关键词: 修井液, 暂堵剂, 漏失, 水溶性, 水解, 降解

Abstract: Leakage of workover fluid often takes place in workover service in China’s eastern oil fields under water-injected development, such as Dagang Oilfield. The temporarily-plugging technology to prevent leakage of workover fluid is far from satisfaction. Therefore, a new-type water-soluble plastic temporarily plugging agent is development for settlement of this problem. This high plastic material is hydrogel that can be degraded in water after 24 to 48 hours. It can rapidly plug the producing zone for the time being. This agent is tested for anti-shearing strength, plugging rate, solubility, degradability and blockage removing property. It is rapidly degradable and soluble in water with little residues and low viscosity. The output can be rapidly restored after workover service. The temperature range of application is between 40°C and 110°C. The agent is also entirely degradable in the environment and free from toxicity, exerting little influence on the environment. It is tested for 144 wells in Dagang Oilfield and achieves good results.

Key words: water-Soluble, plastic, temporarily plugging, agen, application, reparation