Volume 40 Issue 1
Jan.  2023
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MA Yingxian, TIAN Bohan, MAO Yuan, et al.Study and application of an intelligent self-diverting acidizing technology for buried-hill reservoir development[J]. Drilling Fluid & Completion Fluid，2023, 40（1）：118-124 doi: 10.12358/j.issn.1001-5620.2023.01.016
Citation: MA Yingxian, TIAN Bohan, MAO Yuan, et al.Study and application of an intelligent self-diverting acidizing technology for buried-hill reservoir development[J]. Drilling Fluid & Completion Fluid，2023, 40（1）：118-124 doi: 10.12358/j.issn.1001-5620.2023.01.016
shu

Study and Application of an Intelligent Self-Diverting Acidizing Technology for Buried-Hill Reservoir Development

doi: 10.12358/j.issn.1001-5620.2023.01.016
  • 1.

    Petroleum Engineering School, Southwest Petroleum University, Chengdu，Sichuan 610500

  • 2.

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu，Sichuan 610500

  • 3.

    Hekou Oil Production Plant, Shengli Oilfield Branch, Sinopec Corporation, Dongying，Shandong 257002

  • Received Date: 2022-08-15
  • Rev Recd Date: 2022-10-07
  • Publish Date: 2023-01-31
    Abstract
  • The buried-hill reservoirs in the Shengli Oilfield have these characteristics: deep buried depths, high temperatures, large spans and highly developed fractures and vugs. In well acidizing operation, the acids are easy to be lost into the fractured formations, the reservoir formations with low permeability are poorly acidized, and after acidizing operation, different pay zones have permeabilities that are greatly different. To solve these problems, an instant high-temperature stable self-diverting agent was developed by introducing hydroxyalkyl sulfonic acid into long-chain fatty acid amide betaine to improve the solubility and temperature resistance of the latter. A self-diverting acid was then developed by mixing the self-diverting agent and HCl. The acid was carefully formulated and its properties were studied. It was found that this instant high-temperature stable self-diverting acid has the ability of fast viscosity development, and is resistant to the negative effects of high temperature and shearing. It can be used to acidize reservoir formations of 160 ℃. This self-diverting acid has satisfactory viscosity at pH values between 3 and 7, and has good diverting performance. Acid flooding displacement through double cores shows that for parallel cores with permeability difference below 10, these cores can be acidized with good uniformity. This self-diverting acid has been successfully used on 37 wells in the buried-hill reservoir, with average oil production increase of 7.3 t/d per well, and average liquid production increase of 11.5 m3/d per well, showing good performance in oil production enhancement and water production control.

     

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