中国海相碳酸盐岩储层酸化压裂改造技术现状及发展趋势

Overview and Trend of Acid-Fracturing Technology for Marine Carbonate Reservoirs in China

中国海相碳酸盐岩储层具有埋藏深、温度高、高含硫、孔缝洞发育分布不均匀等特点,酸化压裂改造面临一系列技术难题。在对典型海相碳酸盐岩储层地质特征对比分析的基础上,针对酸化压裂改造面临的技术挑战,从高温深井提高酸液有效作用距离的酸液体系、高闭合应力储层提高酸蚀裂缝导流能力的措施、缝洞型储层酸化降滤失措施、复杂地层流体应对技术、复杂结构井分段改造措施等方面对中国海相碳酸盐岩储层酸化压裂改造关键技术现状进行了综合分析,提出了海相碳酸盐岩层增产改造理论及工艺技术发展趋势。该研究结果为海相碳酸盐岩储层增产改造技术的发展提供了技术和理论支持。

The marine carbonate reservoirs in China are characterized by deep burial depth,high temperature,high sulfur content,well-development and complex distribution of pore-fracture-cave,which leads to a series of technical challenges for acid fracturing. The technical challenges of acid fracturing were comprehensively analyzed based on the comparative analysis of typical marine carbonate reservoir geology. The acid-fracturing technology overview for the marine carbonate reservoirs in China was illustrated from several aspects,including high-temperature deep well acid system to enhance operating distance,treatment to improve acid-etched fracture conductivity in high closure-stress reservoirs,filtration reduction measures for fracture-cave reservoir acidizing,complex formation fluid response technology,multi-stage stimulation of wells with complex wellbore configuration,etc. It is proposed the stimulation theory and technology development trend for marine carbonate reservoirs. This research could provide certain technical and theoretical support for the development of marine carbonate reservoir simulation technology.