77results about "Geothermal energy generation" patented technology

The application discloses a geothermal caprock evaluation modeling method and belongs to the technical field of geothermal resource exploration. In view of the problems that existing caprock evaluation standards are uneven, subjective and lack of quantitative coupling of structural factors and calibration of measured data, the application firstly acquires caprock physical properties and structural data; secondly, a single-factor evaluation model based on physical mechanism is constructed for lithology, thickness, permeability and thermal conductivity; on this basis, a structure-mechanical-integrity coupling model is constructed, which includes basic structure scores, fracture risk indexes and plastic self-repairing capacity factors; finally, by using observation data such as historical breakthrough pressure and leakage events, key parameters in the above model are calibrated through regression and Bayesian methods. The method forms a unified and portable caprock evaluation basic model system, reduces subjectivity, and improves the stability and interpretability of the evaluation results.

The application provides a tunnel high-temperature heat disaster advanced geological detection method and system based on heat source inversion, and the application uses "rock wall + borehole" multi-view combined observation to extract two kinds of collected temperature data to form a new sequence, carries out inversion interpretation on the sequence, constructs a three-dimensional heat source inversion target function and an inversion equation based on least square, and solves the inversion equation; forms a heat source and temperature field imaging result map of high-temperature heat disaster detection in a survey area range according to the solving result, realizes effective positioning and capturing of high-temperature heat sources, divides high-temperature heat disaster grades, evaluates heat disaster risk, and provides a reference basis for determination of a tunnel design and a construction scheme.

The invention relates to a photo-thermal coupling terrestrial heat power generation device. The photo-thermal coupling terrestrial heat power generation device comprises a photo-thermal assembly, a power generation assembly coupled with the photo-thermal assembly through a first heat exchanger and a terrestrial heat assembly coupled with the photo-thermal assembly through a second heat exchanger. The geothermal assembly comprises a sleeve inserted into the target stratum and a heat insulation pipe arranged in the sleeve, and an annular space communicated with the power generation assembly is formed between the sleeve and the heat insulation pipe. Wherein the photo-thermal assembly is constructed to be capable of transmitting heat to the power generation assembly and the geothermal assembly through the first heat exchanger and the second heat exchanger respectively, so that the geothermal assembly conveys a heated heat-conducting medium to a target stratum through an annulus; therefore, the geothermal assembly can convey the heat-conducting medium at the target stratum to the power generation assembly when the heat transferred to the power generation assembly by the photo-thermal assembly is smaller than the heat required by the power generation assembly. Therefore, an underground aquifer or other geological structures can be used as an energy storage medium, the energy storage period is prolonged, the operation cost is reduced, and the continuity and stability of power generation are effectively improved.

The application discloses a kind of faulted dissolution body reservoir oil well producing depth acquisition method, device, equipment and medium.Faulted dissolution body reservoir oil well producing depth acquisition method includes: obtaining the temperature well testing monitoring data of target faulted dissolution body reservoir oil well;Temperature well testing monitoring data is handled, and actual temperature well testing interpretation curve is obtained;Temperature well testing model of target faulted dissolution body reservoir oil well is constructed, and the theoretical temperature well testing interpretation curve corresponding to multiple heat transfer distances is obtained based on temperature well testing model;Comparative analysis actual temperature well testing interpretation curve and theoretical temperature well testing interpretation curve, the heat transfer distance corresponding to the theoretical temperature well testing interpretation curve most matched with actual temperature well testing interpretation curve is determined as the producing depth of target faulted dissolution body reservoir oil well.Using the present application can reduce the uncertainty of faulted dissolution body reservoir producing depth calculation, improve the accuracy of producing depth calculation.

The utility model belongs to the ground source heat well construction technical field, concretely relates to a modularization ground source heat well well wall support structure, including a plurality of casing, the casing lateral wall left and right symmetry is from top to bottom and is set with a plurality of recess, all be provided with support subassembly in the recess, a plurality of casing are mutually butted, the casing lateral wall all are provided with pumping unit. Support subassembly includes movable plate that is movably connected in recess lateral wall near the middle part, the movable plate lateral wall is provided with locking piece, the recess lateral wall is located the bolt that is screwed on movable plate upside. The locking piece includes the stud that is screwed in movable plate lateral wall, the recess lateral wall is set up two threaded holes away from movable plate, the stud is matched with threaded hole. The utility model can be fast with the casing under the position of a section of position after drilling and digging certain depth, prevent the well wall from being affected by the flow or the soil quality and cause the collapse, effectively support the well wall.

The application provides a controllable rotary screw drill tool, which comprises a shell, a power spindle concentrically arranged in the shell and capable of rotating relative to the shell, the power spindle being provided with a first central flow channel, and a spline groove extending along an axial part being arranged on an inner wall of a lower end of the power spindle; an output spindle for connecting a drill bit, the output spindle being arranged at a lower end of the power spindle and provided with a second central flow channel, and a spline capable of being matched with the spline groove being arranged on an outer wall of an upper end of the output spindle; wherein in a first state, the controllable rotary screw drill tool can be lifted off a bottom of a well, so that the output spindle is separated from the power spindle, and thus a power motor is separated from the drill bit to perform directional measurement; in a second state, the output spindle and the power spindle can be connected through the spline and the spline groove to form a connection, so that the power motor drives the drill bit to rotate, and thus drilling operation can be directly performed after directional measurement without drilling.

The application discloses a system and method for auxiliary coal and heat co-mining based on heat pipe effect, which comprises an overburden layer, a coal seam and a water-heat type geothermal reservoir from top to bottom, and a water storage pool, a water pumping pump, a buffer tank and a ground heat exchanger are arranged on the overburden layer; a roadway is excavated along a coal mining face in the coal seam, a vertical shaft is arranged in the overburden layer, and a water injection pipeline and a water return pipeline are arranged on two opposite side walls of the vertical shaft and the roadway respectively, the upper end of the water injection pipeline is connected with the ground heat exchanger, the water injection pipeline is connected with a booster through a first power circulation pump after entering the roadway, the underground pipeline output from the booster is continuously laid along the bottom, side and top of the roadway, the tail end of the underground pipeline is connected with the water return pipeline, the upper end of the water return pipeline is connected with the ground heat exchanger, and the underground pipeline, the water injection pipeline and the water return pipeline are provided with heat exchange medium. The application can realize efficient mining of the coal seam and geothermal resources, reduce the environmental temperature of the coal mining shaft roadway and achieve the effect of treating the heat damage in the underground mine.

The application provides a multi-scale perturbation enhanced coaxial type middle-deep geothermal heat exchanger, which comprises an outer sleeve pipe, an inner return pipe and a perturbation module, the inner return pipe is arranged in the outer sleeve pipe, a gap exists between the outer wall of the inner return pipe and the inner wall of the outer sleeve pipe, the gap is an annular gap flow channel, the perturbation module comprises a plurality of main guide vanes, a V-shaped guide vane array and a micro convex point array, the V-shaped guide vane array comprises a plurality of V-shaped guide vanes, the V-shaped guide vane array is located downstream of the main guide vanes, the micro convex point array comprises a plurality of convex points, and the micro convex point array is arranged in the leeward area of the main guide vanes and the V-shaped guide vane array.

The application discloses a kind of loose coal body thermal property coefficient measurement method and system of exothermic oxidation stage, this measurement method experiment constructs temperature field, determines the loose coal body exothermic heat source term of coal body under high temperature oxidation (70 DEG C above) condition, when the boundary condition of measurement and calculation model function is consistent, the temperature rise curve of measuring point;Then construct thermal property parameter calculation model function and golden section search calculation model, measure the thermal diffusivity of loose coal body.The measurement method and system of the application are high in degree of automation, and the measurement result is reliable and stable, easy to operate;It comprehensively uses finite difference equation and golden section search algorithm, and introduces heat source term, eliminates the influence of self-heating of coal body in oxidation environment on thermal diffusivity test, improves the measurement accuracy and efficiency;Convenient for engineering application, the algorithm is packaged by program, and the calculation result can be obtained by inputting corresponding parameters.

The present application relates to the technical field of pipeline engineering, and particularly relates to a ground source heat pump buried pipe lowering assembly, which comprises a U-shaped pipe, further comprises a righting unit, the righting unit is provided with a plurality of righting units and is uniformly connected to the U-shaped pipe, the righting unit comprises two righting parts which are symmetrically distributed and detachably connected to the U-shaped pipe, at least two anti-floating parts are connected to the righting part, and a lifting part for changing the state of the anti-floating part and the righting part is connected to the anti-floating part. The righting unit can guide and protect the U-shaped pipe during the process of lowering the U-shaped pipe into the buried pipe hole, avoid the collision or friction between the U-shaped pipe and the wall of the buried pipe hole, and prevent damage, and the righting unit cooperates with the traction unit, so that the automatic centering function of the U-shaped pipe and the anti-floating function of the U-shaped pipe can be realized by only one drive, thereby reducing equipment investment and operation and maintenance costs.

The application provides a method and device for evaluating fault-controlled geothermal reservoir resources, and the method comprises the following steps: obtaining the element content of soil on the surface of an exploration area and the element content in water samples; determining the heat source element content, the channel element content, the caprock element content and the reservoir element content according to the element content of soil and the element content in water samples; and evaluating the fault-controlled geothermal reservoir resources of the exploration area according to the heat source element content, the channel element content, the caprock element content and the reservoir element content. The application identifies and selects soil elements closely related to four elements, i.e. heat reservoir, caprock, channel and heat source, in fault-controlled geothermal exploration, and uses soil element indexes and parameters to identify and evaluate the properties of fault-controlled geothermal high-temperature, medium-temperature and low-temperature resources, so as to determine the favorable area of geothermal heat source and heat reservoir.

The application provides a deep disaster and energy mine heat cooperative development method based on stress induction and water pressure compensation, which comprises the following steps: demarcating a target block in a deep to-be-developed ore body, obtaining multi-field parameters of the target block, and constructing a multi-physical field coupling three-dimensional numerical model; according to the obtained model and identification results, constructing an induction project in the target block to form a pre-crushed area with initial damage in the target area; based on the formed pre-crushed area, constructing a supplementary drill hole to communicate and expand the rock mass fracture, and forming a three-dimensional geothermal extraction fracture network with high permeability; arranging a fracture network formed by connecting the injection well and the production well, and based on water pressure compensation, the high-temperature fluid is collected into the production well and lifted to the surface; after the high-temperature fluid is lifted to the surface, the heat energy is extracted and utilized; and the ore body of the target block is mined after the rock mass of the target block is extracted by geothermal extraction. The application initiatively triggers the directional and controllable release of high ground stress, eliminates the risk of dynamic disasters such as rock burst from the root, and greatly reduces the blasting energy consumption of subsequent mining operations.

This application relates to the field of geothermal energy development and utilization technology, and in particular to a method, equipment, medium, and product for determining the impact of groundwater runoff on the heat exchange efficiency of buried pipes. The method includes: determining the Pelet number of each borehole; receiving test results from thermal response tests conducted on multiple boreholes, and calculating the heat transfer coefficient set for each borehole under each operating condition based on the test results; wherein the operating conditions include a cooling operating condition and at least two heating operating conditions; selecting effective operating conditions from multiple operating conditions based on the Pelet number and the heat transfer coefficient set corresponding to the effective operating conditions; performing data fitting based on the Pelet number of multiple boreholes and the heat transfer coefficient set corresponding to the effective operating conditions to construct an evaluation model characterizing the impact of groundwater runoff on the heat exchange efficiency of buried pipes and determining the critical Pe value, so as to guide the engineering installation of buried pipe heat exchangers through the evaluation model and the critical Pe value. This application can quantify the impact of groundwater runoff on the heat exchange efficiency of buried pipes.

The invention discloses a method, device and equipment for quantitatively characterizing a formation heat convection effect and a storage medium, and the method comprises the following steps: determining a layered interface of an upper formation and a lower formation according to an obtained ground temperature gradient; determining the actually measured surface heat flow of the upper stratum according to the average ground temperature gradient of the upper stratum and the harmonic heat conductivity of the upper stratum; pure heat conduction surface heat flow is determined according to the average ground temperature gradient of the lower stratum, the blending heat conductivity of the lower stratum and radioactive element heat production of the upper stratum; and determining a heat convection value of the stratum according to the actually measured surface heat flow of the upper stratum and the pure heat conduction surface heat flow. The method aims at solving the problems that in an existing method, complexity of a stratum structure is not considered, and accurate quantitative analysis is lacked, the stratum heat convection effect is quantitatively represented through steady-state temperature data and accurate stratum in-situ thermophysical properties, and the more accurate and comprehensive quantitative analysis effect is achieved.

A system and method for harnessing geothermal energy using fracturing of hot rock. The system has at least a first well and a second well. The method involves introducing an alkali metal downhole in a first well. A solution is also introduced into the first well. The solution produces an exothermic reaction with the alkali metal. The gas and heat fracture the hot rock producing fractures. The fractures fluidly connects the first well to the second well. A solution, such as water, can be pumped through the first well, through the fractures, and into the second well. The hot rock passes geothermal energy to the water which can then be utilized.

A system and process for direct lithium extraction from geothermal brines, and more particular to the sequential combination of a geothermal plant (200), a direct lithium extraction circuit (400), a lithium chloride concentration and purification circuit (600), and a lithium battery chemical processing circuit (800), for the production of lithium hydroxide monohydrate, lithium carbonate or both from geothermal brines. The processing circuits are powered by the electricity and heat produced by the geothermal plant without the use of carbon-based fuels. Non-condensable gases that may come out of solution from the geothermal brine are not emitted into the atmosphere.

A system and method for in ground heat exchange, including at least one first array and one second array, each first and second array comprising a plurality of capped pipes; at least one temperature sensor; and at least one flow rate sensor, a plurality of flow rate valves connected to each first array and second array, the flow rate valves configured to facilitate flow of a liquid through the system; at least one pump attached to the flow rate valves for modulating the flow rate of the system; and a heat pump, wherein the system is configured to provide heating and cooling to a building.

The application provides a dry hot rock enhanced geothermal system completion pipe column and method, and belongs to the technical field of dry hot rock development. The completion pipe column comprises a main wellbore pipe column, an injection branch wellbore pipe column and a production branch wellbore pipe column which are respectively connected with the main wellbore pipe column, and the production branch wellbore pipe column is located above the injection branch wellbore pipe column. The application connects a bridging sub between two packers, realizes that the annular injection water (liquid) is injected into the lower injection branch wellbore through the bridging sub, flows into the production branch wellbore through the reformed fracture, and is produced to the wellhead through the center oil pipe, which is beneficial to maintaining the maximum temperature of the produced water. The water flow enters the production branch wellbore from the injection branch wellbore, the water flow overcomes the influence of gravity, and heat exchange is more sufficient.

This invention relates to the field of brine drainage technology for salt caverns, and provides a wellbore structure for brine drainage from salt caverns, comprising at least: a gas injection well located above the salt cavern and extending from the surface into the salt cavern; a first row of brine wells located above the salt cavern and extending from the surface to the bottom of the salt cavern, with drill pipes installed in the first row of brine wells; and a second row of brine wells located outside the boundary of the salt cavern and extending from the surface beyond the bottom of the salt cavern, with the well body of the second row of brine wells extending towards the first row of brine wells so that the drill pipes at least partially extend into the second row of brine wells. In this wellbore structure for brine drainage from salt caverns, the first and second rows of brine wells are designed with vertical alignment, wherein the second row of brine wells is located at the edge of the salt cavern and extends towards the first row of brine wells via a double-angle drilling method, forming a connection with the first row of brine wells. This allows for the complete drainage of brine from the salt cavern, increasing the gas storage space.

The utility model discloses a kind of geothermal buried pipe heat exchangers. Protective structure includes the protective shell for protecting heat exchanger body, the lower end of protective shell is equipped with the limiting seat for supporting heat exchanger body, limiting seat includes limiting disc, the upper end of limiting disc is equipped with the pressure relief groove for the surface of protective shell is relieved. The utility model is relieved by the setting of protective structure, when soil extrusion protective shell, the external pressure of protective shell is increased, extruded soil can be moved to the both sides of protective structure by connecting hole, inclined hole one and inclined hole two, soil enters pressure relief groove by inclined hole two, reduce the pressure of protective shell to soil, so that protective shell is not prone to deformation, and then effectively protect heat exchanger body.

The present application provides a kind of geothermal energy prediction method based on multi-source data, it is related to geothermal energy exploration technical field, the present application is by in target area according to preset grid scale carries out regular grid division, and with grid center point synchronous acquisition ground temperature observation value and ground heat flow observation value, utilize minimum-maximum normalization method to standardize multi-source observation data, construct two-dimensional feature vector reflecting geothermal characteristic state, realized the fusion and space standardization processing of multi-source data, based on the feature vector difference of non-boundary grid in grid array, adopt the automatic calculation of spatial feature gradient using Euclidean distance criterion to determine edge recognition threshold, filter spatial mutation area as edge candidate point, and further combined with spatial eight connectivity analysis, remove isolated distribution edge candidate point, obtain spatial continuous and physically reasonable boundary point set, using region growing algorithm to expand geothermal distribution area realizes the recursive generation of geothermal distribution area.

Various examples are provided related to airlift pumping of downhole geothermal fluids. In one example, an airlift system includes a compressor; a gas sparger head in a wellbore of a geothermal well, and a pressure head recycle assembly. The sparger head produces artificial lift of the geothermal fluids by injecting a gas resulting in a difference in density downhole. The entrained gas can be extracted by the pressure head recycle assembly, compressed, and reinjected downhole. The geothermal fluid at the well head can be used in direct use applications or in a thermodynamic cycle to make shaft power. The gas sparger head can include a venturi shaped passage extending through the gas sparger head and a bubble orifice including gas orifices radially spaced about a narrow portion of the venturi shaped passage. The gas orifices can have a corresponding resonant chamber through which the gas (e.g., air) is provided.

This invention belongs to the field of buried pipe backfilling technology, and relates to a backfilling structure and layout method for medium-deep buried pipes with axial variable thermal conductivity. The backfilling structure consists of an upper insulation section, a middle transition section, and a lower high-efficiency heat exchange section arranged sequentially from the surface to the well bottom. The depth range of each section increases sequentially, and the average thermal conductivity of each section increases sequentially. The layout method includes: obtaining and modeling basic parameters, establishing a material library and parameterizing, constructing and solving an optimized model, interpreting the scheme, and designing segments. This invention can effectively suppress thermal short-circuiting at the wellhead, significantly enhance deep heat extraction, improve system performance, and extend the sustainability of geothermal fields. Therefore, this invention reduces thermal disturbance in shallow strata, is conducive to the thermal recovery of the rock and soil, and can slow down the performance degradation rate of the system during long-term operation.

This invention provides an energy pile structure based on CFRP-reinforced geotextile bag grouting technology, belonging to the field of building construction technology. The energy pile structure includes: a core hollow steel-concrete composite core, an extended steel pipe section, an outer reinforced concrete component, a heat pump exchange pipe component, a CFRP-reinforced heat transfer network, and a geotextile bag. This energy pile structure enables rapid pile casting in karst areas, especially in environments with significant silt and soil blockage in the underlying karst caves. It can quickly penetrate the mud layer while ensuring the geotextile bag is not easily damaged, forming a pile structure with strong load-bearing capacity. Simultaneously, combining the geotextile bag grouting technology and the characteristics of CFRP fabric, it also enables rapid exchange of heat pump exchange pipes with external geothermal energy, significantly improving geothermal energy conduction efficiency and providing a better option for the development of geothermal renewable clean energy in the karst regions of southwestern my country.

A closed well loop is provided for a geothermal system. The closed well loop includes at least one well having at least one lateral section the traverses a subterranean formation. Fluid flow in the at least one lateral section extracts thermal energy from the subterranean formation. The fluid flow in the at least one lateral section is driven by convection where hotter fluid convects upward along the top part of the lateral section and colder fluid convects downward along the bottom part of the lateral section.

The application discloses an energy tunnel segment and a construction method thereof, and belongs to the technical field of tunnel construction, and solves the problems of complex structure and complicated connection of a tunnel segment in the prior art; the energy tunnel segment comprises a segment body, a connecting plate assembly is arranged in the segment body, and adjacent segment bodies are connected through the connecting plate assembly; heat exchange pipes are arranged in the segment body, and connecting head assemblies are arranged at the ends of the heat exchange pipes; the connecting head assemblies are connected with the heat exchange pipes in adjacent segment bodies; and a heat preservation layer is connected to the inner side of the segment body; in the application, connecting plates are designed to connect two adjacent segment bodies; the connecting plates are pushed along the strip-shaped sliding grooves until the ends of the connecting plates are embedded into segment connecting female grooves of adjacent segment bodies, so that the two segment bodies can be connected; the connecting mode is simple to operate, and the connecting strength is high after connection; and after connection, the connected segment is limited by a connecting limiting assembly, so that the reliability of segment connection is ensured.

The application discloses a device for exploiting dry hot rock geothermal energy based on seawater working medium and a mounting method thereof. The device comprises a geothermal energy collecting assembly, a steam generator, a steam power generation assembly, a condenser and a heat exchange assembly. The steam generator is connected to the geothermal energy collecting assembly, the steam power generation assembly is connected to the steam generator, the condenser is connected to the steam power generation assembly, the heat exchange assembly is used for absorbing the heat energy of the geothermal layer, one end of the heat exchange assembly is connected to the condenser, the other end of the heat exchange assembly is connected to the steam generator, and a control system is electrically connected with the geothermal energy collecting assembly, the steam generator, the steam power generation assembly, the condenser and the heat exchange assembly. The working medium after power generation is recycled, direct discharge of the working medium after power generation is avoided, the power generation capacity of the steam power generation assembly is improved, and the economic benefit of the dry hot rock exploitation is improved.

This invention provides a well completion operation casing connection repair device, tubing string, and method, belonging to the field of well completion technology in oil and gas exploration and development. It includes an insertion tool, a tubing packer, a removable ball seat, and a sealing plug; the tubing packer, removable ball seat, and sealing plug are connected sequentially. The lower part of the insertion tool is located inside the tubing packer and extends to the removable ball seat, connecting with it. This invention uses the insertion tool to insert the tubing packer, removable ball seat, and sealing plug to the position of the return sleeve on the tailpipe hanger. At this time, the sealing plug cooperates with the return sleeve on the tailpipe hanger to form a seal. A pressure ball is thrown into the wellhead, landing on the ball seat of the removable ball seat. Pressure is then applied at the wellhead, achieving the setting and sealing functions of the tubing packer, realizing annular isolation between the casing and oil well, and meeting the requirements of subsequent well completion operations. This invention can also realize the retrieval of the insertion tool and the full-bore requirements after retrieval.

This invention discloses an integrated fracturing and production tubing string for open-hole horizontal wells and its application method, solving problems such as poor segmentation and sand control effects, and complex operation processes. The device includes a central tubing string and a tool string. The central tubing string includes a top packer, a first sealing cylinder, a quick connector, multiple filling production assemblies, a locking sealing assembly, and a float shoe assembly. Adjacent filling production assemblies are connected via an open-hole packer. Each filling production assembly includes a circulating sleeve, a first double-layer screen, a production sleeve, a second double-layer screen, a second sealing cylinder, a filling sleeve, and a positioning clamp. The tool string includes a top setting tool, a test sealing rod, a reconnection rod, a reconnection tool, a filling control tool, a filling sleeve closing tool, a positioning tool, a filling sleeve switching tool, a circulating sleeve single-closing tool, a circulating sleeve single-opening tool, a positioning sealing rod, and a shearing sleeve. This invention enables effective segmentation, sand control, and selective production in oil wells.

The application discloses a continuous pipe well control equipment connecting device and a use method thereof, wherein the device comprises an upper connecting head, a guide component, a lower connecting head, a hydraulic lock assembly and a state indicating component; the upper connecting head comprises an upper head body, the upper head body is provided with a first accommodating hole in the axial direction, the guide component is arranged at the upper end of the lower connecting head, the lower connecting head comprises a lower head body, the lower head body is provided with a second accommodating hole matched with the lower end of the upper head body in the axial direction, one end of the hydraulic lock assembly is connected with the lower head body, and the state indicating component is arranged at the other end of the hydraulic lock assembly. The state indicating component of the application can remotely judge that the connecting device is in a locked connection or a detachable disconnection state, can be used for high-altitude remote quick connection between well control devices during operation, and reduces the risk of close installation and disassembly operation of an operator during the installation and connection process.