裂缝性碳酸盐岩储层堵漏用可降解凝胶暂堵剂研究OA

In order to improve the drilling efficiency of fractured carbonate reservoir,the leakage damage of on-site drilling fluid and plugging slurry was simulated and evaluated.A degradable gel temporary plugging agent JZD-1 was prepared with acrylamide AM and crosslinker JZ-1 for hydrogel as raw materials.Its temperature resistance,degradability,reservoir protection and pressure plugging performance were evaluated in laboratory,and it was applied in the field.The results indicate that on-site drilling fluid and plugging slurry cannot effectively seal large-sized cracks(2.0～3.0 mm),and there is a high risk of leakage.The degradable gel temporary plugging agent JZD-1 has good temperature resistance,degradation performance and reservoir protection performance,which can meet the requirements of plugging construction for fractured carbonate reservoirs on the basic performance of plugging materials.In addition,the degradable gel temporary plugging agent JZD-1 also has good pressure plugging performance.When its mass fraction is 2.0％,it can effectively reduce the leakage of fractures of different sizes,and the pressure bearing capacity is above 10 MPa.The field application result of XJ-12 well shows that the degradable gel temporary plugging agent JZD-1 has good plugging effect on the lost circulation section,effectively controls the loss of drilling fluid,and achieves good field application effect.