【摘要】：油藏按儲層巖性分類主要包括:砂巖油藏、礫巖油藏、碳酸鹽巖油藏等。中國砂巖油藏的儲量最高,而砂巖的主要成分是石英、長石、黏土礦物等,其中石英的含量居于首位。應用巖心驅(qū)替實驗、石英砂靜態(tài)吸/脫附實驗、模擬油接觸角實驗、Zeta電位實驗研究了鹽水的化學組成對原油中酸/堿極性組分在石英表面吸/脫附的影響。結(jié)果表明,在中性/弱堿性地層水條件下,原油中的酸性極性組分發(fā)生電離,可以通過二價陽離子架橋吸附在石英表面;堿組分不發(fā)生電離處于分子狀態(tài),且與石英表面的范德華力較弱,無法吸附在石英表面。在弱酸性條件下,酸性極性組分因電離被抑制,處于分子狀態(tài),可通過氫鍵吸附在石英表面;堿性組分發(fā)生電離后帶正電,可通過庫侖力吸附在帶負電的石英表面。
[Abstract]:Reservoir classification mainly includes: sandstone reservoir, conglomerate reservoir, carbonate reservoir and so on. The reserves of sandstone reservoirs in China are the highest, and the main components of sandstone are quartz, feldspar and clay minerals, among which the content of quartz is the first. The effects of chemical composition of brine on the adsorption / desorption of acid / alkali polar components on quartz surface in crude oil were studied by using core displacement experiment, static adsorption / desorption experiment of quartz sand and simulated oil contact angle experiment (Zeta potential). The results show that under the condition of neutral / weak alkaline formation water, the acidic polar components of crude oil can be ionized, which can be adsorbed on the surface of quartz through a bridge of divalent cations, while the alkali components are not ionized in molecular state. Moreover, the van der Waals force on quartz surface is weak and can not be adsorbed on quartz surface. Under the condition of weak acidity, the acidic polar component is inhibited by ionization and is in a molecular state, which can be adsorbed on the surface of quartz by hydrogen bond, while the basic component is ionized with positive charge, which can be adsorbed on the surface of negatively charged quartz by Kulun force.
【作者單位】： 中國石油大學提高采收率研究院;中國石油化工股份有限公司勝利油田分公司濱南采油廠;
【分類號】：TE311;TE357.6
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本文編號：2237428