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Leak-proof and plugging cement slurry system
Summary：The leak-proof and plugging effect of the leak-proof cement slurry system is based on the principle of mutual filling of solid particles of different sizes and different types of fibers in the leak-proof fiber. When the cement slurry enters the leakage layer, it can form a "filter structure" to increase the flow resistance of the cement slurry. With the help of the hydration and gelation of the cement slurry and the filling of cement particles, the leakage plugging and the bearing capacity of the formation can be improved. There are two types of plugging fibers currently used, one is glass fiber and the other is polymer fiber.
The leak-proof and plugging effect of the leak-proof cement slurry system is based on the principle of mutual filling of solid particles of different sizes and different types of fibers in the leak-proof fiber. When the cement slurry enters the leakage layer, it can form a "filter structure" to increase the flow resistance of the cement slurry. With the help of the hydration and gelation of the cement slurry and the filling of cement particles, the leakage plugging and the bearing capacity of the formation can be improved. There are two types of plugging fibers currently used, one is glass fiber and the other is polymer fiber. The size of the fibers is generally determined by the minimum clearance through which the cement slurry passes. The plugging fiber does not aggregate into groups in the slurry body, is easy to disperse, does not block the pipeline and casing string during the construction process, and has no obvious effect on the rheological properties of the cement slurry. Plugging fiber can significantly improve the toughness of cement stone.
Since the first use of leak-proof and leak-proof fiber cement slurry in the 177.8mm suspension (1703.70-5060.11m) cementing lead slurry of Well Dawan 2 on October 28, 2006, leak-proof and leak-proof cement slurry has been used for 48 well cementing. The qualified rate is 97.92 (one well Yuanlu 17, 146.1mm suspension cementing is unqualified because there is an active gas layer under the leakage layer), and the excellent rate is 56.25.
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