In order to strengthen the borehole wall and ensure continued safe drilling, seal off the oil, gas and water layers, ensure layered testing during exploration and reasonable oil and gas production during the entire mining process, and insert high-strength steel into the drilled well. The process of quality casing and filling cement in the annular space of the wellbore and
casing pipe is called cementing operation.
Cementing is a key link in the construction of oil and gas wells. Compared with other drilling processes, cementing operations are obviously special. It is a one-time operation. If the quality is not good, it is difficult to remedy under normal circumstances. It is a concealed operation. The main process is downhole and cannot be directly observed during construction. The quality is often determined by the accuracy of the design and the quality of the preparation work. It is also affected by the combination of multiple factors and also affects the subsequent projects; it is a costly operation and casing costs.It accounts for about 25% of the total drilling cost; it has short construction time, many procedures, and a large amount of work, which is a highly technical operation. Obviously, cementing is an important part of the drilling process. The quality of cementing not only affects whether the well can be drilled, but also whether it can operate normally and safely in the production period of the well.
