by rockdoc123 » Tue 10 Jan 2017, 13:18:54
$this->bbcode_second_pass_quote('', 'S')audis are referring to what they expect to achieve in the future, I think, not what they can do now.
yes and no. In a SPE paper published some years ago Aramco scientists looked at wettability of key reservoirs in the northernmost part of the Ghawar trend. What they determined was that the ultimate recovery would be ~70% under existing field development plans. At the time the recovery from that portion of the trend was around 50% and apparently it has continued to produce. The announcement by Aramco that they are confident they will achieve 70% recovery from all their fields was made this year. Although it seems to be the first response of folks to accuse the Saudis of lying it is important to remember that they were well out in front of the pack in terms of oilfield management practices. They had the first multi-million cell full field model running on a super computer back when most folks were still using something with way less than a gigabyte of hard drive space. They pioneered the MRC (maximum reservoir contact) wells along with SMART completions and implementation of downhole abandonment of single laterals followed by drilling of new laterals with expandable liners, all of which have gone a long way to improving overall primary recovery. Now they are experimenting with CO2 injection and if you wander around on the ONEPETRO site to look at recent SPE publications there seems to be a lot going on with regards to understanding in excruciating detail how recovery can be improved.
So yes they are suggesting what they will eventually get but I believe that is under the current technology they are already implementing. This is a lot different than say someone who is developing heavy oil by steam flood suggesting they will eventually have technology that can improve recovery to 30%.
And something that needs also to be considered is that when we talk about ultimate recovery we are talking about ultimate economically recoverable. There are some fields currently producing that could have their recovery improved by implementation of existing technologies, the problem is the economics don't work, the upfront investment is too high for returns that are generally realized at the end of the production curve, time value of money being your worst enemy.