215 results about "Oil shale" patented technology

The invention discloses an oil shale in-situ conversion heat flow solidification multi-field coupling method considering thermally induced fractures, and relates to the technical field of complex oil reservoir development, and the method comprises the following steps: considering coupling relationships between fractures and a heat transfer field, a seepage field, a stress field and a chemical reaction field, and establishing a heat flow solidification multi-field coupling model; constructing a natural fracture network in the transformation model at an initial time step; simulating a heat flow curing multi-field coupling model, and detecting stress key data of each grid in the model at each time step; in each time step, according to the stress key data of each grid, identifying a rock matrix grid for generating a thermally induced fracture, and constructing a thermally induced fracture grid; when a new thermally induced crack is generated in one time step, detecting the intersection characteristics of the new crack and the existing crack, and combining the cracks which are consistent in opening direction and adjacent in position; and continuing numerical simulation of the next time step until the simulation is finished. The method has wide application value in the aspect of prediction of the thermally induced cracks in the in-situ conversion process of the oil shale.

The invention provides a new method for calculating the borehole wall collapse pressure of a fractured shale stratum, which comprises the following steps of: 1, preparing an experimental rock sample, and carrying out sound wave characteristic test on bed rock and a fractured rock sample and mechanical experiment test on the rock sample; step 2, calculating an integrity coefficient K upsilon, a geological strength index GSI, a rock mass disturbance coefficient D and a lithology index mi of the rock; 3, a Hoek-Brown strength criterion for evaluating the fractured formation based on sound waves is established; 4, a principal stress expression of the well walls of the inclined well and the horizontal well is obtained through calculation; and 5, establishing a fractured oil shale formation borehole wall collapse pressure calculation model. According to the new method for calculating the well wall collapse pressure of the fractured shale formation, the problem that a conventional homogeneous formation collapse pressure calculation model is not suitable for well wall stability prediction of the fractured shale formation is solved, and a new theoretical basis and technical support are provided for the well wall stability problem in the oil shale exploitation process.

The invention discloses a geothermal development oil shale and CO2 geological storage integrated method, which relates to the field of complex oil and gas reservoir development, and comprises the following steps: designing U-shaped well process parameters, enabling CO2 fluid to flow to a high-temperature geothermal reservoir through a descending section of a U-shaped well, injecting the CO2 fluid into the oil shale reservoir along an ascending section of a shaft after sufficient heat exchange, preheating the oil shale, and storing the CO2 fluid into a high-temperature geothermal reservoir through the descending section of the U-shaped well. Terrestrial heat extraction and utilization are realized; after the temperature of the oil shale layer rises to the target temperature, the oil shale layer is further heated through manual heating, and in-situ conversion development of the oil shale is achieved; after completion, produced CO2 is injected into the oil shale layer again through the U-shaped well, and collaborative development of CO2 geological storage, geothermal extraction and oil shale in-situ conversion is achieved. Geothermal energy is efficiently extracted through CO2 and used for oil shale in-situ pyrolysis, the extra manual heating cost needed by oil shale in-situ conversion is remarkably reduced, and the economic feasibility of a pure storage project and oil shale in-situ conversion development is improved.

The invention provides an oil shale pyrolysis reaction analysis method and system based on kinetic model calibration, and the method comprises the steps: building a pyrolysis reaction kinetic model of a plurality of parallel reactions based on reaction setting parameters, and carrying out the calibration of the pyrolysis reaction kinetic model for each reaction parameter according to constraint requirements; constructing a target function by combining the thermal history of the region of the oil shale; a penalty function method is utilized to simplify a complex solving problem, reaction parameters of parallel reaction at a minimum point of a target function are optimized and calculated, and parameter calibration of the oil shale pyrolytic reaction kinetic model is achieved; and simulating and analyzing the decomposition process of the oil shale organic matter pyrolysis product by using the calibrated kinetic model. According to the scheme, the defect that the complex molecular pyrolysis reaction cannot be accurately represented in the prior art is overcome, the kinetic essence of the kerogen hydrocarbon forming process can be objectively reflected by adopting the parallel reaction model, and the target function and the penalty function are constructed to realize parameter calibration of the oil shale pyrolysis chemical reaction; the real hydrocarbon forming process of the organic matter can be accurately described.

The present disclosure relates to a dust-removed odor sampling device for oil shale and a photoelectric fused method for underground in-situ exploration and thermal evolution stage monitoring of oil shale, belonging to the technical field of oil shale in-situ exploration and exploitation. The present disclosure includes: establishing an dust-removed odor sampling device, which includes an imitation sandfish lizard dustproof chamber, an imitation leaf filter membrane, a single-chip microcomputer controller, a dust collection box, a solenoid valve and an air pump; using a redesigned FB score and a feature selection algorithm to optimize a gas sensor array and reduce the apparatus volume and energy consumption; and combining the optimized gas sensor array with the optical gas detector to realize the underground in-situ exploration and thermal evolution stage monitoring of oil shale by the photoelectric fusion method.

The invention discloses an oil shale semicoke-based weather-resistant low-cost mulching film and a preparation method thereof.According to the oil shale semicoke-based weather-resistant low-cost mulching film and the preparation method thereof, oil shale semicoke is used as a main raw material, the production cost is reduced, meanwhile, reasonable recycling of resources is achieved, and the concept of sustainable development is met; according to the method disclosed by the invention, the oil shale semicoke is pretreated by adopting the acid solution, so that impurities can be effectively removed, the specific surface area of the oil shale semicoke is increased, and the subsequent reaction efficiency is improved; then through hydrolysis reaction of tetrabutyl titanate, nano titanium dioxide is attached to the surface and the pore structure of the pretreated oil shale semicoke, and by introducing the nano titanium dioxide, the weather resistance and the mechanical property of the mulching film material are remarkably improved; and 3, 5-bis (trifluoromethyl) styrene and cinnamamide are polymerized and grafted on the surface of the oil shale semicoke through an addition reaction between double bonds, so that the prepared mulching film has excellent weather resistance and corrosion resistance.

The invention relates to a mineral multi-stage separation and upgrading system, which belongs to the technical field of mineral separation and upgrading, and comprises a first separation bed body and a separation assembly arranged on the first separation bed body, the separation assembly comprises a plurality of air chambers which are continuously arranged on the lower side of the first separation bed body along the length direction of the first separation bed body; the multiple air distribution holes are vertically formed in the bed surface of the first separation bed body at equal intervals, and the multiple air valves are vertically and fixedly arranged at the bottom of the air chamber in a one-to-one correspondence mode. Through cooperative use of the air chamber and the air distribution holes in the first separation bed body, airflow is blown out from the air distribution holes, so that oil shale particles on the bed surface are in a fluidized state and move in the length direction of the bed surface, and the oil shale particles are separated from the air distribution holes; pulse airflow is output by the air valve and is blown out through the air distribution holes, so that the movement activity of the stacked and interlaced oil shale particles on the bed surface is enhanced, the oil shale is loose, fluidized and uniformly distributed, the separation of concentrate and gangue is realized, the separation effect of the oil shale particles is ensured, the grade of the oil shale is improved, and the energy consumption of a subsequent pyrolysis oil extraction process of the oil shale is reduced.

The invention provides an oil shale formation temperature field simulation method and system for fluid injection heating mining, a storage area is divided into a plurality of unit mining spaces according to geologic feature data of the storage area to be mined, a mass conservation operation model corresponding to fluid injection in-situ mining is constructed for each unit mining space based on the principle of mass conservation, and the temperature field of the oil shale formation is simulated. According to the principle that high-temperature fluid carries heat to conduct heat transfer and exchange with a rock mass system in a conduction and convection mode and the influence on a temperature field in a rock mass, an energy operation model corresponding to fluid injection in-situ mining is built; preset initial parameters are introduced, the mass conservation operation model and the energy operation model are solved based on the discrete process, initial mass field data and energy field data are calculated, and then temperature field data of subsequent time are calculated in combination with a Newton iteration method. According to the scheme, the limitation of low precision of existing temperature field simulation is overcome, and rigorous and accurate temperature field space-time distribution of the oil shale under fluid injection heating is obtained.

The invention discloses a preparation method of an oil shale-based aggregate ultra-high performance concrete material, which comprises the following steps: (1) uniformly mixing oil shale slag, glass powder, lithium slag powder and magnesium oxide, sintering, cooling to room temperature after sintering, and crushing the sintered product to obtain an oil shale-based fine aggregate; (2) taking the following raw materials: a composite cementing material, the oil shale-based fine aggregate, fly ash, silica fume, modified ardealite powder, fibers, a water reducing agent, sodium hydroxide and / or potassium hydroxide; the composite cementing material is composed of Portland cement and mineral powder. The concrete material is obtained by uniformly mixing the raw materials, adding mixing water and uniformly stirring. According to the method disclosed by the invention, the problem that the strength and the impermeability of the ultra-high performance concrete material prepared by taking the oil shale residues as the fine aggregate are reduced is solved, and the problem that cement components of the ultra-high performance concrete material are wasted is relieved.

The invention provides an iron-based catalyst for in-situ exploitation of oil shale as well as a preparation method and application of the iron-based catalyst. The iron-based catalyst for in-situ exploitation of the oil shale comprises the following raw materials: a first active component metal element, a second active component metal element and a silicon source, the metal elements of the first active component comprise iron and auxiliary metal elements in a molar ratio of 1: (0-10), and the metal elements of the second active component comprise one or a combination of more than two of molybdenum, nickel, cobalt and tungsten; the molar ratio of the first active component metal element to the second active component metal element is (1-20): 1; the iron-based catalyst for in-situ exploitation of oil shale is prepared by emulsifying raw materials containing a first active component metal element, a second active component metal element and a silicon source. The iron-based catalyst for in-situ exploitation of the oil shale is stable in structure and can be applied to in-situ exploitation of the oil shale under wide temperature and pressure conditions.

The invention provides an oil shale supercritical CO2 fracturing and in-situ conversion integrated device and a working method, belongs to the technical field of oil shale exploitation, and realizes efficient cooperation of supercritical CO2 fracturing and in-situ conversion by integrating a CO2 liquefaction storage system, a fracturing heating system, a stratum simulation system and a data monitoring system. The device comprises a CO2 liquefying and storing system, a CO2 liquefying and storing system, a CO2 liquid storage system, a CO2 liquid storage system and a CO2 liquid storage system, the oil shale fracturing and heating system is used for fracturing the rock core under the simulated formation confining pressure condition and triggering the oil shale in-situ cracking reaction through medium-frequency heating; the oil shale fracturing model is used for simulating an underground fracturing environment and guiding crack propagation; the data monitoring system collects temperature and pressure parameters in real time to optimize process regulation and control. The fracturing process and the conversion process are innovatively coupled, the supercritical CO2 has the characteristics of a fracturing medium, a heat transfer carrier and a reaction medium, the energy utilization rate and the CO2 circulation efficiency are remarkably improved, and the oil shale recovery rate is increased.

The invention relates to the technical field of mine filling materials, in particular to a composite filling cementing material and a preparation method thereof, and the composite filling cementing material comprises the following components: oil shale slag, ironmaking slag, clay mineral slag, Portland cement, a composite activator and a polycarboxylate superplasticizer. The composite activator comprises the following components: water glass, sodium carbonate, metakaolin, anhydrous sodium sulfate, calcium sulphoaluminate, dolomite, silica fume, potassium feldspar and an excitation accelerator. The gelling part is completely composed of various industrial wastes, the materials are convenient to obtain, the manufacturing cost is low, the composite exciting agent can effectively excite the potential activity of the oil shale residues, the ironmaking slag and the clay mineral residues and promote the hydration reaction of the oil shale residues, the ironmaking slag and the clay mineral residues, and the prepared composite filling gelling material has good moisture resistance and good durability.

The invention discloses an oil shale well wall surrounding rock strength analysis method and device under an oil-based mud condition, and relates to the technical field of well wall stability of petroleum and natural gas drilling engineering.The method comprises the steps that engineering coring is conducted on a target oil shale stratum, and multiple sets of core samples are prepared; performing soaking experiments on the multiple groups of core samples in the oil-based mud in different time periods respectively; performing comprehensive rock mechanical property testing on the multiple groups of soaked core samples to obtain rock mechanical parameters of the oil shale samples under different oil-based mud conditions; based on the rock mechanical parameters, establishing a mathematical characterization model of the dynamic relationship between the drilling mud invasion degree and the rock mechanical parameter evolution of the oil shale sample; and based on the mathematical representation model, predicting the collapse pressure and the potential collapse period of the oil shale stratum under different drilling parameters and stratum conditions. The technical problem that in the prior art, analysis precision and analysis reliability of stratum strength parameters of the stratified oil shale under the oil-based mud environment are low is solved.

The invention belongs to the field of waste resource utilization and the field of wastewater treatment, and particularly relates to a preparation method and application of an oil shale semi-coke catalyst, and the preparation method comprises the following steps: crushing, grinding and sieving oil shale semi-coke to obtain oil shale semi-coke powder; dispersing the obtained oil shale semi-coke powder into an activator solution, stirring and reacting at room temperature to activate the oil shale semi-coke powder, and finally centrifuging, washing and drying to obtain the target product oil shale semi-coke catalyst. The oil shale semicoke is a solid residue obtained by destructive distillation of oil shale at 450-600 DEG C under an anaerobic condition. The activating agent solution is one of nitric acid, oxalic acid or phosphoric acid, and the mass concentration of the activating agent solution is 4-32%. According to the invention, the lattice structure and surface element composition of the oil shale semicoke can be adjusted, the specific surface area of the oil shale semicoke is increased, the catalytic activity of the oil shale semicoke is improved, and the removal effect of persulfate on organic matters is improved in a pH range of 4-10.

The invention discloses an artificial geothermal reservoir construction and development method based on oil shale reverse oxidation, and belongs to the technical field of resource exploitation, the method comprises the following steps: reservoir well construction: arranging an injection well, an exploitation well and a heat recovery well in a target layer section; an initial high-temperature environment is formed through manual heating, so that the oil shale is pyrolyzed to generate fixed carbon; injecting air to form an oxygen-enriched environment, initiating a fixed carbon oxidation self-heating reaction, and continuously pyrolyzing the oil shale; terrestrial heat is exploited through a circulating working medium, the air flow and components are dynamically controlled, and temperature control and safe operation are achieved; and finally reinjecting and sealing the carbon dioxide. The device can convert low-grade oil shale into clean geothermal energy, and has the advantages of energy conservation and environmental protection.

The invention relates to the technical field of improvement methods, in particular to a soil conditioner based on ultramicro-granulated energy-gathered humic acid, and energy-gathered humic acid raw materials of the soil conditioner based on ultramicro-granulated energy-gathered humic acid comprise weathered coal, lignite, peat, oil shale, an auxiliary additive, a thermophilic bacterial agent, an organic fertilizer and an inorganic fertilizer. According to a formula, the ratio of weathered coal to lignite to peat to oil shale to an auxiliary additive to a thermophilic bacterial agent to an organic fertilizer to an inorganic fertilizer is 4: 4: 2: 2: 1: 1: 2: 2; the ultramicro-pelletized energy-gathered humic acid soil conditioner is prepared by adopting a soil conditioner preparation method. According to the soil characteristics of the desert area, local materials can be used for improving the soil of the desert area, the soil structure of the desert area is improved, the fertility is improved, and the ecological balance of the soil is maintained.

The present application discloses a preheating and pressure-regulating device for alternating gas injection of oil shale, which comprises: a shell, a supporting foot, an upper cover, an air outlet pipe, a temperature sensor, an inlet pipe, an electrically controlled valve, a flow sensor, a pressure sensor, a control cabinet, an impeller, a rotating shaft, an air outlet plate, a bearing, an inner gear ring, a through hole, an upper disc, a heat-conducting straight pipe, a heat-conducting tooth, a cylindrical gear, an annular groove, an annular seat, a connecting block, a power supply plug, a fixed outer ring seat, a first flexible rubber ring sheet, a second flexible rubber ring sheet, a heating rod, a supporting seat, a ball bearing, a fixed annular ring, an annular groove, a cam, an annular conductive sheet, an annular slide groove, a fixed carrier sleeve, an annular carrier groove and an annular edge sheet. The benefit of the present application is that it is heated by a plurality of heating rods, and the heating rods are evenly installed at the bottom of the upper disc, so that the heating rods can rotate with the upper disc, thereby facilitating the heating of the gas inside the shell and improving the uniformity of heating.

The invention discloses a coal and oil shale oil gas resource co-mining system and method. According to the system, an injection device comprises a pressurizing direct flow pipe, a feeding pipe and a mixer; the pressurizing direct flow pipe is connected with the injection well; the feeding pipe and the mixer are connected to the pressurizing direct flow pipe; the gasifying agent adjusting device comprises a flow adjusting valve and a flow meter; the flow regulating valve is connected in series to the pressurizing direct flow pipe; a separation device in the extraction assembly is connected with an extraction well; the three-dimensional geological monitor is arranged on the earth surface; the temperature probe is mounted on the side wall of the production well; the pressure probe is mounted on the side wall of the injection well; a product meter in the collection assembly is connected with a separation device; the method comprises the steps that high-temperature water vapor and pure oxygen are mixed through a mixer to form a gasifying agent, then the gasifying agent is injected into a coal seam goaf, the gasifying agent and residual coal are subjected to a combustion reaction to generate high-temperature coal gas, the high-temperature coal gas and overlying oil shale are subjected to a pyrolytic reaction to generate an oil-gas mixture, and the oil-gas mixture is extracted to the earth surface to be separated. By means of the system and method, efficient and green co-mining of coal and oil shale can be achieved.

A highway roadbed composite material and a roadbed manufacturing method, belonging to the technical field of highway construction, the present invention provides a highway roadbed composite material comprising: a base layer, composed of oil shale waste residue, slag, crushed stone and fly ash; a cold-resistant layer compounded on the base layer, composed of impact-resistant polystyrene, water reducer and quicklime; a wear-resistant layer compounded on the cold-resistant layer, composed of waste rubber, carbon black and additives. The roadbed manufactured by the present invention has the characteristics of cold resistance and wear resistance, excellent low-temperature impact resistance, low manufacturing cost, and energy-saving and environmental protection, meeting the requirements of highway roadbed design specifications and the strength and deformation requirements of highway roadbeds. In addition, the roadbed manufactured by the present invention has a long service life, is safe and reliable to use, has a wide range of applications, and has a simple manufacturing process without the need for large-scale equipment.

The invention discloses oil shale waste / fly ash glass ceramics as well as a preparation method and application thereof, relates to the technical field of glass ceramics, and solves the problems that in the prior art, OSA post-treatment is serious in environmental harm and low in resource utilization rate, and when OSA is applied to glass ceramics preparation, the crystal phase structure is unstable, the process controllability is poor, and the production cost is high. And high quality, low cost and sustainable utilization of the microcrystalline glass are difficult to realize at the same time. The oil shale waste / fly ash glass ceramic is prepared from 80 parts of industrial waste residues, 4-6 parts of nucleating agent and 14-16 parts of auxiliary components, the industrial waste residue is composed of 50-75 parts of oil shale residue and 5-30 parts of fly ash; the preparation method comprises the following steps: mixing the oil shale waste with the fly ash, adding the nucleating agent and the auxiliary components, grinding, melting, preserving heat, pouring the melt into a mold, and annealing to obtain base glass; and carrying out polishing treatment and heat treatment on the base glass to obtain the microcrystalline glass. The invention can be applied to the fields of building decoration and electrical insulating materials.

The invention discloses a natural gas-assisted oil shale self-heat-generation in-situ conversion development method, and belongs to the field of oil shale in-situ exploiting.The method comprises the steps that an inverse seven-point well pattern is arranged in a natural gas-assisted oil shale self-heat-generation in-situ conversion development target area to serve as a development well pattern, reservoir transformation is conducted on a reservoir of the target area, and a fracture network is formed; high-temperature nitrogen is injected through the injection well to locally preheat the oil shale reservoir, then normal-temperature air is injected into the injection well to cool the bottom of the injection well, and finally the normal-temperature air and natural gas are separately injected into the bottom of the injection well through the double-layer oil pipe. Under the assistance of natural gas, residues generated after kerogen thermal cracking are subjected to an oxidation reaction to release heat, an oil shale reservoir is heated, meanwhile, natural gas oxidation can effectively supplement insufficient heat release of low-oil-content oil shale ground storage residues in oxidation, successful triggering and operation of a self-heat-generation reaction are guaranteed, and the oil shale reservoir is protected from being damaged. And efficient output of oil-gas cracking products of the oil shale reservoir is realized.

The invention discloses an oil shale in-situ oxidation heat collection system and method, and belongs to the technical field of oil shale in-situ development and utilization. Comprising a well pattern structure and a ground power generation device. The well pattern structure comprises an injection well, a heat recovery well and a plurality of observation wells; an electromagnetic sensor is arranged in each observation well, the oil shale layer is fractured through hydraulic fracturing to form fractures, the injection well communicates with the heat recovery well, and nanometer magnetic induction particles are added into fracturing fluid to serve as a propping agent; the observation well is used for monitoring the distribution condition and the magnetic field intensity of the nano magnetic induction particles; organic matters and fixed carbon in the oil shale are directly oxidized to release heat in an underground in-situ state, low-temperature steam is used as a heat transfer fluid to extract heat energy released by oxidation of the oil shale for power generation, and the method can be used for development of oil gas resources of the oil shale and shale with medium and low maturity.

The invention provides oil shale pyrolysis reaction experimental equipment which comprises a loading chamber arranged on a supporting base plane and internally provided with a cuboid space; the sample loading and unloading module is movably arranged on one side of the loading chamber so as to move the sample into the loading chamber or move the sample out of the loading chamber; the pressure control module comprises four groups of loading hydraulic cylinders arranged on four inner side surfaces of the loading chamber and a pressure head of a press machine arranged above the loading chamber so as to apply pressure to the sample in the loading chamber; the servo pump pressure module is arranged on one side of the loading chamber and is communicated with the interior of the sample in the loading chamber so as to convey high-temperature and high-pressure gas to the interior of the sample; the monitoring module comprises a displacement detection part arranged in the loading chamber and is used for monitoring the displacement of the sample in the loading chamber; the tail gas treatment module is arranged on one side of the loading chamber and communicates with the interior of the loading chamber, and the problem that in the prior art, equipment capable of conducting large-size oil shale in-situ pyrolysis reaction is lacked is solved.

The invention discloses a method for identifying algae bombardment type oil shale based on carbon isotopes and biomarkers, and belongs to the field of testing or analyzing materials by means of measuring chemical or physical properties of the materials.The method comprises the steps that firstly, Soxhlet extraction is conducted on a cleaned, dried and smashed sample, and soluble organic matter and residual rock powder are obtained; separating the soluble organic matter family components to obtain saturated hydrocarbon and aromatic hydrocarbon components; then extracting residual rock powder kerogen, and analyzing carbon isotope; the method comprises the following steps: according to gas chromatography-mass spectrometry biomarker data of saturated hydrocarbon and aromatic hydrocarbon components, obtaining a 4-methylstane index, a ratio of C30 tetracyclic polyisoprene to C27 rearrangement stane and a ratio of phenanthrene series to naphthalene series; and finally, analyzing a parameter correlation relationship, dividing parameter boundaries where different lithologic sample plumbing areas are located, and establishing an algae bomb type oil shale quantitative identification standard based on the carbon isotope and the biomarker. According to the method, scientific, accurate and reliable identification of the algae bombardment type oil shale is realized.

The application discloses a catalytic combustion heater principle prototype, which comprises an air tank, a methane tank, a mixed gas tank and a combustion chamber, the air tank is connected with the mixed gas tank through a connecting pipeline, the gas outlet of the mixed gas tank is connected with the methane tank and the combustion chamber through two connecting pipelines respectively, the top of the combustion chamber is provided with a mixed gas inlet, and a blower is arranged outside the combustion chamber, the application simulates the operation state of the underground catalytic combustion heater, high-temperature tail gas released by catalytic combustion mixed gas is used for heating oil shale layers, so that the oil shale is pyrolyzed to obtain the purpose of exploiting oil and gas, the simulation reference result of the experimental prototype can be understood as the actual operation result, the application not only reduces the exploitation cost of the oil shale in-situ conversion exploitation, but also improves the oil and gas exploitation efficiency, reduces the exploitation cost and reduces the harm of the toxic tail gas generated by incomplete combustion to animals, plants and the environment caused by direct release of the toxic tail gas into the atmosphere.

The invention discloses an oil shale in-situ conversion and carbon sequestration method by injecting high-temperature carbon dioxide and cooperating with sodium capsules, and belongs to the technical field of fossil energy in-situ exploitation and carbon sequestration. The method comprises the following steps: firstly, determining a target development area and formulating a corresponding development strategy; then, the oil shale reservoir is subjected to fracturing transformation; then, the oil shale reservoir is heated, supercritical carbon dioxide is injected, and displacement recovery is conducted; then, sodium capsule suspension fluid is injected into the oil shale reservoir, and solid-phase geological storage is achieved; and finally, after oil and gas exploitation reaches the economic limit, all the injection wells and the production wells are closed, and final geological storage is completed. According to the method, the carbon dioxide geological sequestration technology and the oil shale in-situ conversion process are deeply fused, the oil shale recovery efficiency is remarkably improved, the geological sequestration of the carbon dioxide is synchronously achieved, and the method has important significance in the fields of carbon emission reduction and fossil energy in-situ exploitation.

The invention relates to a desulfurization method of oil shale residues, which comprises the following steps: step 1, crushing the oil shale residues at room temperature, and then carrying out ball milling on the oil shale residues in a ball mill to obtain refined particles; 2, carrying out heat preservation and desulfurization on the refined particles in a muffle furnace; 3, the desulfurized refined particles obtained in the step 2 are soaked in an alkaline solution, then neutralized with an acid solution and finally washed repeatedly with clear water; and 4, drying the refined particles obtained in the step 3. The desulfurization method provided by the invention can effectively reduce the content of sulfur element in the oil shale residues and reduce the harm of the oil shale residues to the environment; the invention further provides cement mortar prepared from the oil shale residues prepared by the desulfurization method, the cement mortar is higher in compressive strength and flexural strength, lower in porosity, higher in density and higher in applicability, the production cost is saved, and the environment-friendly concept of recycling solid waste is met.

The invention discloses a method and system for determining the in-situ limit exploitation depth of oil shale, and the method comprises the steps: measuring the permeability under different depths according to an oil shale sample of an oil shale in-situ region to be evaluated; performing a pyrolysis experiment on the oil shale sample to obtain the composition of each simulated product and the components of each simulated product changing along with the temperature, and fitting a pre-constructed kerogen pyrolysis-based multi-step total reaction model on the basis of the composition and the components, so as to obtain fitted model coefficients and reaction kinetic parameters; predicting a formation temperature field formed on the basis of a heating condition of high-temperature fluid injection in the current formation, and predicting a yield change curve on the basis of the formation temperature field in combination with the permeability at different depths, the model coefficients and the reaction kinetic parameters; and establishing an income prediction model related to the to-be-evaluated oil shale in-situ area, and obtaining the limit mining depth when the income value is zero according to the yield change curve.

The application provides a wellbore safety experiment device and method for electric heating in-situ exploitation of oil shale, and the wellbore safety experiment device comprises a thermal insulation layer, a simulated injection-production assembly arranged outside the thermal insulation layer, and oil shale raw rock, a simulated wellbore assembly, a simulated production pipe column assembly and a first stress collection assembly arranged in the thermal insulation layer. The sealed cavity is heated by an electric heater, heat is transmitted to the oil shale raw rock through the oil pipe, the casing and the closed wellbore, the cracked product of the oil shale raw rock after being heated and cracked flows into the oil pipe through the product channel, the cracked product in the oil pipe is collected through the simulated injection-production assembly, the temperature in the oil pipe is collected through the first temperature sensor, the stress borne by the casing and the oil pipe at different positions is collected in real time through the first stress collection assembly, the real downhole in-situ exploitation process is simulated, the safety of the casing and the oil pipe can be evaluated in advance before downhole exploitation, and the safety and reliability of the casing and the oil pipe during downhole exploitation can be ensured.

The invention relates to a polymer composite material, which contains polymer from 10 to 99 % by weight and residual material remaining from the production of chalk from oil shale ash deposited on the hill from 1 to 90% by weight. Preferably, the residual material left over from the production of chalk from oil shale ash deposited on the hill is pre-ground and the particle diameter is less than 15 μm, preferably 97% of the particle diameter is up to 8 μm.