科研之友
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摘要
Matrix acidizing is a commonly used method in petroleum engineering for chemically removing near-wellbore formation damage and creating new pathways for restoring production. Sandstones acidizing is in particular complex since sandstones in general are composed of varied minerals which behave or react differently in contact with acidizing fluids. In real projects, sandstone acidizing is usually performed by injecting mud acid, a mixture of hydrochloric acids (HCl) and hydrofluoric acids (HF) in proportions according to the sandstone conditions, with additional chemicals if necessary. Simulating acidizing process in the lab-scale cores is a crucial step before a numerical model is applied in the field. A numerical model was developed in this paper to simulate the acidizing process in lab-scale sandstone cores. The transport and reaction equations of the acid reactant and minerals in lab-scale cylindrical sandstone cores were adopted in the model. The two-acid, three-mineral model was introduced to simulate the acidizing reaction process. Some equations evaluating the relationship between permeability and porosity were incorporated in the model, including the Labrid Equation, Lund and Fogler Equation, and Walsh and Brace Equation. Both the lab experiments and numerical simulation on acidizing Liaohe Sandstone were conducted in the present paper. By comparing the calculated results and measure data, the Labrid equation was found to be the most suitable to evaluate the relationship between permeability and porosity for Liaohe Sandstone. The max difference of permeability after acidizing between present model and experimental measurements is about 13.5%.
- 出版日期2014
- 单位中国石油大学（华东）
