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Underground Injection Control Branch Guidance No. 5 <br />. ~. • <br />wy5iwyg://35/hup://www.epa.gov/reg5oh2o/uidr5_O5. htm <br />stationary testing, and 3) compazison of logs run before and after the other testing methods aze us <br />Either slug tracking or the stationary tests are adequate tests, but the comparison of logs run befot <br />and after the injection is only supplementary, and its use is in identifying the intervals along the v <br />bore where RA material has adhered to the walls as it exited the well bore. <br />Recommended procedures for the use of the slug tracking method are: <br />1. Inject at the maximum rate used for injection unless i[ is impossible for the tool can be <br />effectively used at that rate. Otherwise inject at the maximum rate at which the winch opera <br />can track the slug; <br />2. Release a slug of RA tracer faz enough above [he base of the casing or perforations to alloy <br />to be logged within [he casing at least once; <br />3. Drop the tool down through the slug and then log upward through the slug; <br />4. Drop [he tool down to within 20 feet below the top of the perforations or base of the casing <br />tubing tailpipe, if [ha[ is lower). Hold the tool a[ that point until the slug reaches it. As Boor <br />the slug is detected, begin to log upwazd so that the logging tool passes the top of perforati~ <br />or the base of the deeper of the casing or tubing just after the slug has passed [he same poir <br />This helps to ensure that any upward movement is detected; <br />5. Drop the tool below the slug, but no more than 50 feet below the perforations/casing/tubing <br />split was observed during the previous logging run, and again log upward; <br />6. Continue making passes to show the upward movement of the slug as long as it is measura <br />7. The procedure (Steps 1 though 6) should be repeated until the highest point to which inject <br />moved upward is identifiable; and <br />8. If any slugs are seen to split, the tracer material remaining after all of the planned testing is <br />done should be ejected just above the casing shoe and the resulting slug followed upwazd a <br />as possible. <br />Recommended procedures for the use of [he stationary method are: <br />Injection should be at the maximum rate used to inject waste. The slug of RA material shot <br />be ejected some distance above the depth a[ which the stationary test will be made in order <br />eliminate electrical effects associated with the ejection which sometimes mask or distort th <br />detection of the downward moving slug. The greater deflection caused by the slug, [he beto <br />However, the length of the ejection should not be over a few seconds to avoid producing a <br />slug. <br />2. With at least two detectors, one above and one below the ejector, recording in time drive, <br />position the logging tool with the lower detector four feet above the top of the perforations <br />the deeper of the base of the casing or tubing. When used with slug tracking, position the u <br />detector about two feet above the highest point reached by the tracked slug; <br />The use of a[ least two detectors has two important advantages: 1) it allows the test to be, it <br />effect, run at two or more depths and may cut the time required to run a test which complet <br />27 of 34 5/28/99 I :09 PM <br />