泡沫流体密度-压力-温度关系的实验研究

泡沫流体在石油工程中是一种优良的入井液,泡沫密度的确定对现场应用具有重要的意义。建立了 地层条件下测定泡沫流体密度的实验装置和测量方法,测定和分析泡沫流体密度随着压力和温度的变化关系,研究 了气液质量比对泡沫密度变化规律的影响,把实验数据进行了公式回归,并把实验结果与近似计算结果进行了比 较。结果表明泡沫流体的密度随压力的增大而增大,随着温度的增高而降低,泡沫流体的气液质量比越大可压缩性 越好。实验测得的泡沫密度总是小于近似计算的密度值,误差在1.45%~11.31%,存在误差的原因是近似计算没有 考虑液膜表面吸附的表面活性剂双电层离子间产生的斥力,回归公式与实验数据吻合较好。研究结果可为泡沫流 体在油田的应用提供理论指导。

Measurement of Density-Pressure-Temperature Relation for Foam Fluid

Foam fluid has good property, widely used in petroleum engineering. Density of foam fluid is very important in site application. Device designing used to measure density of foam fluid was introduced under underhole situation. Method to quantitatively determine the density- pressure-temperature relation of the foam fluid was also put forward. The relations between the density of the foam fluid and the pressure and temperature were measured using the method. Experiential formulas calculating density of foam fluid were gained through regression method. The results of measurement and conventional calculation were compared. It shows that density of foam fluid increases with pressure increases, and decreases with temperature increases. The larger the ratio of gas and liquid weight in foam fluid is, the better the condensability of foam fluid is. The measured density of foam fluid is always less than that of calculated by conventional method. Difference lies in 1.45 % to 11.31%. The reason is that repellent force of surfactant ions has not been considered when calculating by conventional method. The regressed formulas have good accordance with the experimental data. The research conclusions can direct foam fluid application in oil field.