| 摘要 |
<p>USE OF PULSED NEUTRON LOGGING TO EVALUATE PERFORATION WASHING : An improved method of locating and measuring voids behind casings of wells in unconsolidated formations comprises first and second logging operations carried out before and after perforation washing respectively to locate voids. The voids may thereafter be filled using conventional gravel packing techniques. In a preferred embodiment, pulsed neutron logging is the logging tool chosen, and a washing fluid having a high neutron absorption cross-section is used.</p> |
