高矿化度储层油井结盐机理研究
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摘要
明格布拉克区块地层水矿化度高,易发生盐结晶堵塞管柱。通过静态法考察Ca~(2+)、CO_3~(2-)、HCO_3~-,以及Cl~-浓度对析盐结垢的影响,同时结合扫描电镜分析结盐微观形态,发现在高矿化度地层中,结盐分为结垢和析盐两个过程。由于原始地层温度压力很高(163.8℃,118 MPa),压力下降后,CO_2从溶液中析出,CO_2分压下降,导致CaCO_3快速凝结成垢,进而NaCl在晶核附近吸附快速析出。盐析出导致离子浓度降低,活性增强,促进了CaCO_3的沉淀析出速度。结盐是结垢与析盐的相互促进过程。
Formation water salinity at Braque Minger block is high,prone to salt crystallization to plug pipe string. Through the static method to check the influence on salt scaling of calcium ion,sulfate ion,bicarbonate ion and chloride ion concentration,and combined with scanning electron microscopy analysis of salt deposition morphology,it is found that in high salinity formation,salt is classified as scaling and salt crystallization process. Because the original formation pressure is very high temperature( 163. 8 degrees C,118MPa),the CO_2 precipitates from the solution when the pressure drops,and the partial pressure of CO_2 decreases,which led to the rapid condensation of CaCO_3 scale,and Na Cl adsorption in the near nucleation and rapid precipitation. Salting out leads concentration of ion to be decrease,activity to be enhancement,promoting the precipitation rate of CaCO_3. Salt is the mutual promotion of scaling and salt precipitation.
Formation water salinity at Braque Minger block is high,prone to salt crystallization to plug pipe string. Through the static method to check the influence on salt scaling of calcium ion,sulfate ion,bicarbonate ion and chloride ion concentration,and combined with scanning electron microscopy analysis of salt deposition morphology,it is found that in high salinity formation,salt is classified as scaling and salt crystallization process. Because the original formation pressure is very high temperature( 163. 8 degrees C,118MPa),the CO_2 precipitates from the solution when the pressure drops,and the partial pressure of CO_2 decreases,which led to the rapid condensation of CaCO_3 scale,and Na Cl adsorption in the near nucleation and rapid precipitation. Salting out leads concentration of ion to be decrease,activity to be enhancement,promoting the precipitation rate of CaCO_3. Salt is the mutual promotion of scaling and salt precipitation.
引文
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