422results about "Collector components/accessories" patented technology

The invention discloses an efficient cross-season energy storage energy pile, and relates to the technical field of new energy and energy conservation. The problems that in an existing energy storage system, the thermal load prediction error is large, underground thermal diffusion attenuation is caused, the heat exchange capacity is lowered, and the geological adaptability is insufficient are solved. According to the scheme, an LA mixed time sequence prediction model is adopted to optimize load prediction, a distributed optical fiber temperature measurement array and a finite element inversion algorithm are combined to accurately reconstruct a stratum temperature field, and the geological type is identified based on a support vector machine classifier to realize self-adaptive regulation and control of heat exchange parameters; meanwhile, the heat pump power, the circulating pump frequency and the heat charging and discharging rate of the phase change material are optimized through a depth deterministic strategy gradient algorithm and a gradient heat release strategy; the heat exchange efficiency, the long-term stability and the complex environment adaptability of the cross-season energy storage system are remarkably improved, and the energy-saving effect of a building energy supply system is improved.

The various embodiments described herein include systems and methods for constructing geothermal fields. In one aspect, a system for constructing a geothermal field comprises a coiled tubing. The coiled tubing is configured for drilling one or more boreholes of the geothermal field. The coiled tubing is configured for inserting one or more geothermal loops into the one or more boreholes. The coiled tubing is also configured for grouting the one or more geothermal loop.

The invention relates to a solar cross-seasonal heat storage and release ground source heat pump system and a balance control method and device, and relates to the technical field of ground source heat pump systems. The ground source heat pump subsystem comprises a ground heat exchanger group which is arranged in a partitioned manner; and the cross-seasonal heat storage device is used for storing and releasing solar heat and is thermally coupled with the buried pipe heat exchanger group, the cross-seasonal heat storage device is of an underground concrete structure, and three temperature gradient areas of a high-temperature layer, a medium-temperature layer and a low-temperature layer are arranged in the cross-seasonal heat storage device. Through the synergistic effect of the dynamic load distribution mechanism and the layered heat storage strategy, the problem of soil cold and heat accumulation caused by long-term operation of the ground source heat pump system can be effectively relieved. Differential design of the core heat exchange area and the buffer temperature adjustment area is combined with a multi-objective optimization algorithm, so that the difference value of annual accumulated heat taking capacity and heat supplementing capacity is controlled within 5%, and the self-recovery capacity of the soil thermal field is remarkably improved.

A method of operating a thermal system implementing a ground-source heat pump includes receiving design parameters associated with a design of the thermal system and receiving one or more measurement inputs associated with a flow of a thermal fluid through a borefield of a ground heat exchanger. The method further includes, based on the measurement inputs and the design parameters, predicting one or more predicted thermal values of the thermal fluid using a forward model. The method further includes predicting one or more predicted borefield parameters of the borefield based on inverting the forward model. The method further includes monitoring the thermal system based on the predicted borefield parameters.

Methods and systems are provided for extracting thermal energy from a geothermal reservoir. One aspect involves drilling at least one sidetrack that extends from a primary wellbore and intersects at least one fracture target in the geothermal reservoir. The at least one sidetrack can be configured to increase fluid flow into the primary wellbore from the at least one fracture target. The increase of fluid flow into the primary wellbore from the at least one fracture target as provided by the at least one sidetrack can increase the amount of captured heat from the geothermal reservoir.

The invention relates to the technical field of multi-source data fusion and grid modeling, and discloses a shallow geothermal energy development modeling method, system and equipment based on multi-source data fusion. The method comprises the following steps: performing joint interpolation on shallow geothermal data, engineering geological data and hydrogeological data to generate a virtual drill hole; constructing a ground temperature grid model according to shallow geothermal data, virtual drilling and anisotropic interpolation constraints; performing step-by-step color setting and rendering on the shallow geothermal attribute grade of the geothermal grid model to obtain a visual geothermal grid model; and generating a stepped temperature distribution profile map and a temperature contour line according to the ground temperature grid model so as to display stepped features of temperature distribution. According to the method, the high-precision and high-reliability ground temperature grid model is constructed through multi-source data fusion, virtual drilling generation and anisotropic modeling technologies, and the model not only can generate a stepped temperature distribution profile map and a temperature contour line, but also can improve the geological parameter inversion precision and the thermal reservoir prediction reliability.

The invention belongs to the technical field of terrestrial heat application, and particularly relates to an underground heat removal device. The underground heat removal device comprises a heat exchange unit used for exchanging heat with geothermal water; the outer oil pipe is arranged at the upper part of the heat exchange unit; the inner oil pipe is arranged in the outer oil pipe, the two ends of a first annular space between the inner oil pipe and the inner oil pipe are sealed, and a vacuumizing opening communicated with the first annular space is formed in the outer oil pipe.

The invention relates to the technical field of natural gas hydrate exploitation, in particular to a natural gas hydrate combined exploitation system and method utilizing geothermal energy. An offshore operation platform is used for receiving natural gas hydrate produced by a depressurization exploitation module; the depressurization mining module obtains natural gas hydrates through a depressurization method; the geothermal energy circulation heating module is located in a vertical shaft of the space below the offshore operation platform and provided with multiple layers of heat collection pipes and heat dissipation pipes, the heat dissipation pipes are arranged in the natural gas hydrate reservoir in the depth direction of the heat reservoir, and the heat collection pipes and the heat dissipation pipes are filled with working liquid. The working liquid absorbs geothermal energy in the heat reservoir through the heat collecting pipe, and the geothermal energy is released into the natural gas hydrate reservoir through the heat dissipating pipe. Geothermal energy is used for heating the natural gas hydrate reservoir, depressurization method-thermal excitation method combined mining is formed, and the mining efficiency is improved.

The present application relates to the technical field of cogeneration system optimization, in particular to a heat and electricity decoupling system based on geothermal long-time energy storage and a control method. By constructing a low-temperature underground aquifer energy storage unit (ATES), combined with an electric heat pump unit (EHP) to recover the waste heat of a cogeneration unit (CHP), the CHP is deeply decoupled from heat and electricity through collaborative operation. Through intelligent scheduling strategy, the heat supply ratio is dynamically allocated, the power generation adjustment range of the cogeneration unit (CHP) is improved, the wind power consumption capacity is improved, the wind power curtailment rate is reduced, and it is suitable for centralized heating scenarios with high wind power penetration rate.

The invention discloses multifunctional wellhead equipment for well cluster gathering and transportation and cross-season stratum heat storage. Comprising a heat preservation inner pipe G1, a geothermal circulation water supply pipeline G2, a wellhead equipment main body pipe J2, a geothermal circulation water return pipeline G3, a bypass pipeline G4, a wellhead equipment upper end cover J1, a heat exchange well casing pipe J3, a geothermal circulation water supply pipeline pressure gauge P1 and a geothermal circulation water supply pipeline temperature transmitter T1. The geothermal circulating water supply system comprises a geothermal circulating water return pipeline, a geothermal circulating water return pipeline pressure gauge P2, a geothermal circulating water return pipeline temperature transmitter T2, a heat meter HM, a heat storage small-power circulating water pump WP, a Y-shaped filter V1, an energy valve V2, a geothermal circulating water return pipeline valve V3, a blow-down valve V5, a geothermal circulating water return pipeline control butterfly valve V6, a sight glass V7, a bypass pipeline bypass valve V8, a geothermal circulating water supply pipeline control butterfly valve V9 and a geothermal circulating water supply pipeline. And the heat storage circulating water pump bypasses a control valve V10. Accurate flow transmission and distribution of multiple heat exchange wells, fluid parameter monitoring, water quality observation and flexible sealing of temperature measurement optical fibers can be achieved, and stable change of the fluid flow speed is ensured.

The geothermal well structure comprises the structural fissure strip-shaped heat reservoir, a heat taking well and a recharge well, and the lower end of the heat taking well and the lower end of the recharge well communicate with the structural fissure strip-shaped heat reservoir; the n geothermal wells are arranged along the tectonic inclination side of the tectonic fissure strip-shaped heat reservoir, and the heat extraction wells and the recharge wells are arranged at intervals or the recharge wells are arranged at intervals of two heat extraction wells. The invention provides a feasible technical scheme for efficient development and utilization of geothermal resources for constructing strip-shaped heat storage.

A system and method of using a subterranean energy storage system includes a geothermal reservoir with at least one fracture configured to hold a working fluid for a period of time. At least one wellbore is positioned within the geothermal reservoir fluidly coupled to the at least one fracture. At least one pump is configured to at least one of a) inject the working fluid into the at least one fracture and b) withdraw the working fluid from the at least one fracture. A power system is fluidly coupled to the wellbore, the power system configured to convert at least one of a) a thermal energy of the working fluid and b) a fluid dynamic energy of the working fluid into an electrical current. A downhole pressure of the working fluid held in the at least fracture for the period of time increases during the period time.

A system includes a power unit, and a coiled tubing (CT) reel for spooling a CT string. The system includes a CT injector for injecting the CT string from a surface into a subsurface to construct a geothermal borehole. The CT injector includes a gooseneck for guiding the CT string into a body of the CT injector. The system includes a first arm for coupling the CT reel and the power unit. The system includes a second arm for coupling the CT injector and the power unit. The system is configured to modify the distance between the CT reel and the gooseneck by adjusting at least one of (i) the length of the first arm or (ii) the length of the second arm.

Methods and systems for geothermal energy production wherein multiple horizontal or vertical wells may be used to pass fluids through the Earth from an injector well to a producer well through induced cracks, splits, fractures, conduits, or channels in the rock. Such methods and systems may include controlling tensile-split conduits in a subterranean geothermal formation by providing an injection well, providing a production well, configuring the injection well for injection of a tensile-splitting fluid into a production zone, configuring the production well to produce a heated fluid from the production zone, applying pressure to the production well, creating a plurality of tensile-split conduits, raising or lowering the pressure in the production well, establishing fluid communication between the injection well and the production well, and producing the heated fluid to the surface.

A method of operating a ground-source heat pump (502) includes generating a thermal power based on a thermal communication of the ground-source heat pump (502) with a borefield (508), the thermal power at least partly covering a thermal load of a facility. The method includes receiving a temperature associated with the borefield (508) and controlling the thermal power based on the temperature. The method further includes maintaining the temperature within a temperature range based on controlling the thermal power, wherein the ground-source heat pump (502) is configured to cause the temperature to fall outside of the temperature range at a full capacity of the thermal power.

The invention provides a deep geothermal coaxial heat exchange system based on a reducer pipe and a branch structure, and relates to the technical field of energy exploitation. The system is composed of ground energy supply and control equipment, a geothermal well and an underground heat exchange pipe network, the underground heat exchange pipe network is arranged in the geothermal well and comprises a first casing pipe, a second casing pipe, a third casing pipe and a branch pipe, and the first casing pipe, the second casing pipe and the third casing pipe are sequentially in butt joint and communication; the first annulus channel, the second annulus channel and the third annulus channel form a cold water injection channel, the inner diameter of the first casing pipe is larger than that of the second casing pipe, and the inner diameter of the second casing pipe is larger than that of the third casing pipe; the first central pipe, the second central pipe and the third central pipe are sequentially butted and communicated to form a hot water backflow channel, and the inner diameter of the first central pipe is larger than that of the second central pipe. According to the technical scheme, the heat exchange contact area of the fluid and the stratum can be increased, the heat exchange efficiency is improved, and meanwhile coordinated matching of the injection-production flow and the heat exchange capacity is achieved.

A groundwater heat exchanger includes a distributor, a collector, a plurality of heat exchange pipes, and a housing. The distributor includes a first interior chamber and a first port. The collector includes a second interior chamber and a second port. Each heat exchange pipe includes a first end attached to the distributor and a second end attached to the collector, and defines a fluid passageway between the first and second interior chambers. The housing surrounds the heat exchange pipes and defines a groundwater passageway along the heat exchange pipes that is configured to receive a groundwater flow. In one example, a loop fluid flow received at the first port flows into the first interior chamber, then flows from the first interior chamber to the second interior chamber through the plurality of heat exchange pipes, and flows from the second interior chamber out the second port.

The invention discloses a geothermal heat supply system and method, and the system comprises a ground source side which comprises a geothermal source, a heat exchanger and a three-way valve; the geothermal source is connected with the heat exchanger through a ground source side pipeline; moreover, a three-way valve is arranged in the ground source side pipeline, an inlet of the three-way valve is connected with the water outlet end of the geothermal source, a first outlet of the three-way valve is connected with the primary side water supply and return end of the heat exchanger, and a second outlet of the three-way valve is connected with the primary side water supply end of the heat exchanger. The heat exchange amount of the heat exchanger is controlled; the ground heat exchange side comprises a heat pump unit; the heat pump unit is connected with a ground source side pipeline; and the tail end supply side is connected with the heat pump unit and receives the circulating medium flowing out of the heat pump unit. According to the scheme provided by the invention, load decoupling, flow decoupling, pressure slow change and system stability among the ground source side, the ground heat exchange and extraction side and the end user side can be realized.

The invention provides a multi-energy cooperative closed geothermal heating system, which relates to the technical field of renewable energy sources and comprises a closed geothermal circulating unit, a multifunctional cooperative unit and a control unit. The geothermal circulation unit achieves working medium circulation heat absorption through the injection well, the production well and the underground heat exchange structure embedded in the rock mass. The cooperation unit is provided with an industrial waste heat loop, an electric heating heat storage loop and a heat pump unit which are connected in parallel, the primary side of a heat pump is in closed-loop connection with the production well and the injection well, and the secondary side communicates with a user heat supply pipeline. The control unit realizes two modes through path switching: in a heating mode, the heat pump unit raises the temperature of a geothermal working medium and is linked with the electric heating loop to supply heat together, and industrial waste heat supplements heat energy synchronously; and in the heat storage mode, the heat pump and the electric heating are closed, and the industrial waste heat working medium is reversely injected into the production well for geothermal heat storage. The heat taking efficiency of the closed type geothermal heating system and the heat source supply stability can be both considered.

The invention discloses a tail water recharge system of a middle-deep geothermal well and a working method, and particularly relates to a recharge well, a vacuum breaker, a flowmeter, a control system, a remote monitoring device, a steady flow tank, an impurity filtering device, a vacuum detection device and a temperature control device. According to the tail water recharge system of the middle-deep geothermal well and the working method, the vacuum breaker is additionally arranged in the recharge well, so that the problem of negative pressure generated in the recharge process is effectively solved, a vacuum column is prevented from being formed in a heating system, the heating effect is improved, the geothermal dynamic monitoring work is simplified, and the working efficiency is improved. The vacuum breaker is arranged so that tail water can be smoothly recharged into a heat storage layer, the situation that air enters a recharge system is avoided, the quality of the tail water is kept, a recharge channel is prevented from being blocked, the recharge efficiency is improved, complex equipment such as a sand remover, a filtering tank and an exhaust tank does not need to be arranged, the system structure is simplified, and the system cost is reduced. And meanwhile, the recharge efficiency is improved.

The invention discloses a circulating heat collecting method and system for a branch horizontal well. The circulating heat collecting method for the branch horizontal well comprises the steps that the branch horizontal well is drilled; an injection pipe is put into the vertical well section, so that an extraction channel is formed between the injection pipe and the wall surface of the vertical well section; a packer is installed at the lower end of the injection pipe so that the extraction channel and the horizontal well section can be sealed and separated; hydraulic fracture forming is carried out on the wall face of the vertical well section above the packer, and volume fracture net fracture forming is carried out on the wall face of the upper side of the horizontal well section, so that a volume fracture net is communicated with a hydraulic fracture; after the heat recovery fluid is injected into the injection pipe, the two ends of a first heat exchange channel of a heat exchange driving device communicate with the upper end of the recovery channel and the injection pipe correspondingly; the heat of the hot dry rock reservoir can be exchanged to the heat storage medium flowing through the second heat exchange channel of the heat exchange driving device, so that the heat collection area is increased, and the heat collection efficiency is improved.

The present invention relates to systems and methods for monitoring microseismic activity in a geothermal well system using fiber optic sensing technology. The system includes fiber optic cables installed in multiple wells of the geothermal well system. The fiber optic cables enable simultaneous collection of distributed acoustic sensing (DAS) data, strain measurements, and temperature data. By detecting and localizing microseismic events during stimulation and operation of the geothermal well system, seismic activity is maintained within safety thresholds, providing for safe and effective extraction from the geothermal well system.

A geothermal heat extractor includes a heat transfer fluid and a heat transfer fluid supply conduit. The heat transfer fluid is maintained in the supply conduit in a liquid state at a pressure above its saturation pressure. The geothermal heat extractor further includes a heat transfer fluid return conduit, a geothermal heat source coupled thereto, at least one flow control valve configured to control the flow of the heat transfer fluid from the supply conduit to the return conduit, and an external load coupled to the return conduit. As the heat transfer fluid is provided to the return conduit in the liquid state, the heat transfer fluid vaporizes in the return conduit by heat supplied to the return conduit from the geothermal heat source. The vaporized heat transfer fluid is supplied from the return conduit to the external load.

A geothermal system obtains heated heat transfer fluid via heat transfer with an underground reservoir of magma. The geothermal system includes a wellbore extending between a surface and into the underground reservoir of magma. A fluid pump provides a flow of heat transfer fluid toward the underground reservoir of magma. A fluid conduit extends from the surface toward a terminal end of the wellbore and allows flow of heated heat transfer fluid from a portion of the wellbore that extends into the underground reservoir of magma toward the surface.

The invention discloses a pipe-following-while-drilling energy pile. The pipe-following-while-drilling energy pile comprises a pipe-following-while-drilling pile body, a heat accumulator, a heat transfer medium, a heat transfer medium conveying system, a valve system and a heat exchange unit; the while-drilling pipe-following pile body is a hollow cylinder, the outer side face of the while-drilling pipe-following pile body is connected with peripheral soil through a cementing material, a sealed cavity is formed by the bottom and the inner side face of the while-drilling pipe-following pile body, and a grouting guide pipe is arranged in the side wall of the while-drilling pipe-following pile body. The heat accumulator is arranged in the closed cavity of the while-drilling pipe pile body; the heat exchange unit comprises a compressor, an evaporator, a condenser, an expansion valve and a pipeline system. The heat exchange unit is configured to achieve heat exchange between heat in the pile body and heat on the user side. The heat transfer medium conveying system is configured to communicate one or more while-drilling pipe pile bodies, and a fluid channel of the while-drilling pipe pile body, the valve system, the heat exchange unit, the valve system and the while-drilling pipe pile body is formed. The invention further discloses a construction method of the pipe-following-while-drilling energy pile. The energy pile and the construction method thereof are high in construction efficiency and heat exchange efficiency.

The invention relates to the technical field of geothermal energy development and utilization, and discloses a multi-well cooperative enhanced heat exchange method for medium-deep layer geothermal energy waterless exploitation. According to the method, an inverted-cone-shaped heat conduction network comprising a center main heat collecting well, an auxiliary heat conduction well array and a temperature-sensitive phase change heat conduction bridging grouting area is constructed. During operation, a low-temperature working medium is injected into the central well to reduce the temperature of the grouting area to be below the phase change temperature, phase change shrinkage of the microcapsules is triggered, the high-thermal-conductivity filler is induced to make contact with one another, a thermal-conductivity seepage network is constructed, and the thermal conductivity of the grouting area is converted into an enhanced state from a ground state. The auxiliary heat conduction well gathers far-field heat and transmits the far-field heat to the center well according to the gravity assisted heat pipe principle. According to the invention, the microstructure evolution of the material is driven by using a temperature field, the self-adaptive adjustment of the heat conductivity is realized, the heat removal volume is obviously enlarged, the heat loss of the shaft during the non-operation period is reduced, the geothermal energy exploitation efficiency is improved, and the reverse loss of the heat of the working medium in the shaft to the stratum during the non-operation period is reduced.

The invention discloses an ultra-long gravity heat pipe geothermal energy development system containing underground fluid channeling layer enhanced heat transfer, and belongs to the field of geothermal energy underground enhanced heat transfer. High-temperature fluid flows into a shallow aquifer from a deep aquifer through the annular channel between the geothermal well and the heat pipe, vertical flow is formed in the geothermal well, and the fluid comes from a high-temperature rock stratum, so that on one hand, the heated high-temperature fluid can provide a large amount of heat, and on the other hand, heat supplement can be carried out on the rock stratum; in addition, the heat exchange capacity outside the heat pipe can be effectively improved through flowing of fluid in the geothermal well, so that the efficient heat collection performance of the heat pipe system is achieved, in addition, the fluid entering the shallow stratum can form a low-temperature zone in the upper stratum, heat in the deep stratum can be transmitted to the shallow stratum faster, and the heat collection efficiency is improved. Therefore, the average temperature difference between the heat pipe evaporation section and the rock stratum is improved, and the heat collection performance of the system is further improved.

A multi-parameter integrated test system for deep geothermal in-situ power generation is provided, including an evaporation interval, an insulation interval and a condensation interval respectively defined on a tube body, where a thermoelectric module arranged on the evaporation interval and configured to generate output electric energy; the working medium generates liquid-gas-liquid phase change movement along the direction from the evaporation interval to the condensation interval to drive an internal generator to generate electricity; and the system is equipped with a variety of parameter measuring sensors.

A valve assembly suitable for use in a high temperature well, such as a geothermal well. The valve assembly comprises a tubular housing having ports to allow fluid communication between a fluid passageway in the valve assembly and the outside of the valve assembly, an outer sleeve longitudinally slidable in the tubular housing, and an inner sleeve longitudinally slidable in the outer sleeve. The outer and inner sleeves are slidable to various positions to prevent, allow or restrict flow through the ports. The valve assembly may include sealing assemblies that can withstand high temperatures, frangible plugs in the ports that can be sheared to open the ports, and / or a coupling member for coupling the inner and outer sleeve while the ports are being opened. The valve assembly may have ports configured in a manner that allows for sequential opening of the ports.

The invention discloses a terrestrial heat collecting system and a construction and use method thereof, the terrestrial heat collecting system comprises a plurality of prefabricated terrestrial heat energy piles, an expansion cavity space is formed below each terrestrial heat energy pile, and the expansion cavity spaces are filled with circulating water for terrestrial heat exchange; a circulating water cavity is formed in the prefabricated geothermal energy pile, a heat exchange mechanism used for conducting heat exchange between the circulating water cavity and the expanded cavity space is arranged in the prefabricated geothermal energy pile, and the heat exchange mechanism comprises a heat exchange pipe located in the circulating water cavity and a heat exchange net located in the expanded cavity space. A release mechanism used for releasing the heat exchange net after construction of the energy pile is completed is arranged in the prefabricated geothermal energy pile; according to the prefabricated geothermal energy pile, the heat exchange structure is integrated into the prefabricated geothermal energy pile, and the energy pile can serve as a structural component and a heat exchange component, so that additional drilling or excavation for mounting a ground source heat pump system is not needed, and the land cost and the mounting cost are saved.