DP-60 and DP-73 differenal subs are used for underbalance perforaon and sealing of the tubing cavity during run-in-hole operaons.
The sub contains a membrane made of high-tenacity ceramics. There are circulaon holes under the membrane in the sub body. Aer the membrane is broken by a drop bar, the holes provide free circulaon between tubing and casing annulus. The subs are used together with ISKRA-M, ISKRA 86-MS, VGM73 and ISKRA 89-D mechanical and hydro-mechanical firing heads.
| Parameter | Value | |
|---|---|---|
| DP-60 | DP-73 | |
| Tubing type for differenal sub run-in-hole | Tubing 60 | Tubing 73 |
| Max differenal underbalanced pressure, MPa | 70 * | 70 * |
| Max temperature at the operaonal interval, °C | 150 | 150 |
| Dri diameter, mm | 50 | 62 |
| Total area of circulaon holes, mm2 | 2035 | 3050 |
| Max weight conveyed on the differenal sub, t | 15 | 20 |
| Operaonal life, mes, not less | 10 | |
| Overall dimensions (diameter x length), mm | 73х270 | 89х310 |
| Weight, kg | 4,0 | 6,0 |
* From the boom of the ceramic membrane