本文選題：煤層 + 水力壓裂��； 參考：《西南石油大學》2017年碩士論文

【摘要】：我國煤層氣資源非常豐富,處于世界第三,具有重大開發(fā)價值和巨大開采潛力。但是,近年來國內(nèi)煤層氣開發(fā)效果遠低于預期,主要表現(xiàn)為煤層氣單井產(chǎn)量較低、壓裂增產(chǎn)效果較差。因此,煤層可壓性問題日益凸顯,是煤層氣開發(fā)利用亟需解決的重大問題。本論文研究煤層可壓性問題,在分析并優(yōu)選煤層可壓性影響因素的基礎上,研究表征煤層可壓性的定量化指標并利用該指標形成煤層可壓性的評價方法。經(jīng)過碩士期間的研究工作,本論文獲得以下成果:(1)通過對煤層可壓性的影響因素進行廣泛調(diào)研和深入分析,明確并優(yōu)選了泥質(zhì)含量、抗張強度、灰分含量、煤巖類型和水分含量作為影響煤層可壓性的主控因素。(2)針對煤層氣排采規(guī)律及生產(chǎn)特點,分析和對比了煤層氣井產(chǎn)能的不同表示方法,確定了穩(wěn)定產(chǎn)氣量與井底流壓的乘積來表征煤層氣井壓后產(chǎn)能的方法。(3)利用規(guī)劃思想以及最小二乘原理,建立了確定參數(shù)組合權重的模型,綜合主觀賦權法的層次分析1-9標度法以及指標標度法和客觀賦權法中的灰色關聯(lián)度法以及熵權法確定的單一權重形成組合權重,進而確定了可壓性指標。(4)基于灰色歐幾里德關聯(lián)度模型,對煤層可壓性指標進行量化,依此進行了煤層可壓性評價。同時基于可壓性指標,以非對稱貼近度代替最大隸屬度準則,形成了改進的物元可拓模型,對煤層可壓性進行了補充評價,降低了可壓性評價中存在的模糊性。(5)將基于灰色歐幾里德關聯(lián)度模型形成的可壓性評價方法與基于非對稱貼近度物元可拓模型形成的評價方法結合,對HC井區(qū)煤層進行可壓性評價,應用情況表明:評價正確率高,能夠滿足工程實際。
[Abstract]:China is rich in CBM resources and ranks third in the world, which has great development value and great mining potential. However, in recent years, the development effect of coalbed methane in China is far lower than expected, which mainly shows that the production of single well is low and the effect of fracturing is poor. Therefore, the problem of coal seam compressibility is becoming more and more prominent, which is an important problem to be solved in the development and utilization of coalbed methane. In this paper, the problem of coal seam compressibility is studied. On the basis of analyzing and selecting the influencing factors of coal seam compressibility, the quantitative index of coal seam compressibility is studied and the evaluation method of coal seam compressibility is formed by using this index. Through the research work during the master's period, this paper has obtained the following results: 1. Through extensive investigation and in-depth analysis of the influencing factors of coal seam compressibility, it is clear and excellent to select the muddy content, tensile strength, ash content. Coal rock type and moisture content are the main controlling factors affecting coal seam compressibility. (2) according to the coal bed methane discharge and production characteristics, the different expression methods of coalbed methane well productivity are analyzed and compared. The method of determining the product of stable gas production and bottom-hole flow pressure to characterize the productivity of coalbed gas wells after pressure is established. The model of determining the weight of parameters combination is established by using the planning idea and the principle of least squares. Combining the hierarchical analysis of subjective weighting method 1-9 scale method, index scale method and objective weighting method, grey relational degree method and entropy weight method determine the single weight to form the combined weight. Based on the grey Euclidean correlation model, the index of coal seam compressibility is quantified, and the coal seam compressibility is evaluated accordingly. At the same time, based on the compressibility index, an improved matter-element extension model is formed by replacing the maximum membership criterion with asymmetric closeness, and the compressibility of coal seam is appraised. The fuzziness in the evaluation of compressibility is reduced.) the evaluation method of compressibility based on grey Euclidean correlation degree model is combined with the evaluation method based on the matter-element extension model of asymmetric closeness. The compressibility evaluation of coal seam in HC well area shows that the evaluation accuracy is high and can satisfy the engineering practice.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TE37

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