本文關(guān)鍵詞：考慮酸蝕蚓孔的碳酸鹽巖基質(zhì)酸化產(chǎn)能研究　出處：《西南石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 碳酸鹽巖油藏 基質(zhì)酸化 酸蝕蚓孔 產(chǎn)能

【摘要】：基質(zhì)酸化是碳酸鹽巖油藏的開發(fā)過程中重要的改造和增產(chǎn)手段之一�；|(zhì)酸化主要通過在適當(dāng)排量條件下向儲層注入活性酸,利用酸液的對流、擴散以及酸巖反應(yīng)等作用在近井帶形成高滲透性的蚓孔,溝通原始地層區(qū)域,降低近井帶的表皮系數(shù),實現(xiàn)增產(chǎn)。在基質(zhì)酸化中,前期污染的準確預(yù)測、蚓孔的擴展模擬以及蚓孔存在條件下的產(chǎn)能計算是碳酸鹽巖油藏基質(zhì)酸化增產(chǎn)機理研究和效果評價中的重要問題。根據(jù)當(dāng)前研究現(xiàn)狀,油井污染預(yù)測大多基于油水兩相流方程進行模擬計算;蚓孔擴展模型中,較為成熟的是雙尺度模型。但是,對于蚓孔存在的酸化區(qū)域產(chǎn)能計算大多國內(nèi)外學(xué)者利用平均滲透率進行簡化處理,從而推導(dǎo)解析解進行產(chǎn)能計算,該方法忽略了地層的非均質(zhì)性和蚓孔的非規(guī)則生長。因此,建立更加準確的考慮酸蝕蚓孔的產(chǎn)能計算模型對完善基質(zhì)酸化增產(chǎn)機理研究顯得尤為重要。本文以碳酸鹽巖基質(zhì)酸化酸蝕蚓孔擴展規(guī)律及其產(chǎn)能計算為研究對象,運用石油工程、油藏數(shù)值模擬等領(lǐng)域的相關(guān)知識進行了儲層污染深度計算、蚓孔擴展規(guī)律模擬以及考慮酸蝕蚓孔的產(chǎn)能計算,取得了以下成果:(1)建立了二維徑向條件下的泥漿污染深度預(yù)測及傷害滲透率計算模型,為后期蚓孔擴展模擬提供數(shù)據(jù);(2)利用無因次蚓孔雙尺度生長模型,模擬分析了不同相位角及射孔位置條件下的蚓孔擴展規(guī)律;同時,建立了考慮酸蝕蚓孔的產(chǎn)能數(shù)值計算新方法,將蚓孔擴展模型與油水兩相流模型進行聯(lián)立數(shù)值求解進行產(chǎn)能計算;(3)通過本文產(chǎn)能計算新方法,分析了蚓孔長度、蚓孔密度、完井方式等因素對直井酸化產(chǎn)能的影響,明確了蚓孔突破污染帶是酸化獲得高產(chǎn)的關(guān)鍵因素;且在蚓孔突破污染帶時,對于裸眼完井蚓孔密度越小越經(jīng)濟,而對于射孔完井在一定范圍內(nèi)增大蚓孔密度(分支蚓孔數(shù)量)卻能獲得可觀的產(chǎn)量增長;針對不同滲透率的儲層,模擬計算發(fā)現(xiàn)儲層滲透率越低,蚓孔的增產(chǎn)效果越明顯,低滲透儲層的增產(chǎn)倍比主要受主蚓孔的長度所控制。
[Abstract]:Matrix acidification is one of the most important means of improving and increasing production in carbonate reservoir development. Matrix acidification mainly uses acid convection by injecting active acid into the reservoir under appropriate displacement conditions. Diffusion and acidite reaction formed a high permeability wormhole in the near well zone, communicated the original formation area, reduced the epidermal coefficient of the near well zone, and realized the increase of production. In the matrix acidification, the early pollution was accurately predicted. The simulation of wormhole expansion and productivity calculation in the presence of wormhole are important problems in the study of acidizing and increasing production mechanism of carbonate reservoir and the evaluation of its effect. Oil well pollution prediction is mostly based on oil-water two-phase flow equation. In the wormhole expansion model, the two-scale model is more mature. However, most of the scholars at home and abroad use the average permeability to simplify the productivity calculation of the acidified area where the wormhole exists. Thus, the analytical solution is derived for productivity calculation, which ignores the heterogeneity of strata and irregular growth of wormholes. It is very important to establish a more accurate model to calculate the productivity of acidate wormhole in order to improve the mechanism of acidogenic acid acidosis and increase production. In this paper, the expansion law of acid-wormhole and its productivity calculation in carbonate rock matrix acidification are studied. . Based on the related knowledge of petroleum engineering and reservoir numerical simulation, the depth of reservoir pollution, the law of wormhole expansion and the productivity of acid-etching wormhole are calculated. The following results are obtained: 1) the model of mud contamination depth prediction and damage permeability calculation under two-dimensional radial condition is established, which provides data for the simulation of wormhole expansion in later stage. (2) by using the two-scale growth model of dimensionless wormhole, the propagation law of wormhole under different phase angle and perforation position is simulated and analyzed. At the same time, a new method is established to calculate the productivity of wormhole expansion model and oil-water two-phase flow model. 3) through the new method of productivity calculation in this paper, the effects of the length of vermis hole, density of vermis hole and completion method on acidizing productivity of vertical well are analyzed. It is clear that the key factor of obtaining high yield of acidizing is the breakthrough of contamination zone of vermis hole. When the wormhole breaks through the contamination zone, the smaller the density of wormhole is, the more economical it is, but the larger the density of wormhole (the number of branch wormholes) increases in a certain range for perforation completion, the higher the production can be. For the reservoirs with different permeability, it is found that the lower the reservoir permeability is, the more obvious the productivity of wormhole is, and the ratio of increasing production of low permeability reservoir is mainly controlled by the length of the main wormhole.
【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】：2017
【分類號】：TE357.2

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