School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
2 School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley 6009, Australia
Drilling & Production Research Institute, Petro China Jidong Oilfield Company, Tangshan 063000, China
To meet the requirements of leakage stopping and reservoir protection at the same time in fractured formation, the removable plugging slurries with high temperature tolerance were designed, evaluated and applied in the field successfully. Analysis shows that the fibre materials can deposit onto crack surface, bridge and seal fractures quickly and the selected particles can bridge in throat near wellbore. The comprehensive grading of filling particles was determined from the point of view of gradient filling. The designed plugging slurries KJD155 and KJD200 with higher total dissolution rates sealed 1 mm, 2 mm, 3 mm, and 4 mm crack blocks effectively at room temperature and high temperature (KJD155 at
155 °C; KJD200 at 200 °C) respectively. Their pressure bearing ability of them was up to 5 MPa under bottom hole conditions, which was beneficial to the next operation. Field application of the designed plugging slurries was carried out successfully and showed that they were removable and did smaller damage to reservoir.
Keywords: Bearing pressure ability, fractured formation, high temperature tolerance, leak stopping, reservoir protection.
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