WO2023124897A1 - Procédé de refroidissement par pulvérisation distribuée par injection d'eau de conduite annulaire pour gaz souterrain à haute température - Google Patents

Procédé de refroidissement par pulvérisation distribuée par injection d'eau de conduite annulaire pour gaz souterrain à haute température Download PDF

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Publication number
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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WIPO (PCT)
Prior art keywords
underground gas
temperature
nozzle
cooling
nozzles
Prior art date
Application number
PCT/CN2022/137839
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English (en)
Chinese (zh)
Inventor
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
Original Assignee
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
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.)
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Application filed by 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 filed Critical 中国石油天然气集团有限公司
Publication of WO2023124897A1 publication Critical patent/WO2023124897A1/fr

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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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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention concerne un procédé de refroidissement par pulvérisation distribuée par injection d'eau de conduite annulaire pour gaz souterrain à haute température, le procédé consistant à : insérer un tube de production (1) dans une conduite d'eau annulaire (2) pour former une zone de colonne d'eau annulaire (3) entre la conduite d'eau annulaire (2) et le tube de production (1), et pour former un canal de production de gaz souterrain à haute température dans une cavité interne du tube de production (1) ; et agencer une pluralité de buses (4) sur le tube de production (1), et atomiser et pulvériser de l'eau de refroidissement de la zone de colonne d'eau annulaire (3) dans la cavité interne du tube de production (1) par les buses (4) afin d'achever le refroidissement par pulvérisation du gaz souterrain à haute température. L'eau de refroidissement dans la zone de colonne d'eau annulaire (3) forme des gouttelettes dans un état atomisé au moyen des buses (4) sur le tube de production (1), et crée un contact complet avec un gaz à haute température et à haute pression dans la cavité interne du tube de production (1) de sorte qu'un échange de chaleur peut être achevé instantanément afin de refroidir le gaz à haute température et à haute pression.
PCT/CN2022/137839 2021-12-27 2022-12-09 Procédé de refroidissement par pulvérisation distribuée par injection d'eau de conduite annulaire pour gaz souterrain à haute température WO2023124897A1 (fr)

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CN202111609819.4 2021-12-27
CN202111609819.4A CN116357286A (zh) 2021-12-27 2021-12-27 高温地下煤气环空注水分布式喷雾冷却降温方法

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205990904U (zh) * 2016-08-24 2017-03-01 中为(上海)能源技术有限公司 用于煤炭地下气化工艺的余热回收产品井系统
CN107605454A (zh) * 2017-08-28 2018-01-19 新疆国利衡清洁能源科技有限公司 出气钻孔及出气钻孔输送煤气的方法
JP2020158549A (ja) * 2019-03-25 2020-10-01 国立大学法人室蘭工業大学 石炭の地下ガス化方法
CN212317963U (zh) * 2020-09-27 2021-01-08 中国矿业大学(北京) 一种煤炭地下气化生产井煤气输送温度控制系统
CN114198079A (zh) * 2021-11-09 2022-03-18 中国石油天然气集团有限公司 一种高温地下煤气降温装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205990904U (zh) * 2016-08-24 2017-03-01 中为(上海)能源技术有限公司 用于煤炭地下气化工艺的余热回收产品井系统
CN107605454A (zh) * 2017-08-28 2018-01-19 新疆国利衡清洁能源科技有限公司 出气钻孔及出气钻孔输送煤气的方法
JP2020158549A (ja) * 2019-03-25 2020-10-01 国立大学法人室蘭工業大学 石炭の地下ガス化方法
CN212317963U (zh) * 2020-09-27 2021-01-08 中国矿业大学(北京) 一种煤炭地下气化生产井煤气输送温度控制系统
CN114198079A (zh) * 2021-11-09 2022-03-18 中国石油天然气集团有限公司 一种高温地下煤气降温装置

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