1. Brief Introduction
a). Excessive injection of cement at one shot.
b). The formation cannot bear the gigantic fluid pressure.
c). Pack off special strata.
d). Avoid the occurrence of annual air channeling after the cementing job.
e). The considerable temperature difference between the upper and lower section
makes it rather difficult to adjust the slurry performance.
f). Two-stage cementing for deviated and horizontal wells
2. Structure
Model PYZS-A hydraulic stage tool mainly consists of two-stage coupling (body),
shut-off baffle, first-stage plug and closing plug.
3.Product Features
a). Anti rotation device is designed to prevent the synchronous rotation of closing sleeve and bits.
b). A particular structure is developed to prevent the possible pre-shutoff of closing
sleeve.
c). In the closing sleeve of closed circulation hole, close the locking mechanism to
prevent closure put on the back, to achieve permanent closure.
d). All accessories, made of premium quality rubber or aluminum material, have
very good anti-rotating mechanism that makes drill out easily.
e). Free-fall opening plug and pumping-down opening plug are available to achieve
mechanical opening.
f). The I.D. of upper/lower sub should be the same as that of casing, but smaller than
that of closing sleeve, which protects the closing sleeve.
Technical Parameters
| Specification (in) |
72(Φ177.8) |
| Opening Pressure (MPa) |
16~18 |
| Opening Acting Force (KN) |
96~102 |
| Closing Pressure (MPa) |
5 |
| Closing Acting Force (KN) |
97 |
| Sealing Capacity (MPa) |
25 |
| Rated Load (t) |
180 |
| Connection thread |
API 72 BTC |
| Max. OD. (mm) |
208 |
| Drill-out ID. (mm) |
159.4 |
| Overall Length (mm) |
930 |
| Length of first-stage plug (mm) |
320 |
| Length of Closing plug (mm) |
280 |
