基于分形理論的碳酸鹽巖基質(zhì)酸化產(chǎn)能研究
發(fā)布時間：2018-10-05 14:03
【摘要】：基質(zhì)酸化作為對碳酸鹽巖儲層的一種重要增產(chǎn)措施,近年來已經(jīng)得到了廣泛的應(yīng)用。本文針對碳酸鹽巖基質(zhì)酸化的產(chǎn)能研究,在前人的工作基礎(chǔ)上,做出了較為深入的研究。重點工作如下： 大量調(diào)研了國內(nèi)外眾多專家學(xué)者對酸蝕蚓孔與分形理論的研究進展,系統(tǒng)分析了酸蝕蚓孔的影響因素,生長模型,模型優(yōu)缺點與適用范圍,客觀敘述了分形理論的起源,發(fā)展及現(xiàn)狀,確立了本文擬解決的問題：探究不同分形維數(shù)對酸化后的蚓孔地層的滲透率,表皮系數(shù)以及產(chǎn)能的影響。隨后,根據(jù)酸蝕蚓孔的形成機理與生長特征,分析了酸巖反應(yīng)原理,建立了酸蝕蚓孔生長模型。分析并討論了酸蝕蚓孔長度與半徑的變化及其影響因素�？梢钥闯龃笈帕�,低濃度以及加入了降濾劑和膠凝劑的酸液體系可以使得蚓孔生長更長,進而提高了基質(zhì)酸化的有效性。結(jié)合分形理論,建立了酸蝕蚓孔分形滲透率模型,經(jīng)過證實,可以較好地應(yīng)用于實驗條件下的酸巖反應(yīng)。分析并討論了影響蚓孔分形滲透率變化的影響因素,可以看出,迂曲度分形維數(shù)越大,滲透率越小,分形維數(shù)越大,滲透率越大；地層孔隙度越大,滲透率越大。建立了考慮蚓孔壓降的表皮系數(shù)模型,將分形維數(shù)引入到表皮模型中,對比分析了前后兩種表皮系數(shù)模型在計算結(jié)果上的不同,同時定性分析了迂曲度分形維數(shù),分形維數(shù)及地層孔隙度對表皮系數(shù)的影響。最后,根據(jù)上述一整套模型與算法,進行了對直井穩(wěn)態(tài)產(chǎn)能的計算,研究表明,酸化后蚓孔的迂曲度分形維數(shù)越大,產(chǎn)能越低,分形維數(shù)越大,產(chǎn)能越大,地層孔隙度越大,產(chǎn)能越小。 碳酸鹽巖基質(zhì)酸化是一個涉及了多門學(xué)科的復(fù)雜課題,在很多問題上還需要進行進一步的探討與分析。
[Abstract]:As an important stimulation measure for carbonate reservoir, matrix acidification has been widely used in recent years. In this paper, the productivity of carbonate matrix acidification is studied. The main work is as follows: a large number of domestic and foreign experts and scholars on the acid wormhole and fractal theory research progress, systematic analysis of the acid wormhole influence factors, growth model, model advantages and disadvantages and applicable scope, The origin, development and present situation of fractal theory are described objectively, and the problems to be solved in this paper are established: the influence of different fractal dimensions on the permeability, epidermal coefficient and productivity of acidified wormhole formation is studied. Then, according to the formation mechanism and growth characteristics of acid wormhole, the reaction principle of acid rock is analyzed, and the growth model of acid wormhole is established. The variation of the length and radius of the wormhole and its influencing factors were analyzed and discussed. It can be seen that the large discharge, low concentration and the addition of filter reducer and gelling agent can make the pore growth longer, and improve the effectiveness of substrate acidification. Based on fractal theory, a fractal permeability model of acid wormhole is established. It is proved that the model can be applied to the acid rock reaction under experimental conditions. The influence factors on the fractal permeability of wormhole are analyzed and discussed. It can be seen that the larger the fractal dimension of detour, the smaller the permeability, the larger the fractal dimension, the greater the permeability, and the greater the porosity, the greater the permeability. An epidermal coefficient model considering the pressure drop of the wormhole is established. The fractal dimension is introduced into the epidermis model. The difference between the results of the two epidermal coefficient models before and after is compared and the fractal dimension of the roundabout degree is qualitatively analyzed. The influence of fractal dimension and formation porosity on epidermal coefficient. Finally, according to the above models and algorithms, the steady-state productivity of the vertical well is calculated. The results show that the greater the fractal dimension of the wormhole after acidification, the lower the productivity, the larger the fractal dimension, the greater the productivity and the greater the porosity of the formation. The smaller the capacity. Carbonate matrix acidification is a complex subject involving many disciplines, and many problems need to be further discussed and analyzed.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE357.2
本文編號：2253677
[Abstract]:As an important stimulation measure for carbonate reservoir, matrix acidification has been widely used in recent years. In this paper, the productivity of carbonate matrix acidification is studied. The main work is as follows: a large number of domestic and foreign experts and scholars on the acid wormhole and fractal theory research progress, systematic analysis of the acid wormhole influence factors, growth model, model advantages and disadvantages and applicable scope, The origin, development and present situation of fractal theory are described objectively, and the problems to be solved in this paper are established: the influence of different fractal dimensions on the permeability, epidermal coefficient and productivity of acidified wormhole formation is studied. Then, according to the formation mechanism and growth characteristics of acid wormhole, the reaction principle of acid rock is analyzed, and the growth model of acid wormhole is established. The variation of the length and radius of the wormhole and its influencing factors were analyzed and discussed. It can be seen that the large discharge, low concentration and the addition of filter reducer and gelling agent can make the pore growth longer, and improve the effectiveness of substrate acidification. Based on fractal theory, a fractal permeability model of acid wormhole is established. It is proved that the model can be applied to the acid rock reaction under experimental conditions. The influence factors on the fractal permeability of wormhole are analyzed and discussed. It can be seen that the larger the fractal dimension of detour, the smaller the permeability, the larger the fractal dimension, the greater the permeability, and the greater the porosity, the greater the permeability. An epidermal coefficient model considering the pressure drop of the wormhole is established. The fractal dimension is introduced into the epidermis model. The difference between the results of the two epidermal coefficient models before and after is compared and the fractal dimension of the roundabout degree is qualitatively analyzed. The influence of fractal dimension and formation porosity on epidermal coefficient. Finally, according to the above models and algorithms, the steady-state productivity of the vertical well is calculated. The results show that the greater the fractal dimension of the wormhole after acidification, the lower the productivity, the larger the fractal dimension, the greater the productivity and the greater the porosity of the formation. The smaller the capacity. Carbonate matrix acidification is a complex subject involving many disciplines, and many problems need to be further discussed and analyzed.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE357.2
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