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  本文選題：有效應(yīng)力　切入點：滲透率有效應(yīng)力系數(shù)　出處：《西南石油大學》2015年碩士論文

【摘要】：在低滲透氣藏開采過程中,由于微裂縫和孔隙形變的共同作用,導致有效應(yīng)力表現(xiàn)出明顯的非線性,經(jīng)典的線性有效應(yīng)力理論難以客觀反映低滲氣藏開發(fā)過程中滲透率隨孔隙壓力的變化規(guī)律,因此難以客觀評價應(yīng)力敏感性對低滲透氣藏開發(fā)造成的影響。為此,本文通過對國內(nèi)外有效應(yīng)力理論與實驗研究的調(diào)研,以低滲砂巖為研究對象開展?jié)B透率有效應(yīng)力和應(yīng)力敏感性研究,并結(jié)合數(shù)值模擬分析低滲透氣藏中應(yīng)力敏感對開發(fā)的影響。主要完成的工作和取得的認識如下： (1)完成低滲砂巖的基本物性測試,并采用掃描電鏡、鑄體薄片和壓汞實驗等微觀分析手段對部分巖樣進行了微觀特征分析； (2)根據(jù)滲透率有效應(yīng)力定義和數(shù)據(jù)分析方法,提出獲取滲透率有效應(yīng)力系數(shù)的方法； (3)設(shè)計滲透率有效應(yīng)力的實驗方案并完成10塊低滲砂巖的常規(guī)應(yīng)力敏感性實驗和滲透率有效應(yīng)力實驗； (4)結(jié)合滲透率有效應(yīng)力實驗數(shù)據(jù)計算實驗巖心的滲透率有效應(yīng)力系數(shù),并分析滲透率有效應(yīng)力系數(shù)隨孔隙壓力和圍壓的變化規(guī)律； (5)分析滲透率有效應(yīng)力系數(shù)隨Terzaghi有效應(yīng)力的變化規(guī)律,并得到滲透率有效應(yīng)力系數(shù)與Terzaghi有效應(yīng)力的函數(shù)關(guān)系式； (6)對實驗巖心的滲透率與有效應(yīng)力關(guān)系進行分析,建立滲透率與有效應(yīng)力的函數(shù)關(guān)系式并分析不同類型函數(shù)關(guān)系式的適用性； (7)基于不同有效應(yīng)力理論和巖石應(yīng)力敏感性評價方法,對實驗巖心的應(yīng)力敏感性進行評價； (8)采用數(shù)值模擬器分析應(yīng)力敏感對開發(fā)的影響,并結(jié)合實例對壓裂水平井產(chǎn)能進行評價。 本次研究結(jié)合有效應(yīng)力的定義和數(shù)據(jù)分析方法,建立了一套獲取滲透率有效應(yīng)力系數(shù)的方法。通過對滲透率有效應(yīng)力的研究進一步深化對滲透率有效應(yīng)力變化規(guī)律的認識并客觀分析應(yīng)力敏感性對低滲透氣藏開發(fā)的影響,為準確評價儲層巖石的應(yīng)力敏感性以及合理高效地開發(fā)油氣田提供科學依據(jù)。
[Abstract]:In the process of producing low permeability gas reservoirs, due to the joint action of microfractures and pore deformation, the effective stress shows obvious nonlinearity.The classical linear effective stress theory can not objectively reflect the variation of permeability with pore pressure during the development of low permeability gas reservoirs, so it is difficult to evaluate objectively the influence of stress sensitivity on the development of low permeability gas reservoirs.Therefore, through the investigation of effective stress theory and experiment at home and abroad, the research on permeability effective stress and stress sensitivity of low permeability sandstone is carried out in this paper.The influence of stress sensitivity on development in low permeability gas reservoir is analyzed by numerical simulation.The main tasks accomplished and the awareness gained are as follows:1) the basic physical properties of low permeability sandstone were tested, and some rock samples were analyzed by means of scanning electron microscope, casting sheet and mercury injection experiment.2) according to the definition of effective stress of permeability and the method of data analysis, the method of obtaining effective stress coefficient of permeability is put forward.(3) designing the experimental scheme of permeability effective stress and completing the conventional stress sensitivity experiment and permeability effective stress experiment of 10 low permeability sandstone;(4) combining the experimental data of permeability effective stress, the permeability effective stress coefficient of experimental core is calculated, and the variation law of permeability effective stress coefficient with pore pressure and confining pressure is analyzed.(5) the variation of permeability effective stress coefficient with Terzaghi effective stress is analyzed, and the functional relationship between permeability effective stress coefficient and Terzaghi effective stress is obtained.(6) the relationship between permeability and effective stress of experimental core is analyzed, the functional expression of permeability and effective stress is established and the applicability of different types of functional relationship is analyzed.Based on different effective stress theory and rock stress sensitivity evaluation method, the stress sensitivity of experimental core is evaluated.The influence of stress sensitivity on development is analyzed by numerical simulator, and the productivity of fractured horizontal well is evaluated with practical examples.Based on the definition of effective stress and the method of data analysis, a set of methods for obtaining effective stress coefficient of permeability is established.Through the study of effective stress of permeability, the influence of stress sensitivity on the development of low permeability gas reservoir is analyzed objectively.It provides a scientific basis for evaluating the stress sensitivity of reservoir rocks and developing oil and gas fields reasonably and efficiently.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE312

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本文編號：1712022