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Energía geotérmica

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LastUpdate Última actualización 20/04/2024 [07:51:00]
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SYSTEM AND METHOD FOR INSTALLING A GEOTHERMAL PROBE OF A GEOTHERMAL HEAT PUMP BELOW THE EARTH'S SURFACE

NºPublicación:  WO2024080871A1 18/04/2024
Solicitante: 
RENEWABLE ENERGY DRILLING B V [NL]
RENEWABLE ENERGY DRILLING B.V
WO_2024080871_A1

Resumen de: WO2024080871A1

The invention relates to a system (100) and method for installing at least one geothermal probe (200) of a geothermal heat pump below the Earth's surface. The system (100) comprises a drilling tube (101), a drilling device (102) connected to the at least one drilling tube (101) and configured for drilling at least one bore hole, which drilling device (102) comprises a mud motor (103) and a drilling head (104), wherein the drilling tube (101) is configured to provide drilling fluid to the drilling device (102) and configured for the provision of grout into the bore hole.

Systems for Generating Energy from Geothermal Sources and Methods of Operating and Constructing Same

NºPublicación:  US2024125304A1 18/04/2024
Solicitante: 
RODA ENERGY CORP [CA]
Roda Energy Corporation
US_11933278_PA

Resumen de: US2024125304A1

The present disclosure describes a system and a method for generating energy from geothermal sources. The system includes an injection well and a production well extending underground into a rock formation, a first lateral section connected to the injection well and a second lateral section connected to the production well, the first and second lateral sections connected with a multilateral connector, defining a pressure-tested downhole well loop within the rock formation and in a heat transfer arrangement therewith. The downhole well loop cased in steel and cemented in place within the rock formation. The downhole well loop to receive working fluid capable of undergoing phase change between liquid and gas within the downhole well loop as a result of heat transferred from the rock formation. The system also includes a pump to circulate working fluid, a turbine system to convert the flow of working fluid into electricity, and a cooler.

ROCK STRATUM FRACTURING METHOD AND EQUIPMENT USING VARIABLE-FREQUENCY PULSE FRACTURE NETWORK

NºPublicación:  WO2024077842A1 18/04/2024
Solicitante: 
CHINA UNIV OF MINING AND TECHNOLOGY [CN]
XUZHOU USURE MINING TECH CO LTD [CN]
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\u5F90\u5DDE\u4F51\u5B66\u77FF\u4E1A\u79D1\u6280\u6709\u9650\u516C\u53F8
WO_2024077842_A1

Resumen de: WO2024077842A1

A rock stratum fracturing method and equipment using a variable-frequency pulse fracture network. The fracturing method comprises: first, determining an initial pulse pressure peak of each rock stratum according to the physical and mechanical properties and the confining pressure of each rock stratum, and determining a pulse frequency of each rock stratum according to a collision force measurement experiment for each rock stratum; then, according to the initial pulse pressure peak and the pulse frequency, designing a fracturing pumping scheme using a variable-frequency pulse fracture network, and according to different operating conditions, designing a rock stratum fracturing drill hole arrangement scheme using a variable-frequency pulse fracture network; and finally, according to the drill hole arrangement scheme, punching a fracturing hole, and performing fracturing according to the fracturing pumping scheme. The rock stratum fracturing equipment using a variable-frequency pulse fracture network comprises a pumping-mode-variable and frequency-variable fracturing pump (4), a hydraulic fracturing measurement and control instrument (13), an automatic packer (21), a mechanical rod feeding machine (19) and a two-way water injection steel pipe (20). By means of the rock stratum fracturing method and equipment using a variable-frequency pulse fracture network, a plurality of annular fracture network structures can be formed near a drill hole from near to far and stage by stage, an

Textiler Erdwärmetauscher sowie Verfahren zur Herstellung und Verwendung eines textilen Erdwärmetauschers

NºPublicación:  DE102022210763A1 18/04/2024
Solicitante: 
ITP GMBH GES FUER INTELLIGENTE TEXTILE PRODUKTE [DE]
ITP GmbH Gesellschaft f\u00FCr Intelligente Textile Produkte

Resumen de: DE102022210763A1

Die Erfindung betrifft einen textilen Erdwärmetauscher (30) umfassend ein von einer flexiblen Beschichtung (20) fluiddicht umschlossenes dreidimensionales flächiges Abstandsgewirk (10), wobei das Abstandsgewirk (10) zur Aufnahme eines Wärmetauschfluids eingerichtet ist und wobei in die flexible Beschichtung (20) mindestens zwei zur hydraulischen Verbindung des Abstandsgewirks (10) mit je einem Fluidkanals eingerichtete Anschlusselemente (40) fluiddicht eingearbeitet sind. Ferner betrifft die Erfindung ein Verfahren zur Herstellung eines textilen Erdwärmetauschers und eine Verwendung eines textilen Erdwärmetauschers.

THERMAL ENERGY STORAGE AND METHOD FOR CONTROLLING A THERMAL ENERGY STORAGE

NºPublicación:  EP4352440A1 17/04/2024
Solicitante: 
HYDROC ENERGY STORAGE AB [SE]
Hydroc Energy Storage AB
CA_3221904_PA

Resumen de: CA3221904A1

The invention relates to a thermal energy storage having a fluid source comprising one or more primary boreholes (110; 210; 311, 312, 313; 411, 412, 413; 511; 611; 711; 811; 911) extending from ground level to a predetermined depth in a rock body; and one or more secondary boreholes (120; 220; 751;851; 951) located remote from the fluid source. At least an upper and a lower fracture plane (P1, P2, P3) intersects the one or more primary boreholes (110; 210; 311, 312, 313; 411, 412, 413; 511; 611; 711; 811; 911) and said secondary boreholes (120; 220; 751;851; 951), which fracture planes (P1, P2, P3) permit a hydraulic flow of fluid between the primary borehole and at least one of the secondary boreholes (120; 220; 751;851; 951). The fluid source comprises a well system comprising at least two wells (311, 312, 313; 431, 432, 433; 531, 532, 533; 631, 632, 633; 731; 831, 832, 833; 931) where each well is in fluid communication with one or more fracture planes; and where at least one sealing element positioned to prevent hydraulic flow between wells. The hydraulic flow in each well is controllable to permit a hydraulic flow of fluid between one or more primary boreholes (110; 210; 311, 312, 313; 411, 412, 413; 511; 611; 711; 811; 911) and at least one of the secondary boreholes (120; 220; 751; 851; 951) in at least one fracture plane (P1, P2, P3). (Fig.1)

A GROUND SOURCE HEAT PUMP SYSTEM

NºPublicación:  EP4352424A1 17/04/2024
Solicitante: 
SENERA OY [FI]
Senera Oy
WO_2022258874_PA

Resumen de: WO2022258874A1

This invention relates to a ground source heat pump (GSHP) system comprising: a borehole (1, 2) drilled in the earth; a suction pipe (3) mounted in the borehole (1); and a pump (4) mounted in the borehole (2), the pump (4) having a suction opening (5). In the invention the pump (4) has been mounted above the suction pipe (3); a pump housing (7) has been arranged around the pump (4) so that a space remains between the pump (4) and the pump housing (7); the pump (4) has been arranged to suck water from the suction pipe (3) to the space between the pump (4) and the pump housing (7) and further upwards to the suction opening (5) of the pump (4) and via the pump (4) and a pressure side pipe (8) up to the ground level; between the pump housing (7) and the borehole (2) wall, which is bedrock or pipe sunk into the bedrock, a space has been arranged for the downwards flowing water; and that the pump (4) can be lifted from the borehole (2) without the suction pipe (3).

一种稠油油藏热采后注CO2提取地热能并实现CO2埋存的方法

NºPublicación:  CN117888867A 16/04/2024
Solicitante: 
中国石油大学(华东)
CN_117888867_PA

Resumen de: CN117888867A

本发明涉及一种稠油油藏热采后注CO2提取地热能并实现CO2埋存的方法,井组由两口井筒互相平行的水平井组成;方法包括:对稠油油藏采用蒸汽辅助重力泄油技术进行开发,先实施启动预热,建立泄油通道后进入重力泄油阶段,通过上部水平井将蒸汽注入油藏并与油藏中的流体发生热交换提高原油的流动性,在重力和压力的作用下将原油由下部水平井采出;为提高原油采收率采用二氧化碳驱油,结束热采后向油藏中转注二氧化碳,同时可提取和利用采出流体携带的地热能;关闭下部水平井,仅通过上部水平井注入二氧化碳至预设压力,实现二氧化碳埋存量最大。

一种间膨式PVT辅助地源热泵系统及运行方法

NºPublicación:  CN117889583A 16/04/2024
Solicitante: 
西安交通大学
CN_117889583_PA

Resumen de: CN117889583A

本发明公开了一种间膨式PVT辅助地源热泵系统及运行方法,该系统包括PVT热电联供模块,用于利用太阳能并输出电能和热能;地热能模块,用于其余模块与地热能的热量交互;热泵机组模块,用于利用地热能向用户供热与供冷模块提供热能或冷却能;辅助制热模块,用于利用余电向土壤灌热或向储热水箱储热;用户供热与供冷模块,用于向末端供热和供冷。本发明通过规划设计PVT阵列与热泵机组的间接连接,将PVT阵列输出的热能灌入土壤,降低太阳能间歇性对系统性能的影响;此外,精细化计量土壤热交换量对土壤温度的影响,并考虑地埋管阵列根据季节和负荷状况的分区运行,保持地热能的可持续性,从而保证PVT辅助地源热泵系统高效稳定运行。

深埋管能源桩模型试验装置和试验方法

NºPublicación:  CN117888587A 16/04/2024
Solicitante: 
吉林建筑大学
CN_117888587_PA

Resumen de: CN117888587A

本发明公开了深埋管能源桩模型试验装置及试验方法,其特征在于,包括:水平工作台,设置在X方向上,其上可滑动地设置有水平管模型箱,所述水平管模型箱两端可拆卸地设置有封板;立柱,被配置为四根,均对称分布,且,所述立柱设置在Z方向上并固定在所述水平工作台的一端;能源桩模型箱,固定在四根所述立柱内侧,其中,能源桩设置所述能源桩模型箱中央部;升降送箱台,其具有可伸缩性,设置在所述Y方向上;弯管模型箱,滑动设置在所述升降送箱台上端面;以及土样更换辅助机构,设置在所述升降送箱台与所述能源桩模型箱间。

一种竖直地埋管内介质流动控制系统及控制方法

NºPublicación:  CN117870177A 12/04/2024
Solicitante: 
北京市科学技术研究院
CN_117870177_PA

Resumen de: CN117870177A

本发明公开了一种竖直地埋管内介质流动控制系统及控制方法,属于一般的控制系统领域,本发明系统包括U型管换热器、回水支管、进水支管、电源和信号采集器;还包括控制系统,该控制系统包括热感转接器、电动阀和三通转接;热感转接分别与U型管换热器的回水端和电动阀连接,三通转接分别与电动阀和回水支管连接,U型管换热器的进水端与进水支管连接。本发明适应于地埋管换热器管内介质流动的精细化控制,能够根据地埋管周围温度场分布变化,实现单根或多根地埋管换热器管内介质流动的随停和随启,解决了因地埋管换热器周边温度场分布不均造成的地源测整体换热效率低的难题,提高了系统能效比,降低了地源热泵系统运行经济成本。

中高温地热井同井开式灌采系统及方法

NºPublicación:  CN117870180A 12/04/2024
Solicitante: 
张国建
CN_117870180_PA

Resumen de: CN117870180A

一种中高温地热井同井开式灌采系统及方法,包括地热井体、压水管和抽采管,压水管的上端与水源连接,在压水管上安装有高压水泵,压水管的下端伸入到地热井体的某一深度,抽采管的下端伸入到地热井体的上部,在抽采管的下端安装有抽水泵,抽采管的下端位于水面下,抽采管的上端伸出地热井体与热水供应系统连接;本发明通过高压水泵将冷水压入到地热井体内部,冷水直接与井内的地热水混合交换热量形成温水,通过抽水泵同步将温水抽采出来进入到热力系统,这种同入同出直接混合的抽采方式换热效率高,热能利用更加充分,并且可使地热井体内水位基本恒定状态,有效避免出现地面沉降、塌陷现象,使温度与产量达到平衡,提高了地热资源的利用率。

一种用于余热跨季节储能供暖的地埋管系统

NºPublicación:  CN117870178A 12/04/2024
Solicitante: 
中冶武勘工程技术有限公司
CN_117870178_PA

Resumen de: CN117870178A

本发明涉及一种用于余热跨季节储能供暖的地埋管系统,其包括余热模块、蓄热模块和用热模块,蓄热模块包括地埋管和蓄热岩土体,地埋管内置于蓄热岩土体中,地埋管与余热模块连通,用以接收余热模块的热能,并将热能存储于蓄热岩土体中,用热模块与余热模块和/或地埋管连通;余热模块可收集全年断续分布的工业生产过程中产生的余热或太阳能光热,并通过介质在地埋管与余热模块之间的流动以及热交换,使上述热能存储于蓄热岩土体中,当有供热需求时,可通过介质在地埋管与用热模块之间的流动以及热交换,可取出并使用存储于蓄热岩土体中的热能,为建筑供热提供所需的热能,有效且充分利用工业生产产生的工业余热和太阳能光热。

一种带地下温度检测功能的地源热泵U型连接头及安装方法

NºPublicación:  CN117870176A 12/04/2024
Solicitante: 
中冶武勘工程技术有限公司
CN_117870176_PA

Resumen de: CN117870176A

本发明提供了一种带地下温度检测功能的地源热泵U型连接头及安装方法。所述U型连接头包括锥形中空底座和置于中空底座内的U型管接头和探针式温度传感器,在锥形中空底座的上端面设有控制线保护管接头,所述探针式温度传感器通过弹簧发射装置安装在对应控制线保护管接头的位置,且探针式温度传感器的探针端垂直朝下,并在温度传感器的探针端部设有硬质尖端;所述中空底座外壳体正对探针硬质尖端的部位设有受力保护盖,所述受力保护盖在外力作用下与中空底座外壳体分离。本发明在打井下管时将温度传感器与底座一起送入地下,并通过弹簧发射装置将温度传感器推入土中,从而实现对地下温度的准确测量,有利于长期有效地利用地下能源。

一种带导向管的中层同轴套管换热器

NºPublicación:  CN117870179A 12/04/2024
Solicitante: 
万江新能源股份有限公司
CN_117870179_PA

Resumen de: CN117870179A

本发明提出了一种带导向管的中层同轴套管换热器,以解决浅层及中深层地热井打井成本高,初投资大等问题;包括设置在土壤中竖直的外管,所述外管的内部同轴设置有竖直的导向管,所述外管的顶部一侧设置有进水管,所述导向管的顶部设置有贯穿外管的出水管,所述导向管靠近外管内壁底部的一端设置有锥形尖头,所述导向管靠近锥形尖头的一侧开设有多个引水孔,所述导向管的内部设置有传动组件,所述导向管的外壁上滑动连接有扰动组件;通过导向管、锥形尖头和引水孔等设置,当换热介质自进水管进入外管内部后,通过外部动力将换热介质由出水管抽出,当换热介质自引水孔进入导向管内部时,换热介质在外管内部产生扰动,在扰动过程中提高了换热效率。

一种浅层与中深层地源热泵供热系统及其控制方法

NºPublicación:  CN117870211A 12/04/2024
Solicitante: 
珠海格力电器股份有限公司
CN_117870211_PA

Resumen de: CN117870211A

本发明提供了一种浅层与中深层地源热泵供热系统及其控制方法,设置了第一地源热泵机组和第二地源热泵机组均和供热管路连接,其中第一地源热泵机组连接浅层地热源,第二地源热泵机组连接中深层地热源,因此,能够组合利用浅层地热源和中深层地热源提升供水温度,提升了系统供热能力的同时,还降低了成本;通过控制第一换热蝶阀组和第二换热蝶阀组,能够将第一地源热泵机组、第二地源热泵机组和供热管路串联,从而使供热管路中的水阶梯升温,提升了供回水温差,克服了单一热泵机组的供热能力限制,实现了大温差供热,提升了系统的供热效率。

一种应用于单井控制的异程式地埋管环路水力平衡结构及布置方法

NºPublicación:  CN117870175A 12/04/2024
Solicitante: 
中国煤炭地质总局水文地质局
CN_117870175_PA

Resumen de: CN117870175A

本发明公开了一种应用于单井控制的异程式地埋管环路水力平衡结构及布置方法,包括至少一个地埋管管群,地埋管管群包括一分水器、一集水器以及多根地埋管;每根地埋管对应埋设于一管井内,管井排列呈等腰直角三角形,分水器和集水器设于等腰直角三角形的斜边中点处,管井以等腰直角三角形的中垂线为界对称设置于等腰直角三角形内,且地埋管到分水器和集水器的距离越近,其埋地深度越深。本发明在保证地埋管数量不变的前提下,通过改变地埋管管群的划分方式,改变水平连接管的管路布置方式,调整竖直地埋管的埋地深度,使系统水力平衡满足要求,降低水泵能耗,减少系统运行费用;同时减少分集水器数量,降低初投资。

耦合地热能与压缩热泵的换热站分区供热系统

NºPublicación:  CN117869992A 12/04/2024
Solicitante: 
西安热工研究院有限公司西安西热节能技术有限公司
CN_117869992_PA

Resumen de: CN117869992A

本发明公开了一种耦合地热能与压缩热泵的换热站分区供热系统,包括一次网供回水循环单元、散热器供回水循环单元、一级压缩式热泵供热单元和地暖供回水循环单元,一次网供回水循环单元包括一次网回水管路和第一换热器,散热器供回水循环单元包括穿过第一换热器的散热器水循环管路,压缩式热泵供热单元包括第一热泵循环管路、第一压缩机、中间换热器及冷凝器,第一压缩机的进口管路连通中间换热器,出口管道连通冷凝器,一次网回水管路穿过中间换热器,地暖供回水循环单元包括穿过冷凝器的地暖水循环管路。本发明的耦合地热能与压缩热泵的换热站分区供热系统利用阶梯性供热,避免了地暖循环工质和散热器循环工质之间的温度差导致的热力失调问题。

一种采用扰流子强化换热的中深层换热系统

NºPublicación:  CN117870174A 12/04/2024
Solicitante: 
中冶沈勘工程技术有限公司
CN_117870174_PA

Resumen de: CN117870174A

本发明属于地热换热技术领域,特别提供了一种采用扰流子强化换热的中深层换热系统,包括外套管、内套管、测温光纤装配槽和扰流子组,内套管同轴设置于外套管内,内套管的外壁上轴向开设有测温光纤装配槽,多个扰流子组焊接于外套管的内壁上,且扰流子组与内套管的外壁间留有间隙;多个扰流子组呈螺旋阶梯式分布。本发明和目前采用的光管外套管换热装置相比,扰流子会降低换热器系统的热阻,增强了换热管内侧的换热系数,强化换热器的强化传热能力;同时,本方案采用球形链式扰流子,相较于传统金属翅片、螺旋状扰流子等形状的扰流子,提升的换热效率更多,扰流子的螺旋阶梯式布置方式能够进一步提高换热效率。

一种用于原油加热的地热能与太阳能耦合加热系统

NºPublicación:  CN117870169A 12/04/2024
Solicitante: 
北京石油化工学院
CN_117870169_PA

Resumen de: CN117870169A

本申请公开了一种用于原油加热的地热能与太阳能耦合加热系统,包括地热能加热模块和太阳能加热模块,地热能加热模块包括通过管道依次连接的输油管道缓冲器、油泵、输油管道油罐和分流阀,分流阀的下游连接有并联设置的第一分流管路和第二分流管路,第一分流管路的下游连接有集流阀,第二分流管路上依次安装有地热能油罐和电潜泵,第二分流管路的下游连接有同轴套管换热器,同轴套管换热器的下游通过管道连接到集流阀上,集流阀的下游管道上依次连接有油罐、温度仪和三通阀;太阳能加热模块包括冷凝器、相变蓄热器以及套管式换热器,相变蓄热器通过管道与冷凝器串联式连通并包裹在套管式换热器外表面。

SYSTEMS AND METHODS FOR TEMPERATURE CONTROL AND HEAT EXTRACTION FROM WASTE LANDFILLS

NºPublicación:  US2024118000A1 11/04/2024
Solicitante: 
YESILLER NAZLI [US]
HANSON JAMES L [US]
Yesiller Nazli,
Hanson James L
US_2022397309_PA

Resumen de: US2024118000A1

The field of the invention relates to systems and methods for exchanging heat from the degradation, decomposition, and chemical/biochemical transformation of municipal, industrial, and other types of waste. In one embodiment, a heat extraction system may include a closed-loop fluid circulation piping channeled throughout at least one heat extraction well oriented throughout a waste mass. The piping is fluidly coupled to a heat exchanger. A first circulation fluid is circulated through the closed-loop circulation piping into various depths of the waste mass to transfer thermal energy between said mass and said heat exchanger. In one embodiment, the transfer of thermal energy between the waste mass and the heat exchanger is used as alternative energy method and to control at least one of shear strength, compressibility, and hydraulic conductivity of the waste mass.

EXTRACTING GEOTHERMAL ENERGY FROM THIN SEDIMENTARY AQUIFERS

NºPublicación:  AU2022334476A1 11/04/2024
Solicitante: 
GEOTHERMAL TECHNOLOGIES INC
GEOTHERMAL TECHNOLOGIES, INC
AU_2022334476_PA

Resumen de: AU2022334476A1

Disclosed herein are system, apparatus, article of manufacture, method and/or computer program product embodiments, and/or combinations and sub-combinations thereof, for using a thin-bed hot sedimentary aquifer (HSA) in geothermal energy generation applications. An example embodiment operates by pumping, via an extraction well, heated water from an extraction depth of an HSA. The HSA is identified based on a permeability satisfying a threshold permeability range and could even have a thickness equal to or less than about 100 meters. The example embodiment further operates by extracting, via a power generation unit, heat from the heated water to generate power and transform the heated water into cooled water. Subsequently, the example embodiment operates by injecting, via an injection well, the cooled water at an injection depth of the HSA. A first portion of the extraction well and a second portion of the injection well are disposed within the HSA.

GEOTHERMAL WELL DIVERSION

NºPublicación:  WO2024076730A1 11/04/2024
Solicitante: 
SCHLUMBERGER TECH CORPORATION [US]
SCHLUMBERGER CANADA LTD [CA]
SERVICES PETROLIERS SCHLUMBERGER [FR]
SCHLUMBERGER TECH B V [NL]
SCHLUMBERGER TECHNOLOGY CORPORATION,
SCHLUMBERGER CANADA LIMITED,
SERVICES PETROLIERS SCHLUMBERGER,
SCHLUMBERGER TECHNOLOGY B.V

Resumen de: WO2024076730A1

Techniques for controlling tortuosity of fluid flow through a subterranean formation include introducing a diversion fluid into a wellbore, introducing a first fluid into the wellbore, collecting a second fluid from the wellbore or a second wellbore, and recovering heat from the second fluid. Techniques for increasing the likelihood that a fluid will absorb heat as it flows through rock fractures include introducing a first fluid into a first wellbore, introducing a particulate fluid into the first wellbore, collecting a second fluid from a second wellbore, and recovering heat from the second fluid. Techniques for recovering heat from a subterranean formation include observing a first parameter of a first fluid introduced into a first wellbore, observing a second parameter of a second fluid collected from a second wellbore, recovering heat from the second fluid, and introducing a diversion fluid into the first wellbore.

SYSTEM AND METHOD FOR HARVESTING GEOTHERMAL ENERGY FROM A SUBTERRANEAN FORMATION

NºPublicación:  AU2022333051A1 11/04/2024
Solicitante: 
COLORADO SCHOOL OF MINES
COLORADO SCHOOL OF MINES
AU_2022333051_PA

Resumen de: AU2022333051A1

A system and method of harvesting geothermal energy in a subterranean formation includes drilling an injection wellbore that extends into the subterranean formation, positioning a plurality of selectively opening sleeves in the injection wellbore spaced apart the subterranean formation, drilling at least one producing wellbore that extends into the subterranean formation in a predetermined location proximate to the injection wellbore, and fracturing or stimulating the subterranean formation in a plurality of locations proximate to the plurality of selectively opening sleeves to enhance a fluid pathway between the injection wellbore and the at least one producing wellbore. Fluid is injected down the injection wellbore at a first temperature, and the fluid is produced from the at least one producing wellbore at a second temperature higher than said first temperature.

Isolation devices and flow control device to control fluid flow in wellbore for geothermal energy transfer

NºPublicación:  GB2623269A 10/04/2024
Solicitante: 
HALLIBURTON ENERGY SERVICES INC [US]
Halliburton Energy Services, Inc
GB_2623269_PA

Resumen de: GB2623269A

A system can include isolation devices, a flow control device, and an energy transfer device. The isolation devices can be positioned between a wall of a wellbore and a tubular positioned in the wellbore for carrying fluid for geothermal energy transfer. The flow control device can be positioned in the wellbore and between the isolation devices for controlling flow of the fluid between zones of the wellbore for transferring geothermal energy to a surface of the wellbore. The energy transfer device can be positioned at the surface of the wellbore for transferring the geothermal energy from the fluid into usable energy.

PISTON AND CYLINDER ASSEMBLY OF A DOWNHOLE TOOL, DOWNHOLE TOOL WITH A PISTON AND CYLINDER ASSEMBLY, AND METHOD OF ASSEMBLING THE PISTON AND CYLINDER

Nº publicación: EP4347988A1 10/04/2024

Solicitante:

ROCKATEK LTD [GB]
ROCKATEK LIMITED

GB_2622159_PA

Resumen de: GB2622159A

The invention relates to a piston and cylinder assembly (12) of a downhole tool (10), and in particular to a piston and cylinder assembly of a rotary steerable tool. The piston (20) has an outer wall (80) which is in direct sliding contact with a wall of the cylinder (12) whereby to provide a solid sealing interface without elastomer seals. The cylinder has a retainer (22) for the piston, the retainer having at least one retaining part, the piston having at least one retained part (74), the retaining part and the retained part cooperating to retain the piston in the cylinder. The retained part is separate from the outer wall. The invention avoids the requirement for cross pins or the like to retain the piston in the cylinder and thereby avoids any holes or other discontinuities in the sealing surfaces. The invention thereby separates the function of retaining the piston from sealing the piston to cylinder interface. The invention also relates to a downhole tool with a piston and cylinder assembly, and a method of assembling the piston and cylinder including the steps of: inserting the piston into the cylinder so that the retained part passes the retaining part, rotating the piston relative to the cylinder so that at least a portion of the retained part becomes aligned with at least a portion of the retaining part, and locking the piston against rotation relative to the cylinder.

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