Float Collar
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![]() | Float Collar |
![]() | land and offshore wells |
- Description
- Specifications
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Float collar is a casing coupling with a check valve. It is one of the casing accessories. In deep wells and special wells, it can be combined with casing floating shoes to improve the safety of cement injection operations.
In the process of casing running, a one-way flow of drilling fluid in the annulus is realized to prevent the backflow of cement slurry during cement injection and to realize pressure relief and setting after cementing impact, which helps to improve the cementing quality of the cement ring and casing;
at the same time, the buoyancy of the casing string is adjusted by pouring drilling fluid which is run into the casing string, so that the casing hanging weight can meet the design requirements of the casing operation.
When using the casing float collar, it is to control the lowering speed of the casing string to prevent the pressure variation caused by the rapid lowering, which may cause seal failure or crush the fragile formation.
By pouring drilling fluid into the casing and adjusting the pressure difference between the inside and outside of the casing, it can effectively prevent the casing from being crushed.
A float collar is a critical component used in oil and gas drilling operations, specifically in the casing process.
It is a specialized device installed in the casing string to prevent backflow of drilling fluids during the cementing phase.
Typically located near the bottom of the casing, the float collar contains one or more check valves that allow cement to flow into the annulus (the space between the casing and the wellbore) while preventing the return of fluids to the wellbore once the cement is pumped.
The primary function of the float collar is to ensure that the cement sets properly, creating a strong bond between the casing and the formation, which is essential for well integrity and pressure containment.
By preventing backflow, it helps to avoid contamination of the cement and ensures that the casing is adequately supported.
Manufacturers produce float collars to meet various specifications, including those set by the American Petroleum Institute (API).
They are designed to withstand high pressure and temperature conditions in the wellbore.
Proper installation and selection of a float collar are crucial for the success of the cementing operation, ultimately impacting the overall performance and safety of the well throughout its lifecycle.
Float Collar Parameter | ||||||||
Specs(mm)/(in) | OD(mm) | ID(mm) | Height(mm) | Open Hole (mm) | Thread Connection | Pressure (MPa) | Unit Weight (KG) | |
140 | 5 1-2 | 160 | 127.3-118.6 | 500 | 45 | API Thread/ Premium Thread | 35 | 38 |
168 | 6 5-8 | 187.8 | 153.6-144.1 | 550 | 45 | API Thread/ Premium Thread | 35 | 42 |
178 | 7 | 200 | 166-150.4 | 550 | 45 | API Thread/ Premium Thread | 35 | 56 |
194 | 7 5-8 | 219.1 | 178.4-162 | 550 | 45 | API Thread/ Premium Thread | 35 | 64 |
219 | 8 5-8 | 244.5 | 205.6-190.8 | 550 | 45 | API Thread/ Premium Thread | 35 | 72 |
244 | 9 5-8 | 269.7 | 226.6-214.3 | 550 | 70 | API Thread/ Premium Thread | 35 | 78 |
273 | 10 3-4 | 298 | 258.9-242.8 | 550 | 70 | API Thread/ Premium Thread | 35 | 98 |
298 | 11 3-4 | 323.9 | 281.5-273.6 | 600 | 70 | API Thread/ Premium Thread | 35 | 120 |
340 | 13 3-8 | 365 | 320.4-313.6 | 600 | 70 | API Thread/ Premium Thread | 35 | 148 |
406 | 16 | 431.8 | 384.1-381.3 | 650 | 70 | API Thread/ Premium Thread | 21 | 182 |
473 | 18 5-8 | 508 | 450.9 | 650 | 70 | API Thread/ Premium Thread | 21 | 230 |
508 | 20 | 531.2 | 485.7-475.7 | 650 | 70 | API Thread/ Premium Thread | 21 | 312 |
You also could customize the size and specs and, then we could design and manufacture them accordingly. |