Research and Application of Chelating Acid Blocking Removal System for Injection Wells

doi:10.11885/j.issn.1674-5086.2019.08.18.01

Abstract

Abstract: Aiming at the problem of rock skeleton loosening caused by acidification with conventional fluorinated acid fluid system in offshore unconsolidated sandstone reservoirs, and containing the characteristics of acidification of immobile string in offshore oilfield injection wells and direct conversion of residual acid to normal water injection after acidification, a chelating acid blocking removal system with low corrosion and precipitation under surface conditions is developed. Taking the injection well in Block X of Bohai Oilfield as an example, the causes of poor injection capacity and the effect of plugging removal are analyzed. The results show that the chelating acid blocking removal system has good retardation, corrosion inhibition, scale inhibition, and medium corrosion ability. It can effectively increase the acid action distance, ensure the safety of water injection pipe string, avoid causing rock skeleton loosening and restrain secondary and tertiary precipitation, and effectively relieve the damage of inorganic substances and polymers. The main reasons for poor injection capacity in Block X are the formation plugging by multi-component complex formed by hydration expansion of clay minerals, particle migration, suspended particles, scaling and polymer. The apparent water absorption index of single well increased by more than 65.4% in field application, and the chelating acid blocking removal effect was remarkable, which could be popularized and applied in similar oilfields.

Key words: unconsolidated sandstone, water injection wells, chelating acid blocking removal system, reservoir damage, application

CLC Number:

TE355

ZHAO Liqiang, CHEN Xiang, SHAN Jincheng, LIU Pingli, LIU Changlong. Research and Application of Chelating Acid Blocking Removal System for Injection Wells[J]. 西南石油大学学报(自然科学版), 2020, 42(3): 123-131.

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