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Experimental and Numerical Evaluation of Acidizing Effect Duration for Diverting Acids in Reservoirs
Chemistry and Technology of Fuels and Oils ( IF 0.6 ) Pub Date : 2020-05-01 , DOI: 10.1007/s10553-020-01136-4
Liqiang Zhao , Runyu Wang , Pingli Liu , Chong Liang , Honglan Zou , Zhifeng Luo

Acidizing is one of the most economical and effective methods for ensuring the continuous and stable production of an oilfield and improving oil recovery. Diverting acids are more and more widely used in oilfields. However, it is difficult to accurately determine such parameters as acid discharge, concentration, and acid-rock reaction duration before construction, which may result in poor acidizing effect and low economic benefits. In this paper, the viscosity of diverting acid, reaction kinetics of acid rock, and residual acid limit are experimentally determined as well as numerically simulated using pressure, temperature, seepage, and geological models via the MATLAB software. The relationship between diverting time and peak viscosity time of diverting acid (DA) is studied and analyzed. For formation temperatures below the DA gel-breaking temperature, the DA with large displacement and low acid concentration should be selected. For formation temperatures close to the gel-breaking temperature, a medium acid concentration with large discharge rate should be selected. For a formation temperature exceeding the gel-breaking temperature, DA with high acid concentrations and small discharge rate should be selected. When the formation temperature is lower or close to the acid gel-breaking temperature, the acidizing effect of DA can be improved by adjusting the amount of injected acid. When the formation temperature is higher than the acid gel-breaking temperature, high-temperature corrosion inhibitors and adsorbent should be added in order to reduce the acid-rock reaction rate and improve the acidizing effect. The research results are of great significance in field acidizing construction.

中文翻译:

水库导酸酸化效果持续时间的实验与数值评价

酸化是保证油田连续稳定生产、提高采收率的最经济、最有效的方法之一。导流酸在油田中的应用越来越广泛。但在施工前难以准确确定排酸量、浓度、酸岩反应时间等参数,导致酸化效果差,经济效益低。本文通过MATLAB软件利用压力、温度、渗流和地质模型对导酸粘度、酸岩反应动力学和残酸极限进行了实验确定和数值模拟。研究分析了转向时间与转向酸(DA)峰值粘度时间的关系。对于低于DA破胶温度的地层温度,应选择排量大、酸浓度低的DA。对于接近破胶温度的地层温度,应选择中等酸浓度、大排量。对于超过破胶温度的地层温度,应选择高酸浓度和小排量的DA。当地层温度低于或接近酸破胶温度时,可通过调节注入酸量来提高DA的酸化效果。当地层温度高于酸破胶温度时,应加入高温缓蚀剂和吸附剂,以降低酸岩反应速率,提高酸化效果。
更新日期:2020-05-01
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