Oilfield Forum

I am having an argument over our kill procedure, We kill many different wells with different pressures, we have one weight of kill fluid to kill these with, of course you don't want to overkill a well and lose this fluid to the reservoir so we must limit what we pump, I have seen a few different ways of doing this. We all agree on rolling the hole and getting proper shut in pressures. I have then seen guys pump 100 bbls of fresh water to formation and get another shut in and use this for thier kill weight and bullhead their tbg volume and their annular volume. This seems to work but I feel it a lot of unnecessary work. I have seen guys just bull head the annular and tbg volume and go that way which sometimes does and sometimes doesn't, I myself have never had luck doing it this way. I have been spotting my plugs on bottom and have had the best luck by doing it this way. The well stays dead and if it does decide to come on I have plenty enough time to get shut down. I have a complaint about when rolling my mud out by doing it this way that I create a larger force on formation and I lose fluid in the reservoir. I was honestly told that there was no way I could spot it on bottom (of course this is above the zone) that there is such a down force that I can't get fluid around. I explained the process of using a choke for back pressure and they still said I lose fluid, even though I always recover every barrel I pump. I understand that on average when recovering my fluid I am increasing our hydrostatic pressure on the reservoir, but it is at most 350 psi, which is way less than frac gradient. It was suggested that if I would rather spot the mud I need to pull up hole and spot the mud on top of the well bore, so if I need 1500' of fluid I need to pull up to 1600', I feel this is too close for comfort when the well is sitting @ 850 psi shut in. Also sometimes your unable to pull up to kill it. Besides If it starts flowing the mud is immediately coming back. I was wondering what everyone's thoughts were about this. I also was curious as to see if anyone knows how to calculate the compression pressure that will be created when you bullhead besides the 100 bbls H2O method?