水力脉冲条件下盐酸酸化模型研究

The Study about Model of Hydrochloric Acidification under the Condition of Hydraulic-pulse

随着油田开发时间的延长,油层堵塞类型和堵塞特征日趋复杂。现有的解堵降压措施的效果逐渐下降,已不能完全适应油田开发的需要。水力脉冲-化学复合增产技术就是将振源产生的脉冲波与化学增产措施复合来进行特殊复杂油气田开发的一种新型复合增产技术。运用阿列维偏微分方程组描述,得出了水力脉冲条件下流体在地层孔隙的流速方程。结合水力脉冲力学公式和酸化模型,得出了在水力脉冲条件下,盐酸酸化时浓度分布、反应速度以及砂岩矿物浓度的变化模型;并通过C-N差分方程进行求解,为此技术的推广应用提供了理论支持。

With the extension of time for oil field development, the types and features of jam in reservoir are more and more complexly. The effect of existing measures for broken down and decompression is gradually decreased, it can not fully meet the needs of oilfield development. Hydraulic pulse-chemical compound broken down is a new compound yield technology ,it contacts pulse wave with chemical measures to develop specially complex oil and gas field. In this paper, based on Allievi partial differential equations describing, the velocity equation under the condition of hydraulic-pulse in the pore is obtained. Combination the mechanical equation of hydraulic-pulse and acidification model,the model can be obtained, which is ,under the hydraulic-pulse condition, distribution of consistence in hy- drochloric acidification, reaction rate and changes in the consistence of carbonate minerals. The equations are solved by C-N difference equation. This model provides a theoretical support for promotion and application of this technology.