Swabbing Operations
Swabbing is a temporary special services process to pull fluid from the well bore through the use of wire rope and cup assembly. Swabbing is a temporary operation to determine whether the well can be made to flow.
During the process of swabbing, a swab on a wireline is used to lower the pressure in the well bore and bring well fluids to the surface when the well does not flow naturally.
A swab is a hollow mandrel fitted with swab cups used for swabbing. A swab cup is a rubber or rubber-like device on a special rod (a swab), which forms a seal between the swab and the wall of the tubing or casing.
If the well does not flow after being swabbed, a pump is installed as a permanent lifting device to bring the oil to the surface.
Swabbing equipment includes a swabbing assembly, lubricator with an oil saver, and shut-off valve on the well, also called a swabbing valve. General precautions during all swabbing operations:
- Conduct swabbing operations during daylight hours.
- Keep all personnel clear of the derrick or within six feet (two meters) of the wellhead during swabbing operations.
- Locate swab tanks at least 100 feet (30 meters) from the well, where location allows.
Knowledge Check Choose the best answer for the question.
6-5. Where should swab tanks be located while conducting swabbing operations on the oil well site?
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