【摘要】：外加直流電場(chǎng)提高原油采收率是近些年提高原油采收率的一種新技術(shù),油氣資源短缺一直都是世界各國(guó)面臨的一大難題,而國(guó)內(nèi)各大高滲透油田相繼進(jìn)入高含水期,而新探明油藏大多為低滲透油藏,原油開(kāi)采方式難以滿足需要,因此利用外加電場(chǎng)提高采收率有很廣闊的發(fā)展?jié)摿�。本文在電滲理論的基礎(chǔ)上搭建了外加電場(chǎng)作用下縫隙介質(zhì)中兩相流數(shù)學(xué)模型,推導(dǎo)出兩相流的有限元方程,并利用COMSOL Multiphysics耦合軟件進(jìn)行有限元方法求解,從理論上分析了含水飽和度與水相相對(duì)滲透率在相滲曲線上的關(guān)系,討論了外加電場(chǎng)存在時(shí)含水飽和度比無(wú)電場(chǎng)存在時(shí)更低的現(xiàn)象,并且驗(yàn)證了外加電場(chǎng)作用下縫隙介質(zhì)中兩相流數(shù)學(xué)模型的正確性。本文細(xì)致分析了外加電場(chǎng)存在情況下縫隙媒介模塊中含水飽和度的變化趨勢(shì),構(gòu)建了外加電場(chǎng)作用下不同縫隙寬度、不同縫隙數(shù)量和不同縫隙結(jié)構(gòu)的縫隙媒介模塊,并進(jìn)行數(shù)值模擬及分析,研究結(jié)論表明,所施加電場(chǎng)可使縫隙介質(zhì)模塊中含水飽和度下降;縫隙媒介模塊的含水飽和度隨縫隙寬度的減小而下降,則縫隙媒介模塊滲透率越低所受施加電場(chǎng)影響越大;而且所施加電場(chǎng)對(duì)縫隙數(shù)量越少和連通度越小的模型中含水飽和度影響越大。通過(guò)深入研究發(fā)現(xiàn),在0~240V范圍內(nèi),當(dāng)外加直流電場(chǎng)為160V時(shí)電場(chǎng)在各縫隙模型中產(chǎn)生的效果最顯著,兩相流模塊內(nèi)含水飽和度最小,含油飽和度最大。根據(jù)數(shù)值模擬結(jié)果,把160V當(dāng)作穩(wěn)壓直流電源輸出的設(shè)計(jì)要求,結(jié)合Buck電路,軟開(kāi)關(guān)技術(shù)及雙閉環(huán)控制電路進(jìn)行穩(wěn)壓直流電源的設(shè)計(jì),在仿真軟件MATLAB中進(jìn)行仿真與驗(yàn)證,得到可靠輸出的直流電場(chǎng)。
[Abstract]:In recent years, increasing oil recovery by adding direct current electric field is a new technology to improve oil recovery. The shortage of oil and gas resources has always been a big problem facing countries all over the world, and the major domestic high permeability oilfields have entered into high water cut period one after another. However, most of the newly proved reservoirs are low permeability reservoirs, so it is difficult to meet the needs of crude oil production, so it has a broad development potential to improve oil recovery by using external electric field. On the basis of electroosmotic theory, the mathematical model of two-phase flow in slot medium under the action of external electric field is built, the finite element equation of two-phase flow is derived, and the finite element method is solved by using COMSOL Multiphysics coupling software. The relationship between water saturation and relative permeability of water phase on the phase permeability curve is analyzed theoretically. The phenomenon that the water saturation is lower in the presence of external electric field than in the absence of electric field is discussed. The mathematical model of two-phase flow in slit medium under the action of external electric field is verified. In this paper, the variation trend of water saturation in gap media module under the condition of external electric field is analyzed in detail, and the slot media module with different gap width, different slot number and different slot structure under the action of external electric field is constructed. The numerical simulation and analysis show that the applied electric field can decrease the water saturation in the slot dielectric module. The water saturation of gap media module decreases with the decrease of gap width, and the lower the permeability of gap medium module is, the greater the effect of applied electric field is on the permeability of slot media module. Moreover, the effect of the applied electric field on the water saturation in the model with less gap number and less connectivity is greater. It is found that when the applied DC field is 160 V, the effect of the electric field in each slot model is the most significant, the water saturation in the two-phase flow module is the least, and the oil saturation is the largest in the two-phase flow module. According to the results of numerical simulation, 160V is regarded as the design requirement of the output of DC power supply with stable voltage, and the design of stabilized DC power supply is carried out by combining Buck circuit, soft switch technology and double closed-loop control circuit. The simulation and verification are carried out in the simulation software MATLAB. A reliable output DC field is obtained.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE348;TN86

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