Lubricator Wireline Pressure Control
I. Introduction
Lubricator is a tube which with quick union and can stand high
pressure, it’s used to accommodate
wireline toolstring. Lubricator bottom end is connected with blow
our preventor, upper end is connected
with hydraulic stuffing box and grease injection system. Usually
lubricator length is 8ft, sometimes also
available 4ft and 7ft, it’s decided by the downhole tools length
when operation.
There are two types:
Upper and lower lubricator.Upper lubricator is for accommodate basic toolstring
such as rope socket, stem, jar, etc;
Lower lubricator is for accommodate downhole devices, it’s with
bleed off port. Install the pressure joint
on it and then install the pressure release valve to read the well
pressure and release it.
II. General Technical Parameters
OTIS Quick Union
| Bore | Work Pressure | Service | Connection | Seal Dia. |
| 2.5＂ | 5K 10K | Std H2S | 5＂-4ACME | 3.5＂ |
| 3＂ | 5K | H2S | 5＂-4ACME | 3.5＂ |
| 3＂ | 10K | Std | 5＂-4ACME | 3.5＂ |
| 3＂ | 10K | Std H2S | 5-3/4＂-4ACME | 4＂ |
| 2.5＂ | 15K | H2S | 5-3/4＂-4ACME | 4＂ |
| 4＂ | 5K 10K | Std | 6-1/2＂-4ACME | 4.75＂ |
| 3＂ | 15K | Std H2S | 7-1/2＂-4ACME | 5.5＂ |
| 5＂ | 5K | Std H2S | 8-1/4＂-4ACME | 6.188＂ |
| 4＂ | 10K | Std H2S | 8-3/8＂-4ACME | 5.25＂ |
| 5＂ | 5K 10K | Std H2S | 9＂-4ACME | 6.75＂ |
| 4＂ | 15K | Std H2S | 9-1/2＂-4ACME | 6.25＂ |
| 6.38＂ | 10K | Std H2S | 11-1/2＂-4ACME | 8.25＂ |
BOWEN Quick Union
| Bore | Work Pressure | Service | Connection | Seal Dia. |
| 2.5＂ | 5K 10K | Std H2S | 4-3/4＂-4ACME | 3.75＂ |
| 3＂ | 5K 10K | Std | 4-3/4＂-4ACME | 3.75＂ |
| 3＂ | 5K | H2S | 4-3/4＂-4ACME | 3.75＂ |
| 3＂ | 5K | Std H2S | 5-1/2＂-4ACME×2 | 4.375＂ |
| 3＂ | 10K | Std | 5-1/2＂-4ACME×2 | 4.375＂ |
| 2.5＂ | 15K | Std H2S | 6-5/16＂-4ACME | 4.375＂ |
| 3＂ | 10K | Std H2S | 6-5/16＂-4ACME | 4.375＂ |
| 3＂ | 15K | Std H2S | 7＂-5STUB ACME | 4.375＂ |
| 4＂ | 5K | H2S | 7＂-5STUB ACME | 4.375＂ |
| 4＂ | 10K | H2S | 8-1/4＂-4ACME×2 | 6.0＂ |
III. Structure Features
Lubricator is mainly consist of tube, nut and slips, etc.:
Tube is the main pressure-bearing part to accommodates toolstring
inside, it’s lubricator body part;
Seal ring is installed on the quick union part to ensure the
sealing connection of the lubricators.
Nut and slips are mainly for connection function.
IV. Pressure Test
The lubricator should be tested for compressive strength
periodically, the test pressure is 1.5 times
of the working pressure.
1. Install the test sub and test pipeline.
2. Open the test pump for the pressure test and press the pressure
to test,
holding 15 minutes and fill the test record card.
V. Maintenance
1. Replace the seals after each time usage.
2. Install with the thread protector when in storage.
