Products Two-stage cementing collar series Mechanical stage collar
1. Scope
Model DYFZ-A mechanical stage tool is a special tool used to complete the cementing operation in two times. Mainly used in the following circumstances.
1.1. Excessive injection of cement at one shot.
1.2. The formation cannot bear the gigantic fluid pressure.
1.3. Packoff special strata.
1.4. Avoid the occurrence of annual air channeling after the cementing job.
1.5. The considerable temperature difference between the upper and lower section makes it rather difficult to adjust the slurry performance.
1.6. Two-stage cementing for deviated and horizontal wells
2. Structure
Model DYFZ-A mechanical stage tool mainly consists of two-stage coupling (body), shut-off baffle, first-stage plug, Free-fall opening plug and closing plug
1. An anti-rotation device is specially developed to prevent the synchronous rotation of closing sleeve and bits.
2. A particular structure is developed to prevent the possible pre-shutoff of closing sleeve.
3. In the closing sleeve of closed circulation hole, close the locking mechanism to prevent closure put on the back, to achieve permanent closure.
4. All accessories, made from premium quality rubber or aluminum material, have very good anti-rotating mechanism that makes drillout easy.
5. Free-fall opening plug and pumping-down opening plug are available to realize mechanical opening.
6. The ID. of upper/lower sub should be the same as that of casing, but smaller than that of closing sleeve, which protects the closing sleeve from being damaged during tripping and drill out operations.
|
Specifications(in) |
7" |
|
Opening Pressure(Mpa) |
7 |
|
Closing Pressure(Mpa) |
5.5 |
|
Sealing Capacity(Mpa) |
≥25 |
|
Rated Load(t) |
180 |
|
Connection Thread |
API 7" |
|
Max. OD. (mm) |
208 |
|
Drill-out ID. (mm) |
157 |
|
Overall Length (mm) |
990 |
|
Length of first-stage plug (mm) |
320 |
|
Length of closing plug (mm) |
280 |
