1)The casing centralizer is basically in a folded state when it is put into the well,and its initial outside diameter is small,which reduces the risk of stuck well.
2)Prohibit downhole pressure opening.The opening pressure is only related to the differential pressure between the annulus inside and outside the wellbore.Hydraulic shear pin is opened underground,high reliability.
3)The elastic centralizer is made of spring steel with large deformation,large expansion diameter and large support force after expansion.
4)After opening,it has locking function,can stop before and after in time,and can adapt to different degrees of reaming.
The application of casing centralizer is as follows:in the process of cementing in oil and gas Wells,the degree of casing pair has great influence on cementing quality.The role of the casing centralizer is to centralize the casing as much as possible during cementing,thus improving the cementing quality.Because directional and horizontal Wells are widely used in oil and gas reservoir development,there are many problems in the application of traditional rigid and elastic casing centralizer.
First,traditional rigid casing centralizers have large and constant outside diameters,which makes them difficult to run,especially in highly deviated and horizontal Wells.
Second,the traditional elastic centralizer is full of holes due to its initial state.When running in,the elastic parts friction with the shaft wall,elastic parts are easy to wear.