I. overview

Cementing operation is not only related to the successful completion of oil and gas wells, but also affects the quality of oil and gas wells, the life span of oil and gas wells and the production of oil and gas wells after putting into production. Moreover, its cost also plays an increasingly important role in the whole drilling project. At present, it accounts for 20% - 30%. The development goal of cementing technology has been focused on how to further improve the cementing quality and reduce cementing accidents That's ok.

• Cementing is also a system engineering, with complex and diverse influencing factors and its particularity, which is mainly manifested in the following aspects:
• Cementing operation is a one-time project. If the quality is unqualified, even if the remedial methods such as squeezing cement are used, it is difficult to achieve good results.
• Cementing operation is a systematic and concealed operation, involving materials, fluids, chemistry, machinery, mechanics and other disciplines. During construction, there are many unknown factors and great risks.
• Cementing operation is characterized by short construction time, large workload, strong technicality and high cost.