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  本文關(guān)鍵詞： 酸化壓裂 酸液濾失 酸蝕蚓孔 裂縫網(wǎng)絡(luò) 超臨界CO_2　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：碳酸鹽巖儲層酸壓過程中,酸液溶蝕擴展較大的孔隙或天然裂縫形成結(jié)構(gòu)復(fù)雜的酸蝕孔縫,導(dǎo)致酸液大量濾失,嚴重制約了酸壓主裂縫的穿透距離。同時酸巖反應(yīng)生成的CO2等產(chǎn)物使酸液濾失情況更加復(fù)雜,因此有必要進一步研究酸液濾失機理,這對于提高酸壓效果具有重要意義。 本文依托國家科技重大專項任務(wù),首先針對孔隙型碳酸鹽巖酸壓形成酸蝕蚓孔的情況,建立了酸蝕蚓孔濾失計算模型,對酸壓過程中蚓孔內(nèi)酸液流動反應(yīng)、蚓孔的溶蝕擴展及游離態(tài)CO2效應(yīng)對蚓孔酸液濾失的影響進行了模擬分析。針對裂縫型碳酸鹽巖儲層酸壓形成酸蝕裂縫的情況,進行了天然裂縫網(wǎng)絡(luò)酸液溶蝕實驗,測試了酸蝕主裂縫溝通分支裂縫的能力及酸液濾失情況�；趩瘟芽p碳酸鹽巖儲層酸化的物理模型,根據(jù)裂縫內(nèi)酸液質(zhì)量守恒及酸液傳質(zhì)平衡建立了天然裂縫內(nèi)酸液流動反應(yīng)模型,并對酸壓過程中天然裂縫的溶蝕擴展及酸液濾失進行了模擬分析�；谟邢拊碚�,利用等效滲透率方法,以裂縫基質(zhì)雙重介質(zhì)物理模型為基礎(chǔ),建立了天然裂縫網(wǎng)絡(luò)等效連續(xù)介質(zhì)濾失模型,模擬分析了天然裂縫網(wǎng)絡(luò)形態(tài)對工作液濾失的影響。 在考慮裂縫動態(tài)延伸、縫內(nèi)溫度分布、酸巖反應(yīng)及縫內(nèi)游離態(tài)CO2壓縮性影響的基礎(chǔ)上,建立了碳酸鹽巖儲層酸液濾失計算模型,模擬分析了酸蝕孔縫、游離態(tài)CO2效應(yīng)及不同施工條件對酸液濾失及酸壓效果的影響。研究表明,游離態(tài)CO2的存在降低了酸液濾失量,同時酸液濾失量與施工參數(shù)及儲層物性有密切的關(guān)系,可通過優(yōu)化相關(guān)施工參數(shù)降低酸液濾失以提高酸壓效果。 論文是在考慮游離態(tài)CO2、酸蝕孔縫擴展的基礎(chǔ)上建立的濾失計算模型具有一定新意,研究成果對現(xiàn)場控濾失、提高酸壓效果具有重要的指導(dǎo)作用。
[Abstract]:In the process of acid fracturing in carbonate reservoir, the acid solution corrodes and expands the pore or the natural fracture forms the complex structure of the acid corrosion pore fracture, which results in a large amount of acid fluid filtration. At the same time, the CO2 produced by acid rock reaction makes the acid fluid filtration more complex, so it is necessary to further study the mechanism of acid fluid filtration. It is of great significance to improve the effect of acid compression. In this paper, based on the important special task of national science and technology, firstly, in view of the formation of acid wormhole in porous carbonate rock, a calculation model of acid wormhole filtration is established. The effects of solution propagation of wormhole and free CO2 effect on acid fluid filtration of wormhole were simulated and analyzed. The acid corrosion fracture was formed by acid fracturing in fractured carbonate reservoir. The experiments of acid solution dissolution in natural fracture network were carried out, and the ability of acid corrosion main fracture to communicate branch fracture and acid fluid filtration were tested. Based on the physical model of acidification of carbonate reservoir with single fracture. According to the quality conservation and mass transfer equilibrium of acid solution in fracture, the model of acid fluid flow reaction in natural fracture is established. Based on the finite element theory and the equivalent permeability method, the physical model of dual medium of fracture matrix is used to simulate and analyze the corrosion propagation and acid filtration of natural cracks in the process of acid fracturing. The equivalent continuous medium filtration model of natural fracture network is established, and the influence of natural fracture network shape on working fluid filtration is simulated and analyzed. On the basis of considering the influence of fracture dynamic extension, temperature distribution, acid rock reaction and free CO2 compressibility in carbonate reservoir, a calculation model of acid fluid filtration in carbonate reservoir is established, and the acid-etching pore fracture is simulated and analyzed. The effect of free CO2 and the effect of different construction conditions on acid filtration and acid fracturing. The study shows that the existence of free CO2 reduces the amount of acid fluid filtration. At the same time, the acid filtrate loss is closely related to the construction parameters and reservoir physical properties, which can be reduced by optimizing the construction parameters to improve the acid fracturing effect. In this paper, the filtration calculation model based on free CO _ 2 and acid-etching hole expansion has some new ideas, and the research results have important guiding function for controlling filtration in situ and improving the acid-fracturing effect.
【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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