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采用静态实验的方法研究了油藏砂岩中粘土矿物与碱的作用。借助于滴定装置,确定了60℃条件下三种粘土矿物以及石英与碱反应的化学动力学特征。测定了上层清液中氢氧根离子、(Si)和(Al)的浓度,并用 X 射线衍射方法分析了反应后固体产物的成分。结果表明:蒙脱石碱耗最大,在反应初期,速度较快,以后逐渐变慢,在此阶段,反应按一级反应规律变化。在反应发生的同时,伴随有新矿物的生成,其矿物成分主要以沸石(Na-P_2)为主。反应结果消耗的是反应体系中的(Al),而不是(Si)。另一方面,在室温下,研究了与化学反应同时发生的快速可逆离子交换碱耗。氢、钠离子交换吸附等温线表观上符合 Langmuir 方程。实验结果表明,蒙脱石的可逆碱耗最大。通过应用高盐预洗接着注入低盐的碱液的方法,可以使油层砂岩的可逆碱耗减小。
The effect of clay minerals and alkali in reservoir sandstone was studied by static experiment. With the help of titration device, the chemical kinetics of three clay minerals and the reaction of quartz and alkali at 60 ℃ were determined. The concentrations of hydroxyl ions, (Si) and (Al) in the supernatant were measured and the composition of the solid product after the reaction was analyzed by X-ray diffraction. The results showed that the alkali loss of montmorillonite was the largest, which was faster at the initial stage of reaction and then gradually slowed down. At this stage, the reaction varied according to the first order reaction. In response to the occurrence of the same time, accompanied by the formation of new minerals, the main mineral composition of zeolite (Na-P 2) -based. The result of the reaction consumes (Al) rather than (Si) in the reaction system. On the other hand, at room temperature, the fast reversible ion-exchange base depletion was studied at the same time as the chemical reaction. Hydrogen and sodium ion exchange adsorption isotherms fit the Langmuir equation. The experimental results show that the reversible alkali loss of montmorillonite is the largest. By applying a high salt pre-wash followed by a low salt lye, the reversible base loss of the reservoir sandstone can be reduced.