Blockage Creation in Polymer Injection Wells and Chemical Ways of Blockage Removal: A Review
Blockage Creation in Polymer Injection Wells and Chemical Ways of Blockage Removal: A Review
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作者：
Zhang Guang
结合近十年来发表的33篇论文的数据，从堵塞物质的成分分析、堵塞的成因及机理、化学解堵方法等3个方面对注聚井的堵塞产生及解堵技术进行了综述。分析结果表明，现场的堵塞样品均为无机物与有机物的混合物。 注聚井地层问题主要表现在聚合物的吸附和滞留、聚合物摩尔质量与储集层孔喉大小不相容、地层细粒运移、细菌菌群和代谢产物、无机物引发的聚合物团簇、聚合物溶液制备和稀释程序不完善等6个方面。在解堵技术方面，7 聚合物特别是胶凝或胶凝聚合物注入井解堵剂，包括ClO2基、除ClO2以外的强氧化剂、不含强氧化剂，以及大量注入井储层解堵现场案例5例。
The blockage creation in polymer injection wells and the blockage removal technologies are reviewed on the data published in 33 papers in recent ten years in 3 topics: composition analyses of blockage substances;origination and mechanisms of blockage formation,and chemical ways of blockage removal.The results of analyses indicate that the field blockages samples are all mixtures of inorganic and organic substances.The origination and mechanisms of blockage formation in polymer injection wells are presented in 6 aspects: adsorption and retention of polymers;imcompatibility of polymer molar mass with reservoir pore throat size;formation fines migration;bacterial flora and metabolite;polymer clusters initiated by inorganics;and inadequate procedures of polymer solution preparation and thinning.As to blockage removing technologies,7 blockage removing agents for polymer and,particularly,gelling or gelled polymer injection wells,including ClO2 based,based on strong oxidant other than ClO2,and containing no strong oxidant,and 5 field cases of reservoir blockage removal in lots of injection wells.