Funct. Mater. 2024; 31 (1): 76-84.

doi:https://doi.org/10.15407/fm31.01.76

Study on a chelating removal system for dissolving barite mud cake

Zhao Huang 1, Yan-fei Li 1, Ming-biao Xu 2, Wei Huang 1, Da-long Feng 1, Xing-bin Zhao 1

1Shanghai Branch of CNOOC, Shanghai, 200335 China
2School of Petroleum Engineering, Yangtze University, Wuhan, 430100 China

Abstract: 

To reduce drilling fluid damage, an oligomeric chelating agent DTPA-J was obtained by modifying DTPA with 1,3-dichloropropane to improve the solubility of barite, which was a non-toxic reagent and met environmental requirements. DTPA-J was chosen for the system of removal of chelating substances from the point of view of its corrosion, biotoxicity and dissolution of barite. The system consisted of a catalyst, a transforming agent and a glue breaker, which had a high efficiency of dissolving barite mud cake in a water-based drilling fluid, and the rate of weight loss of the mud cake exceeded 90%. In addition, the chelation removal system dissolved the additives pressed into the pores of the core, which can significantly improve the efficiency of restoring the permeability of the contaminated core. The application of the chelation removal system is of great importance for reservoir protection and subsequent oil and gas production, which can reduce requirements for the effectiveness of reservoir protection with water-based drilling fluids.

Keywords: 
Mud cake; Barite; Blocking remover; Reservoir protection; Glue breaker; Water-soluble polymer; Water-based drilling fluids.

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