SOME ISSUES OF RE-UTILIZATION OF CASING STRINGS, UNUSED WATER WELLS (ON THE EXAMPLE OF SOME COUNTRIES OF THE SOUTH-WESTERN SAHEL)

Abstract

The article discusses some of the issues of recovery and reuse of casing strings of unused wells in tropical countries. The results of experimental-production work to solve the above issue are presented. In particular, it is noted that the consistency of liquefied clay rocks located in the annulus of wells, which in turn depends on the equipment of the columns with drainage pipes, significantly affects the success of the extraction of casing pipes. Optimal schemes for equipping casing strings with smalldiameter drainage pipes and standard sizes of holes were established. Possibilities of applying the results of these works in other regions with similar characteristics are indicated.