Well Site Troubleshooting
Wellhead Troubleshooting – Tagging Bottom
Rapidly opening the wellhead valves on a high pressure well flowing into a low pressure collection system is a good way to ruin a well when the following two criteria are met:
• The wellhead choke is large.
• The well has been shut-in for a while.
The surge of gas flow resulting from following this procedure may, [...]
Well Site – Soap Sticks
Equation 5 implies that the lower the density of the liquid accumulating in the tubing, the lower the entrainment velocity. This means that less gas flow is required to keep a well unloaded of liquids, when the liquid density is reduced. Addition of soap sticks to a well is a simple method to reduce the [...]
4Oct2009 | admin | Comments Off | ContinuedWell Site – Problem With Use Of Intermitters
The valve trim on the intermitter should be at least twice the diameter of the choke. When the intermitter valve opens it should not restrict gas flow from the well. Unfortunately, if the wellhead pressure builds to an excessive level, the sudden surge in gas flow when the intermitter opens may have two detrimental effects:
1. [...]
4Oct2009 | admin | Comments Off | ContinuedWell Site – Keeping Wells Unloaded
Mr. Howlaway eyed my equations suspiciously, “I can see that you have developed a method to predict the combination of the gas production rate and wellhead pressure necessary to keep my wells from loading -up with liquid. But suppose the production rate that the reservoir can support is too low, or the wellhead pressure is [...]
3Oct2009 | admin | Comments Off | ContinuedWell Site – Sustaining Entrainment Velocity
When I first started troubleshooting partially depleted natural gas wells, I often wondered why so many of the hundred odd wells I visited were averaging 200-300 MSCFD. I had expected a more linear
distribution between the minimum gas production per well (20 MSCFD). Actually, 30 to 40% of the wells I observed clustered around an average [...]
Well Site – Entrainment Velocity
A well that produces 100,000 SCFD of gas as a minimum, but periodically reaches a peak production rate of 300,000 SCFD once a day, is continuously loading and unloading liquids. The sequence of
events are:
• The velocity of gas flowing up through the tubing is insufficient to entrain liquids out of the tubing to the surface.
• [...]
Well Site – Liquid Loading
Although we have been talking about wellhead pressure (both shut-in and flowing tube), the wellhead pressure is just an indirect indication of the really important parameter-that is, the bottom hole pressure. It is the pressure inside the casing at the level of the perforations that determines gas flow. By lowering a pressure sensing instrument suspended [...]
3Oct2009 | admin | Comments Off | Continued