| Abstract:Abtract: The Permian igneous strata of Shunbei oil and gas field has the following characteristics: fragmentation, fracture development, pressure sensitivity, burial depth of more than 4445m, thickness of more than 548mm, and serious leakage during drilling. Technologies such as cement, chemical consolidation, high filtration, chemical gel, bridge plugging and plugging slurry drilling have been applied since the exploration and development in 2013. the leakage causes are clarified by analyzing the characteristics of Permian igneous rock strata. The plugging technology applicable to different leakage is clarified through the evaluation of the applied plugging technology and combined with the early application of plugging technology,. Finally four plugging technologies for different leakage layers are determined, such as bridge plugging of small and medium fractures, plugging slurry drilling of multi fracture leakage layers, and chemical consolidation or high filtration plugging of large fractures. Through popularization and application, the plugging time and leakage amount of Permian igneous rock formation in No. 1 fault zone and No. 5 fault zone of Shunbei oil and gas field have been significantly controlled, the leakage amount has been reduced by 87.2%, and the plugging time has been shortened by 92.9%. |