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不同油田废弃井型转地热开发规律与参数

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为解决传统地下热水直接利用方式存在的潜在地质灾害和环境污染等问题,提出了一种"取热不取水"的、以同轴套管换热系统为关键系统的新型地热开发方式,建立了直井与多分支井同轴套管闭式换热系统数值模型,对比分析取热效果并开展了参数敏感性分析.结果表明:相同条件下,多分支井系统较直井系统具有更高的出口温度和取热功率,但导致注入压力显著上升.两种井型对于各参数的响应基本一致,仅程度不同,其中注入温度、流量、保温管长度、地层和水泥导热系数会显著影响系统的取热效果.该结果对深层地热开采的井型选择具有指导意义.
The Development Laws and Parameters of Geothermal Extraction from Different Abandoned Well Types in Oil Fields
To address the potential geological hazards and environmental pollution associated with traditional direct utilization methods of geothermal water,a new geothermal development approach,emphasizing"taking heat without water"and utilizing a coaxial casing heat exchange system as the core component,is proposed.Numerical models of the coaxial casing closed-loop heat transfer system are established for both straight wells and multi-branch wells,comparing heat extraction efficiency and conducting a sensitivity analysis of the parameters involved.The results demonstrate that the multi-branch well system achieves higher outlet temperatures and heat extraction power than the straight well system under identical conditions;however,this also leads to a significant increase in injection pressure.The different well types show similar responses to varying parameters,with differences primarily in degree.Factors that significantly influence the system's heat extraction efficiency include the injection temperature,flow rate,length of the insulation pipe,and thermal conductivity of the formation and cement.The study provides valua-ble guidance on selecting well types for deep geothermal extraction.

geothermal energycoaxial heat exchangermulti-branch wellnumerical simulation

石宇、彭俊岚、孙文超、张宏源、刘斌、李冰

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西南交通大学地球科学与工程学院,成都 611756

中国石油集团工程技术研究院有限公司,北京 102206

地热能 同轴套管换热器 多分支井 数值模拟

国家自然科学基金面上项目中国石油天然气集团有限公司科学研究与技术开发项目中深层地热井换热技术研究开发项目&&西南交通大学新型交叉学科培育基金项目西南交通大学新型交叉学科培育基金项目

523740102020A-4811JT2021DJ5502JT2682023ZTPY0302682022KJ034

2024

10.6054/j.jscnun.2024047

华南师范大学学报(自然科学版)
华南师范大学

华南师范大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.413
ISSN：1000-5463
年,卷(期)：2024.56(4)
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