Volume 40 Issue 1
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WANG Yaocong, CHANG Du, ZHANG Qingzhu, et al.Study and application of temperature-responsive blockage removal agent in oilfield[J]. Drilling Fluid & Completion Fluid,2023, 40(1):137-142 doi: 10.12358/j.issn.1001-5620.2023.01.019
Citation: WANG Yaocong, CHANG Du, ZHANG Qingzhu, et al.Study and application of temperature-responsive blockage removal agent in oilfield[J]. Drilling Fluid & Completion Fluid,2023, 40(1):137-142 doi: 10.12358/j.issn.1001-5620.2023.01.019

Study and Application of Temperature-responsive Blockage Removal Agent in Oilfield

doi: 10.12358/j.issn.1001-5620.2023.01.019
  • Received Date: 2022-07-09
  • Rev Recd Date: 2022-10-20
  • Publish Date: 2023-01-31
  • A pore throat blockage sample was tested and analyzed for its composition with high temperature calcination method and X-ray diffraction method. Based on the results of the test and analysis, a temperature-responsive reservoir blockage removing agent MSA is developed with polyethylene glycol, sulfamic acid and lauroyl chloride. The general performance of MSA was evaluated by laboratory experiment. The reservoir blockage used in the experiment is mainly composed of calcite (CaCO3). MSA has a pH of 6.05 at 20 °C and 0.99 at 60 °C, this means that MSA decomposes at 60 °C and produces a large amount of sulfamic acid with which the blockage can be dissolved. More than 82% of the blockage can be dissolved after 30 min of interaction between the blockage and MSA, and at 90 °C, each component of MSA still retains high activity, meaning that MSA has good blockage removing capacity and compatibility with the formation waters. Field application of MSA showed that a production well treated with MSA had oil production increased by 66.9 t in 6 months.

     

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