Pump-Down Visualization (PDV) Software / Mono-ConductorTension Device (MCTD)

Knowing how much pressure to apply or how fast to run out cable requires knowing the tension at the cable head and the well trajectory during the  pump-down. Unfortunately, until now, there was no way to tell the precise position of guns in such torturous well paths. As a result, crews could accidentally take actions that could cause guns to disconnect from the cable, a condition known as “pump-off.”

Halliburton introduces two new technologies that help avoid such problems. The Mono-Conductor Tension Device (MCTD) and Pump-Down Visualization (PDV) software to enhance real-time communication and understanding of what occurs during a pump-down run.Image

The MCTD shows tension on the cable at the gun connection in real time. Studies show that surface tension measurements can be slow to respond or inaccurate compared to downhole tension. The MCTD gives crews a way to keep tension on the cable within safe limits.

Halliburton Pump-Down Visualization software displays the position of the guns in relation to the well directional survey supplied by the operator. This enables crews to monitor gun-string transport throughout the pump-down and correlate it with tension readings at the top of the gun string. The combination shows real-time movement of the gun string, helps operators understand the reasons for tension or pressure changes, and react appropriately to help avoid pump-off.

CHALLENGE SOLUTION

Understanding what’s happening downhole

In complex horizontal wells, crews may not understand exactly where guns are. For instance on an upslope, guns could slide back over the cable. When firing the guns, if the guns are across the cable, the cable could be damaged or severed, requiring an expensive fishing operation.

PDV and MCTD

Halliburton’s unique Pump-Down Visualization (PDV)  software and Mono-Conductor Cable Tension Device (MCTD) help pinpoint the location of guns in real time over a map of the well. This enables the crew to apply the right strategy/pressure at the right time to help avoid problems.

Reacting fast enough to avoid disaster

When guns crest a ridge, they may begin to run away  downhole.
If crews do not adjust pumping rates and line speed quickly, pump-off could occur. Again, this would require expensive fishing to remedy, and delay fracturing and production.

Technology allows crews to anticipate

The combination of Halliburton’s PDV software and MCTD enables crews to see the location of guns in the well at all times. Thus, when they begin cresting a ridge, they can begin running out line faster to help reduce the possibility of pump-off, delays and unanticipated expenses.

Planning the next job

Before PDV software and the MCTD, planning the next stage or next job was impossible because crews were “flying blind.” They knew what happened on the last stage, but did not know conditions that may have contributed to problems, so they could not correlate run issues to well conditions.

Accurate stage-to-stage comparisons, post-job report

PDV software and the MCTD correlate pump rate, treating pressure, barrels of fluid pumped per minute, gun string depth, cable speed and tension over time into easy-to-read graphics, overlaid on a well map. This helps crews compare  stages, prepare post-job reports, and plan the next job.

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Summary How Synergy saved time and increased proppant Nov 2014
Summary New technology repeatedly provided incident-free perforating in wells with high risk of pump-off Jan 2014
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Summary Mono-Conductor Tension Device Oct 2013
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