钻井液与完井液2018，Vol.35Issue(2)：116-121,6.DOI:10.3969/j.issn.1001-5620.2018.02.019
非酸解堵技术在渤海油田的应用
Application of Non-acid Block Removing Technology in Bohai Oilfield
摘要
Abstract
A non-acid block removing fluid has been developed to deal with several problems encountered in the development of unconsolidated sandstone reservoirs in Bohai oilfield. The problems include failure of rock matrices in conventional acidizing job, secondary precipitation caused by residue acids that are unable to timely flow back because of the limits from configuration of pipe string and workover jobs, and flowback fluids with high electric conductivity that cannot be directly disposed of. All these problems pose serious restrictions on reservoir acidizing operations. The newly developed non-acid block removing fluid is also able to protect the reservoir from being damaged. The residue of this non-acid block removing fluid has lower electric conductivity. The non-acid block removing fluid, containing 20％ compound polycarboxylic chelating agent A and 5％ fluorine complex C, can slowly release H+ and F-, and maintain its pH value between 6 and 7, showing high retarding property and capability of protecting rock matrices. By chelating metallic ions, scales are prohibited and secondary precipitation is minimized. The non-acid block removing fluid has low corrosivity, and the flowback fluid has low ionic concentrations and electric conductivity, which are beneficial to the on-the-spot and efficient disposal of the flowback residue acid in the platform process. This non-acid block removing fluid has been tried out in Bohai oilfield with remarkable efficiency, showing good application prospect.关键词
油井酸化/缓速溶蚀/二次沉淀/反应残液/电导率Key words
Oil well acidizing/Unconsolidated sandstone/Retarding/Secondary precipitation/Electric conductivity/Offshore drilling分类
能源科技引用本文复制引用
张丽平,张璐,兰夕堂,刘长龙,邹剑,高尚..非酸解堵技术在渤海油田的应用[J].钻井液与完井液,2018,35(2):116-121,6.基金项目
国家重大专项课题"渤海油田高效采油工程及配套技术示范"(2016ZX05058003). （2016ZX05058003）
