Description:The present invention related to “Replacement of Check Valve by Valvular Conduit in Float Collar”
A Float Collar is a critical component used in the casing string of an oil and gas well. It is installed near the bottom of the casing string and serves multiple functions during cementing operations. The conventional Float Collar contains a one-way check valve that prevents cement slurry from flowing back into the casing after it has been pumped into the annulus. By replacing the check valve with valvular conduit, it will eliminate the dependency on moving parts of check valve during cementing operation and by basic nature of valvular conduit it will eliminate the u-tube possibility or minimize it to very miniscule levels. Float Collars with inbuilt valvular conduit can be deployed in oil/gas well for cementing operation. Valvular Conduit acts as a passive check Valve/Non-Return Valve. It also has no moving parts. Thus, with the usage of valvular conduit all problems associated with the current conventional design will be completely eliminated.
Background of the Invention
A float collar is a vital component in oil and gas well construction, particularly in the casing and cementing process. It plays a crucial role in ensuring well integrity by preventing backflow of cement slurry and maintaining hydrostatic pressure balance. However, like any mechanical component, it is susceptible to failures, especially those related to its check valve mechanism.

Conventionally, The float collar is typically installed near the bottom of the casing string, just above the float shoe. It consists of a one-way check valve that allows fluids to flow downward but prevents upward movement. The check valve prevents cement slurry from flowing back into the casing once it is pumped into the annulus, ensuring proper cement placement. The bottom plug and top plug used in cementing operations land on the float collar, ensuring separation between drilling mud and cement. The check valve helps maintain downhole pressure, assisting in displacement of cement and preventing unwanted fluid migration.
Despite its benefits, the float collar can encounter several operational issues, primarily due to check valve failure. Cement slurry or drilling fluids may flow back into the casing, leading to improper cement placement and well integrity issues. Another cause of the failure of the conventional Float Collars is High differential pressure across the check valve due to rapid fluid displacement or improper cement density leading to damage to the check valve, leading to its inability to seal effectively.
Float collars play a crucial role in the success of well cementing operations, ensuring proper zonal isolation and well integrity. However, their efficiency depends largely on the reliability of the check valve.

The main objective of the present invention is to replace the check valve with valvular conduit, it will eliminate the dependency on moving parts of check valve during cementing operation and by basic nature of valvular conduit it will eliminate the u-tube possibility or minimize it to very miniscule levels. Float Collars with inbuilt valvular conduit can be deployed in oil/gas well for cementing operation. Valvular Conduit acts as a passive check Valve/Non-Return Valve. It also has no moving parts. Thus, with the usage of valvular conduit all problems associated with the current conventional design will be completely eliminated.

Details of the Invention
The present invention relates to Float Collars (FC) which are mandatorily part of each and every oil/gas wells. Float Collar is an equipment which is deployed closer to the bottom of the casing. Cement Plugs land on the Float Collar during the cementing operation. Float Collar outer body is of the size of respective casing and a “Check Valve” is installed inside the body and cement is poured in the surroundings of the check valve. The check valve as the name suggests allows one side flow of the fluid/cement and restricts the back flow of the cement slurry when applied pressure is removed or cement pump is stopped from the surface. In absence of the check valve or due malfunctioning of check valve (when it’s stuck in open position), the cement slurry pumped in the annulus is likely to have u-tube action and will flow back into the casing. This can cause severe well damages and will result in failed cementing operation. The moving parts in Check Valve frequently causes field failures when check valve does not open or after the cementing operation, the check valve does not come its original position i.e. remains in open position. These failures can damage an entire section of the oil/gas well or sometime the loss of entire well causing significant financial losses to and Exploration & Production company.

Referring to figure 1 which is illustrating float collar with conventional valve. The figure 2 represents the patented Float Collar with Valvular Conduit. The figure 3 refers the functioning of the valvular conduit operations.
, C , Claims:Accordingly the present invention Replacement of Check Valve by Valvular Conduit in Float Collar comprises:
1. Invented Replacement of Check Valve by Valvular Conduit in Float Collar completely eliminates the problems associated with current conventional Float Collars.
2. Invented replacement of Check Valve by Valvular Conduit in Float Collar as claimed in claim 1 where the valvular conduit does not contain moving parts and thus it does not get jammed inside the well.