METHOD OF PRESSURE-TESTING OF THREADED JOINTS OF CASING STRINGS IN COURSE OF THEIR LOWERING Russian patent published in 1998 - IPC

FIELD: methods of pressure-testing of casing string threaded joints; may be used in wells of gas underground storages for flow strings of all sizes for determination of tightness of threaded joints of casing strings in the course of their running in wells and for replacement of defective pipes in case of leaking threaded joints. SUBSTANCE: method includes supply of external pressure to threaded joint. Pressure test of threaded joint and its rejection are carried out in the course of lowering the casing string in special chamber KORS having two branches. One branch has throttle and control device with registration of test pressure values. EFFECT: provision of detection and rejection of defective threaded joints in the course of lowering the casing string. 2 dwg