WO2023124897A1 - Annulus water injection distributed spray cooling method for high-temperature underground gas - Google Patents

Annulus water injection distributed spray cooling method for high-temperature underground gas Download PDF

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WO2023124897A1
WO2023124897A1 PCT/CN2022/137839 CN2022137839W WO2023124897A1 WO 2023124897 A1 WO2023124897 A1 WO 2023124897A1 CN 2022137839 W CN2022137839 W CN 2022137839W WO 2023124897 A1 WO2023124897 A1 WO 2023124897A1
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underground gas
temperature
nozzle
cooling
nozzles
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PCT/CN2022/137839
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French (fr)
Chinese (zh)
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袁光杰
车阳
刘奕杉
乔磊
林盛杰
何爱国
王辰龙
王开龙
董胜祥
杜卫强
郑李
李萍
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中国石油天然气集团有限公司
中国石油集团工程技术研究院有限公司
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Publication of WO2023124897A1 publication Critical patent/WO2023124897A1/en

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
    • E21B36/001—Cooling arrangements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Definitions

  • the invention relates to the technical field of high-temperature underground gas, in particular to a distributed spray cooling method for high-temperature underground gas annulus water injection.
  • Underground coal gasification is an efficient and clean in-situ chemical mining technology for coal. It has technical advantages such as good safety, low investment, high efficiency, and less pollution. At this stage, it is preferentially applicable to deep coal seams, unminable coal seams and uneconomic mining The development and utilization of coal resources has broad application prospects.
  • the principle of underground coal gasification is to make coal with a depth of nearly one thousand meters directly undergo gasification reaction in an underground gasifier to produce a high-temperature and high-pressure mixed gas of up to 1000°C and 10MPa, which is exported from the production well to the ground through gas transportation. , to complete the underground coal mining process. Since the high-temperature and high-pressure gas mixture has very high requirements on ground equipment and instruments, it is necessary to cool down the gas mixture to a certain extent to meet the requirements of the ground system. There are still many key issues that need to be solved urgently for the further popularization and application of underground coal gasification technology, and cooling the high-temperature and high-pressure mixed gas in the production well is one of the key links in the mining process.
  • the present inventor proposes a distributed spray cooling method for high-temperature underground coal gas annulus water injection to meet the needs of popularization and application of underground coal gasification technology.
  • the object of the present invention is to provide a distributed spray cooling and cooling method for high-temperature underground gas annular water injection.
  • the cooling water in the annular water column area passes through the nozzle on the production oil pipe to form water droplets in an atomized state, which is fully mixed with the high-temperature and high-pressure gas in the inner cavity of the production oil pipe.
  • Contact can complete heat exchange in an instant, thereby realizing cooling of high-temperature and high-pressure gas; through appropriate cooling and cooling methods, combined with reasonable nozzle arrangement, the high-temperature and high-pressure gas in the production well can be cooled according to system requirements and meet system operation requirements. It has brought great convenience to the implementation of engineering schemes.
  • the invention provides a distributed spray cooling method for high-temperature underground coal gas annulus water injection, comprising: inserting a production oil pipe into the annulus water pipe, forming an annular water column area between the annulus water pipe and the production oil pipe, and forming a high temperature in the inner cavity of the production oil pipe.
  • Underground gas production channel; the production oil pipe is provided with multiple nozzles, and the cooling water in the annular water column area is atomized and sprayed into the inner cavity of the production oil pipe through the nozzles to complete the spray cooling of high-temperature underground gas.
  • the high-temperature underground gas annulus water injection distributed spray cooling cooling method of the present invention is suitable for the application of underground coal gasification engineering, and has the following beneficial effects:
  • the cooling water in the annular water column area forms water droplets in an atomized state through the nozzles on the production tubing, fully contacting the high-temperature and high-pressure gas in the inner cavity of the production tubing, and can complete heat exchange in an instant, thereby cooling the high-temperature and high-pressure gas;
  • the high temperature and high pressure gas in the production well can be cooled according to the system requirements to meet the system operation requirements;
  • the water injection flow rate and nozzle flow rate of the ground system can be adjusted according to the gas production rate, the temperature and pressure of the underground gas produced by the wellhead, and the ground system realizes real-time dynamic adjustment and closed-loop intelligent control;
  • the flat nozzles can effectively alleviate the problem of nozzle clogging, and can also achieve a certain atomization effect, while greatly reducing the cost of equipment development;
  • the cooling water achieves a better optimized atomization effect through the impact in the nozzle; the nozzles are evenly distributed through the ring, and the distance between the nozzles of each layer is set reasonably, which can cover a relatively wide area and ensure rapid cooling;
  • the high-temperature underground gas annular water injection distributed spray cooling cooling method of the present invention is simple and easy to implement, and the cooling of high-temperature and high-pressure gas can be realized through a layer of annular water pipe casing, which brings great convenience to the implementation of engineering schemes.
  • Figure 1 is a schematic diagram of the implementation process of the high-temperature underground gas annulus water injection distributed spray cooling cooling method of the present invention.
  • Figure 2 is a sectional view of the nozzle of the present invention.
  • Fig. 3 is a flow chart of the dynamic adjustment of the ground system water injection flow rate and nozzle flow rate in step b of the present invention.
  • the present invention provides a distributed spray cooling method for high-temperature underground gas annulus water injection, which includes: inserting the production oil pipe 1 into the annular water pipe 2, forming a ring between the annular water pipe 2 and the production oil pipe 1 Water column area 3 (the interior is filled with cooling water at normal temperature, and the flow and pressure of the cooling water during system operation are provided by the ground system), the inner cavity of the production oil pipe 1 forms a high-temperature underground gas production channel; the production oil pipe 1 is equipped with multiple nozzles 4, and the annular water column The cooling water in zone 3 is atomized and sprayed into the inner cavity of the production oil pipe through the nozzle to complete the spray cooling of the high-temperature underground gas.
  • the high-temperature underground coal gas annulus water injection distributed spray cooling cooling method mainly solves a key technical problem existing in the underground coal gasification technology. Due to the obvious advantages of underground coal gasification technology, it is one of the mainstream directions of underground coal mining in the future. Therefore, developing an efficient and feasible high-temperature underground gas cooling method is the development trend of underground coal gasification technology. Provide support for the development and application of underground coal gasification technology.
  • the high-temperature underground coal gas annulus water injection distributed spray cooling cooling method of the present invention is suitable for the application of underground coal gasification engineering, and has the following outstanding advantages: the cooling water in the annular water column area forms water droplets in an atomized state through the nozzles on the production oil pipe, and is compatible with production
  • the high-temperature and high-pressure gas in the inner cavity of the tubing is fully contacted, and heat exchange can be completed in an instant, thereby cooling the high-temperature and high-pressure gas; through appropriate cooling and cooling methods, combined with reasonable nozzle arrangement, the high-temperature and high-pressure gas in the production well can be in accordance with system requirements.
  • the distributed spray cooling cooling method of high-temperature underground gas annulus water injection of the present invention is simple and easy to implement, and the cooling of high-temperature and high-pressure gas can be realized through a layer of annulus water pipe casing, which is an engineering solution. Brings great convenience.
  • the high-temperature underground gas annulus water injection distributed spray cooling cooling method of the present invention comprises the following steps:
  • Step a insert the production tubing 1 into the annular water pipe 2, record the initial water injection flow Q 0 of the surface system, the initial temperature T 0 of the underground gas produced by the wellhead, and the initial pressure P 0 of the underground gas produced by the wellhead;
  • the ground system (existing ground system can be used) provides cooling water flow and pressure for the annular water column area.
  • the production oil pipe 1 and the annular water pipe 2 are arranged coaxially.
  • Step b injecting water into the annular water column area 3, spraying cooling water into the inner cavity of the production tubing through the nozzle 4; adjusting the water injection flow rate (spray amount) and nozzle flow rate of the ground system in real time;
  • the water injection flow rate (spray volume) and nozzle flow rate of the ground system can be adjusted according to the gas production rate, the temperature and pressure of the underground gas produced by the wellhead, and the ground system realizes real-time dynamic adjustment and closed-loop intelligent control.
  • the water injection flow is adjusted through the PID control of the surface system.
  • the water injection flow adjustment value is ⁇ Q
  • V i Vn i ;
  • M is (t);
  • Q w The heat release of 1 ton of water from normal temperature to the temperature of crude gas at the wellhead, kJ/t;
  • T 1 wellhead temperature, 320 ⁇ 350°C;
  • ⁇ i the density of the i-th component of crude gas under standard conditions
  • V i the volume of the i-th component of crude gas
  • n i volume percentage of the i-th component of crude gas
  • V the daily output under crude gas standard conditions, 50,000 to 300,000 cubic meters per day.
  • V s Q 1 /(nA)
  • n the number of nozzles
  • the atomization condition of the cooling water passing through the nozzle 4 can be determined by the nozzle flow rate V s , and the nozzle flow rate can be adjusted in real time by adjusting the real-time water injection flow rate.
  • Step c the cooling water passes through the nozzle 4 to form water droplets in an atomized state, and the water droplets fully contact with the high-temperature underground gas to complete heat exchange in an instant, thereby realizing the cooling of the high-temperature underground gas.
  • the inlet of the nozzle 4 is located in the annular water column area 3
  • the outlet of the nozzle 4 is located in the inner cavity of the production oil pipe
  • the inlet pressure of the nozzle is greater than the outlet pressure of the nozzle
  • the cooling water in the annular water column area 3 is affected by the pressure difference between the nozzle inlet and outlet.
  • the downjet is injected into the inner cavity of the production tubing, and the inlet pressure of the nozzle and the outlet pressure of the nozzle are regulated and controlled by the surface system.
  • the nozzle 4 is a flat nozzle, and the flat nozzle 4 is composed of a stepped pipe structure on the side wall of the production tubing. It is economical and convenient to adopt the water spray atomization scheme of processing distributed flat nozzles directly on the production oil pipe; the flat nozzles can effectively alleviate the problem of nozzle clogging, and can also achieve a certain atomization effect, while greatly reducing the cost of equipment development.
  • the flat nozzle includes a small-diameter section 41 and a large-diameter section 42, the small-diameter section 41 is arranged close to the inner chamber of the production tubing, the inlet of the large-diameter section 42 constitutes the inlet of the nozzle, and the outlet of the small-diameter section 41 constitutes the outlet of the nozzle.
  • Outlet; the axial length dimension of the flat nozzle is set to be the same as the side wall thickness dimension t of the production tubing.
  • the axial length of the small-diameter section 41 is L, the diameter of the small-diameter section 41 is d, and the diameter of the large-diameter section 42 is D.
  • d is 3.5 mm.
  • a transition chamfer 43 is provided between the small diameter section 41 and the large diameter section 42, and the angle of the transition chamfer 43 is 120°.
  • the cooling water in the annular water column area 3 enters from the entrance of the large-diameter section 42 and hits the surface of the transition chamfer 43.
  • the cooling water achieves a better optimized atomization effect through the impact; the cooling water enters the small-diameter section 41 from the large-diameter section 42, The spray pressure of cooling water has been increased.
  • multiple nozzles 4 are grouped and arranged at intervals along the axial direction of the production tubing, each group has multiple nozzles, and multiple nozzles of each group are evenly spaced along the circumferential direction of the production tubing.
  • the nozzles are evenly distributed through the ring, and the distance between the nozzles of each layer is set reasonably, which can cover a relatively wide area and ensure rapid cooling.
  • the number of nozzles 4 is 35; 7 nozzles form a group, and the 7 nozzles of each group are evenly arranged along the circumference of the production tubing; the axial distance between two adjacent groups of nozzles 1m.
  • the high-temperature underground gas annulus water injection distributed spray cooling cooling method of the present invention is suitable for the application of underground coal gasification engineering, and has the following outstanding advantages:
  • the cooling water in the annular water column area forms water droplets in an atomized state through the nozzles on the production tubing, fully contacting the high-temperature and high-pressure gas in the inner cavity of the production tubing, and can complete heat exchange in an instant, thereby cooling the high-temperature and high-pressure gas;
  • the high temperature and high pressure gas in the production well can be cooled according to the system requirements to meet the system operation requirements;
  • the water injection flow rate and nozzle flow rate of the ground system can be adjusted according to the gas production rate, the temperature and pressure of the underground gas produced by the wellhead, and the ground system realizes real-time dynamic adjustment and closed-loop intelligent control;
  • the flat nozzles can effectively alleviate the problem of nozzle clogging, and can also achieve a certain atomization effect, while greatly reducing the cost of equipment development;
  • the cooling water achieves a better optimized atomization effect through the impact in the nozzle; the nozzles are evenly distributed through the ring, and the distance between the nozzles of each layer is set reasonably, which can cover a relatively wide area and ensure rapid cooling;
  • the high-temperature underground gas annular water injection distributed spray cooling cooling method of the present invention is simple and easy to implement, and the cooling of high-temperature and high-pressure gas can be realized through a layer of annular water pipe casing, which brings great convenience to the implementation of engineering schemes.
  • the above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

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Abstract

An annulus water injection distributed spray cooling method for high-temperature underground gas, the method comprising: inserting a production tubing (1) into an annulus water pipe (2), to form an annular water column area (3) between the annular water pipe (2) and the production tubing (1), and form a high-temperature underground gas production channel in an inner cavity of the production tubing (1); and arranging a plurality of nozzles (4) on the production tubing (1), and atomizing and spraying cooling water of the annular water column area (3) into the inner cavity of the production tubing (1) through the nozzles (4), to complete spray cooling of the high-temperature underground gas. The cooling water in the annular water column area (3) forms droplets in an atomized state by means of the nozzles (4) on the production tubing (1), and makes full contact with high-temperature and high-pressure gas in the inner cavity of the production tubing (1), such that heat exchange can be completed instantly, to cool the high-temperature and high-pressure gas.

Description

高温地下煤气环空注水分布式喷雾冷却降温方法Distributed Spray Cooling Method for High Temperature Underground Gas Annulus Water Injection
相关申请related application
本申请要求专利申请号为202111609819.4、申请日为2021年12月27日、发明名称为“高温地下煤气环空注水分布式喷雾冷却降温方法”的中国发明专利的优先权。This application claims the priority of the Chinese invention patent with the patent application number 202111609819.4, the application date is December 27, 2021, and the invention name is "Distributed Spray Cooling Method for High-temperature Underground Gas Annular Water Injection".
技术领域technical field
本发明涉及高温地下煤气技术领域，尤其涉及一种高温地下煤气环空注水分布式喷雾冷却降温方法。The invention relates to the technical field of high-temperature underground gas, in particular to a distributed spray cooling method for high-temperature underground gas annulus water injection.
背景技术Background technique
煤炭地下气化是一种高效清洁的煤炭原位化学开采技术，具有安全性好、投资少、效益高、污染少等技术优势，现阶段优先适用于深部煤层、不可采煤层以及不经济开采煤炭资源的开发利用，具有广阔的推广应用前景。Underground coal gasification is an efficient and clean in-situ chemical mining technology for coal. It has technical advantages such as good safety, low investment, high efficiency, and less pollution. At this stage, it is preferentially applicable to deep coal seams, unminable coal seams and uneconomic mining The development and utilization of coal resources has broad application prospects.
煤炭地下气化的原理是使深度将近千米的煤炭直接在地下气化炉中发生气化反应，产生高达1000℃、10MPa的高温高压混合气，通过气体输运的形式由生产井输出至地面，完成煤炭地下开采过程。由于高温高压混合气对地面设备和仪器要求非常高，需要对混合气进行一定程度的降温以达到地面系统的要求。煤炭地下气化技术进一步推广应用仍有许多关键问题亟需解决，而在开采过程中对生产井内的高温高压混合气体进行冷却降温是关键的环节之一。The principle of underground coal gasification is to make coal with a depth of nearly one thousand meters directly undergo gasification reaction in an underground gasifier to produce a high-temperature and high-pressure mixed gas of up to 1000°C and 10MPa, which is exported from the production well to the ground through gas transportation. , to complete the underground coal mining process. Since the high-temperature and high-pressure gas mixture has very high requirements on ground equipment and instruments, it is necessary to cool down the gas mixture to a certain extent to meet the requirements of the ground system. There are still many key issues that need to be solved urgently for the further popularization and application of underground coal gasification technology, and cooling the high-temperature and high-pressure mixed gas in the production well is one of the key links in the mining process.
因此，采用合适的冷却降温方式，使生产井内的高温高压气体满足系统运行要求，是煤炭地下气化技术推广应用的一大难题。Therefore, adopting a suitable cooling method to make the high-temperature and high-pressure gas in the production well meet the system operation requirements is a major problem in the promotion and application of underground coal gasification technology.
由此，本发明人凭借多年从事相关行业的经验与实践，提出一种高温地下煤气环空注水分布式喷雾冷却降温方法，满足煤炭地下气化技术推广应用的需求。Therefore, relying on many years of experience and practice in related industries, the present inventor proposes a distributed spray cooling method for high-temperature underground coal gas annulus water injection to meet the needs of popularization and application of underground coal gasification technology.
发明内容Contents of the invention
本发明的目的在于提供一种高温地下煤气环空注水分布式喷雾冷却降温方法，环形水柱区域的冷却水通过生产油管上的喷嘴形成雾化状态的水滴，与生产油管内腔的高温高压气体充分接触，可以在瞬间完成换热，从而对高温高压气体实现降温；通过合适的冷却降温方式，结合合理的喷嘴排布，使得生产井内的高温高压气体能够按照系统要求 进行降温，满足系统运行要求，为工程方案实施带来了极大的便利。The object of the present invention is to provide a distributed spray cooling and cooling method for high-temperature underground gas annular water injection. The cooling water in the annular water column area passes through the nozzle on the production oil pipe to form water droplets in an atomized state, which is fully mixed with the high-temperature and high-pressure gas in the inner cavity of the production oil pipe. Contact can complete heat exchange in an instant, thereby realizing cooling of high-temperature and high-pressure gas; through appropriate cooling and cooling methods, combined with reasonable nozzle arrangement, the high-temperature and high-pressure gas in the production well can be cooled according to system requirements and meet system operation requirements. It has brought great convenience to the implementation of engineering schemes.
本发明提供一种高温地下煤气环空注水分布式喷雾冷却降温方法，包括，将生产油管穿入环空水管内，环空水管与生产油管之间形成环形水柱区域，生产油管的内腔形成高温地下煤气生产通道；所述生产油管上设置多个喷嘴，环形水柱区域的冷却水通过所述喷嘴雾化喷射到生产油管的内腔，完成高温地下煤气的喷雾冷却降温。The invention provides a distributed spray cooling method for high-temperature underground coal gas annulus water injection, comprising: inserting a production oil pipe into the annulus water pipe, forming an annular water column area between the annulus water pipe and the production oil pipe, and forming a high temperature in the inner cavity of the production oil pipe. Underground gas production channel; the production oil pipe is provided with multiple nozzles, and the cooling water in the annular water column area is atomized and sprayed into the inner cavity of the production oil pipe through the nozzles to complete the spray cooling of high-temperature underground gas.
由上所述，本发明的高温地下煤气环空注水分布式喷雾冷却降温方法，适合煤炭地下气化工程应用，具有以下有益效果：From the above, the high-temperature underground gas annulus water injection distributed spray cooling cooling method of the present invention is suitable for the application of underground coal gasification engineering, and has the following beneficial effects:
环形水柱区域的冷却水通过生产油管上的喷嘴形成雾化状态的水滴，与生产油管内腔的高温高压气体充分接触，可以在瞬间完成换热，从而对高温高压气体实现降温；The cooling water in the annular water column area forms water droplets in an atomized state through the nozzles on the production tubing, fully contacting the high-temperature and high-pressure gas in the inner cavity of the production tubing, and can complete heat exchange in an instant, thereby cooling the high-temperature and high-pressure gas;
通过合适的冷却降温方式，结合合理的喷嘴排布，使得生产井内的高温高压气体能够按照系统要求进行降温，满足系统运行要求；Through appropriate cooling methods, combined with reasonable nozzle arrangement, the high temperature and high pressure gas in the production well can be cooled according to the system requirements to meet the system operation requirements;
地面系统注水流量和喷嘴流速可根据产气量、井口产出地下煤气的温度和压力调整，地面系统实现实时动态调整和闭环智能控制；The water injection flow rate and nozzle flow rate of the ground system can be adjusted according to the gas production rate, the temperature and pressure of the underground gas produced by the wellhead, and the ground system realizes real-time dynamic adjustment and closed-loop intelligent control;
采用直接在生产油管上加工分布式平口喷嘴的喷水雾化方案，经济简便；平口喷嘴可以有效缓解喷嘴阻塞的问题，还能够达到一定的雾化效果，同时大大降低的设备研制成本；It is economical and convenient to use the water spray atomization scheme of processing distributed flat nozzles directly on the production oil pipe; the flat nozzles can effectively alleviate the problem of nozzle clogging, and can also achieve a certain atomization effect, while greatly reducing the cost of equipment development;
冷却水通过在喷嘴内的撞击实现更好的优化雾化效果；喷嘴通过环形均匀分布，同时合理设置各层喷嘴之间的距离，可以覆盖相对较广的区域，又能保证能够快速降温；The cooling water achieves a better optimized atomization effect through the impact in the nozzle; the nozzles are evenly distributed through the ring, and the distance between the nozzles of each layer is set reasonably, which can cover a relatively wide area and ensure rapid cooling;
本发明的高温地下煤气环空注水分布式喷雾冷却降温方法简单易实施，通过一层环空水管的套管即可实现高温高压气体的冷却，这为工程方案实施带来了极大的便利。The high-temperature underground gas annular water injection distributed spray cooling cooling method of the present invention is simple and easy to implement, and the cooling of high-temperature and high-pressure gas can be realized through a layer of annular water pipe casing, which brings great convenience to the implementation of engineering schemes.
附图说明Description of drawings
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.
其中：in:
图1：为本发明的高温地下煤气环空注水分布式喷雾冷却降温方法实施过程示意图。Figure 1 is a schematic diagram of the implementation process of the high-temperature underground gas annulus water injection distributed spray cooling cooling method of the present invention.
图2：为本发明的喷嘴的剖视图。Figure 2: is a sectional view of the nozzle of the present invention.
图3：为本发明的步骤b中地面系统注水流量和喷嘴流速动态调节流程图。Fig. 3 is a flow chart of the dynamic adjustment of the ground system water injection flow rate and nozzle flow rate in step b of the present invention.
具体实施方式Detailed ways
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图说明本发明的具体实施方式。In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.
在此描述的本发明的具体实施方式，仅用于解释本发明的目的，而不能以任何方式理解成是对本发明的限制。在本发明的教导下，技术人员可以构想基于本发明的任意可能的变形，这些都应被视为属于本发明的范围。需要说明的是，当元件被称为“设置于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。术语“安装”、“相连”、“连接”应做广义理解，例如，可以是机械连接或电连接，也可以是两个元件内部的连通，可以是直接相连，也可以通过中间媒介间接相连，对于本领域的普通技术人员而言，可以根据具体情况理解上述术语的具体含义。本文所使用的术语“垂直的”、“水平的”、“上”、“下”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。The specific implementations of the present invention described here are only for the purpose of explaining the present invention, and should not be construed as limiting the present invention in any way. Under the teaching of the present invention, the skilled person can conceive any possible modification based on the present invention, and these should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted", "connected" and "connected" should be interpreted in a broad sense, for example, it may be a mechanical connection or an electrical connection, or it may be the internal communication of two components, either directly or indirectly through an intermediary, Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiments.
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本申请。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is only for the purpose of describing specific embodiments, and is not intended to limit the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
如图1所示，本发明提供一种高温地下煤气环空注水分布式喷雾冷却降温方法，包括，将生产油管1穿入环空水管2内，环空水管2与生产油管1之间形成环形水柱区域3(内部充满常温冷却水，系统运行中冷却水的流量及压力由地面系统提供)，生产油管1的内腔形成高温地下煤气生产通道；生产油管1上设置多个喷嘴4，环形水柱区域3的冷却水通过喷嘴雾化喷射到生产油管的内腔，完成高温地下煤气的喷雾冷却降温。As shown in Figure 1, the present invention provides a distributed spray cooling method for high-temperature underground gas annulus water injection, which includes: inserting the production oil pipe 1 into the annular water pipe 2, forming a ring between the annular water pipe 2 and the production oil pipe 1 Water column area 3 (the interior is filled with cooling water at normal temperature, and the flow and pressure of the cooling water during system operation are provided by the ground system), the inner cavity of the production oil pipe 1 forms a high-temperature underground gas production channel; the production oil pipe 1 is equipped with multiple nozzles 4, and the annular water column The cooling water in zone 3 is atomized and sprayed into the inner cavity of the production oil pipe through the nozzle to complete the spray cooling of the high-temperature underground gas.
本发明的高温地下煤气环空注水分布式喷雾冷却降温方法，主要是解决地下煤炭气化技术中存在的一个关键技术问题。由于地下煤炭气化技术的各项优势明显，是未来地下煤炭开采的主流方向之一，因此开发一种高效可行的高温地下煤气降温方法是地下煤炭气化技术发展的趋势，这也会为我国在地下煤炭气化技术的发展与应用推广提供助力。The high-temperature underground coal gas annulus water injection distributed spray cooling cooling method mainly solves a key technical problem existing in the underground coal gasification technology. Due to the obvious advantages of underground coal gasification technology, it is one of the mainstream directions of underground coal mining in the future. Therefore, developing an efficient and feasible high-temperature underground gas cooling method is the development trend of underground coal gasification technology. Provide support for the development and application of underground coal gasification technology.
本发明的高温地下煤气环空注水分布式喷雾冷却降温方法，适合煤炭地下气化工程 应用，具有以下突出优点：环形水柱区域的冷却水通过生产油管上的喷嘴形成雾化状态的水滴，与生产油管内腔的高温高压气体充分接触，可以在瞬间完成换热，从而对高温高压气体实现降温；通过合适的冷却降温方式，结合合理的喷嘴排布，使得生产井内的高温高压气体能够按照系统要求进行降温，满足系统运行要求；本发明的高温地下煤气环空注水分布式喷雾冷却降温方法简单易实施，通过一层环空水管的套管即可实现高温高压气体的冷却，这为工程方案实施带来了极大的便利。The high-temperature underground coal gas annulus water injection distributed spray cooling cooling method of the present invention is suitable for the application of underground coal gasification engineering, and has the following outstanding advantages: the cooling water in the annular water column area forms water droplets in an atomized state through the nozzles on the production oil pipe, and is compatible with production The high-temperature and high-pressure gas in the inner cavity of the tubing is fully contacted, and heat exchange can be completed in an instant, thereby cooling the high-temperature and high-pressure gas; through appropriate cooling and cooling methods, combined with reasonable nozzle arrangement, the high-temperature and high-pressure gas in the production well can be in accordance with system requirements. cooling to meet the requirements of system operation; the distributed spray cooling cooling method of high-temperature underground gas annulus water injection of the present invention is simple and easy to implement, and the cooling of high-temperature and high-pressure gas can be realized through a layer of annulus water pipe casing, which is an engineering solution. Brings great convenience.
进一步，本发明的高温地下煤气环空注水分布式喷雾冷却降温方法，包括以下步骤：Further, the high-temperature underground gas annulus water injection distributed spray cooling cooling method of the present invention comprises the following steps:
步骤a、将生产油管1穿入环空水管2内，记录地面系统初始注水流量Q 0、井口产出地下煤气初始温度T 0和井口产出地下煤气初始压力P 0； Step a, insert the production tubing 1 into the annular water pipe 2, record the initial water injection flow Q 0 of the surface system, the initial temperature T 0 of the underground gas produced by the wellhead, and the initial pressure P 0 of the underground gas produced by the wellhead;
地面系统(可采用现有的地面系统)为环形水柱区域提供冷却水流量及压力。The ground system (existing ground system can be used) provides cooling water flow and pressure for the annular water column area.
在本实施方式中，生产油管1和环空水管2同轴设置。In this embodiment, the production oil pipe 1 and the annular water pipe 2 are arranged coaxially.
步骤b、向环形水柱区域3内注水，通过喷嘴4将冷却水喷射到生产油管的内腔；实时调节地面系统注水流量(喷淋量)和喷嘴流速；Step b, injecting water into the annular water column area 3, spraying cooling water into the inner cavity of the production tubing through the nozzle 4; adjusting the water injection flow rate (spray amount) and nozzle flow rate of the ground system in real time;
具体地，实时调节地面系统注水流量(喷淋量)和喷嘴流速时，需要比较井口产出地下煤气实时动态温度T 1与设定的井口产出地下煤气目标温度T d的差异(同时比较井口产出地下煤气压力与目标压力的差异)，通过地面系统控制调节实时注水流量Q 1和喷嘴流速V s。 Specifically, when adjusting the water injection flow rate (spray volume) and nozzle flow rate of the surface system in real time, it is necessary to compare the difference between the real-time dynamic temperature T 1 of the underground gas produced at the wellhead and the set target temperature T d of the underground gas produced at the wellhead (while comparing the The difference between the output underground gas pressure and the target pressure), and adjust the real-time water injection flow rate Q 1 and nozzle flow rate V s through the surface system control.
地面系统注水流量(喷淋量)和喷嘴流速可根据产气量、井口产出地下煤气的温度和压力调整，地面系统实现实时动态调整和闭环智能控制。The water injection flow rate (spray volume) and nozzle flow rate of the ground system can be adjusted according to the gas production rate, the temperature and pressure of the underground gas produced by the wellhead, and the ground system realizes real-time dynamic adjustment and closed-loop intelligent control.
根据井口产出地下煤气的温度和压力情况，通过地面系统PID控制，调节注水流量，注水流量调节值为ΔQ，此时实际注水流量Q 1＝Q 0+ΔQ。 According to the temperature and pressure of the underground gas produced by the wellhead, the water injection flow is adjusted through the PID control of the surface system. The water injection flow adjustment value is ΔQ, and the actual water injection flow rate is Q 1 =Q 0 +ΔQ.
前述相关参数的计算如下：The calculation of the aforementioned related parameters is as follows:
初始注水流量(t/s)：Initial water injection flow rate (t/s):
Q 0＝M/(24×3600)； Q 0 =M/(24×3600);
M＝Q a/Q w； M= Qa / Qw ;
Figure PCTCN2022137839-appb-000001
Figure PCTCN2022137839-appb-000001
V i＝Vn i； V i =Vn i ;
其中：M为(t)；Among them: M is (t);
M——初始注水量，t；M——initial water injection volume, t;
Q a——粗煤气井底温度到井口温度变化的放热，kJ； Q a ——The heat release from the bottom hole temperature to the wellhead temperature of crude gas, kJ;
Q w——l吨水从常温变化到井口粗煤气温度的放热，kJ/t； Q w ——The heat release of 1 ton of water from normal temperature to the temperature of crude gas at the wellhead, kJ/t;
C Pi(T)——粗煤气第i个组分在温度T时的定压比热，kJ/(kg·K)； C Pi (T)——Constant pressure specific heat of the i-th component of crude gas at temperature T, kJ/(kg K);
T 1——井口温度，320～350℃； T 1 ——wellhead temperature, 320～350℃;
T 2——井底温度，400～1000℃； T 2 - Bottomhole temperature, 400-1000°C;
ρ i——粗煤气第i个组分标况下的密度； ρ i ——the density of the i-th component of crude gas under standard conditions;
V i——粗煤气第i个组分的体积； V i ——the volume of the i-th component of crude gas;
n i——粗煤气第i个组分的体积百分比； n i ——volume percentage of the i-th component of crude gas;
V——粗煤气标况下的日产量，5-30万方/天。V——the daily output under crude gas standard conditions, 50,000 to 300,000 cubic meters per day.
喷嘴平均流速V s(m/s): Nozzle average velocity V s (m/s):
V s＝Q 1/(nA) V s =Q 1 /(nA)
其中：in:
n——喷嘴个数；n - the number of nozzles;
A——喷嘴出口面积，m 2。 A——Nozzle outlet area, m 2 .
通过喷嘴流速V s可以判定冷却水经过喷嘴4形成的雾化情况，可通过调节实时注水流量实时调节喷嘴流速。 The atomization condition of the cooling water passing through the nozzle 4 can be determined by the nozzle flow rate V s , and the nozzle flow rate can be adjusted in real time by adjusting the real-time water injection flow rate.
地面系统注水流量(喷淋量)和喷嘴流速动态调节流程图如图3所示。The flow chart of the dynamic adjustment of water injection flow (spray volume) and nozzle flow rate in the surface system is shown in Figure 3.
步骤c、冷却水通过喷嘴4形成雾化状态的水滴，水滴与高温地下煤气充分接触，在瞬间完成换热，实现高温地下煤气降温。Step c, the cooling water passes through the nozzle 4 to form water droplets in an atomized state, and the water droplets fully contact with the high-temperature underground gas to complete heat exchange in an instant, thereby realizing the cooling of the high-temperature underground gas.
进一步，喷嘴4的进口位于环形水柱区域3内，喷嘴4的出口位于生产油管的内腔，喷嘴的进口压力大于喷嘴的出口压力，环形水柱区域3的冷却水在喷嘴进口和出口压力差的作用下喷射到生产油管的内腔，喷嘴的进口压力和喷嘴的出口压力通过地面系统调 节控制。Further, the inlet of the nozzle 4 is located in the annular water column area 3, the outlet of the nozzle 4 is located in the inner cavity of the production oil pipe, the inlet pressure of the nozzle is greater than the outlet pressure of the nozzle, and the cooling water in the annular water column area 3 is affected by the pressure difference between the nozzle inlet and outlet. The downjet is injected into the inner cavity of the production tubing, and the inlet pressure of the nozzle and the outlet pressure of the nozzle are regulated and controlled by the surface system.
进一步，喷嘴4为平口喷嘴，平口喷嘴4由生产油管的侧壁上的阶梯管结构构成。采用直接在生产油管上加工分布式平口喷嘴的喷水雾化方案，经济简便；平口喷嘴可以有效缓解喷嘴阻塞的问题，还能够达到一定的雾化效果，同时大大降低的设备研制成本。Further, the nozzle 4 is a flat nozzle, and the flat nozzle 4 is composed of a stepped pipe structure on the side wall of the production tubing. It is economical and convenient to adopt the water spray atomization scheme of processing distributed flat nozzles directly on the production oil pipe; the flat nozzles can effectively alleviate the problem of nozzle clogging, and can also achieve a certain atomization effect, while greatly reducing the cost of equipment development.
进一步，如图2所示，平口喷嘴包括小径段41和大径段42，小径段41靠近生产油管的内腔设置，大径段42的进口构成喷嘴的进口，小径段41的出口构成喷嘴的出口；平口喷嘴的轴向长度尺寸与生产油管的侧壁厚度尺寸t呈相同设置。Further, as shown in Figure 2, the flat nozzle includes a small-diameter section 41 and a large-diameter section 42, the small-diameter section 41 is arranged close to the inner chamber of the production tubing, the inlet of the large-diameter section 42 constitutes the inlet of the nozzle, and the outlet of the small-diameter section 41 constitutes the outlet of the nozzle. Outlet; the axial length dimension of the flat nozzle is set to be the same as the side wall thickness dimension t of the production tubing.
小径段41的轴向长度尺寸为L，小径段41的直径为d，大径段42的直径为D，在本发明的一具体实施例中，d为3.5mm。The axial length of the small-diameter section 41 is L, the diameter of the small-diameter section 41 is d, and the diameter of the large-diameter section 42 is D. In a specific embodiment of the present invention, d is 3.5 mm.
在本实施方式中，小径段41和大径段42之间设有过渡倒角43，过渡倒角43的角度为120°。In this embodiment, a transition chamfer 43 is provided between the small diameter section 41 and the large diameter section 42, and the angle of the transition chamfer 43 is 120°.
环形水柱区域3的冷却水自大径段42的进口进入，撞击于过渡倒角43表面，冷却水通过撞击来实现更好的优化雾化效果；冷却水自大径段42进入小径段41，增加了冷却水的喷出压力。The cooling water in the annular water column area 3 enters from the entrance of the large-diameter section 42 and hits the surface of the transition chamfer 43. The cooling water achieves a better optimized atomization effect through the impact; the cooling water enters the small-diameter section 41 from the large-diameter section 42, The spray pressure of cooling water has been increased.
进一步，多个喷嘴4分组且沿生产油管的轴向间隔设置，每组喷嘴的数量为多个，各组的多个喷嘴沿生产油管的周向均匀间隔设置。喷嘴通过环形均匀分布，同时合理设置各层喷嘴之间的距离，可以覆盖相对较广的区域，又能保证能够快速降温。Further, multiple nozzles 4 are grouped and arranged at intervals along the axial direction of the production tubing, each group has multiple nozzles, and multiple nozzles of each group are evenly spaced along the circumferential direction of the production tubing. The nozzles are evenly distributed through the ring, and the distance between the nozzles of each layer is set reasonably, which can cover a relatively wide area and ensure rapid cooling.
在本发明的一具体实施例中，喷嘴4的数量为35个；7个喷嘴为一组，每组的7个喷嘴沿生产油管的周向均匀排布；相邻两组喷嘴的轴向距离为1m。In a specific embodiment of the present invention, the number of nozzles 4 is 35; 7 nozzles form a group, and the 7 nozzles of each group are evenly arranged along the circumference of the production tubing; the axial distance between two adjacent groups of nozzles 1m.
由上所述，本发明的高温地下煤气环空注水分布式喷雾冷却降温方法，适合煤炭地下气化工程应用，具有以下突出优点：From the above, the high-temperature underground gas annulus water injection distributed spray cooling cooling method of the present invention is suitable for the application of underground coal gasification engineering, and has the following outstanding advantages:
环形水柱区域的冷却水通过生产油管上的喷嘴形成雾化状态的水滴，与生产油管内腔的高温高压气体充分接触，可以在瞬间完成换热，从而对高温高压气体实现降温；The cooling water in the annular water column area forms water droplets in an atomized state through the nozzles on the production tubing, fully contacting the high-temperature and high-pressure gas in the inner cavity of the production tubing, and can complete heat exchange in an instant, thereby cooling the high-temperature and high-pressure gas;
通过合适的冷却降温方式，结合合理的喷嘴排布，使得生产井内的高温高压气体能够按照系统要求进行降温，满足系统运行要求；Through appropriate cooling methods, combined with reasonable nozzle arrangement, the high temperature and high pressure gas in the production well can be cooled according to the system requirements to meet the system operation requirements;
地面系统注水流量和喷嘴流速可根据产气量、井口产出地下煤气的温度和压力调整，地面系统实现实时动态调整和闭环智能控制；The water injection flow rate and nozzle flow rate of the ground system can be adjusted according to the gas production rate, the temperature and pressure of the underground gas produced by the wellhead, and the ground system realizes real-time dynamic adjustment and closed-loop intelligent control;
采用直接在生产油管上加工分布式平口喷嘴的喷水雾化方案，经济简便；平口喷嘴可以有效缓解喷嘴阻塞的问题，还能够达到一定的雾化效果，同时大大降低的设备研制成本；It is economical and convenient to use the water spray atomization scheme of processing distributed flat nozzles directly on the production oil pipe; the flat nozzles can effectively alleviate the problem of nozzle clogging, and can also achieve a certain atomization effect, while greatly reducing the cost of equipment development;
冷却水通过在喷嘴内的撞击实现更好的优化雾化效果；喷嘴通过环形均匀分布，同时合理设置各层喷嘴之间的距离，可以覆盖相对较广的区域，又能保证能够快速降温；The cooling water achieves a better optimized atomization effect through the impact in the nozzle; the nozzles are evenly distributed through the ring, and the distance between the nozzles of each layer is set reasonably, which can cover a relatively wide area and ensure rapid cooling;
本发明的高温地下煤气环空注水分布式喷雾冷却降温方法简单易实施，通过一层环空水管的套管即可实现高温高压气体的冷却，这为工程方案实施带来了极大的便利。以上所述仅为本发明示意性的具体实施方式，并非用以限定本发明的范围。任何本领域的技术人员，在不脱离本发明的构思和原则的前提下所作出的等同变化与修改，均应属于本发明保护的范围。The high-temperature underground gas annular water injection distributed spray cooling cooling method of the present invention is simple and easy to implement, and the cooling of high-temperature and high-pressure gas can be realized through a layer of annular water pipe casing, which brings great convenience to the implementation of engineering schemes. The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims (10)

  1. 一种高温地下煤气环空注水分布式喷雾冷却降温方法，其中，包括，将生产油管穿入环空水管内，环空水管与生产油管之间形成环形水柱区域，生产油管的内腔形成高温地下煤气生产通道；所述生产油管上设置多个喷嘴，环形水柱区域的冷却水通过所述喷嘴雾化喷射到生产油管的内腔，完成高温地下煤气的喷雾冷却降温。A high-temperature underground gas annulus water injection distributed spray cooling cooling method, which includes: inserting the production oil pipe into the annular water pipe, an annular water column area is formed between the annular water pipe and the production oil pipe, and the inner cavity of the production oil pipe forms a high-temperature underground Gas production channel; the production oil pipe is provided with multiple nozzles, and the cooling water in the annular water column area is atomized and sprayed into the inner cavity of the production oil pipe through the nozzles to complete the spray cooling of high-temperature underground gas.
  2. 如权利要求1所述的高温地下煤气环空注水分布式喷雾冷却降温方法，其中，包括以下步骤：The high-temperature underground gas annulus water injection distributed spray cooling cooling method according to claim 1, wherein, comprising the following steps:
    步骤a、将生产油管穿入环空水管内，记录地面系统初始注水流量、井口产出地下煤气初始温度和井口产出地下煤气初始压力；Step a, inserting the production oil pipe into the annular water pipe, recording the initial water injection flow rate of the ground system, the initial temperature of the underground gas produced by the wellhead, and the initial pressure of the underground gas produced by the wellhead;
    步骤b、向环形水柱区域内注水，通过喷嘴将冷却水喷射到生产油管的内腔；实时调节地面系统注水流量和喷嘴流速；Step b, injecting water into the annular water column area, spraying cooling water into the inner cavity of the production oil pipe through the nozzle; adjusting the water injection flow rate of the ground system and the nozzle flow rate in real time;
    步骤c、冷却水通过喷嘴形成雾化状态的水滴，水滴与高温地下煤气充分接触，在瞬间完成换热，实现高温地下煤气降温。Step c. The cooling water passes through the nozzle to form water droplets in an atomized state, and the water droplets fully contact with the high-temperature underground gas to complete heat exchange in an instant, thereby realizing the cooling of the high-temperature underground gas.
  3. 如权利要求2所述的高温地下煤气环空注水分布式喷雾冷却降温方法，其中，步骤b中，比较井口产出地下煤气实时动态温度与设定的井口产出地下煤气目标温度的差异，通过地面系统控制调节实时注水流量。The high-temperature underground gas annulus water injection distributed spray cooling cooling method according to claim 2, wherein, in step b, the difference between the real-time dynamic temperature of the underground gas produced by the wellhead and the set target temperature of the underground gas produced by the wellhead is compared, by Surface system controls regulate real-time injection flow.
  4. 如权利要求2所述的高温地下煤气环空注水分布式喷雾冷却降温方法，其中，喷嘴的进口位于环形水柱区域内，喷嘴的出口位于生产油管的内腔，喷嘴的进口压力大于喷嘴的出口压力，喷嘴的进口压力和喷嘴的出口压力通过地面系统调节控制。The high-temperature underground gas annular water injection distributed spray cooling cooling method according to claim 2, wherein the inlet of the nozzle is located in the annular water column area, the outlet of the nozzle is located in the inner cavity of the production oil pipe, and the inlet pressure of the nozzle is greater than the outlet pressure of the nozzle , the inlet pressure of the nozzle and the outlet pressure of the nozzle are adjusted and controlled by the ground system.
  5. 如权利要求4所述的高温地下煤气环空注水分布式喷雾冷却降温方法，其中，所述喷嘴为平口喷嘴，所述平口喷嘴由生产油管的侧壁上的阶梯管结构构成。The high-temperature underground gas annulus water injection distributed spray cooling cooling method according to claim 4, wherein the nozzle is a flat nozzle, and the flat nozzle is composed of a stepped pipe structure on the side wall of the production oil pipe.
  6. 如权利要求5所述的高温地下煤气环空注水分布式喷雾冷却降温方法，其中，所述平口喷嘴包括小径段和大径段，所述小径段靠近生产油管的内腔设置，所述平口喷嘴的轴向长度尺寸与生产油管的侧壁厚度尺寸呈相同设置。The high-temperature underground gas annulus water injection distributed spray cooling cooling method according to claim 5, wherein the flat nozzle includes a small-diameter section and a large-diameter section, the small-diameter section is arranged close to the inner cavity of the production oil pipe, and the flat-mouth nozzle The axial length dimension of the production tubing is set in the same way as the side wall thickness dimension of the production tubing.
  7. 如权利要求6所述的高温地下煤气环空注水分布式喷雾冷却降温方法，其中，所述小径段和所述大径段之间设有过渡倒角，所述过渡倒角的角度为120°。The high-temperature underground gas annulus water injection distributed spray cooling cooling method according to claim 6, wherein a transition chamfer is provided between the small-diameter section and the large-diameter section, and the angle of the transition chamfer is 120° .
  8. 如权利要求4所述的高温地下煤气环空注水分布式喷雾冷却降温方法，其中，多个所述喷嘴分组且沿生产油管的轴向间隔设置，每组喷嘴的数量为多个，各组的多个喷嘴沿生产油管的周向均匀间隔设置。The high-temperature underground gas annulus water injection distributed spray cooling cooling method according to claim 4, wherein a plurality of nozzles are grouped and arranged at intervals along the axial direction of the production tubing, and the number of nozzles in each group is multiple, and the number of nozzles in each group is A plurality of nozzles are evenly spaced along the circumference of the production tubing.
  9. 如权利要求8所述的高温地下煤气环空注水分布式喷雾冷却降温方法，其中，所 述喷嘴的数量为35个；7个喷嘴为一组，每组的7个喷嘴沿生产油管的周向均匀排布；相邻两组喷嘴的轴向距离为1m。The high-temperature underground gas annular water injection distributed spray cooling cooling method according to claim 8, wherein the number of said nozzles is 35; 7 nozzles form a group, and each group of 7 nozzles is along the circumferential direction of the production oil pipe Evenly arranged; the axial distance between two adjacent groups of nozzles is 1m.
  10. 如权利要求1所述的高温地下煤气环空注水分布式喷雾冷却降温方法，其中，所述生产油管和所述环空水管同轴设置。The high-temperature underground gas annulus water injection distributed spray cooling cooling method according to claim 1, wherein the production oil pipe and the annulus water pipe are arranged coaxially.
PCT/CN2022/137839 2021-12-27 2022-12-09 Annulus water injection distributed spray cooling method for high-temperature underground gas WO2023124897A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205990904U (en) * 2016-08-24 2017-03-01 中为(上海)能源技术有限公司 Waste heat recovery product well system for coal underground gasifying technology
CN107605454A (en) * 2017-08-28 2018-01-19 新疆国利衡清洁能源科技有限公司 Go out gas drilling hole and go out the method for gas drilling hole conveying coal gas
JP2020158549A (en) * 2019-03-25 2020-10-01 国立大学法人室蘭工業大学 Subsurface gasification method of coal
CN212317963U (en) * 2020-09-27 2021-01-08 中国矿业大学(北京) Coal gas conveying temperature control system of underground coal gasification production well
CN114198079A (en) * 2021-11-09 2022-03-18 中国石油天然气集团有限公司 High-temperature underground coal gas cooling device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205990904U (en) * 2016-08-24 2017-03-01 中为(上海)能源技术有限公司 Waste heat recovery product well system for coal underground gasifying technology
CN107605454A (en) * 2017-08-28 2018-01-19 新疆国利衡清洁能源科技有限公司 Go out gas drilling hole and go out the method for gas drilling hole conveying coal gas
JP2020158549A (en) * 2019-03-25 2020-10-01 国立大学法人室蘭工業大学 Subsurface gasification method of coal
CN212317963U (en) * 2020-09-27 2021-01-08 中国矿业大学(北京) Coal gas conveying temperature control system of underground coal gasification production well
CN114198079A (en) * 2021-11-09 2022-03-18 中国石油天然气集团有限公司 High-temperature underground coal gas cooling device

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