本文選題：干熱巖開(kāi)發(fā) + 增強(qiáng)型地?zé)嵯到y(tǒng)��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：化石能源枯竭、環(huán)境污染加劇是我們亟待解決的現(xiàn)實(shí)問(wèn)題。清潔無(wú)污染、可再生的地?zé)豳Y源近年來(lái)受到廣泛關(guān)注和研究。水熱型地?zé)豳Y源溫度較低、開(kāi)發(fā)深度較淺,目前利用技術(shù)成熟。干熱巖地?zé)豳Y源開(kāi)采的方法為增強(qiáng)型地?zé)嵯到y(tǒng)(Enhanced Geothermal System,EGS)。注入流體生產(chǎn)參數(shù)(流速和溫度)、人工壓裂儲(chǔ)層滲透率、注入-開(kāi)采井的井網(wǎng)分布(井?dāng)?shù)、井型、井間距等)的優(yōu)化設(shè)計(jì)是EGS實(shí)際工程建設(shè)需要解決的關(guān)鍵問(wèn)題。本文采用數(shù)值模擬方法,進(jìn)行了以下方面的工作:(1)在總結(jié)干熱巖地?zé)豳Y源賦存地質(zhì)條件基礎(chǔ)上,結(jié)合云南省騰沖縣熱海熱田地質(zhì)背景,建立了EGS采熱過(guò)程的數(shù)值模擬模型。(2)利用正交設(shè)計(jì)方法,開(kāi)展“數(shù)值模擬實(shí)驗(yàn)”,分析了井間距、注入流體溫度和流量、儲(chǔ)層滲透率等因素對(duì)EGS采熱性能的影響規(guī)律。結(jié)果表明:井間距是影響采熱性能的最主要因素,并且對(duì)注入水溫度和流量、儲(chǔ)層滲透率的確定有顯著影響。井間距較小時(shí),系統(tǒng)運(yùn)行壽命隨注入水溫度增高而增加,儲(chǔ)層的滲透率也可以較低;井間距足夠大時(shí),注入溫度的高低對(duì)系統(tǒng)運(yùn)行壽命影響不大,滲透率變化對(duì)采熱溫度也幾乎沒(méi)有影響。(3)比較了井型(直井、水平井)和井網(wǎng)分布(五點(diǎn)法、七點(diǎn)法、九點(diǎn)法)對(duì)EGS采熱性能的影響。結(jié)果表明:直井采熱系統(tǒng)中,開(kāi)采井?dāng)?shù)對(duì)水滲流的均勻性有影響,滲流不均勻?qū)?dǎo)致儲(chǔ)層熱量不能充分開(kāi)采;注入井?dāng)?shù)對(duì)水滲流面積和滲流量有影響,滲流面積小、滲流量大的系統(tǒng)運(yùn)行壽命較短;水平井采熱系統(tǒng)中,開(kāi)采井?dāng)?shù)增加時(shí)開(kāi)采出的熱水量不會(huì)變,但是會(huì)增加水的滲流面積,從而增加可采熱量;注入井?dāng)?shù)增加時(shí)開(kāi)采出的熱水量會(huì)減少,并且使區(qū)域可采熱量流失。
[Abstract]:The depletion of fossil energy and the intensification of environmental pollution are the practical problems to be solved urgently. Clean and non-polluting, renewable geothermal resources have received extensive attention and research in recent years. Hydrothermal geothermal resources have low temperature and shallow exploitation depth. The method of exploitation of dry hot rock geothermal resources is enhanced Geothermal system (EGS). The optimization design of injection fluid production parameters (velocity and temperature), artificial fracturing reservoir permeability, well pattern distribution (number of wells, well types, well spacing, etc.) are the key problems to be solved in EGS construction. In this paper, numerical simulation method is used to carry out the following work: (1) on the basis of summing up the geological conditions of geothermal resources in dry hot rock, combined with the geological background of hot sea thermal field in Tengchong County, Yunnan Province, The numerical simulation model of EGS heat recovery process is established. (2) by using orthogonal design method, numerical simulation experiments are carried out, and the effects of well spacing, injection fluid temperature and flow rate, reservoir permeability and other factors on the heat recovery performance of EGS are analyzed. The results show that well spacing is the most important factor affecting thermal recovery performance, and it has a significant effect on the determination of injection water temperature and flow rate and reservoir permeability. When the interval between wells is small, the operating life of the system increases with the increase of injection water temperature, and the permeability of reservoir can also be lower, and when the interval between wells is large enough, the level of injection temperature has little effect on the operating life of the system. (3) the effects of well pattern (vertical well, horizontal well) and well pattern distribution (five point method, seven point method, nine point method) on heat recovery performance of EGS are compared. The results show that in the heat recovery system of vertical wells, the number of wells produced has an effect on the uniformity of water seepage, and the uneven seepage will lead to insufficient exploitation of reservoir heat, while the number of injection wells has an effect on the area and flow rate of water percolation, and the seepage area is small. In the heat recovery system of horizontal wells, the quantity of hot water produced will not change when the number of wells is increased, but the seepage area of water will be increased, thus the recoverable heat will be increased. As the number of injection wells increases, the amount of hot water produced will decrease and the recoverable heat will be lost.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P314

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