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The petroleum industry is increasingly focused on high-temperature, high-pressure oil reservoirs, and they face challenge in generating sufficient surface construction pressure without exceeding the capabilities of surface equipment. To address this issue, the industry now predominantly relies on weighted fracturing fluid. However, weighted fracturing fluid is unreasonably expensive and difficult to break up. Thus, researchers are urged to develop a low-cost, weighted fracturing fluid that can be easily fractured. Thus, polymer thickener GTA, with poly-hydroxy groups capable of complexing calcium ions, and boron–zirconium composite crosslinker JL903, which is capable of delaying crosslinking, were developed. A CaCl 2 -weighted fracturing fluid system was developed using the polymer and crosslinker. The density of the system can reach 1.28 g/cm 3 , crosslinking time can be delayed by 5 min, and the temperature resistance can reach 140 °C. Following the use of ammonium persulfate as a gel breaker, sodium bromate was used as a discriminative gel breaker to resolve the issue of excessive residue content in the weighted fracturing fluid.

One practical CaCl 2 -weighted fracturing fluid for high-temperature and high-pressure reservoir