Flow rates.22 Jan 2025 00:31
There is now a proposition here that PRD management are complete fools for buying oil wells producing only a few barrels per day. I have been mocked for suggesting a figure of 250 bopd is attainable. These wells, when originally drilled, did produce at much higher rates. As I explained yesterday, oil can contain long-chain paraffins. These are large molecules that are liquid at the temperatures and pressures found in deep reservoir formations. Once the oil starts to rise up the borehole, pressure and temperature reduce, and the paraffins start to crystallise and solidify into waxes that drastically increase the viscosity of the oil, leading to a reduction in flow rates, then complete blockage.
Chemical dewaxing techniques, that dissolve the wax by heat and help bring the oil to surface by nitrogen lift, have been successfully used since the 90's. There have been a number of improvements to this method, PRD are using the latest. Please note, 'improvement' means 'better than before'. This improved method is new to Trinidad, but has been in extensive use in KSA, as I have already said. As GRH has kindly reminded us, the Saudis possibly know a little more than the anonymous keyboard warriors here who have neither qualifications nor experience. Each well, or even horizon, requires an optimal formulation. This is determined by analysing the oil sample in the supplier's lab, then sending out the correct dewaxing formulation. I suspect this first go at Trinidad oil has taken longer to process than planned, maybe an iterative process was required to optimise the formulation. There is NO indication whatsoever that it has been tried by PRD and failed. This process has a long and successful history of use by many oil majors, I see no reason why it should not work in Trinidad.
So the treatment will work - what will be the result?
Those who have done some research will know that Snowcap-1 production tailed off quite quickly due to waxing. They will also know that initial production was 1450 bopd. Yes, ONE THOUSAND FOUR HUNDRED AND FIFTY. This stabilised to 578 bopd plus 4.5mmcf gas/d over a 6-day test. Oil was API 37Β° - this is very light, easy to process, and secures a premium price.
https://www.ogj.com/home/article/17267191/trinidad-gets-rare-onshore-light-oil-discovery
Bonasse & Cory-Moruga have oil with very similar characteristics. We know that C-M is still at virgin field pressure. I see no reason why any of these previously-producing wells cannot be worked over, dewaxed and restored to full production. Perhaps those on here professing superior knowledge can provide us with their detailed reasoning as to why this should not be the case. If you can't do this, how about stopping making fools of yourselves.