Reservoir Evaluation and Development ›› 2018, Vol. 8 ›› Issue (6): 57-61.

• Petroleum Engineering • Previous Articles     Next Articles

Research on indoor experiment of film formation and plugging technology

Wu Ruoning,Xiong Hanqiao,Su Xiaoming,Zhu Jie,Sun Yunchang,Wang Qiren   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2017-11-23 Online:2018-12-26 Published:2018-12-13


During the drilling process in complex sections of the formation, due to the leakage of the drilling fluid, the borehole instability occurs easily. In view of this situation, we put forward the film formation and plugging project of the drilling fluid. In the indoor experiment, the microstructure of the mud cake was analyzed by scanning electron microscopy(SEM). The hydration resistance of the plugging film was evaluated by the water permeation tests. The improved sand bed experiment had simulated the plugging performance of the drilling fluid on the formations with different permeability. Then, we analysed the positive pressure capacity and flowback effect of the plugging film by the self-designed unconsolidated sand core flow experiments. The experimental results showed that the film-formation drilling fluid was resistant to the highest temperature of 150 ℃, and the mud cake formed by API leak-off was denser. In the same period, the water permeability of the mud cake remained unchanged and the plugging film had certain hydration resistance. When the dosage was between 2 % ~ 3 %, the sand beds with different mesh were totally blocked, without the leak-off of the drilling fluid, and the positive pressure value was high after the plugging film formed, which could reach 16 MPa. In the reverse driving, the breakthrough pressure was between 0.5 ~ 1 MPa with good flowback effect.

Key words: leakage, film formation and plugging, plugging film, hydration resistance, leak-off

CLC Number: 

  • TE254