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China Surfactant Detergent & Cosmetics ›› 2025, Vol. 55 ›› Issue (3): 279-285.doi: 10.3969/j.issn.2097-2806.2025.03.002

• Invited paper • Previous Articles     Next Articles

Synthesis and crosslinking properties of W-SN crosslinking agent

Haibing Cheng1,Yong Zhang1,2,Lei Sun1,Weijia Li1,Zhi Chen1,*(),Congming Tang1,Li Chang1   

  1. 1. College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
    2. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2024-11-09 Online:2025-03-22 Published:2025-04-01
  • Contact: *E-mail: z.chen@cqut.edu.cn.

Abstract:

Fracturing is an important stimulation means for low-permeability oil reservoirs to increase their productivity. The normal operation of hydraulic fracturing largely depends on whether the fracturing fluid has excellent heat and shear resistance which in turn depends on the crosslinking agent. In this work, melamine, sodium tetraborate, and zirconium oxychloride were used as raw materials to synthesize a new W-SN crosslinking agent through “one-step method”. Under laboratory conditions, the performance of the fracturing fluid used with this crosslinking agent was evaluated. By study of the preparation process of W-SN crosslinking agent, the optimized synthesis conditions were obtained as follows: 5wt% zirconium oxychloride, 1wt% melamine, 2.5wt% sodium tetraborate, pH of 0.5, temperature of 90 ℃, and reaction time of 4 hours. The optimized conditions for gelation with partially hydrolyzed polyacrylamide (HPAM) were as follows: crosslinking time, 25 minutes; mass ratio of HPAM to W-SN, 100∶2.5. Both W-SN crosslinker and the HPAM gel show improved salt tolerance and thermal stability, satisfying the practical requirements of hydraulic fracturing operation.

Key words: fracturing fluid, organic boron zirconium crosslinking agent, thermal stability and shear resistance, synthesis

CLC Number: 

  • TQ423