Hydraulic Workover & Snubbing Services

Applications

hydraulic Workover Services HWO units are a versatile intervention tool and can be used for a variety of applications:

Running & pulling completions, production or kill strings under pressure.
Running & pulling gravel pack completions & ESP (electric submersible pumps).
Under-balanced applications with jointed pipe.
Drilling lateral extensions (including cutting windows for thru-tubing). Drilling cement, bridge plugs & milling.
Unloading wells or sand washing with nitrogen, fluid or foam.
Squeeze cementing.
Fishing for lost wireline tools, coil tubing or drillpipe.
Blowout control.

Features

HWO is a core business line of PSL.
Most experienced HWO provider in the North Sea.
Largest Pool of HWO equipment in the North Sea with 5 HWO units + 3 rig assist snubbing units.
Strongest onshore HWO engineering team for advanced job design.
Two 340,000 lbs pull capacity HWO units. One 460,000 lbs and one 500,000 lbs pull capacity units.
Three rig assist snubbing units one rig floor mounted.
Electric rack and pinion workover unit.

Benefits

Significant cost reduction when compared to drilling rig workovers
Tower units allow coiled tubing and wireline to be rigged up and run quickly, offering substantial time savings between phases of work

Experience

With over 340 separate Hydraulic Workover Operations since 1985, PSL is the most experienced HWO provider in the North Sea.
PSL have both the largest (8 HWO units) and most diverse equipment pool in the North Sea, including three rig assist snubbing units, used primarily for Underbalanced Drilling (UBD) operations.
PSL also have one of the largest and most experienced pool of offshore HWO operators, alongside one of the strongest well engineering teams in the business.

(* Snubbing is the act of putting drillpipe into the wellbore when the blowout preventers (BOPs) are closed and pressure is contained in the well. Snubbing is necessary when a kick is taken, since well kill operations should always be conducted with the drillstring on bottom, and not somewhere up the wellbore. If only the annular BOP has been closed, the drillpipe may be slowly and carefully lowered into the wellbore, and the BOP itself will open slightly to permit the larger diameter tool joints to pass through. If the well has been closed with the use of ram BOPs, the tool joints will not pass by the closed ram element. Hence, while keeping the well closed with either another ram BOP or the annular BOP, the ram must be opened manually, then the pipe lowered until the tool joint is just below the ram, and then closing the ram again. This procedure is repeated whenever a tool joint must pass by a ram BOP. In snubbing operations, the pressure in the wellbore acting on the cross-sectional area of the tubular can exert sufficient force to overcome the weight of the drillstring, so the string must be pushed (or "snubbed") back into the wellbore. In ordinary stripping operations, the pipe falls into the wellbore under its own weight, and no additional downward force or pushing is required. *)

Click below for a relevant download

Hydraulic Workover Services.pdf

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