A bit more context would help, but I guess it's like is says: a single trip compltion is all installed in one trip into the well, a dual trip completion takes tow trips: perhpas the packer and tail pipe installed on pipe, and then the tubing stabbed into the packer? Or it could refer to the shoot & pull way of completing a cased & cemented horizontal well (run guns on pipe, shoot, kill well, pull guns, run completion).
A bit more context would help, but I guess it's like is says: a single trip compltion is all installed in one trip into the well, a dual trip completion takes two trips: perhpas the packer and tail pipe installed on pipe, and then the tubing stabbed into the packer? Or it could refer to the shoot & pull way of completing a cased & cemented horizontal well (run guns on pipe, shoot, kill well, pull guns, run completion).