09年巴黎会议提交的BW文件.pdf

15 thEuropean Symposium on Improved Oil Recovery — Paris, France 27 –29 April 2009 Bright Water ? Sweep Improvement From The Lab To The Field Harry Frampton and Paul Denyer, BP Exploration and Production Technology Group; Danielle Ohms and Michael Husband, BP Exploration, Alaska Inc and Jorge Mustoni, Pan American Energy Bright Water? is a Nalco trademark for water flood sweep improvement products Abstract In the early 1990’s BP pioneered the use of reservoir triggers for in -depth placement of chemical treatments to improve water flood sweep efficiency. It was recognized that the mo st difficult cases involved injection water “thief zones” that were in contact with lower permeability zones of high remaining oil saturation. In such cases near well -bore treatments were ineffective and an in - depth block appeared to be required to redis tribute the pressures in the reservoir and mobilize the remaining oil. The lessons learned from this work suggested that the most effective treatments would employ ponent materials placed deep in the formation. A particulate material was envisa ged that was likened to popcorn. It would move freely through the matrix rock until a reservoir trigger caused the particles to increase in size to block thief zone pore throats. The context and development of this new Bright Water? technology is detailed from inception in 1997, through development with the MoBPTeCh consortium, to the proof of concept laboratory test in 2000 and the technical field trial in 2001. The nature of the particulate reagent and the effect of the thermally sensitive crosslinks it contains are reviewed. BP has injected five sets mercial trials and started the widespread deployment of the technology. parison of 19 well pleted to August 2008 is presented with notes on their character, treatment and responses. These were injected in seven fields with a variety of environments where effects of applied variables such as treatment size, field