Page 226 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2
P. 226

Formation Evaluation   195




                                                       CATHODE RAY UNm






































                             3' RECEIVER


                             5' RECEIVER





                  Figure 5-11 8.  Transmitter-receiver arrangement and surface equipment for
                  cement bond log-variable density log combination [220].


                                   attenuation in zone of  interest (db/ft )
                    bond index =                                                (5-121)
                                attenuation in a well cemented section(db/ft)
                    Bond index gives a relative way  to determine bond quality through any given
                  section  of pipe.  The  minimum  value  of  bond  index  necessary  for  a  good
                  hydraulic seal varies from  region  to  region,  and  depends on  hole  conditions
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