本文選題：大佛寺井田　切入點(diǎn)：低階煤　出處：《西安科技大學(xué)》2017年碩士論文

【摘要】：彬長礦區(qū)地處鄂爾多斯盆地南部渭北隆起北緣,為典型侏羅紀(jì)低階煤開采區(qū)。選取區(qū)內(nèi)大佛寺井田4#煤儲(chǔ)層為研究對(duì)象,基于煤層氣地質(zhì)學(xué)、界面物理化學(xué)、表面活性劑化學(xué)等基礎(chǔ)理論知識(shí),主要采用大樣量煤層氣吸附/解吸實(shí)驗(yàn)測試和吸附勢預(yù)測理論分析相結(jié)合的方法,通過熱力學(xué)定量計(jì)算與定性分析,從煤儲(chǔ)層微觀角度研究煤、水、甲烷共存下的固-液-氣三相耦合體系,探究相間作用關(guān)系,最終揭示煤-水-甲烷作用模式。論文主要獲得以下成果和認(rèn)識(shí):(1)基于Polanyi吸附勢理論,以儲(chǔ)層溫度下的實(shí)測數(shù)據(jù)為依據(jù),建立了考慮“逸度”影響在內(nèi)的修正的溫-壓綜合吸附預(yù)測模型。進(jìn)而預(yù)測了不同類型煤樣(空干基煤樣、平衡水煤樣、不同潤濕煤樣)在不同溫壓下的等溫吸附/解吸參數(shù),發(fā)現(xiàn)實(shí)驗(yàn)條件(溫壓受限)和極限條件(理想溫壓)下的吸附量和吸附熱變化規(guī)律不同,可能是溫度、壓力和潤濕劑綜合影響下的水分-甲烷作用過程差異所導(dǎo)致。(2)較高的水分、灰分含量,高氧含量以及高惰質(zhì)組、低鏡質(zhì)組含量,豐富的含氧官能團(tuán)種類和發(fā)育的孔、裂隙是使大佛寺低階煤煤體親水良好的內(nèi)在原因。外因方面,不同類型表面活性劑性質(zhì)對(duì)潤濕性影響不同,潤濕性由強(qiáng)到弱依次為:正潤濕劑、蒸餾水、排采水、負(fù)潤濕劑。(3)“水分”對(duì)甲烷存在置換作用和解吸作用兩方面影響。溫度、壓力和潤濕劑綜合影響置換解吸效果,置換作用方面,升壓促進(jìn)置換效應(yīng),升溫則抑制,平衡水樣與正潤濕樣產(chǎn)生甲烷置換正效應(yīng),負(fù)潤濕樣產(chǎn)生置換負(fù)效應(yīng)。解吸作用方面,在相對(duì)低壓段,單位壓降更利于甲烷解吸,升壓解吸參數(shù)減小,低壓解吸滯后率大,高壓則趨于平緩;升溫解吸參數(shù)增大,高溫解吸滯后則減弱。(4)表面自由能和潤濕熱的計(jì)算證實(shí)液態(tài)水潤濕(加活性劑處理)放出熱量可有效促進(jìn)吸附態(tài)甲烷解吸。(5)煤基質(zhì)中氣態(tài)水的形成與孔隙結(jié)構(gòu)有關(guān),水分運(yùn)移主要以液態(tài)水潤濕和氣態(tài)水?dāng)U散(蒸發(fā))兩種形式,氣態(tài)水對(duì)吸附態(tài)甲烷形成置換解吸,液態(tài)水一定程度上可能利于甲烷的吸附。大佛寺低階煤煤層氣解吸實(shí)質(zhì)是壓降傳遞(能量作用)和汽化水蒸氣(置換效應(yīng))共同作用的結(jié)果。
[Abstract]:Binchang mining area is located in the north edge of Weibei uplift in the south of Ordos Basin, which is a typical Jurassic low rank coal mining area.Taking the coal reservoir of Dafosi mine field as the research object, based on the basic theoretical knowledge of coal bed methane geology, interface physical chemistry, surfactant chemistry and so on,By combining the experimental test of adsorption / desorption of large amount of coal bed methane with the theoretical analysis of adsorption potential prediction, through thermodynamic quantitative calculation and qualitative analysis, coal and water are studied from the microscopic point of view of coal reservoir.The solid-liquid-gas three-phase coupling system under the coexistence of methane is used to explore the interaction relationship between phases and finally reveal the mode of coal-water-methane interaction.Based on the theory of Polanyi adsorption potential and the measured data of reservoir temperature, a modified prediction model of temperature pressure comprehensive adsorption considering the influence of fugacity is established in this paper.Furthermore, the isothermal adsorption / desorption parameters of different types of coal samples (dry coal samples, equilibrium water coal samples, different wetting coal samples) at different temperatures and pressures were predicted.It is found that the variation of adsorption capacity and adsorption heat is different between the experimental conditions (temperature and pressure limitation) and the limit condition (ideal temperature and pressure), which may be temperature.Under the combined influence of pressure and wetting agent, the difference of water-methane interaction process resulted in higher moisture, ash content, high oxygen content, high inertinite group, low vitrinite content, abundant oxygen-containing functional groups and developing pores.Fissures are the internal reasons for the hydrophilicity of low rank coal in Dafosi.In terms of external factors, the properties of different types of surfactants have different effects on wettability. The order of wettability from strong to weak is: positive wetting agent, distilled water, drain water,Negative wetting agent. 3) "moisture" has two effects on methane displacement and desorption.Temperature, pressure and wetting agent comprehensively affect the displacement desorption effect. In the displacement effect, the pressure boosts the displacement effect, the temperature rise is restrained, the balance water sample and the positive wetting sample produce the methane displacement positive effect, the negative wetting sample produces the displacement negative effect.In terms of desorption, the unit pressure drop is more favorable for methane desorption in the relative low pressure section, and the pressure boost desorption parameter decreases, the low pressure desorption hysteresis rate is large, the high pressure desorption hysteresis rate tends to be gentle, and the temperature rise desorption parameter increases.The calculation of surface free energy and moist heat of high temperature desorption hysteresis shows that the heat released by liquid water wetting (plus active agent treatment) can effectively promote the formation of gaseous water in adsorbed methane desorption. 5) the formation of gaseous water in coal matrix is related to pore structure.Water migration is mainly in the form of liquid water wetting and gaseous water diffusion (evaporation). Gaseous water forms displacement desorption of adsorbed methane, and liquid water may be beneficial to methane adsorption to some extent.The desorption of low rank coal bed methane in Dafosi is the result of both pressure drop transfer (energy effect) and vaporized water vapor (displacement effect).
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD712;P618.11

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