RE:RE:RE:Another article on Tunisia Discoveries
courtesy a very smart man..............
Folks,
When I was a practising engineer completions are what I did for a living. I just wanted to clarify the situation here so that others may also understand what the well is like right now. Dualex ran 3 1/2" tubing in the hole and unless they bring out a service rig to remove it there will be no testing of separate intervals with packers. The coil tubing unit will be conveyed through the tubing and the acid will be circulated down to the perforations and first washed by to clean the perfs and then squeezed to open up the formation and allow the well to flow freely. Because chalk is actually Calcium Carbonate it reacts very actively with Hydrochloric acid, usually, 15%, but can be as high as 28%. 15% works with the least risk, in my experience, and formation clogging emulsions can sometimes form between the oil, acid and mud clay particles. If there are open fractures the acid will follow them as it follows the path of least resistance. The acid will be accompanied by several additives to prevent emulsion problems. Iron from the tubing can be the worst culprit in promoting the formation of emulsions so it is usually a good idea to pickle the tubing in advance of squeezing the acid into the formation. I am sure that whichever service company Dualex gets to do the work, I suspect it will be Schlumberger, will give them very good advice regarding this treatment. My expectations are high that a successful oilwell will be achieved and that it will flow without artificial lift. My calculations indicate that this size of tubing will allow no more than about 10,000 barrels per day flowing and I hope the well is good enough to support this kind of flow rate. Please do not think that I am predicting this kind of rate, I am not. That is the reason the well is being tested to find this out!