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<p>Acidification is the key stimulation technology to realize the efficient development of sandstone oil and gas resources. The liquid configuration and transportation are complex in the traditional acidizing operation of sandstone reservoirs. The traditional liquid acid acid-rock reaction is fast, corrosive, easy to damage the reservoir and cumbersome approval. Based on the core idea of ‘solid’ replacing ‘liquid’, combined with the HSE concept, a new solid mud acid system mainly composed of solid organic anhydride (SMA), solid fluorine-containing material (FRC) and solid corrosion inhibitor is developed. It has good retardance, corrosion inhibition and inhibition of secondary precipitation performance. The experimental results show that 17wt% SMA slowly generates acid at high temperature of 120°C, and the acid concentration can reach 11.5wt % HCl in 140 min, which can meet the purpose of deep acidification of sandstone reservoirs. The new solid mud acid system can control the multi-stage stepwise ionization of H+, and complex metal ions through proton exchange and complexation effects, effectively avoiding secondary precipitation. The new solid mud acid system has good stimulation ability, the permeability is increased by 2.7 times. By reacting with sandstone minerals to generate dissolution pores, it communicates with the original independent dissolution pores, achieving the result of “expanding holes and increasing permeability”. This study verifies the effectiveness of the new solid mud acid system in acidizing sandstone reservoirs, providing scientific reference for sandstone reservoirs stimulation.</p>

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A Safe and Environmental-Friendly Solid Mud Acid with Retarding Performance, and Low Corrosion for Sandstone Reservoir Acidification

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Yan Gao,
  • Hongzhong Zhang,
  • Congming Huang,
  • Yujie Huang,
  • Pingli Liu,
  • Yaoshun Yuan

摘要

Acidification is the key stimulation technology to realize the efficient development of sandstone oil and gas resources. The liquid configuration and transportation are complex in the traditional acidizing operation of sandstone reservoirs. The traditional liquid acid acid-rock reaction is fast, corrosive, easy to damage the reservoir and cumbersome approval. Based on the core idea of ‘solid’ replacing ‘liquid’, combined with the HSE concept, a new solid mud acid system mainly composed of solid organic anhydride (SMA), solid fluorine-containing material (FRC) and solid corrosion inhibitor is developed. It has good retardance, corrosion inhibition and inhibition of secondary precipitation performance. The experimental results show that 17wt% SMA slowly generates acid at high temperature of 120°C, and the acid concentration can reach 11.5wt % HCl in 140 min, which can meet the purpose of deep acidification of sandstone reservoirs. The new solid mud acid system can control the multi-stage stepwise ionization of H+, and complex metal ions through proton exchange and complexation effects, effectively avoiding secondary precipitation. The new solid mud acid system has good stimulation ability, the permeability is increased by 2.7 times. By reacting with sandstone minerals to generate dissolution pores, it communicates with the original independent dissolution pores, achieving the result of “expanding holes and increasing permeability”. This study verifies the effectiveness of the new solid mud acid system in acidizing sandstone reservoirs, providing scientific reference for sandstone reservoirs stimulation.