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Li H.,Yanjiao Development Zone | Xiang X.,Yanjiao Development Zone | Zhang H.,Yanjiao Development Zone | Fu J.,Yanjiao Development Zone | Zhao H.,Yanjiao Development Zone
Drilling Fluid and Completion Fluid | Year: 2015

Two optimized cement slurries are designed to deal with sustained casing pressure problem in cementing shallow gas zones in Bohai, with the first one prepared with expanding material and plasticization agent, the second one with self-healing material. When expanding material and fibers are added into a cement slurry, the 96-hour cement strength of the slurry is increased only by 15%, which means that the anti-channeling capacity of the cement slurry will not be improved notably. When seal-healing material is added into the cement slurry, the sealing efficiency of the set cement reaches 95%, or even higher. It is thus believed that cement slurries treated with self-healing material satisfy the need for well cementing, and this is also proved by field practices. ©, 2015, North China Petroleum Administration Drilling Technology Research Institute. All right reserved.

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