114 results about "Geothermal reservoir" patented technology

An apparatus and a method is disclosed for storage of solar energy in a subsurface geologic reservoir. The method includes transferring concentrated solar thermal energy to a fluid, thereby generating a supercritical fluid. The supercritical fluid is then injected into the subsurface geologic reservoir through at least one injection well. The subsurface geologic reservoir may be a highly permeable and porous sedimentary strata, a depleted hydrocarbon field, a depleting hydrocarbon field, a depleted oil field, a depleting oil field, a depleted gas field, or a depleting gas field. Once charged with the supercritical fluid, the subsurface geologic formation forms a synthetic geothermal reservoir.

A directional geothermal energy system and method helps to increase control in paths to be taken by geo-fluid flow through hot rock to create engineered geothermal reservoirs and networks to mine heat from hot rock resources. The system uses directional drilling techniques to create a spanning borehole extending between an injection borehole and a production borehole. The spanning borehole typically extends through hot rock for a distance on the order of kilometers to allow the geo-fluid flowing through the spanning borehole adequate transit time and surface contact to obtain sufficient heat given a certain flow rate for the geo-fluid. In some implementations, multiple injection boreholes can supply geo-fluid to a single production borehole. Individual geo-fluid networks can be so sized, shaped, and located with respect to one another to form a collection of geo-fluid networks to mine heat from very large hot rock resources.

The present invention relates to systems and methods of intelligently extracting heat from geothermal reservoirs. One geothermal well system includes at least one injection well extending to a subterranean formation and configured to inject a working fluid into the subterranean formation to generate a heated working fluid. At least one production well extends to the subterranean formation and produces the heated working fluid from the subterranean formation. A production zone defines a plurality of production sub-zones within the subterranean formation and provides fluid communication between the at least one injection well and the at least one production well. Each production sub-zone is selectively accessed in order to extract heated working fluid therefrom and thereby provide a steady supply of heated working fluid to the surface.

Apparatus and methods for recovering and using geothermal energy. Such methods include at least partially vaporizing a working fluid by passing it through a flow loop that at least partially extends into a heated subterranean zone and employing the vaporized working fluid to power a turbine. At least a portion of the flow loop can comprise a depleted or partially depleted hydrocarbon well.

An apparatus and a method is disclosed for storage of solar energy in a subsurface geologic reservoir. The method includes transferring concentrated solar thermal energy to a fluid, thereby generating a supercritical fluid. The supercritical fluid is then injected into the subsurface geologic reservoir through at least one injection well. The subsurface geologic reservoir may be a highly permeable and porous sedimentary strata, a depleted hydrocarbon field, a depleting hydrocarbon field, a depleted oil field, a depleting oil field, a depleted gas field, or a depleting gas field. Once charged with the supercritical fluid, the subsurface geologic formation forms a synthetic geothermal reservoir.

The present invention relates to a method and system for extracting and / or utilizing thermal energy from rock formations. This Abstract is provided to comply with rules requiring an Abstract that allows a searcher or other reader to quickly ascertain subject matter of the technical disclosure. This Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).

The invention provides a building method for an artificial dry-hot-rock geothermal reservoir and belongs to the field of artificial dry-hot-rock geothermal reservoir building. According to the technical scheme, the method includes the steps that supercritical carbon dioxide fracturing is conducted on the soft weak face or an interlayer formed along the igneous rock phase to generate a major crack, then large displacement of hydrofracturing is conducted on the interior of the major crack to generate secondary fracturing, bulk fracturing or cluster type fracturing of a dry hot rock body is generated under cyclic fracturing, and the artificial geothermal reservoir is built. The building method has the beneficial effects that the characteristics of low viscosity and easy diffusion of the supercritical carbon dioxide and the characteristic that the crack is easy to form due to the fact that the fracturing pressure of igneous rock under supercritical carbon dioxide fracturing is low are fully utilized; and in combination with the characteristics that the igneous rock is of the obvious rock phase structure and thermal fracturing is easy to generate, the problems that current hydrofracturing cannot be implemented to building of the artificial geothermal reservoir in a deep rock mass, the fracturing pressure is large, the crack group or the crack band of an ideal structure is difficult to form, and an artificial geothermal reservoir stratum is particularly difficult to build are solved.

The invention discloses a simulation experiment device used for an enhanced geothermal system and a method for evaluating porous sandstone geothermal reconstruction by means of the simulation experiment device. The simulation experiment device comprises a heat exchanger chamber, a prefabricated rock, an electric heating panel, a constant-temperature liquid supply groove, two liquid colleting grooves and horizontal geostress simulation units, wherein an inlet and two outlets corresponding to the inlet are formed in the heat exchange chamber, and the inlet and the outlets all communicate with a cavity; and the prefabricated rock is arranged in the cavity, a first injection shaft, a first production shaft and a second production shaft are further arranged in the prefabricated rock, the injection shaft is located between the first production shaft and the second production shaft, the injection shaft communicates with the inlet, the first production shaft and the second production shaft communicate with the two outlets correspondingly, and preset seams, micro pressure sensors and micro temperature sensors are arranged in the prefabricated rock.

The invention provides controlled-release compositions comprising at least one encapsulating compound and at least one tracer and / or oil-field chemical, wherein the encapsulating compound is in the form of synthetic crystals having inclusions, and wherein said tracer and / or oil-field chemical is encapsulated within said inclusions. The invention further provides methods for the use of such composition including in tracking the flow, pH and / or salinity of at least one fluid within a geothermal reservoir or a reservoir for petroleum production, as well as in monitoring the integrity of cap and other barriers to fluid flow within the reservoir. Methods for the formation of such compositions are also provided.

The invention provides a system for collecting thermal energy from underground deep high-temperature rock with low porosity and low permeability. The system comprises a thermal production well, at least one fracturing well, a full-closed casing pipe, a ground thermal energy utilizing device and a pipeline circulation system, wherein the fracturing wells are located near the thermal production well, meshed cracks are formed in the underground deep high-temperature rock according to a fracturing method, an artificial geothermal reservoir is formed, and a thermal energy collecting section of thethermal production well is partially or wholly wrapped with the artificial geothermal reservoir; and the pipeline circulation system is used for making a heat exchange working medium flow downwards inthe casing pipe along an interlayer and then circulate upwards through a center pipe. With the closed design, matter exchange with the underground environment is avoided, the defects of high energy consumption, needs to reinjection, ground thermal pollution, chemical pollution and ground collapse due to direct use of geothermal water are overcome, and the heat exchange efficiency of a closed deepunderground heat exchange system is improved in an artificial fracturing mode.

The invention relates to an energy conversion system used in an intensified geothermal system with CO2 as a working medium. The energy conversion system is characterized by comprising a ultrahigh-voltage CO2 thermal power generation system and an organic rankine thermal power generation system, wherein endothermic CO2 in a geothermal reservoir is taken as the working medium for the ultrahigh-voltage CO2 thermal power generation system, and heat energy is converted into electric energy through turbine expansion working; and a rankine cycle working medium in the organic rankine thermal power generation system exchanges heat with CO2 subjected to working doing, and the heat energy is converted into the electric energy through a rankine cycle. According to the invention, because the ultrahigh-voltage CO2 thermal power generation system and the organic rankine thermal power generation system are combined in use, the conversion efficiency in converting the heat energy into the electric energy is effectively increased; meanwhile, the heat utilization rate of the geothermal system is increased, long-term sequestration of partial CO2 can be realized, and the emission of the CO2 to the atmosphere is reduced. The energy conversion system disclosed by the invention can be widely applied to the technical field of geothermal power generation.

The invention relates to a dimethomorph-mancozeb water dispersible granule and a preparation method thereof. The dimethomorph-mancozeb water dispersible granule is characterized by comprising the following components by weight percent: 40-65 of dimethomorph, 8-15 of mancozeb, 1-30 of disintegrant, 1-10 of dispersant, 1-10 of wetting agent, 0.1-2 of caking agent, 0.05-0.3 of stabilizing agent and the balance carrier. The preparation method is as follows: the components are weighed by the mixture ratio and are mixed evenly; active ingredient, accessory ingredient and carrier are added to the mixture; master powder is obtained after grinding the formula components in a superfine mode, and the master powder is extruded, prilled, dried and sievedto obtain dimethomorph-mancozeb dispersible granule. The invention overcomes the deficiencies of missible oil harming the environment and powder, has better wetting property, faster disintegration speed, better dispersivity, higher suspensibility, good geothermal reservoir stability and easy use, and is safe to human beings and environment and easy to control the release and the direction finding.

The invention belongs to the field of construction of dry hot rock artificial geothermal reservoirs, and particularly relates to a method for constructing a large-heat-exchange-area artificial geothermal reservoir in a dry hot rock body at low cost and high efficiency through a water pressure blasting fracturing technology for low-porosity and low-permeability deep layer dry hot rock. The method is a new concept for constructing the dry hot rock artificial geothermal reservoir based on a currently-applied huge water pressure fracturing technology. When the artificial geothermal reservoir is constructed through the water pressure blasting fracturing technology, the water pressure needed during rock body fracturing and crack expanding can be effectively increased, the density, length and width of rock body cracks (fractures) are increased, the defect that water pressure fracturing can not provide sufficient required water pressure due to device limitation is overcome, the artificial geothermal reservoir can be constructed at low cost and high efficiency, and the economic benefits of a dry hot rock geothermal development system can be improved.

The invention discloses a deep coal bed gas and dry hot rock type terrestrial heat combined mining method, and belongs to the technical field of geological new energy development. A CO2 injection well is a single-branch horizontal well, a horizontal well section is located in a hot dry rock geothermal reservoir, and 8-10 geothermal exploitation vertical wells are constructed on the ground on the two sides of the horizontal well section; and the CO2 injection well horizontal well section is subjected to staged fracturing and is synchronously fractured with the geothermal exploitation vertical well, so that an artificial fracture channel is formed between the CO2 injection well and the geothermal exploitation well. Lateral drilling of a branch horizontal well is carried out on a straight well section of the CO2 injection well, the lateral drilling horizontal well section is located in the deep coal reservoir, and after drilling is completed, a screen pipe is put down for well completion; and 8-10 coalbed methane mining vertical wells are constructed on the ground on the two sides of the lateral drilling horizontal well section, and a deep coal reservoir is transformed in a fracturing mode after perforation well completion. CO2 is injected into a well for continuous gas injection, the recovery ratio of deep coal bed gas is increased through the replacement and displacement effects of CO2 on CH4, meanwhile, the geothermal energy in the hot dry rock is extracted with supercritical CO2 as a circulating working medium, and the geothermal energy is converted into electric energy through a supercritical CO2 generator.

The invention relates to a completion method of an enhanced geothermal system through communication and circulation of two wells. The completion method is characterized in that when being injected into a water injection well, water is subjected to low-efficiency heat exchange in a straight well section of the water injection and then enters a geothermal reservoir along a horizontal heat collection well, and the water is subjected to sufficient and high-efficiency heat exchange with the geothermal reservoir through a high-temperature-resistant casing pipe and then enters a heat extracting well; high-temperature hot water passes through a heat-insulating protective layer formed by an intermediate casing with the interior and exterior coated with a thermal insulation material in the heat extracting well and then extracted out of the ground, and the extracted hot water is used for generating electricity.

The invention discloses a method for monitoring geothermal reservoir temperature and fracture distribution and a device thereof. According to the method, the temperature distribution of a geothermal reservoir can be obtained by performing one time of measurement through a nanometer tracer, the returned curve can be used for determining time of reaction of a threshold nanometer tracer, then the threshold temperature position of the geothermal reservoir is reversely determined through time, finally the temperature distribution of the geothermal reservoir is determined by combining the response curve of the threshold nanometer tracer and a non-nano tracer, and finally the fracture distribution of the geothermal reservoir is determined according to the number of the threshold nanometer tracer in at least two production wells so that real monitoring of the temperature distribution and the fracture distribution of the geothermal reservoir can be realized, and repeated measurement of the temperature and fracture distribution situation of the geothermal reservoir can also be realized.

The invention provides a sedimentary basin type underground heat resource classification method. The method comprises the steps that 1) tectonic zones of a sedimentary basin are divided by utilizing well drilling, logging, well logging and earthquake data and the like; 2) lithological combination and thickness of the stratum are determined for different tectonic zones; 3) the thermal conductivities of different lithological stratums are made clear via rock core sampling test; 4) shaft temperature measuring data of the tectonic zones is obtained, and distribution of the ground temperature gradient is determined according to the shaft temperature measuring data; 5) the ground heat flow value is calculated by utilizing the thermal conductivities of different lithological stratums and the ground temperature gradient comprehensively via a geothermic formula, and the planar distribution rule of the ground heat flow value is made clear; and 6) sedimentary basin type underground heat resource is classified according to the planar ground heat flow value. The method is highly operable, and can be used to provide more accurate methods and materials for research on geothermal reservoir reasons, evaluation of underground heat resource amount and research on development and utilization area selection of the underground heat resource.

The embodiment of the invention discloses a medium-deep sandstone geothermal horizontal level exploitation method and structure. A horizontal well is built on a sandstone geothermal reservoir, a production well composed of a vertical well and the horizontal well is formed, and finally, the novel technology and method for exploiting and recharging the geothermal generation well are formed; the horizontal well is a single horizontal well or a plurality of parallel horizontal wells; the effective contact superficial area of the drilled well and the reservoir is increased, the exploitation and recharging efficiency is improved, the geothermal well yield is greatly increased, and economic benefits are improved.

The invention discloses a method for transforming an oil field abandoned well into a geothermal well or a brine well. The method comprises the steps that in an oil field exploitation area, an oil field abandoned well with a brine layer below an oil extraction layer or an oil field abandoned well with the bottom boundary of a geothermal reservoir layer 200 m above an oil extraction layer position is selected, a drill pipe drill rig is lowered into an oil layer casing pipe to carry out pigging, and when pigging is smoothly achieved and after it is determined that no abnormal condition exits in the well, the artificial bottom of the well is poured to seal the lower portion oil extraction layer position; a pump chamber section is transformed, and a water drainage pipe is additionally arranged on an exploitation layer; perforation construction is carried out on a technical casing pipe located on the exploited geothermal reservoir layer or the brine layer; a water filtering pipe is lowered into the exploitation layer, and for the transformed geothermal well or the brine well, sand washing well washing is directly carried out, or a water filtering pipe with a sediment pipe on the lower portion is lowered; after well washing, exploitation testing, sampling analysis and acceptance check are carried out. By means of the method, the oil field abandoned well resources are recycled, and the double effects of energy conservation and environment protection, and economic benefits of recycling of the oil field abandoned well resources are achieved.

The invention belongs to the technical field of construction of hot-dry rock artificial geothermal reservoirs, and particularly relates to a method for building a hot-dry rock artificial geothermal reservoir by using natural geological faults. The method comprises the following steps that 1, the occurrences, the number and the sizes of the faults in a hot-dry rock geothermal development area are determined; 2, a well group is arranged and designed along the trend of the target fault, wherein according to the arrangement way of the well group, shafts are linearly arranged in a one-injection-two-return way; 3, an injection well is drilled in the center of the trend of the target fault; 4, in the combination of the geophysical prospecting imaging technology, the macro-size of a large-fault and the azimuthal angle of a drilling hole are determined, and according to the macro-size and the azimuthal angle, the occurrence of the target fault can be precisely determined; 5, the target fault and near fracture zones are used as the fracture development artificial geothermal reservoir which is high in permeability and large in heat exchange area; 6, a lot of room-temperature water is injectedinto the injection well, heat exchange is conducted through the natural artificial geothermal reservoir crack network of the target fault, transformation from solid heat to liquid heat is achieved, and high-temperature water and over-hot water vapor are produced from production wells to be used for electricity generation or heat supply.

The invention provides a stratum deep high-salinity brine exploitation and heat utilization system which comprises an injection well, an extraction well, a CO2 source gathering device, a heat utilization device, a separation device and a recharging device. A closed loop is formed between the CO2 source gathering device, the heat utilization device, the separation device as well as the recharging device and the injection well as well as the extraction well, the bottom of each of the injection well and the extraction well is positioned in a high-salinity brine layer, the CO2 source gathering device is communicated with a wellhead of the injection well, high-salinity brine is extracted out from a wellhead of the extraction well, the wellhead of the extraction well is communicated with the heat utilization device which is communicated with the separation device, and the recharging device is connected with both the separation device and the injection well. By the system, the problems of serious pressure accumulation and salt rock sedimentation can be effectively relieved, and geological storage of CO2 can be realized to slow down weather change; constant pressure of geothermal reservoirs can be maintained, exploitation efficiency of brine and geothermal resources can be greatly improved, geothermal energy can be used for power generation or can be directly utilized, and economic benefit is remarkable.

A rotary shutter valve 500 is used for geothermal reservoir stimulation. The valve 500 includes a pressure chamber 520 for holding a working fluid (F) under pressure. A rotatable shutter 532 is turned with a powering device 544 to periodically align one or more windows 534 with one or more apertures 526 in a bulkhead 524. When aligned, the pressurized working fluid (F) flows through the bulkhead 524 and enters a pulse cavity 522, where it is discharged from the pulse cavity 522 as pressure waves 200. The pressure wave propagation 200 and eventual collapse of the bubbles 202 can be transmitted to a target rock surface 204 either in the form of a shock wave 206, or by micro jets 208, depending on the bubble-surface distance. Once cavitation at the rock face begins, fractures are initiated in the rock to create a network of micro-fissures for enhanced heat transfer.

The invention discloses a method for constructing a hot dry rock artificial geothermal reservoir through cooperation of hydraulic fracturing and millisecond millisecond blasting and belongs to the field of construction of a hot dry rock artificial geothermal reservoir of EGS (enhanced geothermal systems). The method comprises steps as follows: firstly, determining the depth and range of a target layer of hot dry rock; constructing a water injection well and a production well to the target layer of hot dry rock; constructing multiple parallel horizontal drilling holes in the target layer to communicate the water injection well and the production well; producing cracks to a certain degree on the periphery of hole walls in group holes with a sectional hydraulic fracturing technology; later, mounting cartridges in the group holes, and the drilling holes are blasted with a millisecond millisecond blasting technology; and finally, injecting a large amount of normal-temperature water into thetarget layer from the water injection well, performing heat exchange sufficiently through the artificial geothermal reservoir, converting solid heat into liquid heat, and exploiting high-temperaturewater and overheating steam from the production well. The hydraulic fracturing and millisecond millisecond blasting technologies are organically combined, the hot dry rock artificial geothermal reservoir can be constructed to the utmost extent, and the application prospects are broad.

The invention relates to a shaft self-loop heat exchange experiment device and method. The experiment device includes a heat exchange system, an injection and production system, a heating and insulation system and a data acquisition system, wherein the heat exchange system is used for simulating a shaft of a geothermal reservoir and providing a flow channel between a heat-carrying fluid and the geothermal reservoir, the injection and production system is used for injecting the low-temperature heat-carrying fluid into the heat exchange system through a booster pump, collecting the produced hotfluid and cooling and storing the produced hot fluid, the heating and insulation system is used for performing heating and head insulation of the shaft and a sand-filling cylinder to shape the high temperature environment of the geothermal reservoir and simulate stable heat source supply, and the data acquisition system is used for monitoring and recording temperature and pressure data at key locations of the heat exchange system, the injection and production system and the heating and insulation system. The experiment device is advantaged in that the experiment device can simulate the processof circulating flow, heat exchange and heat collection of the heat-carrying fluid in the oil jacket annulus-oil pipe, can monitor temperature and pressure changes along the shaft and at the inlet andthe outlet in the heat exchange process, can analyze thermal property change of the heat-carrying fluid in the shaft and measure the heat exchange rate, heat flux and a heat transfer coefficient of the shaft, and can be used for screening heat-carrying fluids, optimizing injection-production parameters and evaluating factors affecting the shaft heat exchange rate.

The invention discloses a closed circulation well and a development method of dry hot rock. The method comprises the following steps: choosing a target geothermal reservoir stratum, and determining the diameters of a vertical borehole and a branch borehole according to a discharge parameter and a pressure loss parameter; drilling the vertical borehole, and injecting cement paste to carry out wellcementation after enabling a first casing pipe to enter; drilling at least two branch boreholes; injecting the cement paste to carry out the well cementation after second casing pipes enter the branchboreholes; enabling a vacuum thermal insulation pipe to enter, wherein the vacuum thermal insulation pipe is successively connected with a heat exchanger, a circulating pump and a circular space between the vacuum thermal insulation pipe and the casing pipes through a ground pipe complex; and starting the circulating pump, wherein circulating fluid successively passes through the ground pipe complex, the circular space between the vacuum thermal insulation pipe and the casing pipes, the vacuum thermal insulation pipe and the ground pipe complex and then enters the heat exchanger to carry outcircular heat exchange. The method can realize the efficient and continuous exploitation of the dry hot rock at a relatively low cost.

The invention discloses a system for efficiently exploiting geothermal energy in dry-hot rock by means of a heat pipe. The system comprises the geothermal heat pipe, hypertonicity geothermal reservoirs formed in a high-temperature dry-hot rock target area and filled with fluid working mediums, and a heat exchanger and a heat utilization device which are located on the ground. The geothermal heat pipe is provided with heat pipe condensation sections, a heat pipe heat insulation section and a heat pipe evaporation section, wherein the heat pipe condensation sections, the heat pipe heat insulation section and the heat pipe evaporation section communicate sequentially. The heat pipe evaporation section penetrates through the hypertonicity geothermal reservoirs, the heat pipe condensation sections and the heat utilization device conduct heat exchanging through the heat exchanger. According to the system for efficiently exploiting the geothermal energy in the dry-hot rock by means of the heat pipe, the problem that the heat recovery rate of a conventional geothermal heat pipe heat recovery technology is too low is solved. The geothermal energy in the dry-hot rock is exploited through the geothermal heat pipe, and the heat evaporation section of the geothermal heat pipe is arranged in the geothermal reservoirs, by means of the thermal convection effect of the fluid working mediums in the geothermal reservoirs, the heat recovery quantity of the heat pipe is greatly increased, and the economy of the heat pipe mining dry-hot rock geothermal technology is improved.

The invention discloses a loop type heat pipe exploitation middle-shallow layer hydrothermal type geothermal system which comprises a loop type heat pipe, a heat utilization device and a middle-shallow layer groundwater hypertonicity geothermal reservoir. The loop type heat pipe is provided with a loop type heat pipe evaporation section, a loop type heat pipe heat insulation section, a loop type heat pipe condenser and a loop type heat pipe fluid pipeline section which are located in the hypertonicity geothermal reservoir; the loop type heat pipe heat insulation section comprises a steam pipeline section and a heat insulation material layer for tightly wrapping the outer wall of the steam pipeline section; and one end of the loop type heat pipe evaporation section is communicated with one end of the loop type heat pipe fluid pipeline section, the other end of the loop type heat pipe fluid pipeline section is communicated with one end of the steam pipeline section through the heat release side of a heat exchanger, and the other end of the steam pipeline section is communicated with the other end of the loop type heat pipe evaporation section. By means of the loop type heat pipe exploitation middle-shallow layer hydrothermal type geothermal system, the problem about self starting of the overall geothermy exploitation system can be solved; and meanwhile, the heat long-distance transportation can be achieved, the problem of conflicts of steam flow and liquid flow of a tradition heat pipe is solved, and the heat transferring efficiency is greatly improved.

Systems and methods usable to urge a passageway through subterranean strata, place protective lining conduit strings between the subterranean strata and the wall of said passageway without removing the urging apparatus from said passageway, and target deeper subterranean strata formations than is normally the practice for placement of said protective lining conduit strings by providing apparatuses for reducing the particle size of rock debris to generate lost circulation material to inhibit the initiation or propagation of subterranean strata fractures.