CN114673479B - Based on heterogeneous state CO 2 Horizon type geothermal strengthening mining method - Google Patents

Based on heterogeneous state CO 2 Horizon type geothermal strengthening mining method Download PDF

Info

Publication number
CN114673479B
CN114673479B CN202210491063.6A CN202210491063A CN114673479B CN 114673479 B CN114673479 B CN 114673479B CN 202210491063 A CN202210491063 A CN 202210491063A CN 114673479 B CN114673479 B CN 114673479B
Authority
CN
China
Prior art keywords
well
heat
horizontal
geothermal
drilling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210491063.6A
Other languages
Chinese (zh)
Other versions
CN114673479A (en
Inventor
徐吉钊
翟成
余旭
孙勇
陈爱坤
石克龙
丁熊
吴西卓
蔡渝梁
王帅
徐鹤翔
王宇
黄婷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Mining and Technology CUMT
Original Assignee
China University of Mining and Technology CUMT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Mining and Technology CUMT filed Critical China University of Mining and Technology CUMT
Priority to CN202210491063.6A priority Critical patent/CN114673479B/en
Publication of CN114673479A publication Critical patent/CN114673479A/en
Application granted granted Critical
Publication of CN114673479B publication Critical patent/CN114673479B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24TGEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00Geothermal collectors
    • F24T10/20Geothermal collectors using underground water as working fluid; using working fluid injected directly into the ground, e.g. using injection wells and recovery wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • E21B43/2605Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30Specific pattern of wells, e.g. optimising the spacing of wells
    • E21B43/305Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24TGEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00Geothermal collectors
    • F24T10/10Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/10Geothermal energy

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Sustainable Energy (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Development (AREA)
  • Geophysics (AREA)
  • Hydrology & Water Resources (AREA)
  • Earth Drilling (AREA)

Abstract

本发明公开了一种基于多相态CO2的层位式地热强化开采方法,采用“单主井改造提热—副井监测”的开采模式,大大减小了钻井成本,提高了单一钻井的利用效率;利用液态CO2注入地热层时受热后相变膨胀致裂原理增加体积改造范围,并且在相变致裂的同时,随着内部压力及温度的持续增加,使CO2气体变成处于超临界状态的CO2流体,在致裂完成后,此时使超临界状态的CO2流体与地热层换热后携带大量的地热能,最后高温超临界状态的CO2流体进入换热器内进行换热降温,使其提取的热量用于发电装置进行发电,换热完成后降温的CO2气体通过低温冷凝管降温重新液化成液态CO2,从而实现了CO2工质的闭环利用;最终提高了地热资源的整体开采效率。

Figure 202210491063

The invention discloses a multi-phase CO2 -based layered geothermal intensified mining method, which adopts the mining mode of "single main well reformation and heat improvement-auxiliary well monitoring", which greatly reduces the drilling cost and improves the single drilling cost. Utilization efficiency: using the principle of phase change expansion and cracking after heating when liquid CO 2 is injected into the geothermal layer to increase the volume reformation range, and at the same time as the phase change and cracking, with the continuous increase of internal pressure and temperature, the CO 2 gas becomes The CO2 fluid in the supercritical state, after the cracking is completed, the CO2 fluid in the supercritical state will carry a large amount of geothermal energy after heat exchange with the geothermal layer, and finally the CO2 fluid in the high temperature supercritical state enters the heat exchanger. The heat exchange is carried out to cool down, so that the extracted heat is used for the power generation device to generate electricity. After the heat exchange is completed, the cooled CO 2 gas is cooled down and re-liquefied into liquid CO 2 through the low temperature condenser, thus realizing the closed-loop utilization of CO 2 working fluid; finally Improve the overall mining efficiency of geothermal resources.

Figure 202210491063

Description

一种基于多相态CO2的层位式地热强化开采方法A Horizontal Geothermal Enhanced Mining Method Based on Multiphase CO2

技术领域technical field

本发明涉及一种基于多相态CO2的层位式地热强化开采方法,主要适用于低渗透性、岩层致密的深部干热岩储层的地热高效开采。The invention relates to a multiphase CO2 -based stratum-type geothermal intensified mining method, which is mainly suitable for high-efficiency geothermal mining of deep hot dry rock reservoirs with low permeability and dense rock formations.

背景技术Background technique

受日益匮乏的资源量和环境污染的影响,传统的能源结构正面临着不可忽视的应用威胁,而频发的环境问题也给传统能源消费带来了质疑。我国地热资源十分丰富,应用潜力巨大。据统计,我国深层地热资源基数为2.09×107EJ,相当于856万亿吨标准煤。按照干热岩地热资源开采率的2%下限进行计算,深层地热能源可开采量约为17万亿吨标准煤。因此,深部地热资源开发也越来越得到世界各国及研究学者的青睐。Affected by increasingly scarce resources and environmental pollution, the traditional energy structure is facing application threats that cannot be ignored, and frequent environmental problems have also brought doubts to traditional energy consumption. my country's geothermal resources are very rich and have great application potential. According to statistics, the base of China's deep geothermal resources is 2.09×10 7 EJ, equivalent to 856 trillion tons of standard coal. Calculated according to the 2% lower limit of the exploitation rate of hot dry rock geothermal resources, the exploitable amount of deep geothermal energy is about 17 trillion tons of standard coal. Therefore, the development of deep geothermal resources is increasingly favored by countries and researchers all over the world.

根据现有地热能分布特征,一般可分为浅层地热能(地表至地下200m)、水热型地热能(地下200m-3000m)和干热岩地热能(地下3000m以深)。现有学者多提出利用双井增强型地热开采模式,通过设置至少一个注入井注入高压水对干热岩储层进行改造,增强其渗透性和流体流量,然后驱动低温工质流经改造后的储层裂隙网络进行热能的提取,并将携带热量的工质流通过设置的生产井进行提取利用。该方法在世界范围内已得到广泛应用,也取得了比较好的技术突破,但同时也存在着一些应用局限性,比如,利用高压水对干热岩储层进行改造,这一过程会消耗大量的水资源,对于一些水资源匮乏地区的干热岩储层改造具有很大的应用限制;高压水改造储层过程多受地应力影响,产生的卸压范围呈多向性,难以做到储层致裂的有效控制;常规储层改造方式的改造范围较窄,后期的工质流所流经的区间有限,很难获取得到充足的热量;并且现有采用的双井开采模式常受限于注入井的改造能力,容易出现生产接续问题。另外公开号为:CN114033346A,名称为“一种基于二氧化碳介质的深层地热开采方法”的发明专利公开了采用二氧化碳作为传热介质进行地热开采的方法,其虽然无需高压水注入,但是由于其仍然需要设置双井模式,并且还要向井内设置CO2相变致裂器进行致裂,而CO2相变致裂器安装相对较为困难,且致裂范围有限,并且其注入井内的换热介质为超临界CO2,这样不仅需要大型加热设备和加压设备,而且需要消耗大量能量,因此,这种方式也会导致地热资源的开采成本较高及换热效率较低;因此如何提供一种方法,能有效降低钻井施工复杂度及施工成本的情况下,还能有效保证地热资源开采后的换热效率,最终提高地热资源的整体开采效率,是本行业的研究方向之一。According to the distribution characteristics of existing geothermal energy, it can generally be divided into shallow geothermal energy (surface to 200m underground), hydrothermal geothermal energy (200m-3000m underground), and dry hot rock geothermal energy (under 3000m underground). Existing scholars often propose to use the double-well enhanced geothermal recovery mode to modify the hot dry rock reservoir by setting at least one injection well to inject high-pressure water to enhance its permeability and fluid flow, and then drive the low-temperature working fluid to flow through the modified geothermal reservoir. The reservoir fracture network extracts heat energy, and the working medium flow carrying heat is extracted and utilized through the set production wells. This method has been widely used all over the world and has achieved relatively good technological breakthroughs, but there are also some application limitations. For example, using high-pressure water to stimulate dry hot rock reservoirs will consume a lot of water resources, there are great limitations in the application of hot dry rock reservoir stimulation in some water-scarce areas; the process of high-pressure water stimulation reservoirs is mostly affected by in-situ stress, and the range of pressure relief produced is multi-directional, making it difficult to achieve Effective control of layer fracturing; conventional reservoir stimulation methods have a narrow stimulation range, and the later period of working fluid flow is limited, so it is difficult to obtain sufficient heat; and the existing dual-well production mode is often limited Due to the stimulation ability of injection wells, production continuity problems are prone to occur. In addition, the publication number is: CN114033346A, and the invention patent titled "a deep geothermal mining method based on carbon dioxide medium" discloses a method for geothermal mining using carbon dioxide as a heat transfer medium. Although it does not require high-pressure water injection, it still requires The double well mode is set up, and a CO 2 phase-change cracker is also installed in the well for fracturing, but the installation of the CO 2 phase-change cracker is relatively difficult, and the cracking range is limited, and the heat exchange medium injected into the well is Supercritical CO 2 , which not only requires large-scale heating equipment and pressurization equipment, but also consumes a lot of energy. Therefore, this method will also lead to high mining costs of geothermal resources and low heat exchange efficiency; therefore, how to provide a method , can effectively reduce the complexity and cost of drilling construction, and can effectively ensure the heat transfer efficiency after geothermal resources are exploited, and ultimately improve the overall exploitation efficiency of geothermal resources, which is one of the research directions of this industry.

发明内容Contents of the invention

针对上述现有技术存在的问题,本发明提供一种基于多相态CO2的层位式地热强化开采方法,能有效降低钻井施工复杂度及施工成本的情况下,还能有效保证地热资源开采后的换热效率,最终提高地热资源的整体开采效率。Aiming at the problems existing in the above-mentioned prior art, the present invention provides a multi-phase CO2 -based layer-type geothermal enhanced mining method, which can effectively reduce the complexity and construction cost of drilling construction, and can effectively ensure the exploitation of geothermal resources The final heat exchange efficiency will ultimately improve the overall exploitation efficiency of geothermal resources.

为了实现上述目的,本发明采用的技术方案是:一种基于多相态CO2的层位式地热强化开采方法,具体步骤为:In order to achieve the above object, the technical solution adopted in the present invention is: a layer-type geothermal enhanced mining method based on multiphase CO 2 , the specific steps are:

A、首先利用钻机在地面向下进行钻设,使钻孔穿过上覆地层到达干热岩储层中形成竖井,竖井分成上覆地层段和干热岩储层段,竖井直径为300-400mm,竖井井底进入干热岩储层内150-200m范围内;A. First, use a drilling rig to drill downward on the ground, so that the borehole passes through the overlying strata to reach the hot dry rock reservoir to form a shaft. The shaft is divided into the overlying stratum section and the hot dry rock reservoir section. The diameter of the shaft is 300- 400mm, the bottom of the shaft enters within 150-200m of the hot dry rock reservoir;

B、在钻机上安装定向钻头,并将定向钻头伸入至干热岩储层,使定向钻头从竖井沿同一水平方向在干热岩储层不同深度依次钻进形成三个水平钻井,且从上至下分别设定为第一水平钻井、第二水平钻井和第三水平钻井,并在退钻时排渣排浆;接着利用钻机从地面钻设监测井,使监测井的终孔位置处于第一水平钻井正上方的上覆地层内;B. Install the directional drill bit on the drilling rig, and extend the directional drill bit into the hot dry rock reservoir, so that the directional drill bit drills in sequence from the shaft along the same horizontal direction at different depths in the hot dry rock reservoir to form three horizontal drilling wells, and from From top to bottom, the first horizontal drilling, the second horizontal drilling and the third horizontal drilling are respectively set, and the slag and slurry are discharged when the drilling is withdrawn; In the overburden directly above the first horizontal well;

C、在竖井的上覆地层段和干热岩储层段交界处安装高压密封器,对竖井的干热岩储层段进行封堵;然后将绝热注液管一端和绝热抽采管一端均伸入竖井内、并穿过高压密封器,其中绝热注液管一端伸入第二水平钻井中,并在绝热注液管一端安装耐温压封隔器对第二水平钻井进行封堵;绝热抽采管一端处于竖井的干热岩储层段;C. Install a high-pressure sealer at the junction of the overlying formation section and the hot dry rock reservoir section of the shaft to seal off the hot dry rock reservoir section of the shaft; Extend into the shaft and pass through the high-pressure sealer, where one end of the heat-insulating liquid injection pipe extends into the second horizontal drilling, and a heat-resistant and pressure-resistant packer is installed at one end of the heat-insulating liquid injection pipe to seal the second horizontal drilling; heat insulation One end of the extraction pipe is located in the hot dry rock reservoir section of the shaft;

D、绝热注液管另一端与CO2泵体的出口连接,绝热抽采管另一端与换热器的进口连接,换热器的热量排出口通过传热管路与发电装置连接,换热器的流体排出口与低温冷凝管一端连接,低温冷凝管另一端与CO2泵体的进口连接,接着将监测装置送入监测井的终孔位置,监测装置通过光纤数据传输线与地面上的多源数据反演系统连接,完成多相态CO2地热开采系统的布设工作;D. The other end of the insulated liquid injection pipe is connected to the outlet of the CO2 pump body, the other end of the adiabatic extraction pipe is connected to the inlet of the heat exchanger, and the heat outlet of the heat exchanger is connected to the power generation device through the heat transfer pipeline for heat exchange The fluid discharge outlet of the device is connected to one end of the cryogenic condenser tube, and the other end of the cryogenic condenser tube is connected to the inlet of the CO2 pump body, and then the monitoring device is sent to the end hole of the monitoring well, and the monitoring device is connected to the multiple on the ground through the optical fiber data transmission line. The source data inversion system is connected, and the layout of the multiphase CO 2 geothermal recovery system is completed;

E、开始进行地热开采工作时,先启动CO2泵体一段时间,使其将低温冷凝管内的高压低温液态CO2流体经由绝热注液管注入第二水平钻井内,低温液态CO2流体在第二水平钻井内受到地热温度影响持续升温,此时液态CO2流体吸热过程中发生瞬态相变形成CO2气体,由于第二水平钻井被封堵,其产生的高压膨胀作用对第二水平钻井周围干热岩进行冲击致裂,完成一次冲击致裂过程,然后重复上述过程再启动CO2泵体一段时间,如此经过多次循环致裂过程后,使第二水平钻井周围的干热岩形成复杂的裂隙网络,同时监测装置实时对下方的地质情况进行监测,并将监测数据反馈给多源数据反演系统,多源数据反演系统根据监测数据对地热层的致裂情况进行确定,并根据致裂情况调整CO2泵体的注入压力和注入流量,直至监测到第二水平钻井通过裂隙网络分别与第一水平钻井和第三水平钻井发生贯通时,停止CO2泵体工作完成致裂过程;E. When starting geothermal exploitation, first start the CO2 pump body for a period of time, so that it can inject the high-pressure and low-temperature liquid CO2 fluid in the low-temperature condensation pipe into the second horizontal drilling through the heat-insulating liquid injection pipe, and the low-temperature liquid CO2 fluid at the first The temperature in the second horizontal drilling continues to rise due to the influence of geothermal temperature. At this time, the liquid CO 2 fluid undergoes a transient phase transition during the heat absorption process to form CO 2 gas. Since the second horizontal drilling is blocked, the high-pressure expansion generated by it has a negative effect on the second horizontal drilling. The hot dry rock around the drilling well is subjected to impact fracturing, and the impact fracturing process is completed once, and then the above process is repeated and the CO 2 pump body is started for a period of time. After several cycles of fracturing, the hot dry rock around the second horizontal drilling A complex fracture network is formed. At the same time, the monitoring device monitors the geological conditions below in real time, and feeds the monitoring data back to the multi-source data inversion system. The multi-source data inversion system determines the fracturing of the geothermal layer based on the monitoring data. And adjust the injection pressure and injection flow rate of the CO 2 pump body according to the fracturing situation until the second horizontal drilling well is monitored to pass through the fracture network to the first horizontal drilling well and the third horizontal drilling well respectively, and the CO 2 pump body is stopped to complete the work. cracking process;

F、当裂隙网络(13)将第一水平钻井、第二水平钻井和第三水平钻井相互贯通时,由于持续多次循环注入的液态CO2流体在地热温度及气化产生的压力共同作用下,液态CO2流体相变形成CO2气体会变成处于超临界状态的CO2流体,接着由于第一水平钻井和第三水平钻井内的气压较低,此时处于超临界状态的CO2流体沿着裂隙网络进入第一水平钻井和第三水平钻井内,并持续进行吸热,最终经由竖井进入绝热抽采管内;F. When the fracture network (13) connects the first horizontal well, the second horizontal well and the third horizontal well, the liquid CO2 fluid injected continuously for multiple cycles is under the joint action of the geothermal temperature and the pressure generated by gasification , the liquid CO 2 fluid phase changes to form CO 2 gas will become CO 2 fluid in supercritical state, and then due to the lower gas pressure in the first horizontal drilling and the third horizontal drilling, the CO 2 fluid in supercritical state at this time Enter the first horizontal drilling well and the third horizontal drilling well along the fracture network, and continue to absorb heat, and finally enter the adiabatic extraction pipe through the shaft;

G、高温CO2流体经过绝热抽采管进入换热器,在换热器内经过辐射换热过程将分离出来的热量通过传热管路进入发电装置进行发电,换热完成后降温的CO2气体进入低温冷凝管,通过低温冷凝管降温作用使CO2气体重新液化成液态CO2进行储藏;G. The high-temperature CO 2 fluid enters the heat exchanger through the adiabatic extraction pipe. In the heat exchanger, through the radiation heat exchange process, the separated heat enters the power generation device through the heat transfer pipeline for power generation. After the heat exchange is completed, the cooled CO 2 The gas enters the cryogenic condenser, and the CO 2 gas is re-liquefied into liquid CO 2 for storage through the cooling effect of the cryogenic condenser;

H、待换热器分离出来的热量值低于设定值时,重复步骤E至G,从而提高换热器分离出来的热量值,如此循环,最终实现对干热岩的地热开采。H. When the heat value separated by the heat exchanger is lower than the set value, repeat steps E to G, so as to increase the heat value separated by the heat exchanger, and so on, and finally realize the geothermal exploitation of hot dry rock.

进一步,所述监测装置包括微震监测探头、超声波探头和气体监测探头,且各个探头均采用热绝缘包裹方式用于隔离高温。采用这种结构能通过多种不同探头对地热层的致裂情况进行数据采集,便于后续数据处理的准确性。Further, the monitoring device includes microseismic monitoring probes, ultrasonic probes and gas monitoring probes, and each probe is wrapped in thermal insulation to isolate high temperature. With this structure, data can be collected on the fracturing of the geothermal layer through a variety of different probes, which facilitates the accuracy of subsequent data processing.

进一步,所述第一水平钻井、第二水平钻井和第三水平钻井的钻井直径均为150-180mm,钻井长度均处在200-300m范围。Further, the drilling diameters of the first horizontal drilling, the second horizontal drilling and the third horizontal drilling are all 150-180mm, and the drilling lengths are all in the range of 200-300m.

进一步,所述第一水平钻井、第二水平钻井和第三水平钻井在空间层位上的方位角误差小于5°,第三水平钻井布置在竖井井底位置,第二水平钻井和第一水平钻井分别布置在第三水平钻井上方60m、120m位置。采用这个布设,不仅便于对地热层致裂,而且能更好的实现对地热层的换热开采。Further, the azimuth error of the first horizontal drilling, the second horizontal drilling and the third horizontal drilling on the spatial horizon is less than 5°, the third horizontal drilling is arranged at the bottom of the shaft, the second horizontal drilling and the first horizontal drilling Drilling wells are respectively arranged at positions 60m and 120m above the third horizontal drilling well. Adopting this arrangement not only facilitates fracturing of the geothermal layer, but also better realizes heat exchange exploitation of the geothermal layer.

进一步,所述高压密封器最大耐受压力为150MPa,最大耐受温度为500℃。这样能保证其密封效果。Further, the maximum withstand pressure of the high pressure sealer is 150MPa, and the maximum withstand temperature is 500°C. This can ensure its sealing effect.

进一步,所述耐温压封隔器能够承受的最大温度为600℃,最大压力为200Mpa。这样能保证其密封效果。Furthermore, the maximum temperature and pressure that the temperature and pressure resistant packer can withstand is 600°C and 200Mpa. This can ensure its sealing effect.

进一步,所述绝热注液管和绝热抽采管均采用柔性材料,且能够承受的最大温度为 500℃;绝热注液管管径为80mm,绝热抽采管管径为150mm。这样设置保证通过绝热注液管注入地热层内的CO2介质处于液态,便于后续工作的开展。Further, both the heat-insulated liquid injection pipe and the heat-insulated extraction pipe are made of flexible materials, and the maximum temperature they can withstand is 500°C; the diameter of the heat-insulated liquid injection pipe is 80 mm, and the diameter of the heat-insulated extraction pipe is 150 mm. This setting ensures that the CO2 medium injected into the geothermal layer through the adiabatic liquid injection pipe is in a liquid state, which facilitates the development of follow-up work.

进一步,所述CO2泵体的注入压力可调控范围为10-70MPa,注入流量范围为5-10L/min。这种参数范围能满足致裂时对CO2泵体的调控需要,保证致裂的顺利进行。Further, the injection pressure of the CO 2 pump body can be adjusted in the range of 10-70MPa, and the injection flow range is in the range of 5-10L/min. This parameter range can meet the control requirements of the CO 2 pump during fracturing and ensure the smooth progress of fracturing.

与现有技术相比,本发明将注入井和抽采井合二为一,并且与多种相态的CO2相结合的方式,通过定向卸压技术和不同相态CO2相变时产生的能量扩大地热储层改造区域面积,联合多种监测传感器实现原位监测,保证致裂的顺利进行,提出了“单主井改造提热—副井监测”的开采模式,即只有一个井伸入地热层,无需额外再增设,监测井仅仅是处于上覆底层内,这样的方式一方面形成了能够集合储层改造、工质驱动取热和工质提热等工序为一体的单井开采方式,大大减小了钻井成本,提高了单一钻井的利用效率;另一方面利用液态CO2注入地热层时受热后相变膨胀致裂原理增加体积改造范围,并且在相变致裂的同时,随着内部压力及温度的持续增加,使CO2气体变成处于超临界状态的CO2流体,在致裂完成后(即裂隙网络连通各个钻井时),此时利用其超临界状态的强流动性、低摩阻性等优势进入裂隙网络的多尺度孔裂隙结构中使超临界状态的CO2流体与地热层换热后,携带大量的地热能,最后高温超临界状态的CO2流体通过绝热抽采管进入换热器内进行换热降温,使其提取的热量用于发电装置进行发电,换热完成后降温的CO2气体进入低温冷凝管,通过低温冷凝管降温作用使CO2气体重新液化成液态CO2进行储藏,作为后续注入的工质源,从而实现了CO2工质的闭环利用;另外通过监测井的设置,利用微震技术、声波技术和气体监测技术分别监测储层致裂改造过程和气体运移规律,借助现有的深度学习算法对海量数据进行训练预测,可为调节CO2工质不同阶段的注入参数进行有效调节,最终保证致裂的顺利进行,有效保证了地热资源开采后的换热效率,提高了地热资源的整体开采效率。Compared with the prior art, the present invention combines the injection well and the extraction well into one, and combines it with various phases of CO 2 , through directional pressure relief technology and different phases of CO 2 phase transitions to generate The energy of the geothermal reservoir can be expanded to expand the area of geothermal reservoir stimulation, and multiple monitoring sensors can be combined to realize in-situ monitoring to ensure the smooth progress of fracturing. Into the geothermal layer, there is no need for additional installations, and the monitoring well is only located in the overlying bottom layer. On the one hand, this method forms a single-well production that can integrate reservoir transformation, working fluid-driven heat extraction, and working fluid heating. method, which greatly reduces the drilling cost and improves the utilization efficiency of a single well; on the other hand, when liquid CO 2 is injected into the geothermal layer, the principle of phase change expansion fracturing after heating is used to increase the volume reconstruction range, and at the same time of phase change fracturing, As the internal pressure and temperature continue to increase, the CO 2 gas becomes a CO 2 fluid in a supercritical state. After the fracturing is completed (that is, when the fracture network connects each drilling well), at this time, the strong flow of the supercritical state is used Advantages such as high resistance and low friction enter into the multi-scale pore-fracture structure of the fracture network so that the CO 2 fluid in the supercritical state exchanges heat with the geothermal layer, and carries a large amount of geothermal energy. Finally, the CO 2 fluid in the high-temperature supercritical state passes through the adiabatic The extraction pipe enters the heat exchanger for heat exchange and cooling, so that the extracted heat is used in the power generation device to generate electricity. After the heat exchange is completed, the cooled CO 2 gas enters the low-temperature condenser tube, and the CO 2 gas is regenerated through the cooling effect of the low-temperature condenser tube. Liquefied into liquid CO2 for storage, as a source of working fluid for subsequent injection, thus realizing the closed-loop utilization of CO2 working fluid; in addition, through the setting of monitoring wells, microseismic technology, acoustic wave technology and gas monitoring technology are used to monitor reservoir fracturing In the transformation process and gas migration law, with the help of the existing deep learning algorithm to train and predict massive data, it can effectively adjust the injection parameters of different stages of CO 2 working fluid, and finally ensure the smooth progress of fracturing and effectively ensure the geothermal energy. The heat exchange efficiency after resource mining improves the overall mining efficiency of geothermal resources.

附图说明Description of drawings

图1是本发明的结构示意图。Fig. 1 is a structural schematic diagram of the present invention.

图中:1-上覆地层;2-干热岩储层;3-竖井;4-第一水平钻井;5-第二水平钻井;6-第三水平钻井;7-绝热注液管;8-高压密封器;9-耐温压封隔器;10-CO2泵体;11-绝热抽采管;12-换热器;13-传热管路;14-发电装置;15-低温冷凝管;16-裂隙网络;17-多源数据反演系统;18-光纤数据传输线;19-监测井;20-监测装置。In the figure: 1-overlying formation; 2-hot dry rock reservoir; 3-vertical well; 4-first horizontal drilling; 5-second horizontal drilling; 6-third horizontal drilling; 7-insulation liquid injection pipe; 8 -high pressure sealer; 9-temperature and pressure resistant packer; 10-CO 2 pump body; 11-insulated extraction pipe; 12-heat exchanger; 13-heat transfer pipeline; 14-power generation device; 15-low temperature condensation 16-fracture network; 17-multi-source data inversion system; 18-optical fiber data transmission line; 19-monitoring well; 20-monitoring device.

具体实施方式Detailed ways

下面将对本发明作进一步说明。The present invention will be further described below.

如图1所示,本发明的具体步骤为:As shown in Figure 1, the concrete steps of the present invention are:

A、首先利用钻机在地面向下进行钻设,使钻孔穿过上覆地层1到达干热岩储层1中形成竖井3,竖井3分成上覆地层段和干热岩储层段,竖井3的直径为300-400mm,竖井3 井底进入干热岩储层1内150-200m范围内;A. First, use a drilling rig to drill downwards on the ground, so that the borehole passes through the overlying stratum 1 to reach the hot dry rock reservoir 1 to form a shaft 3. The shaft 3 is divided into an overlying stratum section and a hot dry rock reservoir section. 3 has a diameter of 300-400mm, and the bottom of shaft 3 enters within 150-200m of hot dry rock reservoir 1;

B、在钻机上安装定向钻头,并将定向钻头伸入至干热岩储层2,使定向钻头从竖井3 沿同一水平方向在干热岩储层2不同深度依次钻进形成三个水平钻井,三个水平钻井的钻井直径均为150-180mm,钻井长度均处在200-300m范围,且从上至下分别设定为第一水平钻井4、第二水平钻井5和第三水平钻井6,第一水平钻井4、第二水平钻井5和第三水平钻井6在空间层位上的方位角误差小于5°,第三水平钻井6布置在竖井3井底位置,第二水平钻井4和第一水平钻井3分别布置在第三水平钻井5上方60m、120m位置;采用这个布设,不仅便于对地热层致裂,而且能更好的实现对地热层的换热开采;并在退钻时排渣排浆;接着利用钻机从地面钻设监测井19,使监测井19的终孔位置处于第一水平钻井4正上方的上覆地层1内;B. Install the directional drill bit on the drilling rig, and extend the directional drill bit into the hot dry rock reservoir 2, so that the directional drill bit drills sequentially from the shaft 3 along the same horizontal direction at different depths in the hot dry rock reservoir 2 to form three horizontal drilling wells , the drilling diameters of the three horizontal drilling wells are all 150-180mm, the drilling lengths are all in the range of 200-300m, and they are respectively set as the first horizontal drilling 4, the second horizontal drilling 5 and the third horizontal drilling 6 from top to bottom , the azimuth error of the first horizontal drilling 4, the second horizontal drilling 5 and the third horizontal drilling 6 on the spatial horizon is less than 5°, the third horizontal drilling 6 is arranged at the bottom of the shaft 3, the second horizontal drilling 4 and The first horizontal drilling well 3 is respectively arranged at positions 60m and 120m above the third horizontal drilling well 5; adopting this arrangement not only facilitates cracking of the geothermal layer, but also better realizes heat exchange and exploitation of the geothermal layer; Slag discharge and slurry discharge; then use a drilling rig to drill a monitoring well 19 from the ground, so that the final hole position of the monitoring well 19 is in the overlying formation 1 directly above the first horizontal drilling 4;

C、在竖井3的上覆地层段和干热岩储层段交界处安装高压密封器8,对竖井3的干热岩储层段进行封堵;高压密封器8最大耐受压力为150MPa,最大耐受温度为500℃,这样能保证其密封效果;然后将绝热注液管7一端和绝热抽采管11一端均伸入竖井3内、并穿过高压密封器8,其中绝热注液管7一端伸入第二水平钻井5中,并在绝热注液管7一端安装耐温压封隔器9对第二水平钻井进行封堵;耐温压封隔器9能够承受的最大温度为600℃,最大压力为200Mpa。这样能保证其密封效果;绝热抽采管11一端处于竖井3的干热岩储层段;C. Install a high-pressure sealer 8 at the junction of the overlying formation section of the vertical shaft 3 and the hot dry rock reservoir section to seal off the hot dry rock reservoir section of the vertical shaft 3; the maximum withstand pressure of the high pressure sealer 8 is 150MPa, The maximum withstand temperature is 500°C, which can ensure its sealing effect; then both the end of the heat-insulating liquid injection pipe 7 and the end of the heat-insulated extraction pipe 11 are extended into the shaft 3 and passed through the high-pressure sealer 8, wherein the heat-insulated liquid injection pipe One end of 7 extends into the second horizontal drilling 5, and a heat-resistant and pressure-resistant packer 9 is installed at one end of the adiabatic liquid injection pipe 7 to seal the second horizontal drilling; the maximum temperature that the temperature-resistant and pressure-resistant packer 9 can withstand is 600 ℃, the maximum pressure is 200Mpa. This can ensure its sealing effect; one end of the heat-insulating extraction pipe 11 is located in the hot dry rock reservoir section of the shaft 3;

D、绝热注液管7另一端与CO2泵体10的出口连接,绝热抽采管7另一端与换热器11的进口连接,换热器11的热量排出口通过传热管路13与发电装置14连接,换热器11的流体排出口与低温冷凝管15一端连接,低温冷凝管15另一端与CO2泵体10的进口连接,接着将监测装置20送入监测井19的终孔位置,监测装置20通过光纤数据传输线18与地面上的多源数据反演系统17连接,所述监测装置20包括微震监测探头、超声波探头和气体监测探头,且各个探头均采用热绝缘包裹方式用于隔离高温。采用这种结构能通过多种不同探头对地热层的致裂情况进行数据采集,便于后续数据处理的准确性,完成多相态CO2地热开采系统的布设工作;所述绝热注液管7和绝热抽采管11均采用柔性材料,且能够承受的最大温度为500℃;绝热注液管7管径为80mm,绝热抽采管11管径为150mm。这样设置保证通过绝热注液管7注入地热层内的CO2介质处于液态,便于后续工作的开展;D, the other end of the heat-insulating liquid injection pipe 7 is connected to the outlet of the CO2 pump body 10, the other end of the heat-insulated extraction pipe 7 is connected to the inlet of the heat exchanger 11, and the heat outlet of the heat exchanger 11 is connected to the heat transfer pipeline 13 The power generation device 14 is connected, the fluid outlet of the heat exchanger 11 is connected to one end of the low-temperature condensation pipe 15, and the other end of the low-temperature condensation pipe 15 is connected to the inlet of the CO2 pump body 10, and then the monitoring device 20 is sent into the end hole of the monitoring well 19 position, the monitoring device 20 is connected to the multi-source data inversion system 17 on the ground through the optical fiber data transmission line 18, and the monitoring device 20 includes microseismic monitoring probes, ultrasonic probes and gas monitoring probes, and each probe is used for thermal insulation wrapping. for high temperature isolation. Adopting this structure can carry out data acquisition to the fracturing situation of geothermal layer by a variety of different probes, facilitate the accuracy of follow-up data processing, and complete the layout work of the multiphase CO2 geothermal recovery system; the heat-insulating liquid injection pipe 7 and The adiabatic extraction pipe 11 is made of flexible materials, and the maximum temperature it can withstand is 500°C; the diameter of the adiabatic liquid injection pipe 7 is 80 mm, and the diameter of the adiabatic extraction pipe 11 is 150 mm. This arrangement ensures that the CO2 medium injected into the geothermal layer by the heat-insulating liquid injection pipe 7 is in a liquid state, which is convenient for the development of follow-up work;

E、开始进行地热开采工作时,先启动CO2泵体10一段时间,使其将低温冷凝管15内的高压低温液态CO2流体经由绝热注液管7注入第二水平钻井5内,低温液态CO2流体在第二水平钻井5内受到地热温度影响持续升温,此时液态CO2流体吸热过程中发生瞬态相变形成CO2气体,由于第二水平钻井5被封堵,其产生的高压膨胀作用对第二水平钻井5 周围干热岩进行冲击致裂,完成一次冲击致裂过程,然后重复上述过程再启动CO2泵体10 一段时间,如此经过多次循环致裂过程后,使第二水平钻井5周围的干热岩形成复杂的裂隙网络16,同时监测装置20实时对下方的地质情况进行监测,并将监测数据反馈给多源数据反演系统17,多源数据反演系统17根据监测数据对地热层的致裂情况进行确定,并根据致裂情况调整CO2泵体10的注入压力和注入流量,直至监测到第二水平钻井5通过裂隙网络16分别与第一水平钻井4和第三水平钻井6发生贯通时,停止CO2泵体10工作完成致裂过程;所述CO2泵体10的注入压力可调控范围为10-70MPa,注入流量范围为5-10L/min。这种参数范围能满足致裂时对CO2泵体10的调控需要,保证致裂的顺利进行;E. When starting geothermal exploitation work, start the CO2 pump body 10 for a period of time to make it inject the high-pressure and low-temperature liquid CO2 fluid in the low-temperature condensation pipe 15 into the second horizontal drilling 5 through the heat-insulating liquid injection pipe 7, and the low-temperature liquid The CO 2 fluid in the second horizontal drilling 5 is affected by the geothermal temperature and continues to heat up. At this time, the liquid CO 2 fluid undergoes a transient phase change during the heat absorption process to form CO 2 gas. Since the second horizontal drilling 5 is blocked, the produced The high-pressure expansion impacts the hot dry rock around the second horizontal drilling 5 to complete a shock fracturing process, and then repeats the above process and starts the CO 2 pump body 10 for a period of time. After multiple cyclic fracturing processes, the The hot dry rock around the second horizontal drilling 5 forms a complex fracture network 16, while the monitoring device 20 monitors the geological conditions below in real time, and feeds the monitoring data back to the multi-source data inversion system 17, the multi-source data inversion system 17 Determine the fracturing situation of the geothermal layer according to the monitoring data, and adjust the injection pressure and injection flow rate of the CO2 pump body 10 according to the fracturing situation until the second horizontal drilling 5 passes through the fracture network 16 and respectively connects with the first horizontal drilling well. 4 and the third horizontal drilling 6 break through, stop the CO 2 pump body 10 to complete the fracturing process; the injection pressure of the CO 2 pump body 10 can be adjusted in the range of 10-70MPa, and the injection flow range is 5-10L/min . This parameter range can meet the control requirements of the CO2 pump body 10 during fracturing, and ensure the smooth progress of fracturing;

F、当裂隙网络16将第一水平钻井4、第二水平钻井5和第三水平钻井6相互贯通时,由于持续多次循环注入的液态CO2流体在地热温度及气化产生的压力共同作用下,液态CO2流体相变形成CO2气体会变成处于超临界状态的CO2流体,接着由于第一水平钻井4和第三水平钻井6内的气压较低,此时处于超临界状态的CO2流体沿着裂隙网络16进入第一水平钻井4和第三水平钻井6内,并持续进行吸热,最终经由竖井3进入绝热抽采管11内;F. When the fracture network 16 connects the first horizontal well 4, the second horizontal well 5 and the third horizontal well 6, the liquid CO2 fluid injected continuously for multiple cycles acts together at the geothermal temperature and the pressure generated by gasification Next, liquid CO 2 fluid phase transition forms CO 2 gas will become CO in supercritical state Fluid, then because the air pressure in the first horizontal drilling 4 and the third horizontal drilling 6 is low, now the gas in supercritical state The CO 2 fluid enters the first horizontal well 4 and the third horizontal well 6 along the fracture network 16, continues to absorb heat, and finally enters the heat-insulated extraction pipe 11 through the shaft 3;

G、高温CO2流体经过绝热抽采管11进入换热器12,在换热器12内经过辐射换热过程将分离出来的热量通过传热管路13进入发电装置14进行发电,换热完成后降温的CO2气体进入低温冷凝管15,通过低温冷凝管15降温作用使CO2气体重新液化成液态CO2进行储藏;G. The high-temperature CO2 fluid enters the heat exchanger 12 through the adiabatic extraction pipe 11, and the separated heat enters the power generation device 14 through the heat transfer pipeline 13 through the radiation heat exchange process in the heat exchanger 12 to generate electricity, and the heat exchange is completed Afterwards, the cooled CO2 gas enters the low-temperature condensation pipe 15, and the CO2 gas is re-liquefied into liquid CO2 by the cooling effect of the low-temperature condensation pipe 15 for storage;

H、待换热器12分离出来的热量值低于设定值时,重复步骤E至G,从而提高换热器12分离出来的热量值,如此循环,最终实现对干热岩的地热开采。H. When the heat value separated by the heat exchanger 12 is lower than the set value, repeat steps E to G, thereby increasing the heat value separated by the heat exchanger 12, and so on, and finally realize the geothermal exploitation of the hot dry rock.

上述高压密封器8、耐温压封隔器9、CO2泵体10、换热器12、发电装置14、低温冷凝管15、多源数据反演系统17和监测装置20均为现有设备或器件,能通过市场购买获得;其中多源数据反演系统17在接收到监测装置20反馈的监测数据后采用已知的深度学习算法和滤波降噪技术对监测数据进行分析处理,从而实现致裂过程的可视化。便于后续根据致裂情况及时调整CO2泵体的压力及流量。低温冷凝管15能将流入的CO2气体通过持续降温,使其相变成液态CO2流体。The above-mentioned high-pressure sealer 8, temperature-resistant and pressure-resistant packer 9, CO2 pump body 10, heat exchanger 12, power generation device 14, cryogenic condenser tube 15, multi-source data inversion system 17 and monitoring device 20 are all existing equipment or devices, which can be obtained through market purchase; where the multi-source data inversion system 17 uses known deep learning algorithms and filtering and noise reduction techniques to analyze and process the monitoring data after receiving the monitoring data fed back by the monitoring device 20, so as to achieve Visualization of cracking process. It is convenient to adjust the pressure and flow rate of the CO2 pump body in time according to the fracturing situation. The low-temperature condensation pipe 15 can continuously lower the temperature of the inflowing CO 2 gas, so that its phase changes into a liquid CO 2 fluid.

以上所述仅是本发明的优选实施方式,应当指出:对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (8)

1. Based on heterogeneous state CO 2 The horizon type geothermal reinforced mining method is characterized by comprising the following specific steps:
A. firstly, drilling downwards on the ground by using a drilling machine, so that a drilled hole penetrates through an overburden stratum to reach a dry hot rock reservoir to form a vertical shaft, and the vertical shaft is divided into an overburden stratum section and a dry hot rock reservoir section;
B. installing a directional drill bit on a drilling machine, extending the directional drill bit into the hot dry rock reservoir, sequentially drilling the directional drill bit at different depths of the hot dry rock reservoir along the same horizontal direction from a vertical shaft to form three horizontal drilling wells, respectively setting the three horizontal drilling wells as a first horizontal drilling well, a second horizontal drilling well and a third horizontal drilling well from top to bottom, and discharging slag and slurry during the back drilling; drilling a monitoring well from the ground by using a drilling machine, and enabling the final hole position of the monitoring well to be located in an overlying stratum right above the first horizontal drilling well;
C. installing a high-pressure sealer at the junction of the overburden section and the dry and hot rock reservoir section of the vertical shaft to seal the dry and hot rock reservoir section of the vertical shaft; then, one end of a heat insulation liquid injection pipe and one end of a heat insulation extraction pipe both extend into the vertical well and penetrate through the high-pressure sealer, wherein one end of the heat insulation liquid injection pipe extends into a second horizontal well, and a temperature-resistant pressure packer is installed at one end of the heat insulation liquid injection pipe to plug the second horizontal well; one end of the heat insulation extraction pipe is positioned in a dry and hot rock reservoir section of the vertical shaft;
D. the other end of the heat-insulating liquid injection pipe and CO 2 The outlet of the pump body is connected, the other end of the heat insulation extraction pipe is connected with the inlet of the heat exchanger, the heat discharge port of the heat exchanger is connected with the power generation device through the heat transfer pipeline, the fluid discharge port of the heat exchanger is connected with one end of the low-temperature condensation pipe, and the other end of the low-temperature condensation pipe is connected with the CO 2 The inlet of the pump body is connected, then the monitoring device is sent to the final hole position of the monitoring well, the monitoring device is connected with the multisource data inversion system on the ground through an optical fiber data transmission line, and the multiphase CO is completed 2 Laying a geothermal exploitation system;
E. when geothermal exploitation work is started, CO is started first 2 Pumping the pump body for a period of time to pump the high-pressure low-temperature liquid CO in the low-temperature condensation pipe 2 Injecting fluid into the second horizontal well via the insulated injection pipe, low temperature liquid CO 2 The fluid is continuously heated in the second horizontal well under the influence of geothermal temperature, and liquid CO is obtained 2 The fluid absorbs heat and undergoes transient phase change to form CO 2 Gas, because the second horizontal drilling well is blocked, the generated high-pressure expansion effect impacts and cracks the hot dry rock around the second horizontal drilling well to complete one impact cracking process, and then the process is repeated to restart CO 2 After the pump body is subjected to a plurality of times of cyclic fracturing processes for a period of time, the hot dry rock around the second horizontal drilling well forms a complex fracture network, meanwhile, the monitoring device monitors the geological condition below the second horizontal drilling well in real time, the monitoring data are fed back to the multi-source data inversion system to determine the fracturing condition of the geothermal layer according to the monitoring data, and the CO is adjusted according to the fracturing condition 2 The injection pressure and the injection flow of the pump body are controlled until the second horizontal drilling well is communicated with the first horizontal drilling well and the third horizontal drilling well through the fracture network respectively, and the CO is stopped 2 The pump body finishes the cracking process;
F. when the fracture network interpenetrates the first horizontal well, the second horizontal well and the third horizontal well, the liquid CO is injected due to continuous multiple circulation 2 The liquid CO is generated by the combined action of geothermal temperature and pressure generated by gasification 2 Fluid phase change to CO 2 The gas will become CO in a supercritical state 2 The fluid, then CO in the supercritical state due to the lower gas pressure in the first horizontal well and the third horizontal well 2 The fluid enters a first horizontal well and a third horizontal well along the fracture network, continuously absorbs heat, and finally enters an insulated extraction pipe through a vertical well;
G. high temperature CO 2 Fluid enters the heat exchanger through the heat insulation extraction pipe, separated heat in the heat exchanger enters the power generation device through the heat transfer pipeline in the radiation heat exchange process to generate power, and the cooled CO after heat exchange is finished 2 The gas enters the low-temperature condenser pipe, and the CO is cooled by the low-temperature condenser pipe 2 Gas re-liquefaction into liquid CO 2 Storing;
H. and E, when the heat value separated by the heat exchanger is lower than a set value, repeating the steps from E to G, so that the heat value separated by the heat exchanger is increased, and circulating the steps in such a way, and finally realizing the geothermal exploitation of the dry hot rock.
2. The method of claim 1 based on multiphase CO 2 The horizon-type geothermal intensified mining method is characterized in that the monitoring deviceThe device comprises a microseismic monitoring probe, an ultrasonic probe and a gas monitoring probe, wherein each probe is used for isolating high temperature by adopting a thermal insulation wrapping mode.
3. The multiphase CO-based fuel as claimed in claim 1 2 The method for the horizon type geothermal enhanced exploitation is characterized in that the drilling diameters of the first horizontal drilling well, the second horizontal drilling well and the third horizontal drilling well are all 150-180mm, and the drilling lengths are all in the range of 200-300 m.
4. The method of claim 1 based on multiphase CO 2 The horizon type geothermal energy intensified mining method is characterized in that the azimuth angle error of the first horizontal well, the second horizontal well and the third horizontal well on the spatial horizon is less than 5 degrees, the third horizontal well is arranged at the bottom position of the vertical shaft, and the second horizontal well and the first horizontal well are respectively arranged at the positions of 60m and 120m above the third horizontal well.
5. The multiphase CO-based fuel as claimed in claim 1 2 The horizon type geothermal strengthening exploitation method is characterized in that the maximum withstand pressure of the high-pressure sealer is 150MPa, and the maximum withstand temperature is 500 ℃.
6. The multiphase CO-based fuel as claimed in claim 1 2 The horizon type geothermal strengthening exploitation method is characterized in that the maximum temperature which the temperature and pressure resistant packer can bear is 600 ℃, and the maximum pressure is 200Mpa.
7. The method of claim 1 based on multiphase CO 2 The horizon type geothermal energy reinforced exploitation method is characterized in that the heat insulation liquid injection pipe and the heat insulation extraction pipe are both made of flexible materials, and the maximum temperature capable of being borne by the heat insulation liquid injection pipe and the heat insulation extraction pipe is 500 ℃; the pipe diameter of the heat-insulation liquid injection pipe is 80mm, and the pipe diameter of the heat-insulation extraction pipe is 150mm.
8. A method according to claim 1, based on multiple phasesCO 2 The horizon-type geothermal enhanced mining method of (1), characterized in that the CO is 2 The adjustable range of the injection pressure of the pump body is 10-70MPa, and the injection flow range is 5-10L/min.
CN202210491063.6A 2022-05-07 2022-05-07 Based on heterogeneous state CO 2 Horizon type geothermal strengthening mining method Active CN114673479B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210491063.6A CN114673479B (en) 2022-05-07 2022-05-07 Based on heterogeneous state CO 2 Horizon type geothermal strengthening mining method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210491063.6A CN114673479B (en) 2022-05-07 2022-05-07 Based on heterogeneous state CO 2 Horizon type geothermal strengthening mining method

Publications (2)

Publication Number Publication Date
CN114673479A CN114673479A (en) 2022-06-28
CN114673479B true CN114673479B (en) 2022-11-08

Family

ID=82080725

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210491063.6A Active CN114673479B (en) 2022-05-07 2022-05-07 Based on heterogeneous state CO 2 Horizon type geothermal strengthening mining method

Country Status (1)

Country Link
CN (1) CN114673479B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116163695B (en) * 2022-07-12 2024-03-08 四川大学 Method for cooperatively building dry-hot rock artificial heat storage by microwave radiation and dry ice jet
CN117307121B (en) * 2023-09-26 2024-05-24 中国矿业大学 Supercritical CO2Closed-loop mining method for dry-hot rock and carbon sequestration of complete reservoir

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106978993A (en) * 2017-05-16 2017-07-25 中国地质大学(武汉) A kind of medium and deep sandstone underground heat horizontal well recovery method and structure
CN207230981U (en) * 2017-04-17 2018-04-13 山西泰杰地能干热岩有限公司 A kind of ground can hot dry rock heat-exchanger rig monitoring system
CN108302833A (en) * 2017-08-31 2018-07-20 环和地能创新科技有限公司 Closed deep geothermal heat energy acquisition system and method
CN111155979A (en) * 2019-12-31 2020-05-15 山东科技大学 Synergistic construction of hot dry rock artificial thermal storage by hydraulic fracturing and millisecond differential blasting
CN112502687A (en) * 2020-12-17 2021-03-16 中国地质调查局水文地质环境地质调查中心 Artificial heat storage construction system and method for group-hole dry hot rock
CN213838602U (en) * 2020-12-17 2021-07-30 中国地质调查局水文地质环境地质调查中心 Artificial heat storage building system for group-hole dry hot rock
CN113738317A (en) * 2021-10-14 2021-12-03 中国矿业大学 Method for combined exploitation of deep coal bed gas and dry hot rock type geothermal
CN114033346A (en) * 2021-10-26 2022-02-11 中国地质大学(武汉) A deep geothermal mining method based on carbon dioxide medium

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070050041A (en) * 2004-06-23 2007-05-14 해리 비. 컬레트 Underground geothermal reservoir development and creation method
CA3100013C (en) * 2020-04-21 2023-03-14 Eavor Technologies Inc. Method for forming high efficiency geothermal wellbores using phase change materials

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207230981U (en) * 2017-04-17 2018-04-13 山西泰杰地能干热岩有限公司 A kind of ground can hot dry rock heat-exchanger rig monitoring system
CN106978993A (en) * 2017-05-16 2017-07-25 中国地质大学(武汉) A kind of medium and deep sandstone underground heat horizontal well recovery method and structure
CN108302833A (en) * 2017-08-31 2018-07-20 环和地能创新科技有限公司 Closed deep geothermal heat energy acquisition system and method
CN111155979A (en) * 2019-12-31 2020-05-15 山东科技大学 Synergistic construction of hot dry rock artificial thermal storage by hydraulic fracturing and millisecond differential blasting
CN112502687A (en) * 2020-12-17 2021-03-16 中国地质调查局水文地质环境地质调查中心 Artificial heat storage construction system and method for group-hole dry hot rock
CN213838602U (en) * 2020-12-17 2021-07-30 中国地质调查局水文地质环境地质调查中心 Artificial heat storage building system for group-hole dry hot rock
CN113738317A (en) * 2021-10-14 2021-12-03 中国矿业大学 Method for combined exploitation of deep coal bed gas and dry hot rock type geothermal
CN114033346A (en) * 2021-10-26 2022-02-11 中国地质大学(武汉) A deep geothermal mining method based on carbon dioxide medium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
超临界二氧化碳在地热开发中的应用研究进展;刘松泽等;《应用化工》;20200610(第06期);全文 *

Also Published As

Publication number Publication date
CN114673479A (en) 2022-06-28

Similar Documents

Publication Publication Date Title
CN110318675B (en) A method of thermal co-mining of deep coalbed methane
CN106337672B (en) A kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing
CN112523735B (en) Fracturing method for shale reservoir transformation
CN110173246B (en) Method for improving heat recovery rate by alternately fatigue fracturing dry hot rock by water and liquid nitrogen
CN105863569A (en) Single-well fracture gravity self-circulation dry-hot-rock geotherm mining method
CN107816340B (en) Process method for thermally extracting shale gas by combining high-power ultrasonic waves with branch horizontal well
CN105863568A (en) Method for exploring dry-hot-rock geotherm through underground heat siphon self-circulation
CN106640028A (en) Completion method of enhanced geothermal system through communication and circulation of two wells
CN107100605A (en) A kind of method that dual horizontal well circulation supercritical carbon dioxide develops hot dry rock
CN114673479B (en) Based on heterogeneous state CO 2 Horizon type geothermal strengthening mining method
CN108756839B (en) In-situ conversion method and system for oil shale heat insulation and efficiency enhancement
CN111911224B (en) Hot gas co-mining method for deep coal seam roof drilling coal
CN109505577B (en) Hot dry rock mining method
CN107130944B (en) A method of employing geothermal energy exploitation of gas hydrate hiding in the way of fluid circulation
CN106894804A (en) A kind of enhanced geothermal system completion method of standing column well
CN114856518A (en) Method for increasing production of coal bed gas by using medium-low enthalpy dry rock geothermal energy
CN106014357A (en) Oil gas slice mining method through in-situ heat injection in oil shale thick ore bed
CN111577229A (en) Method for developing dry hot rock by high-pressure water jet radial injection composite fracturing
CN111637652A (en) An underground artificial double convection heat storage structure
CN111022014A (en) A method for developing hot dry rock resources using gravity drainage technology
CN207348838U (en) A kind of enhanced underground heat completion system of standing column well
CN112065343B (en) Shale oil development injection and production system and method
CN110360761A (en) A kind of tree-shaped hot dry rock well construction and recovery method
CN218862589U (en) A Synchronous Injection-production String Structure for a Horizontal Well in Dry Hot Rock
CN115853488A (en) Multistage fracturing method for reducing cracking pressure of dry hot rock reservoir by using supercritical water

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant