4) Drying, pulverizing, and sieving. The temporary plugging microsphere has good plugging performance and good resistance to iron ions and salt and temperature.

The application provides a heterogeneous reservoir acid fracturing parameter design method and system, the method constructs an acidification reconstruction geometric model for a reservoir to be reconstructed, introduces required acidification section length and section thickness data to calculate acid liquid flow rates in fractures under different construction discharge capacities in combination with fracture attribute data, further considers acid etching reaction rates and mass transfer coefficients to calculate acid concentrations on inner walls of fractures reacted with a reservoir matrix, determines etching widths of natural fracture walls according to attribute parameters of the reservoir matrix, further calculates reservoir etching volumes corresponding to different construction acid amounts and acid etching fracture widths and lengths, finally decides corresponding acid etching fracture conductivity capacities according to a correction principle of an N-K model, and selects optimal acid injection parameters according to preset optimization conditions. By using the scheme, the problems of small calculation scales and complicated operations in the prior art are effectively overcome, analytical solutions are flexibly used in the calculation process, and an acid injection scheme with optimal acid etching effects and conductivity capacities is accurately and efficiently selected.

The application provides a preparation method of a delayed crosslinking agent and an acid fracturing fluid, and the method comprises the following steps: carrying out a chelation reaction on a transition metal substance and a ligand substance in a solvent to obtain the delayed crosslinking agent; the transition metal substance is a zirconium source and a titanium source, the zirconium source is one or more of zirconium nitrate, zirconium sulfate and zirconium oxychloride, and the titanium source is titanium tetrachloride; the ligand substance is at least three of glycerol, lactic acid, triethanolamine, sodium gluconate and sodium citrate; and the mass ratio of the transition metal substance and the ligand substance is 1:1-10. The acid fracturing fluid mainly comprises hydroxypropyl carboxymethyl guar gum, the delayed crosslinking agent and a pH regulator, and can still achieve the delayed crosslinking effect at high temperatures. The fracturing fluid is an acid fracturing fluid with temperature-controlled viscosity release, has the advantages of high-temperature resistance, temperature-controlled crosslinking, low friction drag and low residue, and is suitable for low-permeability oil and gas reservoirs, and solves the problems of clay swelling and migration and high pipe string friction drag.

The invention relates to the technical field of oilfield chemistry, in particular to a glycosyl sulfamic acid betaine type surfactant and a preparation method and application thereof.The glycosyl sulfamic acid betaine type surfactant is prepared according to the following steps that firstly, taurine and sodium methoxide with the required amount are mixed and then react, and a first reactant is obtained; 2, adding a required amount of glucose into the first reactant, and reacting to obtain an intermediate product; and step 3, adding N, N-dimethyl-2, 3-epoxypropyl alkyl ammonium chloride into the intermediate product for reaction, and recovering generated sodium chloride to obtain the glycosyl sulfamic acid betaine type surfactant. The method is easy and convenient to operate, the raw materials are green and degradable, environmental pollution is avoided, the obtained glycosyl sulfamic acid betaine type surfactant is used for preparing the acid fracturing discharge aiding agent, the surface tension of an aqueous solution can be effectively reduced, the technical requirements of the acid fracturing discharge aiding agent can be met, the overall production cost can be reduced, and the method is suitable for industrial production. The acid fracturing device is suitable for acid fracturing operation in different operation environments.

The application discloses a rotatable telescopic short section, which comprises a longitudinally extending core shaft, a body sealedly sleeved outside the core shaft, and a connecting mechanism connecting the core shaft and the body with each other. The connecting mechanism comprises a connecting body fixedly connected with the body, and a torque transmission member fixedly connected with the connecting body. The torque transmission member is configured to be connected with the core shaft through a shear pin and a longitudinally arranged key groove assembly in an initial state, to be movable along the longitudinal direction after the shear pin is sheared by stress borne by the rotatable telescopic short section in a first state, and to be capable of transmitting a rotating torque from the body to the core shaft through the key groove assembly in a second state in which rotation is required. The rotatable telescopic short section can be used to compensate for the contraction of a well completion pipe string, and can realize the function of rotating torque transmission, thereby meeting the requirement of handling abnormal conditions on site. The application further discloses an acid fracturing well completion pipe string and an acid fracturing well completion method.

This invention discloses a method for preparing a retarder for acid fracturing. The retarder is obtained by copolymerizing a nonionic water-soluble monomer, a silicon-containing monomer, an organic acid adsorbent monomer, and a hydrophobic monomer in an anhydrous organic solvent. After the reaction, the resulting product is directly used as an additive in the working fluid without the need for separation and drying. The organic acid adsorbent monomer contains an iminodiacetic acid structure, which chelates with Ca on the surface of carbonate rocks. 2+ Stable adsorption; after hydrolysis, the silicon-containing monomers condense with hydroxyl groups on the rock surface to form chemical bonds, while the condensation and cross-linking between silicon and hydroxyl groups construct a multi-layer network structure; the hydrophobic monomer is an allyl polyoxyethylene alkyl ether, which forms a hydrophobic barrier on the adsorption film surface through hydrophobic association. The resulting retarder, through the synergistic effect of four mechanisms—chelation adsorption, chemical bonding, multi-layer film formation, and hydrophobic shielding—can reduce the acid rock reaction rate by more than 90% at 150°C and in 20% hydrochloric acid, making it suitable for high-temperature carbonate rock acid fracturing operations.

The invention discloses an acid fracturing multi-field coupling numerical simulation method based on a cloud-ash interaction reservoir, and relates to the technical field of oil and gas field development, the method comprises the following steps: determining a geologic model of the cloud-ash interaction reservoir in an on-site stratum and three-dimensional stress field distribution according to exploration data; based on the geologic model and the three-dimensional stress field distribution, constructing cloud ash reservoir digital cores in different interaction modes, and obtaining a numerical model corresponding to the geologic model; dividing a numerical model by using the introduced adaptive grid; respectively constructing target control equations based on the numerical model subjected to grid division and physical mechanics and fluid seepage characteristics of the cloud-ash interaction reservoir; establishing a fluid-solid-thermal-chemical multi-field coupling equation based on the target control equation, and executing numerical simulation of acid fracturing by solving the equation; theoretical guidance is provided for acid fracturing site construction of the cloud-ash interaction reservoir, and the blank of acid fracturing numerical simulation methods of the cloud-ash interaction reservoir at home and abroad is filled.

The invention discloses a reservoir fracture-cavity body engraving method and system based on acid fracturing pressure response, and belongs to the technical field of petroleum geological exploration. The method comprises the following steps that communication time is determined on the basis of oil pipe pressure response in an acid fracturing construction curve of an acid fracturing well, and then the extending distance of an artificial fracture within the communication time is obtained; and the distance between the edge of the fracture-cavity body and the shaft crack initiation point under the condition of different seismic tensor attribute threshold values is obtained, the superposition degree is calculated by combining the extending distance of the artificial fracture within the communication time, the optimal seismic tensor attribute threshold value is determined, and the target well fracture-cavity body is engraved according to the optimal seismic tensor attribute threshold value. According to the method, geology and engineering are integrated, fracture-cavity body seismic data and acid fracturing pressure response data can be directly utilized to finely engrave the fracture-cavity body, and a basis is provided for subsequent development scheme decision-making of an oil well.

The invention discloses a carbonate rock acid fracturing effect main control parameter analysis method and system, relates to the technical field of acidification, and solves the problem that main control parameters are difficult to identify in existing carbonate rock acid fracturing effect assessment. Calculating the correlation of each parameter based on the parameter data, and filtering out the parameters with extremely high correlation; executing a random forest algorithm and a recursive elimination algorithm based on the parameters to obtain a first weight and a second weight of the parameters; performing weighted average on the first weight and the second weight to obtain a comprehensive weight of the parameter; selecting parameters according to the comprehensive weight to construct a plurality of schemes, inputting the schemes into a BP neural network to simulate the yield to obtain the correlation between the actual yield and the predicted yield, and selecting the parameters contained in the scheme with the highest correlation as main control parameters of the acid fracturing effect; and analyzing carbonate rock acid fracturing effect master control parameters based on a random forest, recursive elimination and a BP neural network algorithm.