本文選題：弱膠結(jié)砂巖　切入點(diǎn)：出砂　出處：《武漢輕工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：弱膠結(jié)砂巖是我國油藏的主力儲油層,開采過程中普遍存在出砂現(xiàn)象,大量出砂常常會造成砂埋油層或井筒砂堵等工程災(zāi)害;但另一方面,適量的出砂可以增強(qiáng)儲層的滲透性,進(jìn)而提高采出率。因此,深入研究弱膠結(jié)砂巖油藏的出砂機(jī)理,合理的控制出砂既有利于石油開采過程中的災(zāi)害防治,也有利于提高采收率。本文以弱膠結(jié)砂巖為研究對象,首先采用圖像處理的方法研究了其細(xì)觀孔隙結(jié)構(gòu)特征,然后采用理論和實驗相結(jié)合的方法建立其統(tǒng)計損傷本構(gòu)模型,最后采用數(shù)值模擬的方法研究了砂巖損傷導(dǎo)致出砂的動態(tài)過程。主要研究工作如下:(1)選取典型弱膠結(jié)砂巖試樣進(jìn)行CT掃描實驗,獲取其細(xì)觀結(jié)構(gòu)圖像;基于MATLAB圖像處理工具箱對細(xì)觀結(jié)構(gòu)圖像進(jìn)行處理,分離出砂巖的孔隙結(jié)構(gòu);對分離出的孔隙結(jié)構(gòu)進(jìn)行分析,獲取其統(tǒng)計學(xué)參數(shù);進(jìn)而基于Monte-Carlo隨機(jī)模擬技術(shù)研究了孔隙結(jié)構(gòu)的重建方法。(2)考慮弱膠結(jié)砂巖內(nèi)膠結(jié)物和基質(zhì)顆粒在力學(xué)性質(zhì)上的非均質(zhì)性,假定砂巖內(nèi)微元的強(qiáng)度服從Weibull分布,基于Drucker-Prager模型建立了弱膠結(jié)砂巖的統(tǒng)計損傷本構(gòu)模型,推導(dǎo)了模型的表達(dá)式和Weibull分布參數(shù)m和F0的計算方法;結(jié)合砂巖單軸實驗,驗證了理論全程應(yīng)力-應(yīng)變曲線和實驗曲線的一致性,檢驗了所建立的統(tǒng)計損傷本構(gòu)模型的有效性。(3)基于統(tǒng)計砂巖細(xì)觀模型建模方法,生成具有不同孔隙率的砂巖模型,結(jié)合ABAQUS穩(wěn)態(tài)滲流功能,分析孔隙率對砂巖滲透系數(shù)的影響規(guī)律。(4)基于通用有限元軟件ABAQUS的材料本構(gòu)模型接口UMAT,編程實現(xiàn)了所建立的損傷本構(gòu)模型;在ABAQUS平臺上,基于所建的統(tǒng)計本構(gòu)模型,結(jié)合所建立的損傷本構(gòu)模型,采用數(shù)值模擬方法研究了砂巖在單軸受壓作用下砂巖的微裂紋起裂及其擴(kuò)展的動態(tài)過程。
[Abstract]:Weak cemented sandstone is the main reservoir in our country. Sand production is common in the process of production. A large amount of sand production often results in engineering disasters such as sand buried oil layer or wellbore sand plugging, but on the other hand, proper sand production can enhance the permeability of reservoir. Therefore, further study on sand production mechanism of weakly cemented sandstone reservoir and reasonable control of sand production are not only beneficial to disaster prevention during oil production, but also to oil recovery. This paper takes weak cemented sandstone as the research object. Firstly, the characteristics of meso-pore structure were studied by image processing, and then the statistical damage constitutive model was established by combining theory with experiment. Finally, the dynamic process of sand production caused by sandstone damage is studied by numerical simulation. The main research work is as follows: 1) the typical samples of weakly cemented sandstone are selected for CT scanning experiment, and the meso-structure images are obtained. Based on MATLAB image processing toolbox, the pore structure of sandstone is separated, the pore structure is analyzed and its statistical parameters are obtained. Furthermore, based on the Monte-Carlo stochastic simulation technique, the reconstruction method of pore structure is studied. (2) considering the heterogeneity of mechanical properties of cemented and matrix particles in weakly cemented sandstone, it is assumed that the strength of microelements in sandstone is distributed from Weibull. Based on the Drucker-Prager model, the statistical damage constitutive model of weakly cemented sandstone is established, the expression of the model and the calculation method of Weibull distribution parameters m and F0 are derived. The consistency of the stress-strain curve and the experimental curve is verified. The validity of the established statistical damage constitutive model is tested. Based on the statistical sandstone meso-model modeling method, the sandstone model with different porosity is generated. Combined with the steady flow function of ABAQUS, the influence of porosity on sandstone permeability is analyzed. (4) based on the interface of material constitutive model of general finite element software ABAQUS, the damage constitutive model is programmed and realized on ABAQUS platform. Based on the statistical constitutive model and the damage constitutive model, the dynamic process of micro-crack initiation and propagation of sandstone under uniaxial compression is studied by numerical simulation.
【學(xué)位授予單位】：武漢輕工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE311

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