發(fā)布時(shí)間：2018-03-05 12:26

  本文選題：非均相復(fù)合體系　切入點(diǎn)：穩(wěn)定性　出處：《中國(guó)石油大學(xué)(華東)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：聚合物驅(qū)近年來(lái)廣泛應(yīng)用于我國(guó)各大油田,技術(shù)已經(jīng)相當(dāng)成熟,但聚合物驅(qū)后油層中仍有大量殘余油分布,有待于采取進(jìn)一步措施進(jìn)行挖潛。因此采用由聚合物和PPG復(fù)配而成的非均相復(fù)合驅(qū)油體系,探討了該體系的穩(wěn)定性與流變性能,評(píng)價(jià)了其驅(qū)油效果,并系統(tǒng)研究了PPG驅(qū)替殘余油的機(jī)理。采用流變法、稱重法及篩網(wǎng)過(guò)濾法分別研究了PPG的流變性能、膨脹性能及封堵性能,以此為依據(jù)篩選出合適的樣品,并研究了該樣品的耐溫、耐鹽及耐酸堿性。高彈性PPG顆粒易破碎而低彈性PPG顆粒不能對(duì)篩網(wǎng)進(jìn)行有效封堵,綜合考慮膨脹倍數(shù)及彈性,選擇中彈性的2#PPG作為研究對(duì)象,且該P(yáng)PG具有一定的的耐溫、耐鹽及耐酸堿性。將篩選出的PPG和聚合物溶液復(fù)配為非均相復(fù)合體系,利用穩(wěn)定性分析儀和流變儀分別研究了其穩(wěn)定性及流變性能。非均相復(fù)合體系穩(wěn)定性隨聚合物濃度增大而增強(qiáng),隨PPG濃度增加而減弱。非均相復(fù)合體系最佳配方為:1000mg/L聚合物濃度+1000mg/L PPG。隨溫度的升高非均相復(fù)合體系的儲(chǔ)能模量減小;隨各鹽離子濃度的升高而降低;隨pH的升高有所降低,但總體變化不大。利用化學(xué)驅(qū)動(dòng)態(tài)模擬實(shí)驗(yàn)裝置評(píng)價(jià)了非均相復(fù)合體系的驅(qū)油效果。PPG與聚合物溶液復(fù)配驅(qū)油不僅能降低聚合物用量,還能在聚合物驅(qū)基礎(chǔ)上有效提高采收率。PPG可有效封堵高滲層,對(duì)于聚合物驅(qū)后的均質(zhì)或非均質(zhì)地層均可提高采收率。利用可視化微觀驅(qū)油手段研究了PPG在多孔介質(zhì)中的運(yùn)移規(guī)律,并揭示了PPG驅(qū)替殘余油的機(jī)理。PPG在多孔介質(zhì)中運(yùn)移方式多樣化,其中對(duì)降低殘余油飽和度起主要作用的有變形通過(guò)、隔斷通過(guò)及堵塞,粘附及直接通過(guò)則起次要作用。聚合物驅(qū)后油層中殘余油的存在形式主要有膜狀、簇狀、柱狀及盲端,非均相復(fù)合體系PPG選擇性封堵機(jī)理及顆粒彈性變形驅(qū)油機(jī)理可有效減少膜狀、簇狀及柱狀殘余油,對(duì)盲端驅(qū)替效果不佳。
[Abstract]:Polymer flooding has been widely used in various oil fields in China in recent years. The technology has been quite mature, but there are still a large number of residual oil distribution in the reservoir after polymer flooding. Therefore, the heterogeneous composite oil displacement system composed of polymer and PPG is used to study the stability and rheological properties of the system, and the oil displacement effect is evaluated. The rheological properties, swelling properties and plugging properties of PPG were studied by rheological method, weighing method and sieve filtration method respectively. The temperature tolerance, salt tolerance and acid and alkali resistance of the sample were studied. The high elastic PPG particles were easily broken, but the low elastic PPG particles could not effectively block the sieve mesh. Considering the expansion ratio and elasticity, the medium elastic 2 #PPG was selected as the research object. The PPG has a certain temperature tolerance, salt resistance and acid and alkali resistance. The selected PPG and polymer solution are mixed into heterogeneous composite system. The stability and rheological properties of heterogeneous composite system were studied by using stability analyzer and rheometer. The stability of heterogeneous composite system increased with the increase of polymer concentration. The optimal formulation of heterogeneous composite system is: 1: 1000mg / L polymer concentration 1000mg / L PPG. The storage modulus of heterogeneous composite system decreases with the increase of temperature, decreases with the increase of salt ion concentration, and decreases with the increase of pH. But the overall change is not obvious. The oil displacement effect of heterogeneous composite system. PPG and polymer solution combined flooding can not only reduce the amount of polymer, but also the dynamic simulation device of chemical flooding is used to evaluate the oil displacement effect of heterogeneous composite system. On the basis of polymer flooding, the oil recovery. PPG can effectively seal the high permeability layer. For homogeneous or heterogeneous formations after polymer flooding, oil recovery can be improved. The migration law of PPG in porous media is studied by means of visual microscopic oil displacement. The mechanism of PPG displacement of residual oil is revealed. The migration modes of PPG in porous media are diversified, among which the deformation passage, partition passage and blockage play a major role in reducing residual oil saturation. Adhesion and direct passage play a secondary role. The main forms of residual oil in polymer flooding are membrane, cluster, columnar and blind end. The selective plugging mechanism of PPG and the displacement mechanism of granular elastic deformation in heterogeneous composite system can effectively reduce film, cluster and columnar residual oil, which is not good for blind end displacement.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE357.46

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