Volume 39 Issue 4
Jul.  2022
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LI Jiyong, SUN Yuhai, LU Zhanguo, et al. a solid acid block removing system for carbonate reservoirs[J]. Drilling Fluid & Completion Fluid,2022, 39(4):516-521 doi: 10.12358/j.issn.1001-5620.2022.04.018
Citation: LI Jiyong, SUN Yuhai, LU Zhanguo, et al. a solid acid block removing system for carbonate reservoirs[J]. Drilling Fluid & Completion Fluid,2022, 39(4):516-521 doi: 10.12358/j.issn.1001-5620.2022.04.018

A Solid Acid Block Removing System for Carbonate Reservoirs

doi: 10.12358/j.issn.1001-5620.2022.04.018
  • Received Date: 2022-02-16
  • Accepted Date: 2022-04-20
  • Rev Recd Date: 2022-03-20
  • Publish Date: 2022-07-30
  • Conventional acid block removing systems generally are formulated with common liquid acids such as hydrochloric acid or nitric acid. These liquid acids have high costs and safety risks in storing, transportation and operation. To solve these problems, three solid acids, which are sulfamic acid, citric acid and diethyl triamine penta-acetic acid, are selected to study their dissolution capacity and capability of stabilizing iron ions. By adjusting the ratio of the three acids, the optimum ratio was determined to be∶m(sulfamic acid)∶m(citric acid)∶m(diethyl triamine penta-acetic acid) = 8∶1∶1. A solid acid block removing system was formulated using the compound solid acid as the main additive, coupled with corrosion inhibitor, penetrant and clay swelling inhibitor. This solid acid block removing system has the ability to dissolve calcium carbonate; a percent rate of dissolution of 27.65% of marble was obtained with the solid acid block removing system. The solid acid block removing system has iron ion complex capacity of 643.71 mg/L, a good iron ion stabilizing performance. Core flow experimental results showed that when the solid acid block removing system was injected into the core by 10 PV, the permeability of the core was increased by at least 20%. Field operation has shown that the application of this solid acid block removing system resulted in higher production rate of hydrocarbons.

     

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