Preparation and Application of the Complex Water Plugging Agent GFD-1 on Low Hardness for Sidetracking Well

Cement as the first plugging agent in oilfields is widely used. Aim at these problems that cement particles are small, cohesive time is short and the construction process is difficult to control, cement is formulated with additive for modification in order to make the cohesive time adjusting and easily drilling removal. Meanwhile, the capability evaluation and field application are carried out. The result shows that GFD-1 has the characteristics of low-density, easy drilling, micro expansion and better rheological behaviour, which can protect annular tube and exploit easily in later period. The economic benefits are significant in oil fields development.