渤海油田疏水缔合类堵塞物伤害机理及解堵技术

Damage mechanism and removal technology of hydrophobic associative blockages in Bohai Oilfield

兰夕堂 高尚 张璐 符扬洋 张丽平 刘长龙

LAN Xitang GAO Shang ZHANG Lu FU Yangyang ZHANG Liping LIU Changlong

中海石油(中国)有限公司天津分公司

CNOOC China Limited Tianjin Company, Tianjin 300459, China

针对渤海S油田注聚井进行多次解堵仍达不到油藏配注需求的生产难题，开展了堵塞特点及伤害机理的研究。利用扫描电镜、红外光谱及原子力显微镜等实验仪器对该油田注入过程中形成的疏水缔合类堵塞物与常用聚丙烯酰胺类堵塞物进行了对比研究，发现疏水缔合类堵塞物比常规堵塞物结构更加复杂、包裹油污能力更强，并针对其伤害特点研发出新型SOA解堵剂。通过室内实验发现，新型SOA解堵剂对疏水缔合聚合物类堵塞物降解率达到90%以上，而当SOA与酸组合使用后降解率达到99%以上，由此形成了一套SOA解堵剂与酸交替注入的新工艺。研究成果在S油田完成4井次现场应用，有效率100%，为海上油田注聚井高效解堵提供有效的方法，具有很好的推广应用前景。

The polymer injection wells in Bohai S Oilfield cannot meet the injection allocation demand of the oil reservoirs even though blockage removal is carried out many times. In order to solve this production difficulty, this paper researched the characteristics and damage mechanisms of the blockages. The hydrophobic associative blockages formed in the process of polymer injection in this oilfield were compared with the common polyacrylamide blockages by means of scanning electron microscope (SEM), infrared spectrum, atomic force microscope (AFM) and other experimental instruments. It is shown that compared with conventional blockages, hydrophobic associative blockages are structurally more complicated and have stronger oil fouling enveloping ability. Then, based on their damage characteristics, a new type of SOA blockage removal agent was developed. It is indicated from the laboratory experiments that this new SOA blockage removal agent has the degradation rate of hydrophobic associative blockage over 90% and when it is combined with acid, the degradation rate is as high as 99%. Based on this, a new set of alternating SOA blockage removal agent and acid injection process is formed. The research result has been applied on site four well times in Bohai S Oilfield and its efficiency is 100%. It provides powerful guidance for the efficient blockage removal in polymer injection wells of offshore oilfields and its application and promotion prospect is promising.

10.13639/j.odpt.2021.05.018