Sandstone reservoir water injection well modified depressurization acidification method

• Main Authors: TIAN XIANGLEI, ZHANG DINGYONG, WAN HUIPING, ZHANG SHICHENG, ZHOU YANG, YOU LONGTAN, FENG QINGWEI, ZHANG WEI, ZHANG JIANG, ZHANG XIUSHENG
• Format: Patent
• Language: Chinese; English
• Published: 30.03.2021
• Subjects: ADHESIVES; CHEMISTRY; DYES; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MINING; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PAINTS; POLISHES

The invention relates to the field of oil and gas field development, particularly to a sandstone reservoir water injection well modified depressurization acidification method. According to the modified depressurization acidification method, based on reservoir difference investigation, the injection rate is optimized, the lower PH value of a stratum is kept, precipitation of a soil acid product isinhibited, the swept volume is enlarged, and the effective seepage section of acidification is improved; and based on secondary damage research, an acid using procedure is optimized, secondary blockage is avoided, the utilization rate of acid liquor is increased, the measure cost is reduced, the operation time efficiency is improved, and safe and environment-friendly production is realized. 本发明涉及油气田开发领域，具体涉及一种砂岩储层注水井改性降压酸化的方法。所述改性降压酸化的方法，立足储层差异调查，优化注入速率，保持地层较低PH值，抑制土酸产物沉淀，扩大波及体积，提高酸化有效渗流断面；立足二次伤害研究，优化用酸程序，避免二次堵塞，提高酸液利用率，降低了措施成本，提高了作业时效，实现了安全、环保生产。