Volume 40 Issue 2
Mar.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(2): 176-183
XU Jiang, WU Yu, AN Zhiwei, et al.Study and application of high-temperature resistant non-sulfonated semi-saturated salt water drilling fluid[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：176-183 doi: 10.12358/j.issn.1001-5620.2023.02.005
Citation: XU Jiang, WU Yu, AN Zhiwei, et al.Study and application of high-temperature resistant non-sulfonated semi-saturated salt water drilling fluid[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：176-183 doi: 10.12358/j.issn.1001-5620.2023.02.005
shu

Study and Application of High-temperature Resistant Non-sulfonated Semi-saturated Salt Water Drilling Fluid

doi: 10.12358/j.issn.1001-5620.2023.02.005
  • 1.

    Sinopec Petroleum Engineering Technology Research Institute Co., Ltd., Beijing 102206

  • 2.

    Jingzhou Jiahua Technology Co. Ltd., Jingzhou, Hubei 434000

  • 3.

    Sinopec North China Petroleum Engineering Co., Ltd., Zhengzhou, Henan 450000

  • 4.

    Department of Petroleum Engineering, Yangtze University, Wuhan Hubei 430100

  • 5.

    Key Laboratory of Drilling and Production Engineering for Oil and Gas, Hubei Province, Wuhan, Hubei 430100

  • Received Date: 2022-10-17
  • Rev Recd Date: 2022-12-01
  • Publish Date: 2023-03-30
    Abstract
  • Aiming at the problems of poor environmental performance of sulfonated water-based drilling fluid and the insufficient temperature resistance of existing non-sulfonated water-based drilling fluid, the non-sulfonated humic acid resin filtration reducer DEM-SEAL was synthesized on the basis of the mixed raw materials of humic acid, lignin and tannin extract, and was modified by silane coupling agent, organic acid and diamine, and it was analyzed and characterized by infrared spectrum, thermogravimetry and gel chromatography. The experimental results show that the temperature resistance of DEM-SEAL was 180 ℃, the LC50-96 h was 101,020 mg/L, the total sulfur content was 0, which is non-toxic and environmentally friendly. When the dosage of DEM-SEAL was 4.0%, the API filtration and HTHP filtration of the base slurry aged at 180 ℃ were only 7.6 mL and 16.8 mL, with a reduction rate of 75.2% and 83.0%, and it was little impact on the viscosity of mud. Combined with the excellent characteristics of DEM-SEAL, a set of high-temperature resistant non-sulfonated semi-saturated salt water drilling fluid system was constructed. The density range was 1.30～1.80 g/cm3, the temperature resistance reached 180 ℃, the API filtration was less than 5.0 mL, the HTHP filtration was less than 15.0 mL, which has good performance of rheological and low filtration. The LC50-96 h was 55,600 mg/L, and the BOD5/CODcr was 23.51%, which is non-toxic and biodegradable. The system has been successfully applied in a high temperature and deep well in Xinjiang oilfield. The bottom hole temperature was 179 ℃, the rheological property was stable in the drilling process, the filtration and wall building performance was good, and there were no complex accidents of borehole. Under the premise of safe drilling, the objective of "non-sulfonation" of high-temperature resistant drilling fluid was realized, which provided technical reference for the research and development of high-temperature non-sulfonated drilling fluids in China.

     

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