Volume 42: Energy Transitions toward Carbon Neutrality: Part V

Proposing a Novel Reusable Fracturing Fluid for Tight Sandstone Fracturing in the Changqing Gas Field: Environmental and Economic Implications Qifan Chang,Lihui Zheng,Naiyuan Zhang,Yi Jin,Qinhao Zhang,Yitian Zhou

Abstract

In the Changqing gas field, fracturing fluid plays a pivotal role in the development of tight sandstone fracturing. However, its extensive usage and single-use nature have led to environmental concerns and resource wastage. Traditional fracturing fluids lack the capability for multiple recycling, underscoring the imperative for a fracturing fluid system that not only meets performance criteria but also facilitates recyclability. This study introduces a fracturing fluid formulated from exopolysaccharides complemented with Carboxymethyl Cellulose and Benzenesulfonicacid, to address this reusability challenge. Experimental evaluations were conducted on both the fresh fracturing fluid prepared with clean water and the reusable fracturing fluid formulated with returned post-fracture fluid. Results indicate that the fluid aligns with the Changqing gas field’s stipulated criteria for apparent viscosity, gel breaking, and reservoir protection. A field trial involving 5,690 m³ of fracturing fluid yielded a recovery of 5,357 m³, translating to a remarkable 94.15% recycling efficiency. The potential for recycling this fluid offers substantial environmental and economic advantages, including water conservation, diminished waste fluid emissions, and the promotion of eco-friendly, sustainable production methodologies.

Keywords Gas wells, Reusable fracturing fluid, Clean and recyclable, Fracturing