摘要
纤维暂堵酸压是针对存在天然裂缝或渗透率差异大的储层转向酸压的一种新工艺,其工艺的核心为暂堵纤维材料。为此,基于纤维暂堵转向原理,在实验分析的基础上,成功研制出了DF新型纤维材料:以有机聚合物为原料、独特工艺制造、并对表面进行特殊工艺处理的高强度有机聚合物可降解的单丝短纤维。理论研究和室内试验结果证明:①DF暂堵纤维能在裂缝或蚓孔处形成致密"滤网结构",增加酸液的流动阻力,达到暂堵和酸液转向的目的;②在清水中有好的分散性能,对酸液体系的原有性能无影响,并具有较好的可流动性;③在施工结束后随着地层温度的恢复,暂堵纤维在残酸中能彻底降解,对储层无污染、无伤害。DF暂堵纤维转向酸压目前已现场应用16口井,施工成功率达100%,其中有效增产井13口,有效率为81.2%,平均有效期超过193 d,增产效果显著。
Fiber temporary plugging and acid fracturing is a novel diverting acid fracturing technology for the reservoirs with natural fractures or large-range permeability and its technical key point lies in temporary plugging fibers. Based on fiber temporary plugging and diverting principles, a new type of DF fiber, the high-intensity degradable organic-polymer filament short fiber was successfully developed after experimental analysis was conducted. It was made of organic polymers with unique techniques and was processed at the surface with special techniques. Based on theoretical analysis and laboratory experiments, DF temporary plugging fiber can form tight ＂screen structures＂ in fractures or worm cavities, so as to increase flow resistance of acid and realize temporary plugging and acid diverting. It is characterized by good dispersibility and mobility in fresh water, so the original properties of acid systems are not influenced. And with the recovery of reservoir temperature after the operation is finished, the temporary plugging fibers in the reac- ted acid are degraded completely, so the reservoirs are not contaminated or damaged. This technology was applied on site in 16 wells with an operation success ratio of 100%. And among them, 13 well were effectively stimulated with a validity percentage of 81.2% and an average duration of validity over 193 days.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2015年第11期54-59,共6页
Natural Gas Industry
基金
国家自然科学基金项目"复杂碳酸盐岩储层酸岩非均相反应动力学规律及多元深度改造方法研究"(编号:51274237)
关键词
纤维暂堵
转向材料
转向机理
转向酸压
碳酸盐岩
储集层
压裂(岩石)
增产
Fibers for temporary plugging
Diverting agent
Diverting mechanism
Diverting acid fracturing
Carbonate rocks
Reservoirs
Fracturing （rocks）
Stimulation
