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<p>Due to the low permeability, fine pore-throat structure, well-developed fractures, and high clay mineral content of tight gas reservoirs, it is difficult to effectively prevent and mitigate reservoir damage during drilling, which consequently reduces gas well productivity and increases both well construction investment and subsequent treatment costs. By systematically analyzing the pore-throat structure, mineral composition, and sensitivity characteristics of the reservoir, the key mechanisms of reservoir damage—such as solid-phase plugging, liquid trapping, and fracture-induced lost circulation—are identified. Based on these mechanisms, self-degradable temporary plugging agents, water-blocking (anti-water-locking) agents, and acid-soluble consolidation plugging agents are developed accordingly. On this basis, the corresponding treatment agents are optimized, and a low-damage reservoir-protection drilling fluid system is established. By integrating the low-damage reservoir-protection drilling fluid, acid-soluble consolidation plugging agents, and horizontal well drilling-rate enhancement technology, a complete reservoir-protection drilling fluid and drilling technology system suitable for tight gas reservoirs in northern Hubei Province is formed. Field applications demonstrate that this integrated technology effectively reduces drilling-induced reservoir damage, improves single-well gas production, and enables natural production in some wells. The proposed technology is therefore of great significance for promoting the large-scale, efficient development of tight gas reservoirs in northern Hubei Province.</p>

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Study and Application of Reservoir Protection Drilling Technology in Tight Sandstone Gas Reservoir

  • 期刊论文

  • 发表日期：

    2026年2月26日

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  • Mingzhong Li,
  • Jiahua Zhang,
  • Wenyu Song,
  • Weiqiang Song,
  • Shupeng Zhang,
  • Yufeng Lin,
  • Zhicheng Yu

摘要

Due to the low permeability, fine pore-throat structure, well-developed fractures, and high clay mineral content of tight gas reservoirs, it is difficult to effectively prevent and mitigate reservoir damage during drilling, which consequently reduces gas well productivity and increases both well construction investment and subsequent treatment costs. By systematically analyzing the pore-throat structure, mineral composition, and sensitivity characteristics of the reservoir, the key mechanisms of reservoir damage—such as solid-phase plugging, liquid trapping, and fracture-induced lost circulation—are identified. Based on these mechanisms, self-degradable temporary plugging agents, water-blocking (anti-water-locking) agents, and acid-soluble consolidation plugging agents are developed accordingly. On this basis, the corresponding treatment agents are optimized, and a low-damage reservoir-protection drilling fluid system is established. By integrating the low-damage reservoir-protection drilling fluid, acid-soluble consolidation plugging agents, and horizontal well drilling-rate enhancement technology, a complete reservoir-protection drilling fluid and drilling technology system suitable for tight gas reservoirs in northern Hubei Province is formed. Field applications demonstrate that this integrated technology effectively reduces drilling-induced reservoir damage, improves single-well gas production, and enables natural production in some wells. The proposed technology is therefore of great significance for promoting the large-scale, efficient development of tight gas reservoirs in northern Hubei Province.