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Novel Viscoelastic Surfactant-Based Self-Diverting Acid Systems for Carbonate Acidizing

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Chemistry and Technology of Fuels and Oils Aims and scope

Novel viscoelastic self-diverting acid (VDA) systems with and without cosurfactant (sodium dodecylbenzenesulfonate, SDBS) added to enhance reaction retardation and to improve the conventional VDA system are studied. The novel system viscosifies at a pH of ~0.6 and attains a viscosity of ~500 mPa·s. The system without added SDBS viscosifies at a pH of ~2.2 and reaches a final viscosity of 403 mPa·s. Studies of the limestone—acid reaction kinetics showed that the reaction rate fell from 1.37·10–4 mol/(cm2·s) for 20 wt. % HCl solution to 13.2·10–6 and 6.5·10–6 mol/(cm2·s) for VDA solutions without and with added SDBS, respectively. The reaction rate constants (k) for the negative sample control and VDA systems I and II were 1.0740·10–1 (mol/cm3)(–0.3092)·(cm/s), 5.5221·10–4 (mol/cm3)(0.2822)·(cm/s), and 6.3154·10–5 (mol/cm)(0.5554)·(cm/s), respectively. A dual-core flow test showed that wormholes were produced in both cores for the VDA systems rather than a large single channel in a high-permeability core when 20 wt.% HCl solution is used. Thus, a smaller volume of SDBS is needed for flow formation when VDA solution is added. The studies revealed that the novel VDA system retards reaction considerably, improves acid diversion, and has tremendous potential for field applications.

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Authors and Affiliations

  1. School of Energy Resource, Chengdu University of Technology, Chengdu, China

    Qiangbo Mi, Chengyong Li & Xiangyi Yi

  2. Sinopec Research Institute of Petroleum Engineering, Beijing, China

    Jun Zhou

Authors
  1. Qiangbo Mi
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  2. Chengyong Li
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  3. Xiangyi Yi
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  4. Jun Zhou
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Correspondence to Chengyong Li.

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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 4, pp. 44 – 49, July – August, 2017.

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Mi, Q., Li, C., Yi, X. et al. Novel Viscoelastic Surfactant-Based Self-Diverting Acid Systems for Carbonate Acidizing. Chem Technol Fuels Oils 53, 520–528 (2017). https://doi.org/10.1007/s10553-017-0831-5

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