22 are utilized to collect waste from the wellbore 12 and perforations 52 prior to performing the actual formation test but other purposes may be served by the waste chambers such as drawing unwanted fluids out of the formation 14 for example fluids injected therein during the well drilling process the packer 24 may be used to straddle the formation 14 if another formation therebelow is open to the wellbore 12 a large rathole exists below the formation or if it is desired to inject fluids flowed from the formation 14 into another fluid disposal formation as described in more detail below the packer 24 is shown unset in fig1 as an indication that its use is not necessary in the method 10 but it could be included in the string 18 if desired the perforating gun 26 and associated firing head 28 may be any conventional means of forming an opening from the wellbore 12 to the formation 14 of course as described above the well may be uncased at its intersection with the formation 14 alternatively the formation 14 may be perforated before the assembly 20 is conveyed into the well the formation may be perforated by conveying a perforating gun through the assembly after the.