A casing buoyancy system is designed to help minimize the drag on the rig, which is an important feature for offshore operations. The technology is available as a kit or separately, and combines a liner and floats to create a single unit. By increasing the buoyancy of the liner, this system can decrease trip time and increase drilling efficiency.
Casing buoyancy system can also help operators reduce the weight of the hookload. These systems clamp onto a drill pipe tube and reduce the overall weight of the landing string. They are an excellent option for rigs that have trouble hoisting and moving heavy casing. While they can’t replace traditional tieback systems, these systems can improve drilling efficiency and lower drilling costs.
NCSM’s technology is backed by patents. The company holds 11 U.S. patents and 17 related international patents. The company’s patents cover a wide range of topics, including airlock casing buoyancy systems, oil-soluble tracers, casing installed sliding sleeves, and frac isolation assemblies. The patents expire between 2030 and 2035.
The casing buoyancy sub system includes several components: a float shoe, a float collar, and a check valve. These components prevent fluid from entering the casing and also reduce drag during installation. The float shoe also contains a releasable plug that blocks a passageway in the insert’s body. Air is also stored in this plug.
The FloatCure system can be used with any type of liner hanger system. The choice of liner hanger system will depend on the specific requirements. However, the FloatCure system provides several key benefits, including reducing net effective weight, reducing the need for cementing procedures, and maintaining the pump-through capability of the casing/liner system. It also improves stand-off and cement placement.
Casing buoyancy systems can also include glass or ceramic barriers. However, a glass barrier requires a high pressure rating and appropriate geometry. It is very difficult to engineer glass products. For this reason, some operators have preferred ceramic flotation subs while others continue to use casing buoyancy systems with glass barriers.
A buoyancy system can also reduce the weight of a drill string’s landing string. It can also provide uplift force and help reduce the overall hookload of a drill pipe landing string. The Archimedes’ principle states that an object immersed in a fluid loses weight proportional to the weight of the fluid. See more about buoyancy at https://www.youtube.com/watch?v=r_lrR_Y4_UM.