a reply to: Flyingclaydisk
Gas lifting is something that is getting popular and here is why.
First, oil companies consider natural gas a waste product, especially where I am because the basin here is really gassy.
If they flare it they pay a burn tax... a flare tax.
If they have a pipeline to get it offsite then they have to pay a line fee to the compressor site.
If they have too much of it and can't get rid of it they have to limit their oil production.
The first 6-10 months of a new well is a LOT of gas that they really have a problem getting rid of.
What I was originally doing was flare gas recovery... I would take some compressors, take the gas out of the treaters and compress it to about 1000
pounds. Then I would run it through a Mechanical Refrigeration Unit or a JT skid, separate the NGL and condensate from the natural gas and send the
rest (C-1 through C-3 or methane, ethane and a bit of propane) to the flare, making the burn 90% or so cleaner.
Meaning they were burning less and cleaner so they paid a whole lot less burn tax, got to get rid of a lot of gas at the same time, I sell the NGL and
condensate and everyone was happy.
Then came gas lifts.
The concept is that you drill a horizontal well and install an outer casing that has mechanical chokes in it.
Inside you run a smaller pipe (tubing) and extend it beyond the casing at the end of the well.
Then you take that gas that you were separating and processing and send the dry gas (the gas that was going to flare anyways) through a compresser
again, back downhole, pressuring up the casing to 800-900 psi. When it is pressured up, the mechanical chokes close, preventing the casing from back
pressuring. Electronic chokes are used between the compressor and the well to regulate the injection rate.. each well produces differently so they
need to be fine tuned for optimal production.
What that does is build up a sphere of pressure at the end of your well. Where does it go?
Up the tubing and out, at about 300 psi.
So you are essentially taking a waste product, using the equipment you already had at the site and increasing production to a few hundred percent over
what a rod lift will do.
Now eventually the well will settle in, there will be less natural gas available, then you put in a rod lift or submersible pump and keep getting oil,
without all the hassle of getting rid of your natural gas.
But for the first 18 months all of your natural gas headaches are taken care of, you are producing enough to pay for your build in 6 months and all
the rest is gravy.
Somewhere in there I get some money too.
So that is the concept of gas lifts.
Hope it was informative.
And not just a sales pitch... I like what I do and get carried away sometimes.
I'm a "green" girl in the oil patch.
edit on 15-6-2019 by Lumenari because: (no reason given)