WHAT IS Hydraulic Work Over (HWO) AT OIL AND
GAS WELLS?
Hydraulic Workover is a versatile, cost-saving and safe
technique for repair- and remedial work on all types of wells.
Hydraulic Workover may include:
•
Completing or re-completing wells
•
Installation of ESP pumps
•
Tubing conveyed perforations
•
Installation of liners and sand screens
•
Repair of down hole safety valves (scsssv)
•
Drilling over small distances
•
Fishing/ (production) Packer Milling operations
•
Casing milling, milling bridge plugs, etc.
•
Casing repairs
•
Well Clean outs / Cleaning, Stimulations
•
Cementing
•
Abandonments
Why HWO?
Hydraulic Workover is a well intervention technique which can
be used to install or remove tubular in- or out of dead wells. "Dead" well means that the well has
zero surface pressure and has a heavy fluid or mud in the wellbore, or is not
capable of sustaining natural flow.
Advantages of Hydraulic
Workover
A HWO unit can cover the same working envelope as a workover
rig but has advantages over conventional rigs or hoists for certain
applications, such as:
•
Small and flexible footprint
•
Small environmental impact
•
It is quickly and easily mobilized to offshore
platforms
•
It is quickly and easily mobilized to remote
land wells
•
Costs efficient
•
Perfect control over the workstring (tubular)
•
Custom Rig-up configuration / Modular approach
Hydraulic Power
The HWO unit (Hydraulic Workover Unit) utilizes hydraulic
cylinders to lift the tubular in- or out of the well. The use of hydraulic cylinders allows perfect
control over tubular movements and eliminates the use of a large mast
construction which is present on conventional drilling rigs.
Hydraulic cylinders can generate large pull and push forces and
give the HWO unit a small footprint and layout. These properties are especially
beneficial for offshore operations where space is limited and where weather
conditions can be harsh. In general is
the running speed of a HWO unit lower than that of conventional workover rig.
