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润湿性决定油水在储层孔隙中的分布,影响毛管力的大小和方向,对提高采收率有重要意义。本文致力于研究储层矿物性质和含量对润湿接触角的影响,首先测定大庆油田F储层的47块天然岩心润湿接触角,及各种矿物的绝对含量。然后以矿物绝对含量为横坐标,以接触润湿角为纵坐标,通过趋势线拟合方程,进行定量分析。发现大庆F储层矿物中,亲水性由强到弱依次为,硅酸盐类、氧化物和磷酸盐类;亲油性由强到弱依次为,碳酸盐类、硫酸盐类和硫化物类矿物。润湿接触角与储层矿物绝对含量之间经验公式为,y=axb,其中b值是由矿物的化学性质决定的,当b>0时,矿物亲油,b越大,亲油性越强;反之亲水,b越小,亲水性越强。
Wettability determines the distribution of oil and water in the reservoir pores, affecting the size and direction of capillary force, to improve oil recovery is important. This paper is devoted to studying the influence of reservoir mineral properties and content on wetting contact angle. First, the contact angle of 47 natural cores in F reservoir of Daqing Oilfield and the absolute content of various minerals are determined. Then the mineral absolute content as the abscissa, contact wetting angle for the vertical axis through the trend line fitting equation for quantitative analysis. It is found that the hydrophilicity in the Daqing F reservoir minerals is silicate, oxide and phosphate, and the order of the lipophilicity from strong to weak is carbonates, sulfates and sulfides mineral. The empirical formula between the wetting contact angle and the absolute mineral content of the reservoir is y = axb, where b is determined by the chemical nature of the mineral. When b> 0, the mineral is lipophilic, the larger the b, the stronger the lipophilicity ; The other hand, hydrophilic, b smaller, more hydrophilic.