摘要
位于塔里木盆地北部的雅克拉—大涝坝凝析气田经过多年的开采,其储层条件发生了很大的变化。由于原修井液体系固相含量较高,致使气井相继出现污染,储层也受到不同程度的损害。针对该气田储层特点,从增黏剂、降滤失剂、抑制剂和对储层孔喉具有暂堵作用的特殊粒子等入手,以生物聚合物、羟乙基聚合物纤维素类为主处理剂,并辅以降滤失剂、油溶性暂堵剂等开展了一系列实验研究,研制出保护储层的新型油溶暂堵型无固相修井液体系。现场试验表明,新型修井液体系性能优良,流变性易于调整和控制,抗高温能力强,API滤失量小于等于8mL且HTHP滤失量很低,岩心渗透率恢复值超过80%,具有明显的储层保护效果。
After many years of development at the Yakela-Dalaoba condensate gas field, the reservoir conditions have changed significantly. The gas wells have been contaminated and the reservoirs are damaged to different degrees due to high solids contents of the previous workover fluid systems. Based on the lithology of the reservoirs, the characteristics of the porosities, the pore throats and the low permeability, a series of experimental studies have been made. First, the thickening additives, filtration-reducing agents, inhibitors and special particles helpful for temporary plugging of reservoir pore throats were investigated, then the biologic polymers and the ethoxyl polymer fibers were taken as the main additives, and the filtration-reducing additives and oil-soluble temporary-plugging additives as the supplementary additives,finally a new type of oil-soluble temporary-plugging non-solids workover fluid system was thus developed, being helpful for reservoir protection. The field application shows this new system has good performance, especially in reservoir protection, which can be shown by the following results: its rheology easy to adjust and manage, a high resistance to high temperature, the API filtration rate ≤8 mL and the HTHP filtration rate very low, and a permeability recovery rate up to over 80%.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2010年第3期77-79,共3页
Natural Gas Industry
基金
国家自然科学基金项目(编号:50574061)
中国石油天然气集团公司重大应用基础研究项目(编号:07A20402)
关键词
深井
油气层
堵漏剂
渗透性损害
无固相修井液
雅克拉-大涝坝凝析气田
deep well, oil/gas formation, plugging agent, permeability damage, non-solids workover fluid, Yakela-Dalaoba condensate gas field, lost circulation, reservoir damage, skin factor
