There are several cementing equipment types that are used while drilling oil, gas, or water wells. The casing will be installed at various depths while drilling. It is usually held in place by cement which also provides zone isolation. The casing is run to protect the wellbore from fluids, pressures, and wellbore stability problems.
There is various downhole equipment such as centralizers and turbolizers and they are used to ensure satisfactory zone isolation.
Centralizers, Turbolizers, and Scratchers
The devices with hinged collars and bow springs keep the casing or liner in the centre of a wellbore. It helps in ensuring efficient placement of a cement sheath around the casing string. In case the casing strings are cemented off-centre, there is a risk that drilling fluid will be left where the casing contacts create an imperfect seal.
The turbolizers have added fins for drilling fluid and cement to keep the flow steady to make sure the cement flows around the casing to prevent channelling.
There are four types of centralizers such as bow-spring, rigid, semi-rigid, and mould-on. The bow-spring consist of ease in the passageway through narrow hole sections. The rigid centralizers are made up of solid steel bars or cast iron with a fixed blade height. They are sized so that they can fit a specific casing or hole sizes. Semi-rigid centralizers are composed of double-crested bows, which provide restoring forces that are generally in API specifications.
Afloat shoe, having a rounded profile is attached to the bottom of the casing string and it prevents reverse flow. It also guides the casing towards the centre of the hole to minimize washouts in the casing. The outer portion of float shoe is made up of steel and matches the casing size and threads. The inside is made up of cement or thermoplastic since the material is drilled out and it requires deepening beyond the casing point.
Float Collar is installed near the casing string and cement plugs land on it during the primary cementing operation. It helps in retaining the inside casing that has become contaminated. It is quite similar to float shoe and both are used for redundancy.
The check valve assembly fixed within a float collar prevents the flow back of cement slurry when pumping is stopped. The above type should help you in choosing the different cementing equipment types. There are several cementing equipment companies who manufacture different cementing equipment types.