On September 3, the new technical data of the first liquid nitrogen foam fracturing process in Changqing Sulige Gas Field showed that the flow rate reached 429200 m3/day, which saved 50% of the water consumption compared with the conventional fracturing process, reduced the risk of safety and environmental protection operations, and improved the gas testing effect by more than 20%.
Fracturing technology plays a leading role in gas field development. The 3.5-inch bridge coupling technology is adopted for this well, and liquid nitrogen is excited into foam and fully mixed with fracturing fluid through the foam generator to form foam phase fluid that can carry sand stably. During construction operations, the maximum liquid nitrogen displacement and maximum sand concentration are more than twice the efficiency of conventional fracturing processes. The optimized proppant can maximize the support of crack morphology and improve the drainage capacity. After fracturing, nitrogen gas undergoes gasification and expansion under high temperature conditions at the bottom of the well, which can effectively supplement formation energy and achieve efficient fracturing backflow. Compared with conventional processes, the flowback efficiency is increased by more than 50%, reducing the damage of fracturing fluid to gas field reservoirs.
Liquid nitrogen foam fracturing technology was adopted for the first sidetracking well, and remarkable results were achieved. Liquid nitrogen foam fracturing has achieved the remarkable effects of low fluid consumption, high sand ratio, fast flowback and early gas breakthrough, improved the permeability of tight gas reservoir, significantly increased production and efficiency, and helped the overall improvement of the gas field and the construction pace of continuous and stable production. At the same time, it provides valuable construction experience and technical parameters for implementing similar well operations, and provides a demonstration and leading role in improving the development effect of similar gas reservoirs in China. It has strategic significance for further exploring the effective development of tight gas resources.
Post time: Sep-21-2023