165results about "Collector components/accessories" patented technology

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.

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 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.

A geothermal system exchanges heat between ground which receives geogenic heat 1 from below and a target 7, comprises a continuous loop of heat exchange tubing 3 placed in a region of the ground and s

The invention discloses an injection-production linkage control method based on well-ground multi-domain data, belongs to the technical field of injection-production monitoring and control, and can solve the problem that in the prior art, fusion perception of underground-ground multi-source information, second-level abnormity early warning and linkage intelligent control of injection-production parameters cannot be achieved at the same time. The method comprises the following steps: S1, determining a state feature vector of a to-be-measured well in a corresponding sampling period according to collected underground sensing data and ground sensing data; s2, determining a risk index of the to-be-measured well in the current sampling period according to the state feature vectors of the to-be-measured well in different sampling periods; s3, constructing a return function of the to-be-measured well in the current sampling period according to the state feature vector and the risk index of the to-be-measured well in the current sampling period; and S4, solving a return function of the to-be-measured well in the current sampling period, and controlling the injection-production action of the injection-production equipment of the to-be-measured well in the next sampling period according to the solved optimal control strategy. The method is used for injection-production linkage control.

A system and method are provided for installing a well for a borehole heat exchanger. The method includes drilling a hole formation to a predetermined depth relative to a ground surface, including operating a bottomhole assembly (BHA) including a drill bit supported at a bottom end of a cable positioned within a flexible tube. After drilling the hole formation to a predetermined depth, the BHA is retracted through the flexible tube to remove the BHA from the hole formation while the flexible tube remains in the hole formation.

The invention provides a hydrothermal geothermal well bore structure and a well completion method, and the structure comprises an intelligent management and control system which comprises a hierarchical control module, a distributed monitoring network and a performance evaluation unit. The hierarchical control module, the distributed monitoring network and the performance evaluation unit form closed-loop control of parameter acquisition, data analysis and regulation and control execution through a preset logic interaction link; the well body structure comprises a main well section, a branch well section and a multi-ring enhanced heat exchange unit, the main well section and the branch well section are in sealed communication through a directional butt joint component, the multi-ring enhanced heat exchange unit is arranged around the tail end of the branch well section, and the tail end of the branch well section is further provided with a functional heat collecting assembly matched with a heat storage layer. According to the invention, a core management and control layer of the hierarchical control module plans a global strategy as a whole, and a partition control layer performs directional regulation and control according to an efficient / balanced / emergency mode and executes a driving layer landing physical action; the whole section of the distributed monitoring network covers three types of monitoring nodes of environment, structure and performance.

This layout (12) comprises at least one heat exchange unit (24) comprising: - at least one central well (26) extending from the surface of the subsoil (22); - at least one flank well (28) extending from the surface of the subsoil (22) and having an inclined lateral portion (48); - at least two separate drains (30) connecting the central well (26) and the inclined lateral portion (48) of the flank well (28). For the or each heat exchange unit (24), the central well (26), the flank well (28) and each drain (30) are set out in the one same vertical plane, the intersections between the drains (30) and the central well (26) and between the drains and the inclined lateral portion (48) being separated from one another and the drains (30) opening inclined by an angle less than 45° with respect to the inclined lateral portion (48).

The invention relates to a same-well extraction and irrigation method and system for an L-shaped well. The system comprises at least one well group, each well group at least comprises two L-shaped wells arranged at intervals, and well pipes are arranged in the L-shaped wells; the at least one heat compensation system is matched with the well group; the control device is arranged corresponding to the well group, the heat supply input end is connected with the water outlet end of the L-shaped well, the heat supply output end is connected with a lower-stage unit, the heat compensation input end is connected with the heat compensation system, the heat compensation output end is connected with the well pipe, and the control device is configured to decide the working mode of the L-shaped well in the same group and the regulation and control state of the well pipe based on the heat supply output end and the water outlet temperature of each well. The method specifically comprises the steps of judging the working mode and the recovery mode of the L-shaped well, selecting the recovery mode and adjusting the water outlet flow. The collecting modules are arranged at the water outlet ends of the L-shaped wells and the heat supply output end of the control device. Through well group binding, real-time monitoring and intelligent regulation and control, parallel heat collection and recovery are achieved, and heat supply continuity and energy recycling are guaranteed.

The invention discloses a coaxial sleeve type water body heat storage system and method based on a vertical shaft of a shut-off and retreat mine. A coaxial sleeve with a deep inner part and a shallow outer part is mounted in the center of a top sealing well cover of the vertical shaft which is sealed by a sealing and filling section; the outer pipe and a well wall annulus form a cement sheath which is matched with a casing hanger to share the weight of the casing; a one-way valve and a perforated screen pipe are arranged at the specific depth of the inner pipe to form a two-way heat storage adaptive assembly. According to the method, natural rebound underground water serves as a medium, a high-temperature heat source heat storage mode and a low-temperature heat source heat storage mode are switched according to the relation between the heat storage heat source temperature and the original ground temperature of the top face of a shaft sealing and filling section, in the non-heating season, water is pumped through an outer pipe for heating and then recharged for heat storage, in the heating season, reverse circulation heat release heating is conducted, and the low-temperature mode can synchronously provide summer cold loads. The method adapts to the large-diameter and large-depth characteristics of a shaft, large-scale cross-season heat storage is achieved, mine remaining resources are fully utilized, the heat storage cost is reduced, the method adapts to various heat sources, the space-time intermittency of renewable energy sources is relieved, and green and low-carbon transformation of closed and retreated mines is promoted.

The disclosure provides a connection device for supply and return lines of heat transfer fluid of a geothermal probe. The connection device includes an inlet connection designed to connect to a supply line of heat transfer fluid, and an outlet connection intended for a return line. It features a first tubular portion connected to the inlet connection and a second tubular portion connected to the outlet connection. Additionally, a third tubular portion is connected to either the first or second tubular portion. The first tubular portion includes a tubular bending section that connects to the second tubular portion, forming a tubular U-shape, allowing fluid to flow from the inlet through the first and second tubular portions to the outlet. The first tubular portion extends longitudinally beyond a central transversal plane located centrally between the inlet connection and the outlet connection. The third tubular portion acts as a tubular appendix to the U-shape. The connection device is formed as a single piece. The disclosure also provides a method for forming the aforementioned connection device in a single step, preferably through injection moulding using a mould with a collapsible core.

A wellbore is drilled in a subterranean zone with a drill bit of a drilling string. The drilling string includes tubing and a fluid separator uphole of the drill bit. While drilling, a drilling fluid is flowed through an interior of the drilling string and through the fluid separator. The fluid separator separates, from the drilling fluid, a fluid stream having a higher water-to-oil ratio than a remainder of the drilling fluid Uphole of the drill bit, the fluid stream is diverted from the fluid separator to an annulus around the exterior of the drilling string based on a specified temperature of a drilling string component while the remainder of the drilling fluid flows from the fluid separator to the drill bit.

A geothermal device and method for reconstruction of abandoned oil and gas wells. The geothermal device comprises a heat exchanger arranged at the wellhead of an abandoned oil and gas well and an unpowered heat extractor located inside the abandoned oil-gas well, wherein the unpowered heat extractor comprises a thermal insulation member and an evaporation member; the heat exchanger, the thermal insulation member and the evaporation member are sequentially in communication with each other from top to bottom; a liquid working medium is injected into the unpowered heat extractor, absorbs heat from a crude oil layer and evaporates into a gaseous working medium; the gaseous working medium is sequentially transported through the evaporation member and the thermal insulation member to the heat exchanger, condenses in the heat exchanger to release heat and turns into the liquid working medium; and the liquid working medium flows back to the bottom of the abandoned oil and gas well under the action of gravity. The present invention achieves true "heat extraction without water extraction", and does not require a water pump during operation, thereby reducing operation costs.

A system and method are provided for installing a well for a borehole heat exchanger. The method includes drilling a hole formation to a predetermined depth relative to a ground surface, including operating a bottomhole assembly (BHA) including a drill bit (108) supported at a bottom end of a cable (118) positioned within a flexible tube (104). After drilling the hole formation to a predetermined depth, the BHA is retracted through the flexible tube to remove the BHA from the hole formation while the flexible tube remains in the hole formation.

A method includes determining a specified demand over time for thermal energy from a heat exchanger of a heat pump. The heat pump is configured to transfer thermal energy from a geothermal working fluid circulating in a closed loop geothermal well to the heat exchanger. The closed-loop geothermal well includes a first ground wellbore extending from a land surface to a geothermal subsurface; a second surface wellbore extending from the land surface to the geothermal subsurface; and a plurality of connection wellbores connecting the first surface wellbore to the second surface wellbore. The heat output of the heat exchanger is controlled by adjusting at least one of the flow or inlet temperature of geothermal working fluid in the closed loop geothermal well to meet specified requirements.

Drilling in a wellbore in a subterranean zone with a drilling string including a coiled tubing. The coiled tubing having a bulk, length normalized radial thermal resistance to heat transfer through a wall of the tubing of at least 0.008 m K / W. Flowing a drilling fluid through the drilling string while drilling, where a ratio of a drilling string bulk density to a drilling fluid bulk density is 2 or less.

The invention relates to the field of geothermal energy storage, and discloses a cross-seasonal rock-soil heat storage system based on multi-source waste heat and intelligent regulation and control, comprising a physical layer comprising a rock-soil heat storage body; a multi-source waste heat access and pretreatment unit; a buried heat exchange pipe network; the intelligent energy allocation unit is connected with the underground heat exchange pipe network and the multi-source waste heat access and pretreatment unit; the information and control layer comprises a multi-physical field sensing network which is arranged in the rock-soil heat storage body; the digital twin and multi-physics field coupling simulation engine is connected with the multi-physics field sensing network; and the intelligent decision-making and dispatching center is connected with the physical layer communication and digital twinning and multi-physics field coupling simulation engine. A geological stress health degree index is introduced as a key quantitative index, and a digital twinning and multi-physics field coupling simulation engine is utilized to perform real-time calculation and look-ahead safety check, so that potential structural damage can be foreseen and avoided, and the structural safety and operation reliability of the system are improved.

A thermal reach enhanced geothermal wellbore is provided. The geothermal wellbore includes a wellbore extending from a topside surface to a target location in a formation. The geothermal wellbore further includes a plurality of fissures that distally extend from the target location into the formation and that are at least partially filled with a compacted high-thermal k material. The compacted high-thermal k material terminates on a proximal end at the target location of the wellbore and is thermally coupled to a high-thermal conductivity grout or slurry through which heat is conducted to a working fluid that is contained in a closed loop working fluid conduit embedded in the grout or slurry.

The invention belongs to the technical field of geothermal resource monitoring, and discloses a system for observing the recharge rate of a geothermal well, which comprises a main control unit and a data acquisition module, a man-machine interaction module and a communication module which are connected with the main control unit. The data acquisition module synchronously acquires flow, temperature and pressure data of the mining well and the recharge well. The main control unit firstly analyzes pressure-flow velocity long-time covariance, temperature-flow velocity medium-time response and flow velocity instantaneous stability to comprehensively calculate a reliability index of flow data; and physical rule verification is executed, and when the monitored value is inconsistent with the trend reflected by the pressure and the temperature, the equipment fault is judged. Calculating a stage recharge rate based on high-reliability data, if the stage recharge rate does not reach the standard, carrying out intelligent diagnosis, and if the data reliability is low or equipment failure exists, giving an alarm to indicate that the measurement is abnormal; if the data are reliable, an alarm is given to indicate suspected illegal mining or blockage of the recharge well. According to the invention, the data credibility and the supervision accuracy are improved, and the intelligent positioning of the abnormal source is realized.

A geothermal power system generates electricity using a geothermal fluid. The geothermal fluid is produced from, and then injected into, fractures in a subterranean formation such that pressures inside the fractures are maintained between the corresponding closure pressures propagation pressures of the fractures. In some aspects, the fractures are devoid of proppant, and are maintained open by the pressure of the fluid within the fractures.

Wellbore for extracting heat from magma and a corresponding method. The method includes the steps of drilling a borehole from a surface and towards a magma chamber; supplying a drilling fluid to an interface between a drill bit and a terminal end of the borehole during drilling; terminating the drilling in response to the borehole achieving a predetermined depth; and supplying a thermodynamic fluid into the borehole to maintain the borehole while completing the wellbore. The drilling fluid lifts cuttings out of the borehole and quenches magma to form a solid phase material that can be cut by the drill bit.

A groundwater heat exchanger includes a plurality of heat exchange pipes, a housing and a cable channel. Each of the heat exchange pipes is configured to receive a loop fluid flow. The housing has an interior chamber that contains the heat exchange pipes and defines a groundwater passageway that is configured to receive a groundwater flow. The cable channel is formed on an exterior of the housing and extends along a central axis of the housing. The cable channel includes at least one cable pathway configured to receive one or more cables.

A wellhead container for a geothermal system includes a base configured to engage a bottom of a recess within a ground. The recess extends vertically from the bottom of the recess to a surface of the ground, the base includes at least one first opening, and the at least one first opening is configured to receive a drilling string. The wellhead container includes a top configured to support a load applied by a drilling machine to the wellhead container. The top includes second openings, and each second opening is configured to receive the drilling string. The wellhead container includes a sidewall extending along a vertical axis between the base and the top. The sidewall is configured to position an upper surface of the top substantially flush with the surface of the ground, and the sidewall is configured to transfer at least a portion of the load to the base.

A comprehensive geothermal energy development and utilization system capable of storing heat across seasons relates to the field of energy development and utilization, in the system, a three-layer nested structure of a buried pipe, a phase change sleeve and a rock-soil body is adopted, the phase change sleeve provides structural support through an annular elastic framework layer and is tightly attached to the buried pipe through a flexible sealing layer, and the phase change sleeve is tightly attached to the rock-soil body; segmented connection is achieved through the flexible connecting ends. According to the structural design, the phase change sleeve can effectively adapt to the volume change of the phase change material in the phase change process, and structural failure is avoided; meanwhile, the flexible sealing layer is in sealing contact with the outer wall of the buried pipe, so that the heat transfer contact resistance is reduced, and the heat exchange efficiency is improved; in addition, due to the modular design that the phase change sleeves are arranged in a segmented mode in the axial direction, installation and later maintenance of the system in a geothermal well are facilitated.

The invention belongs to the technical field of geothermal energy development and CO2 resource utilization, and provides a geothermal energy development system and method with a bionic capillary network cooperating with CO2 expansion acting, CO2 heating-expansion-fracturing synchronization is achieved through the bionic capillary network structure, and the reservoir transformation and heat energy extraction effect is enhanced; through a well pair type circulation structure, a stable and communicated artificial fracture network is formed between the two horizontal wells, and cross-well flowing and continuous heat removal of CO2 in a reservoir are achieved; high-temperature and high-pressure supercritical CO2 and circulating water are simultaneously conveyed to a ground heat exchange and power generation device after being subjected to underground collaborative heat exchange, geothermal energy and CO2 expansion energy are subjected to combined conversion, generated electric energy is preferentially used for driving a CO2 compression and circulating water system to operate, and a closed circulation mode of heat energy gradient utilization and system energy self-sustaining is constructed. The process significantly reduces the dependence of the system on external energy.

A method performed on a wellbore system with a first surface wellbore extending from a terranean surface to a subterranean zone, a second surface wellbore extending from the terranean surface to the subterranean zone and a plurality of connecting wellbores in the subterranean zone each connecting the first and second surface wellbores. A lateral wellbore is drilled using a drill string extending through the first surface wellbore. While drilling, flow of drilling fluid from the drill string is sealed against returning towards the first surface wellbore through the connecting wellbores.

The invention relates to a method of designing an enhanced geothermal system and characterising at least one fracture in an enhanced geothermal system. The enhanced geothermal system comprises at least one well combination of at least one injector well and at least one production well. The method comprises forming at least one stage fracture from at least one well of the well combination according to a fracture treatment design and injecting at least one tracer into the at least one stage fracture. The method comprising circulating fluid from at least a first well to at least a second well of well combination via the at least one stage fracture; wherein the circulated fluid carries at least one circulation tracer and collecting samples of fluid from at least one well and analysing tracer concentrations with respect to sampling time. The method comprises calculating at least one fracture characteristic from the analysis of the tracer concentrations.

A method for drilling a geothermal well in a subterranean zone includes drilling, with a drill string, a wellbore of the geothermal well in the subterranean zone. An inherent temperature of the rock adjacent a rock face at a downhole end of the wellbore is at least 250 degrees Celsius. While drilling, a drilling fluid is flowed at a temperature at the rock face such that a difference between the inherent temperature of the rock adjacent the rock face and the temperature of the drilling fluid at the rock face is at least 100 degrees Celsius.

The method includes circulating a heat transfer working fluid in a closed loop between a geothermal well present in a subsurface region and at least one of a heat exchanger or a turbine, the well being substantially sealed to limit fluid loss of the working fluid to the subsurface region, and while circulating the working fluid, at least one of a viscosity of the working fluid or a pressure differential between the working fluid and the subsurface region is controlled in association with fluid flow between the subsurface region and the geothermal well.