Emmen
Emmen
Celle
Aberdeen
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Category

Snubbing

WELL CONTROL – kill underground blowout

A new well was accidentally drilled into an existing gas production well at a depth of 611m. The accident triggered an underground blow-out in which large quantities of gas were produced from a 3536m deep reservoir into the 611m formation. The drilling rig was severely damaged by the blow-out and the newly drilled hole finally […]

Underbalance Drilling using Snubbing unit

This gas producer well in Poland was drilled overbalance in 2011 to a depth 1528 mAH. To prevent reservoir damage caused by overbalanced drilling fluids the company decided to drill the well further in underbalance mode to a depth of 1858 mAH. Snubbing was identified as the most safe and efficient method to drill underbalance […]

UBD – Live well drilling and completion

During managed pressure drilling (MPD) with a conventional drilling rig into a gas bearing formation severe losses were encountered. Surface pressures up to 180 Bar were recorded. The well was temporarily killed by pumping 250 mT of LCM material and a viscous seal pill and the drilling rig was demobilized. In total 5300 m³ of […]

Straddle recovery on a Live gas well

The well is a gas producer with a deviation of 48º that was completed with 5”completion in 1985. Well integrity problems forced the operator to shut-in the well and to plan a re-completion workover. Reservoir condition was such that killing the well would cause a significant production loss due to formation damage. HWO/Snubbing operation was […]

Safeguarding a blown out well

This was a gas storage well that supplied gas to the German capital, Berlin. A down-hole explosion occured during regular maintenance, which caused the well to blow out. This explosion caused major damage to the completion, casing and well-head. The primary objective was to safeguard the well by changing out the well-head and gaining access […]

Onshore Re-Abandonment

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The well was drilled in 1996 to a depth of 3990m and was plugged with 5 cement plugs in the same year. In the years after surface pressure build up was detected and the decision was made to re-abandon the well. The objective was to find the leak path and to re-abandon this well. Works […]

Offshore Fishing

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The platform was located on an Oil Producing Field in the Mediterranean off the coast of Sicily. The wells were completed in the mid 1980´s to produce heavy 15.5 API oil. Over the course of thirty years the integrity of these wells had suffered, thus a workover campaign utilising HWO was initiated. The platform previously […]

Coil Tubing Recovery

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The platform was located on a Large Gas Producing Field in the Central North Sea. The Wells were beginning to water out and in an attempt to increase production the decision was made to run Coil Tubing Velocity Strings. During the first string installation a runaway occurred which resulted in the shear seals being closed […]

LIVE WELL CONNECTOR

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Four existing multi-lateral horizontal gas wells located in the Southern North Sea were initially completed barefoot but production eventually ceased due to blockage of the production conduit by reservoir solids (sand and rocks). To mitigate this problem, 2-7/8” pre-drilled liner pipe made up in lengths of up to 200m was to be deployed on wireline […]

HPHT UBD

The platform was a HPHT gas condensate producer in the Central North Sea. A Well had been suspended with a shallow cement plug and was to be abandoned. Bellow the cement plug was the possibility of 800 bar. The objective was to rig up a snubbing unit within the derrick of a jack up, then […]
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