Volume 36 Issue 5
Oct.  2019
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MU Daifeng, JIA Wenfeng, YAO Yiming, YANG Chen, WANG Chengcheng, JIA Jinya. Study on the Integration of Gelled Acid and Crosslinked Acid to Form High Temperature Retarded Acid[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 634-638. doi: 10.3969/j.issn.1001-5620.2019.05.019
Citation: MU Daifeng, JIA Wenfeng, YAO Yiming, YANG Chen, WANG Chengcheng, JIA Jinya. Study on the Integration of Gelled Acid and Crosslinked Acid to Form High Temperature Retarded Acid[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 634-638. doi: 10.3969/j.issn.1001-5620.2019.05.019
shu

Study on the Integration of Gelled Acid and Crosslinked Acid to Form High Temperature Retarded Acid

doi: 10.3969/j.issn.1001-5620.2019.05.019

  • 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101;

  • 2. Sinopec Research Institute of Petroleum Engineering, Beijing 100101;

  • 3. School of Petroleum Engineering, China University of Petroleum, Beijing 102249

  • Received Date: 2019-06-07
  • Publish Date: 2019-10-30
    Abstract
  • Gelled acid and crosslinked acid are common retarded acids used in acidizing high temperature carbonate rock reservoirs. As different acids, gelled acid and crosslinked acid both have poor high temperature tolerance, poor compatibility with each other and complex formulating and working procedures. To resolve these problems, a retarded acid has been formulated through integration of gelled acid and crosslinked acid. The base fluid of the crosslinked acid can be used as a gelled acid which can be turned into crosslinked acid by adding crosslinking agents. The composition of the crosslinked acid is:20%HCl+1%SRAP-2 (thickening agent)+ 2.5%SRAI-1 (high temperature primary corrosion inhibitor)+0.5% extender+1%SRAF-1(ferric ion stabilizer for acid fracturing)+1% SRAD-1 (demulsifier for acid fracturing)+1% SRAC-2A (crosslinking agent) and SRAC-2B (delayed crosslinking agent) (SRAC-2A:SRAC-2B=2:12). After shearing at 160℃ and 170 s-1 for 120 min, the viscosity of the gelled acid was 20 mPa·s. Time for the crosslinking of the crosslinked acid was 93 s, indicating that the crosslinked acid had excellent delayed crosslinking property. After shearing at 160℃ and 170 s-1 for 90 min, the viscosity of the crosslinked acid was 55 mPa·s. This integrated acid can stand at room temperatures for more than 10 d, and the dynamic rate of corrosion at 140℃ was 46.1021 g/(m2·h). Research work shows that this integrated acid is able to satisfy the needs for retarded acid in acid fracturing high temperature reservoirs. Integration of gelled acid and crosslinked acid simplifies field operation, and should have good application prospects.

     

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