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.

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.

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 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 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 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.

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.