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<p>The B oilfield is an ultra-deepwater carbonate reservoir where lost circulation of wellbore fluids during drilling and completion operations often leads to formation damage. Based on the petrophysical data of reservoir cores from the B oilfield, artificial cores mimicking the target reservoir characteristics were prepared. Multiple wellbore fluid systems (drilling fluids, completion fluids, and acidizing fluids) were configured, and their formation damage and remediation effects were evaluated through artificial core experiments. Results indicate that completion fluid systems primarily composed of NaCl and CaCl<sub>2</sub> achieved a permeability recovery rate of 80–90%. Acetic acid-based drilling fluid remediation fluids restored permeability by 88–96%, while glutamic diacetic acid (GLDA)-based completion fluid remediation fluids achieved up to 99% permeability recovery. Additionally, filtered seawater-based completion fluids exhibited a maximum turbidity of 31 NTU when mixed with formation water, and the maximum viscosity increase of crude oil reached 156.8 mPa·s, with an EC<sub>50</sub> value exceeding 30,000 mg/L. The study concludes that NaCl/CaCl<sub>2</sub>-based drilling/ completion fluids, along with acetic acid and GLDA-based remediation fluids, are viable clean wellbore fluid systems for carbonate reservoirs. Filtered seawater-based completion fluids also demonstrate potential as low-damage alternatives.</p>

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Evaluation and Recommendations for Clean Wellbore Fluid Systems in Ultra-Deepwater Carbonate Reservoirs

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Bahdar Baltabik,
  • Tuo Zhou,
  • Yixin Gu,
  • Yuguang Ye,
  • Gang Wang,
  • Fuhua Jiang,
  • Haiqiu Zhou,
  • Xiangji Kong,
  • Yue Xiao,
  • Jitong Liu,
  • Xuefeng Chen,
  • Yilin Gao

摘要

The B oilfield is an ultra-deepwater carbonate reservoir where lost circulation of wellbore fluids during drilling and completion operations often leads to formation damage. Based on the petrophysical data of reservoir cores from the B oilfield, artificial cores mimicking the target reservoir characteristics were prepared. Multiple wellbore fluid systems (drilling fluids, completion fluids, and acidizing fluids) were configured, and their formation damage and remediation effects were evaluated through artificial core experiments. Results indicate that completion fluid systems primarily composed of NaCl and CaCl2 achieved a permeability recovery rate of 80–90%. Acetic acid-based drilling fluid remediation fluids restored permeability by 88–96%, while glutamic diacetic acid (GLDA)-based completion fluid remediation fluids achieved up to 99% permeability recovery. Additionally, filtered seawater-based completion fluids exhibited a maximum turbidity of 31 NTU when mixed with formation water, and the maximum viscosity increase of crude oil reached 156.8 mPa·s, with an EC50 value exceeding 30,000 mg/L. The study concludes that NaCl/CaCl2-based drilling/ completion fluids, along with acetic acid and GLDA-based remediation fluids, are viable clean wellbore fluid systems for carbonate reservoirs. Filtered seawater-based completion fluids also demonstrate potential as low-damage alternatives.